BR34E02FVT-WTR [ROHM]
DDR/DDR2 (For memory module) SPD Memory; DDR / DDR2 （对于内存模块）内存SPD
| 型号： | BR34E02FVT-WTR |
| 厂家： | 
ROHM |
| 描述： | DDR/DDR2 (For memory module) SPD Memory |
| 文件： | 总20页 (文件大小：1184K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TECHNICAL NOTE
Double-cell Memory for Plug & Play
DDR/DDR2
(For memory module) SPD Memory
BR34E02-W
●Description
BR34E02FVT-W is 256×8 bit Electrically Erasable PROM (Based on Serial Presence Detect)
●Features
・256×8 bit architecture serial EEPROM
・Wide operating voltage range: 1.7V-3.6V
・Two-wire serial interface
・High reliability connection using Au pads and Au wires
・Self-Timed Erase and Write Cycle
・Page Write Function (16byte)
・Write Protect Mode
Settable Reversible Write Protect Function: 00h-7Fh
Write Protect 1 (Onetime Rom)
Write Protect 2 (Hardwire WP PIN)
・Low Power consumption
: 00h-7Fh
: 00h-FFh
Write
Read
(at 1.7V )
(at 1.7V )
:
:
:
0.4mA (typ.)
0.1mA(typ.)
0.1μA(typ.)
Standby ( at 1.7V )
・DATA security
Write protect feature (WP pin)
Inhibit to WRITE at low VCC
・Compact package: TSSOP-B8, VSON008X2030
・High reliability fine pattern CMOS technology
・Rewriting possible up to 1,000,000 times
・Data retention: 40 years
・Noise reduction Filtered inputs in SCL / SDA
・Initial data FFh at all addresses
●BR34E02-W Series
Capacity Bit format
2Kbit 256X8
Type
BR34E02-W
Power Source Voltage TSSOP-B8 VSON008X2030
1.7V～3.6V
●
●
Ver.A Aug.2007
●Absolute Maximum Ratings (Ta=25℃)
Parameter
Supply Voltage
Symbol
Rating
-0.3～+6.5
Unit
V
VCC
330(BR34E02FVT-W)
*1
Power Dissipation
Pd
mW
300(BR34E02NUX-W) *2
-65～+125
Storage Temperature
Tstg
℃
℃
V
Operating Temperature
Terminal Voltage (A0)
Terminal Voltage (etcetera)
Topr
-40～+85
-
-
-0.3～10.0
-0.3～VCC+0.3
V
* Reduce by 3.3mW(*1), 3.0 mW(*2)/°C over 25°C
●Recommended operating conditions
Parameter Symbol
Rating
1.7～3.6
0～VCC
Unit
V
V
Supply Voltage
Input Voltage
VCC
ＶIN
●Memory cell characteristics（Ta=25℃, VCC=1.7V～3.6V）
Specification
Parameter
Unit
Min.
1,000,000
40
Typ.
－
Max.
－
Write / Erase Cycle *1
Data Retention *1
Cycles
Years
－
－
*1:Not 100% TESTED
●Electrical characteristics - DC（Unless otherwise specified Ta=-40℃～+85℃, VCC=1.7V～3.6V）
Specification
Parameter
Symbol
Unit
Test Condition
Min.
Typ.
Max.
Vcc+0.3
0.3 VCC
0.4
"H" Input Voltage
VIH1
VIL1
VOL1
VOL2
ILI1
0.7 VCC
-
-
-
-
-
-
-
-
V
V
"L" Input Voltage
-
-0.3
-
"L" Output Voltage 1
"L" Output Voltage 2
Input Leakage Current 1
Input Leakage Current 2
Input Leakage Current 3
Output Leakage Current
V
IOL=2.1mA，2.5V≦VCC≦3.6V（SDA）
IOL=0.7mA，1.7V≦VCC＜2.5V（SDA）
VIN=0V～VCC（A0,A1,A2,SCL）
VIN=0V～VCC（WP）
0.2
V
-1
-1
-1
-1
1
μA
μA
μA
μA
ILI2
15
ILI3
20
VIN=VHV(A0)
ILO
1
VOUT=0V～VCC
VCC=1.7V,fSCL=100ｋHz，tWR=5ms
Byte Write
ICC1
ICC2
ICC3
-
-
-
1.0
3.0
0.5
mA
mA
mA
-
-
-
Page Write
Write Protect
VCC =3.6V,fSCL=100ｋHz, tWR=5ms
Byte Write
Operating Current
Page Write
Write Protect
VCC =3.6V,fSCL=100ｋHz
Random Read
Current Read
Sequential Read
VCC =3.6V,SDA,SCL= VCC
Standby Current
A0 HV Voltage
ISB
-
2.0
10
μA
-
-
A0,A1,A2=GND,WP=GND
VHV
7
V
VHV-Vcc≧4.8V
○Note: This IC is not designed to be radiation-resistant.
2/19
●Electrical characteristics - AC（Unless otherwise specified Ta=-40℃～+85℃, VCC =1.7V～3.6V）
FAST-MODE
STANDARD-MODE
Parameter
Clock Frequency
Symbol
2.5V≦VCC≦5.5V
1.7V≦VCC≦5.5V
Unit
Min.
Typ.
－
－
－
－
－
－
－
－
－
－
－
－
－
－
Max.
Min.
Typ.
－
－
－
－
－
－
－
－
－
－
－
－
－
－
Max.
fSCL
tHIGH
tLOW
tR
－
0.6
1.2
－
400
－
－
0.3
0.3
－
－
－
－
0.9
－
－
－
5
－
4.0
4.7
－
100
－
－
1.0
0.3
－
－
－
－
3.5
－
－
－
5
kHz
μs
μs
μs
μs
μs
μs
ns
Data Clock High Period
Data Clock Low Period
SDA and SCL Rise Time *1
SDA and SCL Fall Time *1
Start Condition Hold Time
Start Condition Setup Time
Input Data Hold Time
Input Data Setup Time
Output Data Delay Time
Output Data Hold Time
Stop Condition Setup Time
Bus Free Time
tF
－
－
tHD:STA
tSU:STA
tHD:DAT
tSU:DAT
tPD
0.6
0.6
0
4.0
4.7
0
250
0.1
0.1
4.0
4.7
－
100
0.1
0.1
0.6
1.2
－
ns
μs
μs
μs
μs
ms
tDH
tSU:STO
tBUF
tWR
Write Cycle Time
Noise Spike Width (SDA
and SCL)
tI
－
－
0.1
－
－
0.1
μs
tHD：WP
tSU：WP
tHIGH：WP
0
0.1
1.0
－
－
－
－
－
－
0
－
－
－
－
－
－
ns
WP Hold Time
0.1
1.0
μs
WP Setup Time
μs
WP High Period
*1：Not 100％ TESTED
■Fast / Standard Modes
Fast mode and Standard mode differ only in operation frequency. Operations performed at 100kHz are considered in
"Standard-mode", while those conducted at 400kHz are in "Fast-mode".
Please note that these clock frequencies are maximum values. At lower power supply voltage it is difficult to operate at high
speeds.
The EEPROM can operate at 400kHz, between 2.5V and 3.6V, and at 100kHz from 1.7V-2.5V.
●Synchronous Data Timing
tR
tF
tHIGH
SCL
SCL
SDA
DATA(n)
tHD:STA
tSU:DAT tLOW
tHD:DAT
DATA(1)
D1
SDA
(IN)
ACK
ACK
D0
tBUF
tPD
tDH
tWR
STOP BIT
SDA
(OUT)
WP
Fig.1-(a) Synchronous Data Timing
ｔＨＤ：WP
tSU：WP
○ SDA data is latched into the chip at the rising edge
○ of SCL clock.
○ Output data toggles at the falling edge of SCL clock.
Fig.1-(d) WP Timing Of The Write Operation
SCL
SDA
DATA(n)
DATA(1)
D1
SCL
D0
ACK
ACK
tSU:STA
tHD:STA
tSU:STO
ｔHIGH : WP
tWR
SDA
WP
STOP BIT
START BIT
Fig.1-(e) WP Timing Of The Write Cancel Operation
Fig.1-(b) Start/Stop Bit Timing
○For WRITE operation, WP must be "Low" from the rising edge of
the clock (which takes in D0 of first byte) until the end of tWR.
(See Fig.1-(d) ) During this period, WRITE operation can be
canceled by setting WP "High".（See Fig.1-(e)）
○When WP is set to "High" during tWR, WRITE operation is
immediately ceased, making the data unreliable. It must then
be re-written.
SCL
SDA
D0
WRITE DATA(n)
ACK
tWR
STOP
CONDITION
START
CONDITION
Fig.1-(c) Write Cycle Timing
3/19
●Block diagram
PROTECT_MEMORY_ARRY
2Kbit_MEMORY_ARRY
A0 1
A1 2
8 VCC
7 WP
8bit
8bit
ADDRESS
DECODER
SLAVE , WORD
DATA
REGISTER
8bit
ADDRESS REGISTER
START
STOP
A2 3
6 SCL
5 SDA
CONTOROL LOGIC
ACK
GND 4
HIGH VOLTAGE GEN.
VCC LEVEL DETECT
Fig.2 Block Diagram
●Pinout diagram and description
Pin Name
Input/Output
Functions
－
－
IN
IN
VCC
Power Supply
Ground 0V
Slave Address Set.
Serial Clock Input
A0 1
A1 2
8 VCC
GND
A0,A1,A2
SCL
7 WP
6 SCL
5 SDA
BR34E02FVT-W
BR34E02NUX-W
A2 3
Slave and Word Address,
Serial Data Input, Serial Data Output
*1
*2
SDA
WP
IN / OUT
IN
GND 4
Write Protect Input
*1 Open drain output requires a pull-up resistor.
*2 WP Pin has a Pull-Down resistor. Please leave unconnected or
connect to GND when not in use.
Fig.3 Pin Configuration
●Electrical characteristics curves
The following characteristic data are typ. value.
6
6
5
4
3
2
1
0
1
0.8
0.6
0.4
0.2
0
5
4
SPEC
3
Ta=85℃
Ta=-40℃
Ta=25℃
SPEC
2
Ta=85℃
Ta=85℃
Ta=-40℃
Ta=25℃
Ta=25℃
1
SPEC
Ta=-40℃
0
0
1
2
3
4
0
1
2
3
4
0
1
2
3
4
VCC[V]
VCC[V]
IOL1[mA]
Fig.5 "L" Input Voltage VIL
Fig.4 "H" Input Voltage VIH
(A0,A1,A2,SCL,SDA,WP)
Fig.6 "L" Output Voltage VOL1-IOL1
(VCC=2.5V)
(A0,A1,A2,SCL,SDA,WP)
1
0.8
0.6
1.2
1
16
SPEC
SPEC
12
0.8
0.6
0.4
0.2
0
8
Ta=85℃
0.4
Ta=25℃
SPEC
Ta=85℃
4
Ta=25℃
Ta=-40℃
0.2
0
Ta=85℃
Ta=25℃
Ta=-40℃
Ta=-40℃
0
0
1
2
3
4
0
1
2
3
4
0
1
2
3
4
IOL2[mA]
VCC[V]
VCC[V]
Fig.7 "L" Output Voltage VOL2-IOL2
(VCC=1.7V)
Fig.9 Input Leakage Current ILI2
(WP)
Fig.8 Input Leakage Current ILI1
(A0,A1,A2,SCL,SDA)
4/19
0.6
0.5
0.4
0.3
0.2
0.1
0
3.5
3
2.5
2
SPEC1
SPEC
SPEC
2.5
2
ｆSCL=400kHz(VCC≧2.5V)
ｆＳＣＬ=100kHz
DATA=AAh
fSCL=100kHz(1.7V≦Vcc＜２．５V)
DATA=AA
1.5
1
1.5
1
Ta=85℃
SPEC2
Ta=25℃
Ta=25℃
Ta=85℃
Ta=-40℃
0.5
0
Ta=85℃
Ta=25℃
0.5
0
Ta=-40℃
Ta=-40℃
0
1
2
3
4
0
1
2
3
4
0
1
2
3
4
VCC[V]
Fig.11 ReadVOCCp[Ve]rating Current ICC3
(fSCL=400kHz)
VCC[V]
Fig.12 Standby Current ISB
Fig.10 Write Operating Current ICC1,2
(fSCL=100kHz,400kHz)
5
10000
5
4
3
2
1
0
Ta=85℃
Ta=25℃
SPEC2
SPEC2
Ta=-40℃
4
1000
3
SPEC1
SPEC1:FAST-MODE
SPEC1:FAST-MODE
SPEC2:STANDARD-MODE
Ta=85℃
100
SPEC2
SPEC2:STANDARD-MODE
2
Ta=-40℃
Ta=25℃
Ta=25℃
Ta=-40℃
SPEC1
10
1
0
Ta=85℃
SPEC1
SPEC1:FAST-MODE
SPEC2:STANDARD-MODE
1
0
1
2
3
4
0
1
2
3
4
0
1
2
3
4
VCC[V]
VCC[V]
VCC[V]
Fig.15 Data Clock Low Period tLow
Fig.13 Clock Frequency fSCL
Fig.14 Data Clock High Period tHigh
5
50
5
SPEC2
SPEC1,2
SPEC2
4
4
0
Ta=85℃
Ta=25℃
3
3
-50
SPEC1:FAST-MODE
SPEC1:FAST-MODE
Ta=-40℃
SPEC2:STANDARD-MODE
SPEC2:STANDARD-MODE
2
2
-100
Ta=-40℃
Ta=-40℃
Ta=25℃
Ta=25℃
Ta=85℃
SPEC1:FAST-MODE
Ta=85℃
1
1
SPEC2:STANDARD-MODE
SPEC1
SPEC1
-150
0
0
-200
0
1
2
3
4
0
1
2
3
4
0
1
2
3
4
VCC[V]
VCC[V]
VCC[V]
Fig.16 Start Condition Hold Time
tHD:STA
Fig.17 Start Condition Setup Time
tSU:STA
Fig.18 Data Hold Time
tHD:DAT(High)
300
200
300
200
100
0
50
0
SPEC2
SPEC1,2
SPEC1:FAST-MODE
SPEC1
Ta=85℃
-50
100
SPEC2:STANDARD-MODE
Ta=25℃
Ta=-40℃
Ta=85℃
-100
-150
-200
0
Ta=85℃
Ta=25℃
-100
-200
SPEC1:FAST-MODE
Ta=-40℃
-100
SPEC1:FAST-MODE
SPEC2:STANDARD-MODE
Ta=25℃
Ta=-40℃
SPEC2:STANDARD-MODE
-200
0
1
2
3
4
0
1
2
3
4
0
1
2
3
4
VCC[V]
VCC[V]
VCC[V]
Fig.19 Data Hold Time
tHD:DAT(LOW)
Fig.20 Input Data Setup Time
tSU:DAT(HIGH)
Fig.21 Input Data Setup Time
tSU:DAT(LOW)
5/19
4
3
2
1
0
4
3
2
1
0
5
4
3
2
1
0
SPEC2
SPEC2
SPEC1:FAST-MODE
SPEC1:FAST-MODE
SPEC2:STANDARD-MODE
SPEC2:STANDARD-MODE
SPEC1:FAST-MODE
SPEC2:STANDARD-MODE
Ta=85℃
Ta=25℃
Ta=-40℃
Ta=85℃
SPEC1
Ta=85℃
Ta=25℃
Ta=-40
℃
SPEC2
Ta=25℃
Ta=-40℃
SPEC1
SPEC2
SPEC1
SPEC1
0
1
2
3
4
0
1
2
3
4
0
1
2
3
4
VCC[V]
VCC[V]
VCC[V]
Fig.23 Output Data Hold Time
tDH
Fig.24 Stop Condition Setup Time
tSU:STO
Fig.22 Output Data Delay Time
tPD
0.6
5
6
SPEC1:FAST-MODE
SPEC2
SPEC1,2
SPEC2:STANDARD-MODE
0.5
5
4
Ta=-40℃
0.4
4
Ta=-40℃
Ta=25℃
Ta=25℃
3
0.3
SPEC1:FAST-MODE
3
Ta=85℃
Ta=85℃
SPEC2:STANDARD-MODE
2
0.2
2
Ta=85℃
SPEC1,2
1
SPEC1
0.1
Ta=25℃
Ta=-40℃
1
SPEC1:FAST-MODE
0
SPEC2:STANDARD-MODE
0
0
0
1
2
3
4
0
1
2
3
4
0
1
2
3
4
VCC[V]
VCC[V]
VCC[V]
Fig.27 Noise Spike Width
tI(SCL H)
Fig.25 Bus Free Time
tBUF
Fig.26 Write Cycle Time
tWR
0.6
0.5
0.4
0.3
0.2
0.1
0
0.6
0.5
0.4
0.3
0.2
0.1
0
0.6
0.5
0.4
0.3
0.2
0.1
0
SPEC1:FAST-MODE
SPEC1:FAST-MODE
SPEC1:FAST-MODE
SPEC2:STANDARD-MODE
SPEC2:STANDARD-MODE
SPEC2:STANDARD-MODE
Ta=-40℃
Ta=-40℃
Ta=25℃
Ta=-40℃
Ta=25℃
Ta=85℃
Ta=85℃
Ta=25℃
Ta=85℃
SPEC1,2
SPEC1,2
SPEC1,2
0
1
2
3
4
0
1
2
3
4
0
1
2
3
4
VCC[V]
VCC[V]
VCC[V]
Fig.28 Noise Spike Width
tI(SCL L)
Fig.29 Noise Spike Width
tI(SDA H)
Fig.30 Noise Spike Width
tI(SDA L)
1.2
1
0.2
SPEC1,2
SPEC1,2
0
SPEC1:FAST-MODE
0.8
0.6
0.4
0.2
0
SPEC2:STANDARD-MODE
SPEC1:FAST-MODE
-0.2
SPEC2:STANDARD-MODE
Ta=25℃
Ta=85℃
-0.4
Ta=-40℃
Ta=25℃
Ta=85℃
Ta=-40℃
-0.6
0
1
2
3
4
0
1
2
3
4
VCC[V]
VCC[V]
Fig.32 WP High Period
tHigh:WP
Fig.31 WP Setup Time
tSU:WP
6/19
●Data transfer on the I2C BUS
○Data transfer on the I2C BUS
The BUS is considered to be busy after the START condition and free a certain time after the STOP condition.
Every SDA byte must be 8-bits long and requires an ACKNOWLEDGE signal after each byte. The devices have Master
and Slave configurations. The Master device initiates and ends data transfer on the BUS and generates the clock
signals in order to permit transfer.
The EEPROM in a slave configuration is controlled by a unique address. Devices transmitting data are referred to as
the Transmitter. The devices receiving the data are called Receiver.
○START Condition (Recognition of the START bit)
・All commands are proceeded by the start condition, which is a High to Low transition of SDA when SCL is High.
・The device continuously monitors the SDA and SCL lines for the start condition and will not respond to any command
until this condition has been met. (See Fig.1-(b) START/STOP Bit Timing)
○STOP Condition (Recognition of STOP bit)
・All communications must be terminated by a stop condition, which is a Low to High transition of SDA when SCL is
High. (See Fig.1-(b) START/STOP Bit Timing)
○Write Protect By Soft Ware
・Set Write Protect command and permanent set Write Protect command set data of 00h～7Fh in 256 words write
protection block. Clear Write Protect command can cancel write protection block which is set by set write Protect
command. Cancel of write protection block which is set by permanent set Write Protect command at once is
impossibility. When these commands are carried out, WP pin must be OPEN or GND.
○Acknowledge
・ Acknowledge is a software used to indicate successful data transfers. The Transmitter device will release the BUS
after transmitting eight bits. When inputting the slave address during write or read operation, the Transmitter is the μ
-COM. When outputting the data during read operation, the Transmitter is the EEPROM.
・During the ninth clock cycle the Receiver will pull the SDA line Low to verify that the eight bits of data have been
received. (When inputting the slave address during write or read operation, EEPROM is the receiver. When
outputting the data during read operation the receiver is the μ-COM.)
・The device will respond with an Acknowledge after recognition of a START condition and its slave address (8bit).
・In WRITE mode, the device will respond with an Acknowledge after the receipt of each subsequent 8-bit word (word
address and write data).
・In READ mode, the device will transmit eight bits of data, release the SDA line, and monitor the line for an
Acknowledge.
・If an Acknowledge is detected and no STOP condition is generated by the Master, the device will continue to transmit
the data. If an Acknowledge is not detected, the device will terminate further data transmissions and await a STOP
condition before returning to standby mode.
○Device Addressing
・Following a START condition, the Master outputs the Slave address to be accessed. The most significant four bits
of the slave address are the “device type indentifier.” For this EEPROM it is “1010.” (For WP register access this code
is "0110".)
・The next three bits identify the specified device on the BUS (device address). The device address is defined by the
state of the A0,A1 and A2 input pins. This IC works only when the device address input from the SDA pin corresponds
to the status of the A0,A1 and A2 input pins. Using this address scheme allows up to eight devices to be connected to
the BUS.
7/19
・The last bit of the stream (R/W…READ/WRITE) determines the operation to be performed.
R/W=0
R/W=1
････
････
WRITE (including word address input of Random Read)
READ
Slave Address Set Pin Device Type Device Address Read Write Mode
Access Area
A2
A1
A0
1010
A2 A1 A0
R/W
R/W
2kbit Access to Memory
Access to Permanent Set Write
Protect Memory
Access to Set Write Protect Memroy
Access to Clear Write Protect MEmory
A2
A1
A0
A2 A1 A0
0110
GND
GND
GND
Vcc
VHV
VHV
0
0
0
1
1
1
R/W
R/W
○WRITE PROTECT PIN(WP)
When WP pin set to Vcc (H level), write protect is set for 256 words (all address). When WP pin set to GND (L level),
it is enable to write 256 words (all address).
If permanent protection is done by Write Protect command, lower half area (00～7Fh address) is inhibited writing
regardless of WP pin state.
WP pin has a Pull-Down resistor. Please be left unconnected or connect to GND when WP feature is not in use.
○Confirm Write Protect Resistor by ACK
According to state of Write Protect Resistor, ACK is as follows.
State of Write
Protect Registor
Write
Cycle(tWR)
No
WP Input
-
Input Command
ACK
Address
-
ACK
No ACK
ACK
Data
ACK
PSWP, SWP, CWP No ACK
Page or Byte Write
No ACK
In case,
protect by PSWP
ACK
WA7～WA0
D7～D0 No ACK
No
(00～7Fh)
SWP
CWP
PSWP
No ACK
ACK
ACK
-
-
-
No ACK
ACK
ACK
-
-
-
No ACK
ACK
ACK
No
Yes
Yes
0
1
Page or Byte Write
(00～7Fh)
In case,
protect by SWP
ACK
WA7～WA0
ACK
D7～D0 No ACK
No
No ACK
No ACK
No ACK
SWP
CSP
PSWP
No ACK
ACK
ACK
-
-
-
No ACK
ACK
ACK
-
-
-
No
No
No
ACK
ACK
Page or Byte Write
PSWP, SWP, CWP
Page or Byte Write
PSWP, SWP, CWP
Page or Byte Write
WA7～WA0
D7～D0 No ACK
No
Yes
Yes
No
No
ACK
ACK
No ACK
No ACK
ACK
ACK
ACK
ACK
-
ACK
ACK
ACK
ACK
-
0
1
In case,
Not protect
WA7～WA0
-
WA7～WA0
D7～D0
-
D7～D0
- is Don’t Care
State of Write Protect Registor
In case, protect by PSWP
Command
PSWP, SWP, CWP No ACK
ACK
Address
ACK
Data
ACK
No ACK
No ACK
No ACK
No ACK
No ACK
-
-
-
-
-
No ACK
No ACK
No ACK
No ACK
No ACK
-
-
-
-
-
SWP
CWP
PSWP
No ACK
ACK
ACK
In case, protect by SWP
In case, Not protect
ACK
PSWP, SWP, CWP
8/19
●Command
○Write Cycle
During WRITE CYCLE operation data is written in the EEPROM. The Byte Write Cycle is used to write only one byte. In
the case of writing continuous data consisting of more than one byte, Page Write is used. The maximum bytes that can
be written at one time is 16 bytes.
S
T
A
R
T
W
R
I
S
T
O
P
SLAVE
T
E
WORD
DATA
ADDRESS
ADDRESS
SDA
LINE
WA
7
WA
0
1
0
1
0 A2A1A0
D7
D0
A
C
K
A
C
K
R
/
A
C
K
W
Fig.33 Byte Write Cycle Timing
S
T
A
R
T
W
R
I
S
T
SLAVE
W ORD
O
P
T
DATA(n)
DATA(n+15)
ADDRESS
ADDRESS(n)
E
SDA
LINE
W A
7
W A
1
0 1 0 A2A1A0
D7
D0
D0
0
A
C
K
R A
A
C
K
A
C
K
/
C
W K
Fig.34 Page Write Cycle Timing
・With this command the data is programmed into the indicated word address.
・When the Master generates a STOP condition, the device begins the internal write cycle to the nonvolatile memory
array.
・Once programming is started no commands are accepted for tWR (5ms max.).
・This device is capable of sixteen-byte Page Write operations.
・If the Master transmits more than sixteen words prior to generating the STOP condition, the address counter will “roll
over” and the previously transmitted data will be overwritten.
・When two or more byte of data are input, the four low order address bits are internally incremented by one after the
receipt of each word, while the four higher order bits of the address (WA7～WA4) remain constant.
9/19
●Command
○Read Cycle
During Read Cycle operation data is read from the EEPROM. The Read Cycle is composed of Random Read Cycle and
Current Read Cycle. The Random Read Cycle reads the data in the indicated address.
The Current Read Cycle reads the data in the internally indicated address and verifies the data immediately after the
Write Operation. The Sequential Read operation can be performed with both Current Read and Random Read. With the
Sequential Read Cycle it is possible to continuously read the next data.
It is necessary to input
“High” at last ACK timing.
W
R
I
S
T
A
R
T
S
T
A
R
T
R
E
A
D
S
T
SLAVE
SLAVE
T
E
W ORD
O
P
DATA(n)
ADDRESS
ADDRESS
ADDRESS(n)
SDA
LINE
W A
7
W A
1
0
1
0 A2A1A0
1
0 1 0 A2A1A0
D7
D0
0
A
C
K
R A
/ C
A
C
K
R A
/
C
W K
W K
Fig.35 Random Read Cycle Timing
S
T
A
R
T
S
T
R
E
A
D
SLAVE
ADDRESS
O
P
It is necessary to input
DATA
“High” at last ACK timing.
SDA
LINE
1
0
1
0 A2A1A0
D7
D0
A
C
K
R
/
A
C
K
W
Fig.36 Current Read Cycle Timing
・ Random Read operation allows the Master to access any memory location indicated by word address.
・ In cases where the previous operation is Random or Current Read (which includes Sequential Read), the internal
address counter is increased by one from the last accessed address (n). Thus Current Read outputs the data of the
next word address (n+1).
・ If an Acknowledge is detected and no STOP condition is generated by the Master (μ-COM), the device will continue to
transmit data. (It can transmit all data (2kbit 256word))
・ If an Acknowledge is not detected, the device will terminate further data transmissions and await a STOP condition
before returning to standby mode.
・ If an Acknowledge is detected with the "Low" level (not "High" level), the command will become Sequential Read, and
the next data will be transmitted. Therefore, the Read command is not terminated. In order to terminate Read input
Acknowledge with "High" always, then input a STOP condition.
S
T
A
R
T
R
E
A
D
S
T
It is necessary to
input “High” at
SLAVE
O
P
DATA(n)
DATA(n+x)
ADDRESS
last ACK timing.
SDA
LINE
1
0
1
A2A1A0
D7
D0
D7
D0
0
A
C
K
R A
A
C
K
A
C
K
/
C
W K
Fig.37 Sequential Read Cycle Timing （With Current Read）
10/19
●Write Protect Cycle
W
R
I
S
T
A
R
T
S
T
W ORD
SLAVE
T
E
O
P
ADDRESS
DATA
ADDRESS
SDA
LINE
0
1
1
A2A1A0
*
*
*
*
0
A
C
K
R A
A
C
K
/
C
W P
W K
*:DON’T CARE
Fig. 38 Permanent Write Protect Cycle
・Permanent set Write Protect command set data of 00h～7Fh in 256 words write protection block. Clear Write Protect
command can cancel write protection block which is set by set write Protect command. Cancel of write protection
block which is set by permanent set Write Protect command at once is impossibility. When these commands are
carried out, WP pin must be OPEN or GND.
・Permanent Set Write Protect command needs tWR from stop condition same as Byete Write and Page Write,
During tWR, input command is canceled.
・Refer to P8/19 about reply of ACK in each protect state.
W
R
I
S
T
A
R
T
S
T
W ORD
SLAVE
T
E
O
P
ADDRESS
ADDRESS
DATA
SDA
LINE
0
1
1
0
0
0 1
*
*
*
*
A
C
K
R A
A
C
K
/
C
W P
W K
*:DON’T CARE
Fig. 39 Set Write Protect Cycle
・Permanent set Write Protect command set data of 00h～7Fh in 256 words write protection block. Clear Write Protect
command can cancel write protection block which is set by set write Protect command. Cancel of write protection
block which is set by permanent set Write Protect command at once is impossibility. When these commands are
carried out, WP pin must be OPEN or GND.
・Permanent Set Protect command needs tWR from stop condition same as Byete Write and Page Write, During tWR,
input command is canceled.
・Refer to P8/19 about reply of ACk in each protect state.
11/19
W
R
I
S
T
A
R
T
S
T
W ORD
SLAVE
T
E
O
P
ADDRESS
DATA
ADDRESS
SDA
LINE
0
1
1
0
0
1 1
*
*
*
*
A
C
K
R A
A
C
K
/
C
W P
W K
*:DON’T CARE
Fig. 40 Clear Write Protect Cycle
・Clear Write Protect command can cancel write protection block which is set by set write Protect command. Cancel
of write protection block which is set by permanent set Write Protect command at once is impossibility. When these
commands are carried out, WP pin must be OPEN or GND.
・Permanent Clear Write Protect command needs tWR from stop condition same as Byete Write and Page Write,
During tWR, input command is canceled.
・Refer to P8/19 about reply of ACk in each protect state.
●Software Reset
Execute software reset in the event that the device is in an unexpected state after power up and/or the command input
needs to be reset. Below are three types（Fig.39 –(a), (b), (c)） of software reset:
During dummy clock, release the SDA BUS (tied to VCC by a pull-up resistor). During this time the device may pull the SDA
line Low for Acknowledge or the outputting of read data.If the Master sets the SDA line to High, it will conflict with the
device output Low, which can cause current overload and result in instantaneous power down, which may damage the
device.
DUMMY CLOCK×14
13
START×2
COMMAND
COMMAND
2
14
1
SCL
SDA
Fig.39-(a) DUMMY CLOCK×14 + START+START
START
START
DUMMY CLOCK×9
1
2
COMMAND
COMMAND
8
9
SCL
SDA
Fig.39-(b) START + DUMMY CLOCK×9 + START
START×9
3
7
COMMAND
COMMAND
2
8
9
1
SCL
SDA
Fig.39-(c) START×9
* COMMAND starts with start condition.
12/19
●Acknowledge polling
Since the IC ignores all input commands during the internal write cycle, no ACK signal will be returned.
When the Master sends the next command after the Write command, if the device returns an ACK signal it means that the
program is completed. No ACK signal indicates that the device is still busy.
Using Acknowledge polling decreases the waiting time by tWR=5ms.
When operating Write or Current Read after Write, first transmit the Slave address (R/W is"High" or "Low"). After the
device returns the ACK signal continue word address input or data output.
During the internal write cycle,
THE FIRST WRITE COMMAND
no ACK will be returned.
(ACK=High)
S
T
A
R
S
T
A
R
T
S
T
A
R
T
S
Ｔ
O
P
A
C
K
H
A
C
K
SLAVE
ADDRESS
SLAVE
ADDRESS
WRITE COMMAND
・・・
T
H
tWR
THE SECOND WRITE COMMAND
S
T
A
R
T
S
T
A
R
T
A
C
K
L
A
C
K
H
A
C
K
L
A
C
K
L
S
Ｔ
O
P
SLAVE
ADDRESS
SLAVE
ADDRESS
WORD
ADDRESS
DATA
・・・
tWR
After the internal write cycle
is completed, ACK will be returned
(ACK=Low). Then input next
Word Address and data.
Fig.40 Successive Write Operation By Acknowledge Polling
●WP effective timing
WP is normally fixed at "H" or "L". However, in case WP needs to be controlled in order to cancel the Write command, pay
attention to “WP effective timing” as follows:
The Write command is canceled by setting WP to "H" within the WP cancellation effective period.
The period from the START condition to the rising edge of the clock (which takes in the data DO - the first byte of the Page
Write data) is the ‘invalid cancellation period’. WP input is considered inconsequential during this period. The setup time
for the rising edge of the SCL, which takes in DO, must be more than 100ns.
The period from the rising edge of SCL (which takes in the data D0) to the end of internal write cycle (tWR) is the ‘effective
cancellation period’. When WP is set to "H" during tWR, Write operation is stopped, making it necessary to rewrite the
data.
It is not necessary to wait for tWR (5ms max.) after stopping the Write command by WP because the device is in standby
mode.
・The rising edge of the clock
which take in D0
・The rising edge
SCL
・of SDA
SCL
SDA
ACK
SDA
D0
D0
ACK
AN ENLARGEMENT
AN ENLARGEMENT
S
T
A
R
T
A
C
K
L
A
C
K
L
A
C
K
L
S
T
A
C
K
L
tWR
SLAVE
ADDRESS
WORD
SDA
WP
DATA
D7 D6 D5
D2 D1 D0
D4 D3
O
P
ADDRESS
WP cancellation
effective period
WP cancellation
invalid period
Stop of the write
operation
Data is not
guaranteed
No data will be written
Fig.41 WP effective timing
13/19
●Command cancellation from the START and STOP conditions
Command input is canceled by successive inputs of START and STOP conditions. (Refer to Fig.42)
However, during ACK or data output, the device may set the SDA line to Low, making operation of the START and STOP
conditions impossible, and thus preventing reset. In this case execute reset by software. (Refer to Fig.39)
The internal address counter will not be determined when operating the Cancel command by the START and STOP
conditions during Random, Sequential or Current Read. Operate a Random Read in this case.
SCL
SDA
1
0
1
0
STOP
CONDITION
START
CONDITION
Fig.42 Command cancellation by the START and STOP conditions during input of the Slave Address
●I/O Circuit
○SDA Pin Pull-up Resistor
A pull-up resistor is required because SDA is an NMOS open drain. Determine the resistor value of (RPU) by considering
the VIL and IL, and VOL-IOL characteristics. If a large RPU is chosen, the clock frequency needs to be slow. A smaller
RPU will result in a larger operating current.
○Maximum RPU
The maximum of RPU can be determined by the following factors.
①The SDA rise time determined by RPU and the capacitance of the BUS line(CBUS) must be less than tR.
In addition, all other timings must be kept within the AC specifications.
②When the SDA BUS is High, the voltage A at the SDA BUS is determined from the total input leakage(IL) of all devices
connected to the BUS. RPU must be higher than the input High level of the microcontroller and the device, including a
noise margin 0.2VCC.
BR34E02
Microcontroller
VCC-ILRPU-0.2 VCC ≧ VIH
RPU
CC IH
IL
0.8V -V
PU
R
∴
≦
SDA PIN
A
Examples: When VCC =3V, IL=10μA, VIH=0.7 VCC
According to ②
IL
IL
0.8×3-0.7×3
RPU
≦
≦
10×10-6
THE CAPACITANCE
OF BUS LINE (CBUS)
Fig.43 I/O Circuit
［kΩ］
300
14/19
○ Minimum RPU
The minimum value of RPU is determined by following factors.
①Meets the condition that VOLMAX=0.4V, IOLMAX=3mA when the output is Low.
CC OL
V
-V
OL
≦ I
PU
R
CC OL
V
-V
PU
∴ R
≧
OL
I
②VOLMAX=0.4V must be lower than the input Low level of the microcontroller and the EEPROM
including the recommended noise margin of 0.1VCC.
VOLMAX ≦ VIL-0.1 VCC
Examples: VCC=3V, VOL=0.4V, IOL=3mA, the VIL of the controller and the EEPROM is VIL=0.3VCC,
3-0.4
According to ①
PU
R
≧
-3
3×10
［Ω］
≧ 867
and
And
VOL=0.4［V］
VIL=0.3×3
=0.9［V］
so that condition ② is met
○SCL Pin Pull-up Resistor
When SCL is controlled by the CMOS output the pull-up resistor at SCL is not required.
However, should SCL be set to Hi-Z, connection of a pull-up resistor between SCL and VCC is recommended.
Several kΩ are recommended for the pull-up resistor in order to drive the output port of the microcontroller.
●A0, A1, A2, WP Pin connections
○ Device Address Pin (A0, A1, A2) connections
The status of the device address pins is compared with the device address sent by the Master. One of the devices that is
connected to the identical BUS is selected. Pull up or down these pins or connect them to VCC or GND. Pins that are not
used as device address (N.C.Pins) may be High, Low, or Hi-Z.
○ WP Pin connection
The WP input allows or prohibits write operations. When WP is High, only Read is available and Write to all address is
prohibited. Both Read and Write are available when WP is Low.
In the event that the device is used as a ROM, it is recommended that the WP input be pulled up or connected to VCC.
When both READ and WRITE are operated, the WP input must be pulled down or connected to GND or controlled.
●Microcontroller connection
○Concerning Rs
The open drain interface is recommended for the SDA port in the I2C BUS. However, if the Tri-state CMOS interface is
applied to SDA, insert a series resistor (Rs) between the SDA pin of the device and the pull up resistor RPU is
recommended, since it will serve to limit the current between the PMOS of the microcontroller, and the NMOS of the
EEPROM. Rs also protects the SDA pin from surges. Therefore, Rs is able to be used though open drain inout of the
SDA port.
ACK
SCL
RPURS
'H'OUTPUT OF
SDA
CONTROLLER
“L” OUTPUT OF EEPROM
The “H” output of controller and the “L” output of
CONTROLLER
EEPROM
EEPROM may cause current overload to SDA line.
Fig.44 I/O Circuit
Fig.45 Input/Output Collision Timing
15/19
○ Rs Maximum
The maximum value of Rs is determined by following factors.
①SDA rise time determined by RPU and the capacitance value of the BUS line (CBUS) of SDA must be less than tR. In
addition, the other timings must be within the timing conditions of the AC.
②When the output from SDA is Low, the voltage of the BUS at
A is determined by RPU, and Rs must be lower than
the input Low level of the microcontroller, including recommended noise margin (0.1VCC).
VCC
(VCC-VOL)×RS
+
VOL+0.1VCC≦VIL
RPU+RS
A
RPU
RS
VOL
VIL-VOL-0.1VCC
1.1VCC-VIL
∴
≦
RS
×
RPU
IOL
BUS
CAPACITANCE
Examples : When VCC=3VꢀVIL=0.3VCCꢀVOL=0.4VꢀRPU=20kΩ
0.3×3-0.4-0.1×3
20×103
≦
According to ② RS
×
VIL
1.1×3-0.3×3
EEPROM
CONTROLLER
≦ 1.67［kΩ］
Fig.46 I/O Circuit
○ Rs Minimum
The minimum value of Rs is determined by the current overload during BUS conflict.
Current overload may cause noises in the power line and instantaneous power down.
The following conditions must be met, where “I” is the maximum permissible current, which depends on the Vcc line
impedance as well as other factors. “I” current must be less than 10mA for EEPROM.
Vcc
≦
I
RS
Vcc
≧
∴
RS
I
RPU
Examples: When VCC=3V, I=10mA
3
"L" OUTPUT
RS
≧
RS
10×10-3
MAXIMUM
CURRENT
"H" OUTPUT
≧ 300［Ω］
CONTROLLER
Fig.47 I/O Circuit
EEPROM
16/19
●I2C BUS Input / Output equivalent circuits
○Input (A0,A2,SCL)
Fig.48 Input Pin Circuit
○Input / Output (SDA)
Fig.49 Input / Output Pin Circuit
○Input (A1)
Fig.50 Input Pin Circuit
○Input (WP)
Fig.51 Input Pin Circuit
17/19
●Power Supply Notes
VCC increases through the low voltage region where the internal circuit of IC and the microcontroller are unstable. In order
to prevent malfunction, the IC has P.O.R and LVCC functionality. During power up, ensure that the following conditions are
met to guaranty P.O.R. and LVCC operability.
1. "SDA='H'" and "SCL='L' or 'H'".
2. Follow the recommended conditions of tR, tOFF, Vbot so that P.O.R. will be activated during power up.
tR
VCC
Recommended conditions of tR, tOFF, Vbot
tR
tOFF
Vbot
Below 10ms Above 10ms Below 0.3V
Below 100ms Above 10ms Below 0.2V
tOFF
Vbot
0
Fig.52 VCC rising wavefrom
3. Prevent SDA and SCL from being "Hi-Z".
In case that condition 1. and/or 2. cannot be met, take following actions.
A） If unable to keep Condition 1 (SDA is "Low" during power up)
→Make sure that SDA and SCL are "High" as in the figure below.
VCC
tLOW
SCL
SDA
After Vcc becomes stable
After Vcc becomes stable
tDH tSU:DAT
tSU:DAT
Fig.53 SCL="H" and SDA="L"
Fig.54 SCL="L" and SDA="L"
B） If unable to keep Condition 2
→After the power stabilizes, execute software reset. (See page 9,10)
C） If unable to keep either Condition 1 or 2
→Follow Instruction A first, then B
●LVCC Circuit
The LVCC circuit prevents Write operation at low voltage and prevents inadvertent writing. A voltage below the LVCC
voltage (1.2V typ.) prohibits Write operation.
●VCC Noise
○Bypass Capacitor
Noise and surges on the power line may cause abnormal function. It is recommended that bypass capacitors (0.1μF) be
attached between VCC and GND externally.
●Cautions On Use
1) Descrived numeric values and data are design representative values, and the values are not guaranteed.
2) We believe that application circuit examples are recommendable, however, in actual use, confirm characteristics
further sufficiently. In the case of use by changing the fixed number of external parts, make your decision with
sufficient margin in consideration of static characteristics and transition characteristics and fluctuations of external
parts and our LSI.
3) Absolute maximum ratings
If the absolute maximum ratings such as impressed voltage and action temperature range and so forth are exceeded,
LSI may be destructed. Do not impress voltage and temperature exceeding the absolute maximum ratings. In the case
of fear exceeding the absolute maximum ratings, take physical safety countermeasures such as fuses, and see to it
that conditions exceeding the absolute maximum ratings should not be impressed to LSI.
4) GND electric potential
Set the voltage of GND terminal lowest at any action condition. Make sure that each terminal voltage is lower than that
of GND terminal.
5) Heat design
In consideration of permissible dissipation in actual use condition, carry out heat design with sufficient margin.
6) Terminal to terminal short circuit and wrong packaging
When to package LSI on to a board, pay sufficient attention to LSI direction and displacement. Wrong packaging
may destruct LSI. And in the case of short circuit between LSI terminals and terminals and power source,
terminal and GND owing to foreign matter, LSI may be destructed.
7) Use in a strong electromagnetic field may cause malfunction, therfore, evaluate design sufficiently.
18/19
●Selection of order type
B
R
3
4
E
0
2
F V T
W
E
2
BUS type
Product type
Package type
Capacity
02=2K
Package specifications
ROHM type
Double Cell
E2:reel shape emboss taping
FVT:TSSOP-B8
NUX:VSON008X2030
TR:reel shape emboss taping
●Package Specifications
TSSOP-B8
<Dimensions>
<Tape and Reel Information>
Embossed carer tape
2500pcs
Tape
Quantity
3.0±0.2
E2
Direction
of feed
8
5
(Pin 1is at the upper left when holding the reel with the left hand while
pulling the tape out towards the right)
1
4
0.15±0.1
0.1
0.22±0.1
(0.52) 0.65
Direction of feed
Pin 1
Reel
※Please order in multiples of the minimum quantity
（Unit:mm)
VSON008X2030
<Dimension>
<Tape and Reel information>
Tape
Embossed carrier tape
Quantity
4000pcs
TR
Direction
of feed
(The direction is the 1pin of product is at the upper light when you hold
reel on the left hand and you pull out the tape on the right hand)
1Pin
Direction of feed
(Unit:mm)
※When you order , please order in times the amount of package quantity.
Reel
Catalog No.05T325Be '05.10 ROHM C 1000 TSU
19/19
Appendix
Notes
No technical content pages of this document may be reproduced in any form or transmitted by any
means without prior permission of ROHM CO.,LTD.
The contents described herein are subject to change without notice. The specifications for the
product described in this document are for reference only. Upon actual use, therefore, please request
that specifications to be separately delivered.
Application circuit diagrams and circuit constants contained herein are shown as examples of standard
use and operation. Please pay careful attention to the peripheral conditions when designing circuits
and deciding upon circuit constants in the set.
Any data, including, but not limited to application circuit diagrams information, described herein
are intended only as illustrations of such devices and not as the specifications for such devices. ROHM
CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any
third party's intellectual property rights or other proprietary rights, and further, assumes no liability of
whatsoever nature in the event of any such infringement, or arising from or connected with or related
to the use of such devices.
Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or
otherwise dispose of the same, no express or implied right or license to practice or commercially
exploit any intellectual property rights or other proprietary rights owned or controlled by
ROHM CO., LTD. is granted to any such buyer.
Products listed in this document are no antiradiation design.
The products listed in this document are designed to be used with ordinary electronic equipment or devices
(such as audio visual equipment, office-automation equipment, communications devices, electrical
appliances and electronic toys).
Should you intend to use these products with equipment or devices which require an extremely high level
of reliability and the malfunction of which would directly endanger human life (such as medical
instruments, transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers
and other safety devices), please be sure to consult with our sales representative in advance.
It is our top priority to supply products with the utmost quality and reliability. However, there is always a chance
of failure due to unexpected factors. Therefore, please take into account the derating characteristics and allow
for sufficient safety features, such as extra margin, anti-flammability, and fail-safe measures when designing in
order to prevent possible accidents that may result in bodily harm or fire caused by component failure. ROHM
cannot be held responsible for any damages arising from the use of the products under conditions out of the
range of the specifications or due to non-compliance with the NOTES specified in this catalog.
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