HCS320 [MICROCHIP]
KEELOQ Code Hopping Encoder; KEELOQ跳码编码器型号: | HCS320 |
厂家: | MICROCHIP |
描述: | KEELOQ Code Hopping Encoder |
文件: | 总32页 (文件大小:417K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
HCS320
®
KEELOQ Code Hopping Encoder
FEATURES
Security
DESCRIPTION
The HCS320 from Microchip Technology Inc. is a code
hopping encoder designed for secure Remote Keyless
Entry (RKE) systems. The HCS320 utilizes the code
hopping technology which incorporates high security, a
small package outline, and low cost, to make this
device a perfect solution for unidirectional remote key-
less entry systems and access control systems.
• Programmable 28-bit serial number
• Programmable 64-bit encryption key
• Each transmission is unique
• 66-bit transmission code length
• 32-bit hopping code
• 34-bit fixed code (28-bit serial number,
4-bit function code, 2-bit status)
PACKAGE TYPES
• Encryption keys are read protected
PDIP, SOIC
8
7
6
5
VDD
LED
PWM
VSS
S0
1
2
3
4
Operating
S1
• 3.5V - 13.0V operation
• Shift key and three inputs
S2
• 16 functions available
SHIFT
• Selectable baud rate
• Automatic code word completion
• Battery low signal transmitted to receiver
• Battery low indication on LED
• Non-volatile synchronization data
HCS320 BLOCK DIAGRAM
Oscillator
Power
latching
and
Controller
RESET circuit
switching
Other
LED
LED driver
• Easy-to-use programming interface
• On-chip EEPROM
• On-chip oscillator and timing components
• Button inputs have internal pull-down resistors
• Current limiting on LED output
• Low external component cost
EEPROM
Encoder
PWM
32-bit shift register
Button input port
Typical Applications
VSS
VDD
The HCS320 is ideal for Remote Keyless Entry (RKE)
applications. These applications include:
• Automotive RKE systems
• Automotive alarm systems
• Automotive immobilizers
• Gate and garage door openers
• Identity tokens
S2
SHIFT
S1 S0
The HCS320 combines a 32-bit hopping code gener-
ated by a nonlinear encryption algorithm, with a 28-bit
serial number and six status bits to create a 66-bit
transmission stream. The length of the transmission
eliminates the threat of code scanning and the code
hopping mechanism makes each transmission unique,
thus rendering code capture and resend (code grab-
bing) schemes useless.
• Burglar alarm systems
2001 Microchip Technology Inc.
DS41097C-page 1
HCS320
The crypt key, serial number and configuration data are
stored in an EEPROM array which is not accessible via
any external connection. The EEPROM data is pro-
grammable but read-protected. The data can be veri-
fied only after an automatic erase and programming
operation. This protects against attempts to gain
access to keys or manipulate synchronization values.
The HCS320 provides an easy-to-use serial interface
for programming the necessary keys, system parame-
ters and configuration data.
• Learn – Learning involves the receiver calculating
the transmitter’s appropriate crypt key, decrypting
the received hopping code and storing the serial
number, synchronization counter value and crypt
key in EEPROM. The KEELOQ product family facil-
itates several learning strategies to be imple-
mented on the decoder. The following are
examples of what can be done.
- Simple Learning
The receiver uses a fixed crypt key, common
to all components of all systems by the same
manufacturer, to decrypt the received code
word’s encrypted portion.
1.0
SYSTEM OVERVIEW
Key Terms
- Normal Learning
The receiver uses information transmitted
during normal operation to derive the crypt
key and decrypt the received code word’s
encrypted portion.
The following is a list of key terms used throughout this
data sheet. For additional information on KEELOQ and
Code Hopping, refer to Technical Brief 3 (TB003).
• RKE - Remote Keyless Entry
- Secure Learn
• Button Status - Indicates what button input(s)
activated the transmission. Encompasses the 4
button status bits S3, S2, S1 and S0 (Figure 4-2).
The transmitter is activated through a special
button combination to transmit a stored 60-bit
seed value used to generate the transmitter’s
crypt key. The receiver uses this seed value
to derive the same crypt key and decrypt the
received code word’s encrypted portion.
• Code Hopping - A method by which a code,
viewed externally to the system, appears to
change unpredictably each time it is transmitted.
• Code word - A block of data that is repeatedly
transmitted upon button activation (Figure 4-1).
• Manufacturer’s code – A unique and secret 64-
bit number used to generate unique encoder crypt
keys. Each encoder is programmed with a crypt
key that is a function of the manufacturer’s code.
Each decoder is programmed with the manufac-
turer code itself.
• Transmission - A data stream consisting of
repeating code words (Figure 8-2).
• Crypt key - A unique and secret 64-bit number
used to encrypt and decrypt data. In a symmetri-
cal block cipher such as the KEELOQ algorithm,
the encryption and decryption keys are equal and
will therefore be referred to generally as the crypt
key.
The HCS320 code hopping encoder is designed specif-
ically for keyless entry systems; primarily vehicles and
home garage door openers. The encoder portion of a
keyless entry system is integrated into a transmitter,
carried by the user and operated to gain access to a
vehicle or restricted area. The HCS320 is meant to be
a cost-effective yet secure solution to such systems,
requiring very few external components (Figure 2-1).
• Encoder - A device that generates and encodes
data.
• Encryption Algorithm - A recipe whereby data is
scrambled using a crypt key. The data can only be
interpreted by the respective decryption algorithm
using the same crypt key.
Most low-end keyless entry transmitters are given a
fixed identification code that is transmitted every time a
button is pushed. The number of unique identification
codes in a low-end system is usually a relatively small
number. These shortcomings provide an opportunity
for a sophisticated thief to create a device that ‘grabs’
a transmission and retransmits it later, or a device that
quickly ‘scans’ all possible identification codes until the
correct one is found.
• Decoder - A device that decodes data received
from an encoder.
• Decryption algorithm - A recipe whereby data
scrambled by an encryption algorithm can be
unscrambled using the same crypt key.
The HCS320 on the other hand, employs the KEELOQ
code hopping technology coupled with a transmission
length of 66 bits to virtually eliminate the use of code
‘grabbing’ or code ‘scanning’. The high security level of
the HCS320 is based on the patented KEELOQ technol-
ogy. A block cipher based on a block length of 32 bits
and a key length of 64 bits is used. The algorithm
obscures the information in such a way that even if the
transmission information (before coding) differs by only
one bit from that of the previous transmission, the next
DS41097C-page 2
2001 Microchip Technology Inc.
HCS320
coded transmission will be completely different. Statis-
tically, if only one bit in the 32-bit string of information
changes, greater than 50 percent of the coded trans-
mission bits will change.
The crypt key generation typically inputs the transmitter
serial number and 64-bit manufacturer’s code into the
key generation algorithm (Figure 1-1). The manufac-
turer’s code is chosen by the system manufacturer and
must be carefully controlled as it is a pivotal part of the
overall system security.
As indicated in the block diagram on page one, the
HCS320 has a small EEPROM array which must be
loaded with several parameters before use; most often
programmed by the manufacturer at the time of produc-
tion. The most important of these are:
• A 28-bit serial number, typically unique for every
encoder
• A crypt key
• An initial 16-bit synchronization value
• A 16-bit configuration value
FIGURE 1-1:
CREATION AND STORAGE OF CRYPT KEY DURING PRODUCTION
Production
Programmer
HCS320
Transmitter
Serial Number
EEPROM Array
Serial Number
Crypt Key
Sync Counter
.
Key
Crypt
Key
.
.
Manufacturer’s
Code
Generation
Algorithm
The 16-bit synchronization counter is the basis behind
the transmitted code word changing for each transmis-
sion; it increments each time a button is pressed. Due
to the code hopping algorithm’s complexity, each incre-
ment of the synchronization value results in greater
than 50% of the bits changing in the transmitted code
word.
A transmitter must first be ‘learned’ by the receiver
before its use is allowed in the system. Learning
includes calculating the transmitter’s appropriate crypt
key, decrypting the received hopping code and storing
the serial number, synchronization counter value and
crypt key in EEPROM.
In normal operation, each received message of valid
format is evaluated. The serial number is used to deter-
mine if it is from a learned transmitter. If from a learned
transmitter, the message is decrypted and the synchro-
nization counter is verified. Finally, the button status is
checked to see what operation is requested. Figure 1-
3 shows the relationship between some of the values
stored by the receiver and the values received from the
transmitter.
Figure 1-2 shows how the key values in EEPROM are
used in the encoder. Once the encoder detects a button
press, it reads the button inputs and updates the syn-
chronization counter. The synchronization counter and
crypt key are input to the encryption algorithm and the
output is 32 bits of encrypted information. This data will
change with every button press, its value appearing
externally to ‘randomly hop around’, hence it is referred
to as the hopping portion of the code word. The 32-bit
hopping code is combined with the button information
and serial number to form the code word transmitted to
the receiver. The code word format is explained in
greater detail in Section 4.0.
A receiver may use any type of controller as a decoder,
but it is typically a microcontroller with compatible firm-
ware that allows the decoder to operate in conjunction
with an HCS320 based transmitter. Section 7.0
provides detail on integrating the HCS320 into a sys-
tem.
2001 Microchip Technology Inc.
DS41097C-page 3
HCS320
FIGURE 1-2:
BUILDING THE TRANSMITTED CODE WORD (ENCODER)
EEPROM Array
Crypt Key
KEELOQ
Encryption
Algorithm
Sync Counter
Serial Number
Button Press
Serial Number
Information
32 Bits
Encrypted Data
Transmitted Information
FIGURE 1-3:
BASIC OPERATION OF RECEIVER (DECODER)
1
Received Information
EEPROM Array
32 Bits of
Encrypted Data
Button Press
Information
Manufacturer Code
Serial Number
Check for
Match
Serial Number
2
Sync Counter
Crypt Key
3
KEELOQ
Decryption
Algorithm
Decrypted
Synchronization
Counter
Check for
Match
4
Perform Function
Indicated by
5
button press
NOTE: Circled numbers indicate the order of execution.
DS41097C-page 4
2001 Microchip Technology Inc.
HCS320
TABLE 2-1:
PIN DESCRIPTIONS
Description
Switch input 0
2.0
DEVICE OPERATION
As shown in the typical application circuits (Figure 2-1),
the HCS320 is a simple device to use. It requires only
the addition of buttons and RF circuitry for use as the
transmitter in your security application. A description of
each pin is described in Table 2-1.
Pin
Number
Name
S0
S1
S2
1
2
3
Switch input 1
Switch input 2/Clock pin when in
Programming mode
FIGURE 2-1:
TYPICAL CIRCUITS
SHIFT
VSS
4
5
6
Switch input for Shift
Ground reference
+12V
R(2)
PWM
Pulse Width Modulation (PWM)
output pin / Data pin for
Programming mode
LED
VDD
7
8
Cathode connection for LED
Positive supply voltage
B0
B1
S0
VDD
LED
PWM
VSS
S1
Tx out
S2
The HCS320 will wake-up upon detecting a button
press and delay approximately 10 ms for button
debounce (Figure 2-2). The synchronization counter,
discrimination value and button information will be
encrypted to form the hopping code. The hopping code
portion will change every transmission, even if the
same button is pushed again. A code word that has
been transmitted will not repeat for more than 64K
transmissions. This provides more than 18 years of use
before a code is repeated; based on 10 operations per
day. Overflow information sent from the encoder can be
used to extend the number of unique transmissions to
more than 192K.
SHIFT
2 button remote control
+12V
R(2)
SHIFT B3 B2 B1 B0
S0
VDD
LED
PWM
VSS
S1
Tx out
S2
SHIFT
If in the transmit process it is detected that a new but-
ton(s) has been pressed, a RESET will immediately
occur and the current code word will not be completed.
Please note that buttons removed will not have any
effect on the code word unless no buttons remain
pressed; in which case the code word will be completed
and the power-down will occur.
5 button remote control(1)
Note 1: The full 16 function codes are
implemented using the shift button.
2: Resistor R is recommended for current
limiting.
2001 Microchip Technology Inc.
DS41097C-page 5
HCS320
FIGURE 2-2:
ENCODER OPERATION
3.0
EEPROM MEMORY
ORGANIZATION
Power-Up
(Button pressed) Set TX:= OFF
The HCS320 contains 192 bits (12 x 16-bit words) of
EEPROM memory (Table 3-1). This EEPROM array is
used to store the encryption key information,
synchronization value, etc. Further descriptions of the
memory array is given in the following sections.
RESET and Debounce Delay
(10 ms)
Transmit
Yes
Button Pressed?
TABLE 3-1:
EEPROM MEMORY MAP
No
WORD
ADDRESS
Increment Shift Level
Set TX:=ON
MNEMONIC
DESCRIPTION
0
1
2
3
4
KEY_0
64-bit encryption key
(word 0) LSb’s
Stop Transmit
No
KEY_1
KEY_2
KEY_3
SYNC
64-bit encryption key
(word 1)
Shift
Button Pressed?
64-bit encryption key
(word 2)
Yes
Yes
64-bit encryption key
(word 3) MSb’s
TX=ON?
16-bit synchronization
value
Yes
Update Sync Info
5
6
RESERVED Set to 0000H
SER_0 Device Serial Number
(word 0) LSb’s
Encrypt With
Crypt Key
No
7
SER_1(Note) Device Serial Number
(word 1) MSb’s
Load Transmit Register
Transmit
8
9
—
—
Not used
Not used
10
11
RESERVED Set to 0000H
CONFIG Configuration Word
Buttons
Added?
Note: The MSB of the serial number contains a
bit used to select the Auto-shutoff timer.
No
No
3.1
KEY_0 - KEY_3 (64-Bit Crypt Key)
All
Buttons
Released?
The 64-bit crypt key is used to create the encrypted
message transmitted to the receiver. This key is calcu-
lated and programmed during production using a key
generation algorithm. The key generation algorithm
may be different from the KEELOQ algorithm. Inputs to
the key generation algorithm are typically the transmit-
ter’s serial number and the 64-bit manufacturer’s code.
While the key generation algorithm supplied from
Microchip is the typical method used, a user may elect
to create their own method of key generation. This may
be done providing that the decoder is programmed with
the same means of creating the key for
decryption purposes.
Yes
TX=ON?
Yes
Complete Code
Word Transmission
No
Stop
DS41097C-page 6
2001 Microchip Technology Inc.
HCS320
3.2
SYNC (Synchronization Counter)
3.5
CONFIG (Configuration Word)
This is the 16-bit synchronization value that is used to
create the hopping code for transmission. This value
will be changed after every transmission.
The Configuration Word is a 16-bit word stored in
EEPROM array that is used by the device to store infor-
mation used during the encryption process, as well as
the status of option configurations. The following sec-
tions further explain these bits.
3.3
Reserved
Must be initialized to 0000H.
TABLE 3-2:
Bit Number
CONFIGURATION WORD
Bit Description
3.4
SER_0, SER_1
(Encoder Serial Number)
0
1
Discrimination Bit 0
Discrimination Bit 1
Discrimination Bit 2
Discrimination Bit 3
Discrimination Bit 4
Discrimination Bit 5
Discrimination Bit 6
Discrimination Bit 7
Discrimination Bit 8
Discrimination Bit 9
Overflow Bit 0 (OVR0)
Overflow Bit 1 (OVR1)
SER_0 and SER_1 are the lower and upper words of
the device serial number, respectively. Although there
are 32 bits allocated for the serial number, only the
lower order 28 bits are transmitted. The serial number
is meant to be unique for every transmitter. The Most
Significant bit of the serial number (Bit 31) is used to
turn the Auto-shutoff timer on or off.
2
3
4
5
6
7
3.4.1
AUTO-SHUTOFF TIMER ENABLE
8
The Most Significant bit of the serial number (Bit 31) is
used to turn the Auto-shutoff timer on or off. This timer
prevents the transmitter from draining the battery
should a button get stuck in the on position for a long
period of time. The time period is approximately
25 seconds, after which the device will go to the Time-
out mode. When in the Time-out mode, the device will
stop transmitting, although since some circuits within
the device are still active, the current draw within the
Shutoff mode will be more than Standby mode. If the
Most Significant bit in the serial number is a one, then
the Auto-shutoff timer is enabled, and a zero in the
Most Significant bit will disable the timer. The length of
the timer is not selectable.
9
10
11
12
Low Voltage Trip Point Select
(VLOW SEL)
13
14
15
Baud rate Select Bit 0 (BSL0)
Baud rate Select Bit 1 (BSL1)
Reserved, set to 0
3.5.1
DISCRIMINATION VALUE
(DISC0 TO DISC9)
The discrimination value aids the post-decryption
check on the decoder end. It may be any value, but in
a typical system it will be programmed as the 10 Least
Significant bits of the serial number. Values other than
this must be separately stored by the receiver when a
transmitter is learned. The discrimination bits are part
of the information that form the encrypted portion of the
transmission (Figure 4-2). After the receiver has
decrypted a transmission, the discrimination bits are
checked against the receiver’s stored value to verify
that the decryption process was valid. If the discrimina-
tion value was programmed as the 10 LSb’s of the
serial number then it may merely be compared to the
respective bits of the received serial number; saving
EEPROM space.
3.5.2
OVERFLOW BITS (OVR0, OVR1)
The overflow bits are used to extend the number of
possible synchronization values. The synchronization
counter is 16 bits in length, yielding 65,536 values
before the cycle repeats. Under typical use of
10 operations a day, this will provide nearly 18 years of
use before a repeated value will be used. Should the
system designer conclude that is not adequate, then
the overflow bits can be utilized to extend the number
2001 Microchip Technology Inc.
DS41097C-page 7
HCS320
of unique values. This can be done by programming
OVR0 and OVR1 to 1s at the time of production. The
encoder will automatically clear OVR0 the first time that
the synchronization value wraps from 0xFFFF to
0x0000 and clear OVR1 the second time the counter
wraps. Once cleared, OVR0 and OVR1 cannot be set
again, thereby creating a permanent record of the
counter overflow. This prevents fast cycling of 64K
counter. If the decoder system is programmed to track
the overflow bits, then the effective number of unique
synchronization values can be extended to 196,608.
3.5.4
LOW VOLTAGE TRIP POINT
SELECT
The low voltage trip point select bit is used to tell the
HCS320 what VDD level is being used. This information
will be used by the device to determine when to send
the voltage low signal to the receiver. When this bit is
set to a one, the VDD level is assumed to be operating
from a 9.0 volt or 12.0 volt VDD level. If the bit is set low,
then the VDD level is assumed to be 6.0 volts. Refer to
Figure 3-1 for voltage trip point.
3.5.3
BAUD RATE SELECT BITS (BSL0,
BSL1)
FIGURE 3-1:
VOLTAGE TRIP POINTS
BY CHARACTERIZATION)
BSL0 and BSL1 select the speed of transmission and
the code word blanking. Table 3-3 shows how the bits
are used to select the different baud rates and
Section 5.6 provides detailed explanation in code word
blanking.
Volts (V)
5.5
VLOW
VLOW sel = 0
5.0
Max
Min
4.5
4.0
TABLE 3-3:
BSL1 BSL0
BAUD RATE SELECT
3.5
3.0
Basic Pulse
Element
Code Words
Transmitted
2.5
0
0
1
1
0
1
0
1
400 µs
200 µs
100 µs
100 µs
All
1 out of 2
1 out of 2
1 out of 4
9.0
8.5
8.0
7.5
7.0
VLOW sel = 1
Max
Min
-40 -20
0
20 40 60 80 100
Temp (C)
DS41097C-page 8
2001 Microchip Technology Inc.
HCS320
4.2
Code Word Organization
4.0
4.1
TRANSMITTED WORD
Code Word Format
The HCS320 transmits a 66-bit code word when a
button is pressed. The 66-bit word is constructed from
a Fixed Code portion and an Encrypted Code portion
(Figure 4-2).
The HCS320 code word is made up of several parts
(Figure 4-1). Each code word contains a 50% duty
cycle preamble, a header, 32 bits of encrypted data and
34 bits of fixed data followed by a guard period before
another code word can begin. Refer to Table 8-3 for
code word timing.
The 32 bits of Encrypted Data are generated from 4
button bits, 12 discrimination bits and the 16-bit sync
value. The encrypted portion alone provides up to four
billion changing code combinations.
The 34 bits of Fixed Code Data are made up of 2 sta-
tus bits, 4 button bits and the 28-bit serial number. The
fixed and encrypted sections combined increase the
number of code combinations to 7.38 x 1019
.
FIGURE 4-1:
CODE WORD FORMAT
TE TE
TE
LOGIC ‘0’
LOGIC ‘1’
Bit
Period
50% Duty Cycle
Preamble
TP
Encrypted Portion
of Transmission
Fixed Portion of
Transmission
TFIX
Guard
Time
TG
Header
TH
THOP
FIGURE 4-2:
CODE WORD ORGANIZATION
34 bits of Fixed Portion
32 bits of Encrypted Portion
Repeat VLOW
(1-bit) (1-bit)
Function
Code
Serial Number
(28 bits)
Function
Code
OVR
(2 bits) (10 bits)
DISC
Sync Counter
(16 bits)
(4-bit)
(4-bit)
MSb
LSb
66 Data bits
Transmitted
LSb first.
2001 Microchip Technology Inc.
DS41097C-page 9
HCS320
The button code will be the S0, S1 value at the falling
edge of S2. The timing of the PWM data string is con-
trolled by supplying a clock on S2 and should not
exceed 20 kHz. The code word is the same as in PWM
mode with 16 reserved bits at the end of the word. The
reserved bits can be ignored. When in Synchronous
Transmission mode S2 should not be toggled until all
internal processing has been completed as shown in
Figure 4-4.
4.3
Synchronous Transmission Mode
Synchronous Transmission mode can be used to clock
the code word out using an external clock.
To enter Synchronous Transmission mode, the Pro-
gramming mode start-up sequence must be executed
as shown in Figure 4-3. If either S1 or S0 is set on the
falling edge of S2, the device enters Synchronous
Transmission mode. In this mode, it functions as a nor-
mal transmitter, with the exception that the timing of the
PWM data string is controlled externally and 16 extra
bits are transmitted at the end with the code word.
FIGURE 4-3:
SYNCHRONOUS TRANSMISSION MODE
TPS
TPH2
TPH1
t = 50ms
Preamble
Header
Data
PWM
S2
S[1:0]
“01,10,11”
FIGURE 4-4:
CODE WORD ORGANIZATION (SYNCHRONOUS TRANSMISSION MODE)
Fixed Portion
Encrypted Portion
Reserved
(16 bits)
Padding
(2 bits)
Function
Code
Serial Number
(28 bits)
Function
Code
DISC+ OVR
(12 bits)
Sync Counter
(16 bits)
(4-bit)
(4-bit)
82 Data bits
Transmitted
LSb first.
LSb
MSb
DS41097C-page 10
2001 Microchip Technology Inc.
HCS320
5.3
VLOW: Voltage LOW Indicator
5.0
5.1
SPECIAL FEATURES
Code Word Completion
The VLOW bit is transmitted with every transmission
(Figure 8-6) and will be transmitted as a one if the oper-
ating voltage has dropped below the low voltage trip
point. The trip point is selectable between two values,
based on the battery voltage being used. See
Section 3.5.4 for a description of how the low voltage
select option is set. This VLOW signal is transmitted so
the receiver can alert the user that the transmitter bat-
tery is low.
Code word completion is an automatic feature that
makes sure that the entire code word is transmitted,
even if the transmit button is released before the trans-
mission is complete. The HCS320 encoder powers
itself up when a button is pushed and powers itself
down after the command is finished, if the user has
already released the button. If the button is held down
beyond the time for one transmission, then multiple
transmissions will result. If another button is activated
during a transmission, the active transmission will be
aborted and the function new code will be generated
using the new button information.
Note: Depending on the internal resistance of the
VDD source, VDD may normally be above
the VLOW trip point except when the LED is
turned on. In this case, the VLOW bit will be
transmitted as a one when a transmission
occurs while the LED is on. The VLOW bit
will be transmitted as a zero when a trans-
mission occurs while the LED is off.
5.2
Auto-Shutoff
The Auto-shutoff function automatically stops the
device from transmitting if a button inadvertently gets
pressed for a long period of time. This will prevent the
device from draining the battery if a button gets
pressed while the transmitter is in a pocket or purse.
This function can be enabled or disabled and is
selected by setting or clearing the Auto-shutoff bit
(Section 3.4.1). Setting this bit high will enable the
function (turn Auto-shutoff function on) and setting the
bit low will disable the function. Time-out period is
dependent on the shift level and is approximately 42
±10 seconds.
5.4
RPT: Repeat Indicator
This bit will be low for the first transmitted word. If a
button is held down for more than one transmitted code
word, this bit will be set to indicate a repeated code
word and remain set until the button is released.
5.5
LED Output Operation
During normal transmission the LED output (Figure 5-1)
indicates the shift level (Section 5.7) by flashing the
LED in a pattern corresponding to the shift level. If the
supply voltage drops below the low voltage trip point
(Section 3.5.4), the LED output will be toggled at
approximately 5 Hz during the transmission.
FIGURE 5-1:
LED FLASH FUNCTION (EACH DIVISION - 180 MS)
LED OUTPUT
SHIFT
LEVEL
0
1
2
3
2001 Microchip Technology Inc.
DS41097C-page 11
HCS320
(Figure 5-1). This is a selectable feature that is deter-
mined in conjunction with the baud rate selection bits
BSL0 and BSL1. Using the BACW allows the user to
transmit a higher amplitude transmission if the trans-
mission length is shorter. The FCC puts constraints on
the average power that can be transmitted by a
device, and BACW effectively prevents continuous
transmission by only allowing the transmission of
every second or every fourth code word. This reduces
the average power transmitted and hence, assists in
FCC approval of a transmitter device.
5.6
Blank Alternate Code Word
Federal Communications Commission (FCC) part 15
rules specify the limits on fundamental power and
harmonics that can be transmitted. Power is calcu-
lated on the worst case average power transmitted in
a 100 ms window. It is therefore advantageous to
minimize the duty cycle of the transmitted word. This
can be achieved by minimizing the duty cycle of the
individual bits and by blanking out consecutive words.
Blank Alternate Code Word (BACW) is used for
reducing the average power of a transmission
FIGURE 5-2:
BLANK ALTERNATE CODE WORD (BACW)
Amplitude
BACW Disabled
(All words transmitted)
Code Word
Code Word
Code Word
Code Word
A
BACW Enabled
(1 out of 2 transmitted)
2A
4A
BACW Enabled
(1 out of 4 transmitted)
Time
DS41097C-page 12
2001 Microchip Technology Inc.
HCS320
TABLE 5-1:
PIN ACTIVATION TABLE
5.7
SHIFT Key Operation
The HCS320 has four switch inputs usually connected
to buttons as shown in Figure 2-1: Typical Circuits.
FUNCTION
CODE
SHIFT
LEVEL
S2
S1
S0
0
0
0
0
0
1
1
1
1
1
2
2
2
2
2
3
3
3
3
3
0
0
0
0
1
0
0
0
0
1
0
0
0
0
1
0
0
0
0
1
0
0
1
1
0
0
0
1
1
0
0
0
1
1
0
0
0
1
1
0
0
1
0
1
0
0
1
0
1
0
0
1
0
1
0
0
1
0
1
0
No Transmission
Any button connected to input S0, S1 or S2 is called a
TRANSMIT button as it causes a transmission when
pressed.
0h
1h
The SHIFT button is connected to the SHIFT input.
Pressing the SHIFT button increments a counter by
one count and does not result in a transmission. The
counter value is called the shift level. Successive
presses of the SHIFT button can increase the shift level
up to three before wrapping back to zero. The shift level
is available for eight seconds when the SHIFT button is
released, after which the shift level is reset to zero.
2h
3h
No Transmission
4h
5h
6h
7h
When a TRANSMIT button is pressed, the function
code transmitted for that button depends on the shift
level. The transmitted function code corresponding to
shift level and S0, S1 and S2 switch activation is shown
in Table 5-1 for all legal combinations of shift level and
button input. Note that a shift level of zero means that
the SHIFT button has not been pressed (or it has been
pressed four times). The shift level is reset to zero after
a transmission.
No Transmission
8h
9h
Ah
Bh
No Transmission
Ch
Dh
Eh
Fh
The volatile nature of the shift level register requires the
HCS320 to be powered continuously for correct opera-
tion and not powered via the buttons.
2001 Microchip Technology Inc.
DS41097C-page 13
HCS320
data in line. After each 16-bit word is loaded, a pro-
gramming delay is required for the internal program
cycle to complete. This delay can take up to TWC. At the
end of the programming cycle, the device can be veri-
fied (Figure 6-2) by reading back the EEPROM. Read-
ing is done by clocking the S2 line and reading the data
bits on PWM. For security reasons, it is not possible to
execute a verify function without first programming the
EEPROM. A Verify operation can only be done
once, immediately following the Program cycle.
6.0
PROGRAMMING THE HCS320
When using the HCS320 in a system, the user will have
to program some parameters into the device including
the serial number and the secret key before it can be
used. The programming cycle allows the user to input
all 192 bits in a serial data stream, which are then
stored internally in EEPROM. Programming will be
initiated by forcing the PWM line high, after the S2 line
has been held high for the appropriate length of time
line (Table 6-1 and Figure 6-1). After the Program
mode is entered, a delay must be provided to the
device for the automatic bulk write cycle to complete.
This will set all locations in the EEPROM to zeros . The
device can then be programmed by clocking in 16 bits
at a time, using S2 as the clock line and PWM as the
Note: To ensure that the device does not acci-
dentally enter Programming mode, PWM
should never be pulled high by the circuit
connected to it. Special care should be
taken when driving PNP RF transistors.
FIGURE 6-1:
PROGRAMMING WAVEFORMS
Enter Program
Mode
TPBW
TCLKH
TDS
TWC
S2
(Clock)
TPS
TPH1
TDH
Bit 3
TCLKL
Bit 0 Bit 1
PWM
(Data)
Bit 2
Bit 14 Bit 15
Bit 16 Bit 17
Data for Word 1
Data for Word 0 (KEY_0)
Repeat for each word (12 times)
TPH2
Note 1: Unused button inputs to be held to ground during the entire programming sequence.
2: The VDD pin must be taken to ground after a Program/Verify cycle.
FIGURE 6-2:
VERIFY WAVEFORMS
Beginning of Verify Cycle
Data from Word 0
End of Programming Cycle
PWM
(Data)
Bit190 Bit191
Bit 0
Bit 1 Bit 2 Bit 3
Bit 14
Bit 15
Bit 16 Bit 17
Bit190 Bit191
TWC
TDV
S2
(Clock)
Note: If a Verify operation is to be done, then it must immediately follow the Program cycle.
DS41097C-page 14
2001 Microchip Technology Inc.
HCS320
TABLE 6-1:
PROGRAMMING/VERIFY TIMING REQUIREMENTS
VDD = 5.0V ± 10%, 25 °C ± 5 °C
Parameter
Symbol
TPS
Min.
3.5
3.5
50
Max.
4.5
—
Units
ms
ms
µs
Program mode setup time
Hold time 1
TPH1
TPH2
TPBW
TPROG
TWC
Hold time 2
—
Bulk Write time
4.0
4.0
50
—
ms
ms
ms
µs
Program delay time
Program cycle time
Clock low time
—
—
TCLKL
TCLKH
TDS
50
—
Clock high time
50
—
µs
µs(1)
µs(1)
µs(1)
Data setup time
0
—
Data hold time
TDH
30
—
—
Data out valid time
TDV
30
Note 1: Typical values - not tested in production.
2001 Microchip Technology Inc.
DS41097C-page 15
HCS320
FIGURE 7-1:
TYPICAL LEARN
SEQUENCE
7.0
INTEGRATING THE HCS320
INTO A SYSTEM
Enter Learn
Use of the HCS320 in a system requires a compatible
decoder. This decoder is typically a microcontroller with
compatible firmware. Microchip will provide (via a
license agreement) firmware routines that accept
transmissions from the HCS320 and decrypt the
hopping code portion of the data stream. These
routines provide system designers the means to
develop their own decoding system.
Mode
Wait for Reception
of a Valid Code
Generate Key
from Serial Number
Use Generated Key
to Decrypt
7.1
Learning a Transmitter to a
Receiver
Compare Discrimination
Value with Fixed Value
A transmitter must first be ’learned’ by a decoder before
its use is allowed in the system. Several learning strat-
egies are possible, Figure 7-1 details a typical learn
sequence. Core to each, the decoder must minimally
store each learned transmitter’s serial number and cur-
rent synchronization counter value in EEPROM. Addi-
tionally, the decoder typically stores each transmitter’s
unique crypt key. The maximum number of learned
transmitters will therefore be relative to the available
EEPROM.
No
Equal
?
Yes
Wait for Reception
of Second Valid Code
Use Generated Key
to Decrypt
A transmitter’s serial number is transmitted in the clear
but the synchronization counter only exists in the code
word’s encrypted portion. The decoder obtains the
counter value by decrypting using the same key used
to encrypt the information. The KEELOQ algorithm is a
symmetrical block cipher so the encryption and decryp-
tion keys are identical and referred to generally as the
crypt key. The encoder receives its crypt key during
manufacturing. The decoder is programmed with the
ability to generate a crypt key as well as all but one
required input to the key generation routine; typically
the transmitter’s serial number.
Compare Discrimination
Value with Fixed Value
No
Equal
?
Yes
No
Counters
Sequential
?
Figure 7-1 summarizes a typical learn sequence. The
decoder receives and authenticates a first transmis-
sion; first button press. Authentication involves gener-
ating the appropriate crypt key, decrypting, validating
the correct key usage via the discrimination bits and
buffering the counter value. A second transmission is
received and authenticated. A final check verifies the
counter values were sequential; consecutive button
presses. If the learn sequence is successfully com-
plete, the decoder stores the learned transmitter’s
serial number, current synchronization counter value
and appropriate crypt key. From now on the crypt key
will be retrieved from EEPROM during normal opera-
tion instead of recalculating it for each transmission
received.
Yes
Learn
Unsuccessful
Learn successful Store:
Serial number
Encryption key
Synchronization counter
Exit
Certain learning strategies have been patented and
care must be taken not to infringe.
DS41097C-page 16
2001 Microchip Technology Inc.
HCS320
7.2
Decoder Operation
7.3
Synchronization with Decoder
(Evaluating the Counter)
Figure 7-2 summarizes normal decoder operation. The
decoder waits until a transmission is received. The
received serial number is compared to the EEPROM
table of learned transmitters to first determine if this
transmitter’s use is allowed in the system. If from a
learned transmitter, the transmission is decrypted
using the stored crypt key and authenticated via the
discrimination bits for appropriate crypt key usage. If
the decryption was valid the synchronization value is
evaluated.
The KEELOQ technology patent scope includes a
sophisticated synchronization technique that does not
require the calculation and storage of future codes. The
technique securely blocks invalid transmissions while
providing transparent resynchronization to transmitters
inadvertently activated away from the receiver.
Figure 7-3 shows a 3-partition, rotating synchronization
window. The size of each window is optional but the
technique is fundamental. Each time a transmission is
authenticated, the intended function is executed and
the transmission’s synchronization counter value is
stored in EEPROM. From the currently stored counter
value there is an initial "Single Operation" forward win-
dow of 16 codes. If the difference between a received
synchronization counter and the last stored counter is
within 16, the intended function will be executed on the
single button press and the new synchronization
counter will be stored. Storing the new synchronization
counter value effectively rotates the entire synchroniza-
tion window.
FIGURE 7-2:
TYPICAL DECODER
OPERATION
Start
No
Transmission
Received
?
Yes
A "Double Operation" (resynchronization) window fur-
ther exists from the Single Operation window up to 32K
codes forward of the currently stored counter value. It
is referred to as "Double Operation" because a trans-
mission with synchronization counter value in this win-
dow will require an additional, sequential counter
transmission prior to executing the intended function.
Upon receiving the sequential transmission the
decoder executes the intended function and stores the
synchronization counter value. This resynchronization
occurs transparently to the user as it is human nature
to press the button a second time if the first was unsuc-
cessful.
Does
Serial Number
Match
No
?
Yes
Decrypt Transmission
Is
No
Decryption
Valid
?
Yes
The third window is a "Blocked Window" ranging from
the double operation window to the currently stored
synchronization counter value. Any transmission with
synchronization counter value within this window will
be ignored. This window excludes previously used,
perhaps code-grabbed transmissions from accessing
the system.
Execute
Command
and
Update
Counter
Is
Counter
Within 16
?
Yes
No
No
No
Is
Counter
Within 32K
?
Note: The synchronization method described in
this section is only a typical implementation
and because it is usually implemented in
firmware, it can be altered to fit the needs
of a particular system.
Yes
Save Counter
in Temp Location
2001 Microchip Technology Inc.
DS41097C-page 17
HCS320
FIGURE 7-3:
SYNCHRONIZATION WINDOW
Entire Window
rotates to eliminate
use of previously
used codes
Blocked
Window
(32K Codes)
Stored
Synchronization
Counter Value
Double Operation
(resynchronization)
Window
Single Operation
Window
(16 Codes)
(32K Codes)
DS41097C-page 18
2001 Microchip Technology Inc.
HCS320
8.0
ELECTRICAL CHARACTERISTICS
TABLE 8-1:
Symbol
ABSOLUTE MAXIMUM RATINGS
Item
Rating
Units
VDD
VIN
Supply voltage
Input voltage
-0.3 to 13.3
-0.3 to 13.3
-0.3 to VDD + 0.3
25
V
V
VOUT
IOUT
TSTG
TLSOL
VESD
Output voltage
V
mA
Max output current
Storage temperature
Lead soldering temp
ESD rating
-55 to +125
300
°C (Note)
°C (Note)
V
4000
Note: Stresses above those listed under “ABSOLUTE MAXIMUM RATINGS” may cause permanent damage to
the device.
TABLE 8-2:
DC CHARACTERISTICS
Commercial(C):Tamb = 0°C to +70°C
Industrial(I):Tamb = -40°C to +85°C
3.5V < VDD < 13.0V
Parameter
Sym.
Min
Typ*
Max
Unit
Conditions
Operating current (avg)
ICC
0.6
2.0
10.0
1.0
3.0
15.0
VDD = 3.5V
VDD = 6.6V
VDD = 13.0V
(Figure 8-1)
mA
Standby current
ICCS
VIH
1
10
µA
High level Input voltage
0.4 VDD
VDD+
0.3
V
Low level input voltage
High level output voltage
Low level output voltage
LED sink current
VIL
VOH
VOL
ILED
-0.3
0.15 VDD
V
V
0.5 VDD
IOH = -2 mA
IOL = 2 mA
0.11 VDD
V
5.0
11.0
6.5
14
9.0
20
mA
VDD = 6.6V
VDD = 13.0V
Pull-down Resistance;
S0,S1,S2, SHIFT
RS0-3
RPWM
40
80
60
80
KΩ
KΩ
VIN = 4.0V
VIN = 4.0V
Pull-down Resistance;
PWM
120
160
Note: Typical values are at 25°C.
2001 Microchip Technology Inc.
DS41097C-page 19
HCS320
FIGURE 8-1:
TYPICAL ICC CURVE OF HCS320
12.0
10.0
8.0
6.0
4.0
2.0
0.0
2
13
3
4
5
6
7
8
9
10
11
12
VBAT [V]
LEGEND
Typical
Maximum
Minimum
DS41097C-page 20
2001 Microchip Technology Inc.
HCS320
FIGURE 8-2:
POWER-UP AND TRANSMIT TIMING
Button Press
Detect
Multiple Code Word Transmission
TBP
TTD
TDB
PWM
Output
Code
Word
1
Code
Word
3
Code
Word
4
Code
Word
n
Code
Word
2
TTO
Button
Input
Sn
FIGURE 8-3:
POWER-UP AND TRANSMIT TIMING REQUIREMENTS
VDD = +3.5 to13.0V
Commercial (C): Tamb = 0°C to +70°C
Industrial
(I): Tamb = -40°C to +85°C
Parameter
Symbol
Min
Max
Unit
Remarks
(Note 1)
Time to second button press
TBP
10 + Code 27 + Code
Word Time Word Time
ms
Transmit delay from button detect
Debounce delay
TTD
TDB
TTO
10
6
27
15
77
ms
ms
s
Auto-shutoff time-out period
22
(Note 2)
Note 1: TBP is the time in which a second button can be pressed without completion of the first code word and the
intention was to press the combination of buttons.
2: The Auto-shutoff time-out period is not tested.
FIGURE 8-4:
CODE WORD FORMAT
TE TE
TE
LOGIC ‘0’
LOGIC ‘1’
Bit Period
TBP
50% Duty Cycle
Preamble
TP
Encrypted Portion
of Transmission
Fixed Portion of
Transmission
Guard
Time
TG
Header
TH
TFIX
THOP
2001 Microchip Technology Inc.
DS41097C-page 21
HCS320
FIGURE 8-5:
CODE WORD FORMAT: PREAMBLE/HEADER PORTION
P1
P12
Bit 0 Bit 1
Data Bits
23 TE 50% Duty Cycle Preamble
10 TE Header
FIGURE 8-6:
CODE WORD FORMAT: DATA PORTION
Serial Number
Button Code
S0 S1
Status
LSB
Bit 0 Bit 1
Encrypted Portion
MSB LSB
MSB S3
S2 VLOW RPT
Bit 30 Bit 31 Bit 32 Bit 33 Bit 58 Bit 59 Bit 60
Bit 62 Bit 63 Bit 64 Bit 65
Bit 61
Fixed Portion
Guard
Time
Header
TABLE 8-3:
CODE WORD TRANSMISSION TIMING REQUIREMENTS
VDD = +3.5 to 13.0
Commercial(C):Tamb = 0°C to +70°C
Industrial(I):Tamb = -40°C to +85°C
Code Words Transmitted
1 out of 2
All
1 out of 4
Number
of TE
Symbol
Characteristic
Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Units
TE
TBP
TP
Basic pulse element
PWM bit pulse width
Preamble duration
Header duration
1
280
400
620
140
420
3.2
1.4
200
600
4.6
2.0
310
930
7.1
3.1
70
210
1.6
0.7
6.7
7.1
100
300
2.3
1.0
9.6
155
465
3.6
µs
µs
3
840 1200 1860
23
10
96
102
199
430
—
6.4
2.8
9.2
4.0
14.3
6.2
ms
ms
ms
ms
ms
ms
TH
1.6
THOP Hopping code duration
26.9 38.4
28.6 40.8
59.5
63.2
13.4 19.2 29.8
14.3 20.4 31.6
14.9
TFIX
TG
—
Fixed code duration
Guard Time
10.2 15.8
55.6 79.6 123.5 28.1 39.8 61.7 13.8 19.9 30.6
Total Transmit Time
PWM data rate
120.3 172.0 266.7 60.4 86.0 133.3 29.9 43.0 66.5
—
1190 833
538
2381 1667 1075 4762 3333 2151 bps
Note: The timing parameters are not tested but derived from the oscillator clock.
DS41097C-page 22
2001 Microchip Technology Inc.
HCS320
FIGURE 8-7:
HCS320 TE VS. TEMP (BY CHARACTERIZATION ONLY)
1.7
1.6
1.5
TE Max.
VDD = 3.5V
1.4
1.3
1.2
VDD = 5.0V
TE Max.
TE
1.1
VDD = 5.0V
Typical
1.0
0.9
0.8
0.7
0.6
VDD = 5.0V
TE Min.
-50 -40 -30 -20 -10
0
10 20 30 40 50 60 70 80 90
TEMPERATURE
2001 Microchip Technology Inc.
DS41097C-page 23
HCS320
9.0
9.1
PACKAGING INFORMATION
Package Marking Information
8-Lead PDIP (300 mil)
Example
HCS200
XXXXXXXX
XXXXXNNN
XXXXXNNN
YYWW
0025
8-Lead SOIC (150 mil)
Example
XXXXXXX
HCS200
XXXYYWW
XXX0025
NNN
NNN
Legend: XX...X Customer specific information*
Y
Year code (last digit of calendar year)
YY
WW
NNN
Year code (last 2 digits of calendar year)
Week code (week of January 1 is week ‘01’)
Alphanumeric traceability code
Note: In the event the full Microchip part number cannot be marked on one line, it will
be carried over to the next line thus limiting the number of available characters
for customer specific information.
*
Standard PICmicro device marking consists of Microchip part number, year code, week code, and
traceability code. For PICmicro device marking beyond this, certain price adders apply. Please check
with your Microchip Sales Office. For QTP devices, any special marking adders are included in QTP
price.
DS41097C-page 24
2001 Microchip Technology Inc.
HCS320
9.2
Package Details
8-Lead Plastic Dual In-line (P) - 300 mil (PDIP)
E1
D
2
1
n
α
E
A2
A
L
c
A1
β
B1
B
p
eB
Units
INCHES*
NOM
MILLIMETERS
Dimension Limits
MIN
MAX
MIN
NOM
8
MAX
n
p
Number of Pins
Pitch
8
.100
.155
.130
2.54
Top to Seating Plane
A
.140
.170
3.56
2.92
3.94
3.30
4.32
Molded Package Thickness
Base to Seating Plane
Shoulder to Shoulder Width
Molded Package Width
Overall Length
A2
A1
E
.115
.015
.300
.240
.360
.125
.008
.045
.014
.310
5
.145
3.68
0.38
7.62
6.10
9.14
3.18
0.20
1.14
0.36
7.87
5
.313
.250
.373
.130
.012
.058
.018
.370
10
.325
.260
.385
.135
.015
.070
.022
.430
15
7.94
6.35
9.46
3.30
0.29
1.46
0.46
9.40
10
8.26
6.60
9.78
3.43
0.38
1.78
0.56
10.92
15
E1
D
Tip to Seating Plane
Lead Thickness
L
c
Upper Lead Width
B1
B
Lower Lead Width
Overall Row Spacing
Mold Draft Angle Top
Mold Draft Angle Bottom
§
eB
α
β
5
10
15
5
10
15
* Controlling Parameter
§ Significant Characteristic
Notes:
Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed
.010” (0.254mm) per side.
JEDEC Equivalent: MS-001
Drawing No. C04-018
2001 Microchip Technology Inc.
DS41097C-page 25
HCS320
8-Lead Plastic Small Outline (SN) - Narrow, 150 mil (SOIC)
E
E1
p
D
2
B
n
1
h
α
45°
c
A2
A
φ
β
L
A1
Units
INCHES*
NOM
MILLIMETERS
Dimension Limits
MIN
MAX
MIN
NOM
8
MAX
n
p
Number of Pins
Pitch
8
.050
.061
.056
.007
.237
.154
.193
.015
.025
4
1.27
Overall Height
A
.053
.069
1.35
1.32
1.55
1.42
0.18
6.02
3.91
4.90
0.38
0.62
4
1.75
Molded Package Thickness
Standoff
A2
A1
E
.052
.004
.228
.146
.189
.010
.019
0
.061
.010
.244
.157
.197
.020
.030
8
1.55
0.25
6.20
3.99
5.00
0.51
0.76
8
§
0.10
5.79
3.71
4.80
0.25
0.48
0
Overall Width
Molded Package Width
Overall Length
E1
D
Chamfer Distance
Foot Length
h
L
φ
Foot Angle
c
Lead Thickness
Lead Width
.008
.013
0
.009
.017
12
.010
.020
15
0.20
0.33
0
0.23
0.42
12
0.25
0.51
15
B
α
β
Mold Draft Angle Top
Mold Draft Angle Bottom
0
12
15
0
12
15
* Controlling Parameter
§ Significant Characteristic
Notes:
Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed
.010” (0.254mm) per side.
JEDEC Equivalent: MS-012
Drawing No. C04-057
DS41097C-page 26
2001 Microchip Technology Inc.
HCS320
Systems Information and Upgrade Hot
Line
ON-LINE SUPPORT
Microchip provides on-line support on the Microchip
World Wide Web (WWW) site.
The Systems Information and Upgrade Line provides
system users a listing of the latest versions of all of
Microchip's development systems software products.
Plus, this line provides information on how customers
can receive any currently available upgrade kits.The
Hot Line Numbers are:
The web site is used by Microchip as a means to make
files and information easily available to customers. To
view the site, the user must have access to the Internet
and a web browser, such as Netscape or Microsoft
Explorer. Files are also available for FTP download
from our FTP site.
1-800-755-2345 for U.S. and most of Canada, and
1-480-792-7302 for the rest of the world.
Connecting to the Microchip Internet Web
Site
The Microchip web site is available by using your
favorite Internet browser to attach to:
www.microchip.com
The file transfer site is available by using an FTP ser-
vice to connect to:
ftp://ftp.microchip.com
The web site and file transfer site provide a variety of
services. Users may download files for the latest
Development Tools, Data Sheets, Application Notes,
User’s Guides, Articles and Sample Programs. A vari-
ety of Microchip specific business information is also
available, including listings of Microchip sales offices,
distributors and factory representatives. Other data
available for consideration is:
• Latest Microchip Press Releases
• Technical Support Section with Frequently Asked
Questions
• Design Tips
• Device Errata
• Job Postings
• Microchip Consultant Program Member Listing
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2001 Microchip Technology Inc.
DS41097C-page 27
HCS320
READER RESPONSE
It is our intention to provide you with the best documentation possible to ensure successful use of your Microchip prod-
uct. If you wish to provide your comments on organization, clarity, subject matter, and ways in which our documentation
can better serve you, please FAX your comments to the Technical Publications Manager at (480) 792-4150.
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Literature Number:
DS41097C
Device:
HCS320
Questions:
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2. How does this document meet your hardware and software development needs?
3. Do you find the organization of this data sheet easy to follow? If not, why?
4. What additions to the data sheet do you think would enhance the structure and subject?
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DS41097C-page 28
2001 Microchip Technology Inc.
HCS320
HCS320 PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.
HCS320 /P
-
Package:
P = Plastic DIP (300 mil Body), 8-lead
SN = Plastic SOIC (150 mil Body), 8-lead
Temperature
Range:
Blank = 0°C to +70°C
I = –40°C to +85°C
Device:
HCS320
HCS320T
Code Hopping Encoder
Code Hopping Encoder (Tape and Reel)
=
=
Sales and Support
Data Sheets
Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences
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Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using.
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2001 Microchip Technology Inc.
DS41097C-page 29
HCS320
NOTES:
DS41097C-page 30
2001 Microchip Technology Inc.
Microchip’s Secure Data Products are covered by some or all of the following patents:
Code hopping encoder patents issued in Europe, U.S.A., and R.S.A. — U.S.A.: 5,517,187; Europe: 0459781; R.S.A.: ZA93/4726
Secure learning patents issued in the U.S.A. and R.S.A. — U.S.A.: 5,686,904; R.S.A.: 95/5429
Information contained in this publication regarding device
applications and the like is intended through suggestion only
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
No representation or warranty is given and no liability is
assumed by Microchip Technology Incorporated with respect
to the accuracy or use of such information, or infringement of
patents or other intellectual property rights arising from such
use or otherwise. Use of Microchip’s products as critical com-
ponents in life support systems is not authorized except with
express written approval by Microchip. No licenses are con-
veyed, implicitly or otherwise, under any intellectual property
rights.
Trademarks
The Microchip name and logo, the Microchip logo, FilterLab,
KEELOQ, MPLAB, PIC, PICmicro, PICMASTER, PICSTART,
PRO MATE, SEEVAL and The Embedded Control Solutions
Company are registered trademarks of Microchip Technology
Incorporated in the U.S.A. and other countries.
dsPIC, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB,
In-Circuit Serial Programming, ICSP, ICEPIC, microID,
microPort, Migratable Memory, MPASM, MPLIB, MPLINK,
MPSIM, MXDEV, PICC, PICDEM, PICDEM.net, rfPIC, Select
Mode and Total Endurance are trademarks of Microchip
Technology Incorporated in the U.S.A.
Serialized Quick Turn Programming (SQTP) is a service mark
of Microchip Technology Incorporated in the U.S.A.
All other trademarks mentioned herein are property of their
respective companies.
© 2001, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
Microchip received QS-9000 quality system
certification for its worldwide headquarters,
design and wafer fabrication facilities in
Chandler and Tempe, Arizona in July 1999. The
Company’s quality system processes and
procedures are QS-9000 compliant for its
PICmicro® 8-bit MCUs, KEELOQ® code hopping
devices, Serial EEPROMs and microperipheral
products. In addition, Microchip’s quality
system for the design and manufacture of
development systems is ISO 9001 certified.
2001 Microchip Technology Inc.
DS41097C - page 31
WORLDWIDE SALES AND SERVICE
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10/01/01
DS41097C-page 32
2001 Microchip Technology Inc.
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