TC647BEUA [MICROCHIP]
BRUSHLESS DC MOTOR CONTROLLER, PDSO8, PLASTIC, MSOP-8;
| 型号： | TC647BEUA |
| 厂家： | 
MICROCHIP |
| 描述： | BRUSHLESS DC MOTOR CONTROLLER, PDSO8, PLASTIC, MSOP-8 风扇 控制器 |
| 文件： | 总28页 (文件大小：462K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TC647
M
PWM Fan Speed Controller with FanSense™ Technology
Features
Package Types
SOIC/PDIP/MSOP
• Temperature Proportional Fan Speed for Acoustic
Control and Longer Fan Life
V
1
V
V
8
7
6
5
• Efficient PWM Fan Drive
IN
DD
• 3.0V to 5.5V Supply Range:
- Fan Voltage Independent of TC647
Supply Voltage
C
2
3
4
F
OUT
TC647
V
MIN
FAULT
SENSE
- Supports any Fan Voltage
GND
• FanSense™ Technology Fault Detection Circuits
Protect Against Fan Failure and Aid System
Testing
• Shutdown Mode for "Green" Systems
• Supports Low Cost NTC/PTC Thermistors
• Space Saving 8-Pin MSOP Package
General Description
The TC647 is a switch mode, fan speed controller for
use with brushless DC fans. Temperature proportional
speed control is accomplished using pulse width mod-
ulation (PWM). A thermistor (or other voltage output
Applications
• Power Supplies
• Personal Computers
• File Servers
• Telecom Equipment
• UPSs, Power Amps
• General Purpose Fan Speed Control
temperature sensor) connected to V furnishes the
IN
required control voltage of 1.25V to 2.65V (typical) for
0% to 100% PWM duty cycle. Minimum fan speed is
set by a simple resistor divider on the V
input. An
MIN
integrated Start-up Timer ensures reliable motor start-
up at turn-on, coming out of shutdown mode or
following a transient fault. A logic low applied to V
(Pin 3) causes fan shutdown.
MIN
The TC647 also features Microchip Technology's pro-
prietary FanSense™ technology for increasing system
reliability. In normal fan operation, a pulse train is
present at SENSE (Pin 5). A missing pulse detector
monitors this pin during fan operation. A stalled, open
or unconnected fan causes the TC647 to trigger its
Start-up Timer once. If the fault persists, the FAULT
output goes low and the device is latched in its shut-
down mode.
Available Tools
• Fan Controller Demonstration Board (TC642DEMO)
• Fan Controller Evaluation Kit (TC642EV)
The TC647 is available in the 8-pin plastic DIP, SOIC
and MSOP packages and is available in the industrial
and extended commercial temperature ranges.
2002 Microchip Technology Inc.
DS21447C-page 1
TC647
Functional Block Diagram
V
IN
–
V
DD
+
SHDN
–
+
Control
Logic
V
OUT
C
F
3 x T
Timer
PWM
Clock
Generator
FAULT
Start-up
Timer
V
+
MIN
V
SHDN
–
Missing
Pulse
Detect.
TC647
+
–
10kΩ
SENSE
GND
70mV (typ.)
DS21447C-page 2
2002 Microchip Technology Inc.
TC647
*Stresses above those listed under "Absolute Maximum Rat-
ings" may cause permanent damage to the device. These are
stress ratings only and functional operation of the device at
these or any other conditions above those indicated in the
operation sections of the specifications is not implied. Expo-
sure to absolute maximum rating conditions for extended peri-
ods may affect device reliability.
1.0
ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings*
Supply Voltage ......................................................... 6V
Input Voltage, Any Pin.... (GND – 0.3V) to (V +0.3V)
DD
Package Thermal Resistance:
PDIP (R ).............................................125°C/W
θJA
SOIC (R ) ............................................155°C/W
θJA
MSOP (R ) ..........................................200°C/W
θJA
Specified Temperature Range ........... -40°C to +125°C
Storage Temperature Range.............. -65°C to +150°C
DC ELECTRICAL SPECIFICATIONS
Electrical Characteristics: Unless otherwise specified, TMIN < TA < TMAX, VDD = 3.0V to 5.5V.
Symbol
Parameter
Supply Voltage
Supply Current, Operating
Min
Typ
Max
Units
Test Conditions
VDD
IDD
3.0
—
—
0.5
5.5
1
V
mA
Pins 6, 7 Open,
CF = 1 µF, VIN = VC(MAX)
IDD(SHDN)
Supply Current,
Shutdown Mode
VIN, VMIN Input Leakage
—
25
—
—
µA
µA
Pins 6, 7 Open,
CF = 1 µF, VMIN = 0.35V
IIN
– 1.0
+1.0
Note 1
VOUT Output
tR
tF
tSHDN
VOUT Rise Time
VOUT Fall Time
Pulse Width (On VMIN) to Clear
Fault Mode
—
—
30
—
—
—
50
50
—
µsec
µsec
µsec
IOH = 5 mA, Note 1
IOL = 1 mA, Note 1
VSHDN, VHYST
Specifications, Note 1
IOL
IOH
Sink Current at VOUT Output
Source Current at VOUT Output
1.0
5.0
—
—
—
—
mA
mA
VOL = 10% of VDD
VOH = 80% of VDD
VIN, VMIN Inputs
VC(MAX)
Input Voltage at VIN or VMIN for
100% PWM Duty Cycle
2.5
2.65
2.8
V
VC(SPAN)
VSHDN
VC(MAX) - VC(MIN)
Voltage Applied to VMIN to
Ensure Shutdown Mode
1.3
—
1.4
—
1.5
VDD x 0.13
V
V
VREL
Voltage Applied to VMIN to
Release Shutdown Mode
VDD x 0.19
—
—
V
VDD = 5V
Pulse Width Modulator
FPWM
PWM Frequency
26
50
30
70
34
90
Hz
CF = 1.0 µF
SENSE Input
VTH(SENSE)
SENSE Input Threshold
Voltage with Respect to GND
mV
Note 1
FAULT Output
VOL
tMP
tSTARTUP
tDIAG
Output Low Voltage
Missing Pulse Detector Timer
Start-up Timer
—
—
—
—
—
0.3
—
—
V
IOL = 2.5 mA
32/F
32/F
3/F
Sec
Sec
Sec
Diagnostic Timer
—
Note 1: Ensured by design, not tested.
2002 Microchip Technology Inc.
DS21447C-page 3
TC647
2.3
Analog Input (V
)
2.0
PIN DESCRIPTIONS
MIN
An external resistor divider connected to the V
input
The descriptions of the pins are listed in Table 2-1.
MIN
sets the minimum fan speed by fixing the minimum
PWM duty cycle (1.25V to 2.65V = 0% to 100%, typi-
TABLE 2-1:
Pin No. Symbol
PIN FUNCTION TABLE
Description
Analog Input
cal). The TC647 enters shutdown mode when V
≤
MIN
V
. During shutdown, the FAULT output is inactive
SHDN
and supply current falls to 25 µA (typical). The TC647
exits shutdown mode when ≥ V . See
Section 5.0, “Typical Applications”, for more details.
1
2
3
4
5
6
7
8
V
IN
V
MIN
REL
C
Analog Output
Analog Input
F
V
MIN
GND
Ground Terminal
2.4
Ground (GND)
SENSE Analog Input
FAULT Digital (Open Collector) Output
GND denotes the ground terminal.
2.5
Analog Input (SENSE)
V
Digital Output
OUT
V
Power Supply Input
Pulses are detected at the SENSE pin as fan rotation
chops the current through a sense resistor. The
absence of pulses indicates a fault.
DD
2.1
Analog Input (V )
IN
The thermistor network (or other temperature sensor)
2.6
Digital Output (FAULT)
connects to the V input. A voltage range of 1.25V to
IN
2.65V (typical) on this pin drives an active duty cycle of
The FAULT line goes low to indicate a fault condition.
When FAULT goes low due to a fan fault condition, the
device is latched in shutdown mode until deliberately
cleared or until power is cycled. FAULT may be con-
0% to 100% on the V
pin.
OUT
2.2
Analog Output (C )
F
nected to V
if a hard shutdown is desired.
MIN
C is the positive terminal for the PWM ramp generator
F
timing capacitor. The recommended C is 1 µF for
F
2.7
Digital Output (V
)
OUT
is an active high complimentary output that drives
30 Hz PWM operation.
V
OUT
the base of an external NPN transistor (via an appropri-
ate base resistor) or the gate of an N-channel MOS-
FET. This output has asymmetrical drive (see
Section 1.0, “Electrical Characteristics”).
2.8
Power Supply Input (V
)
DD
may be independent of the fan’s power supply
V
DD
(see Section 1.0, “Electrical Characteristics”).
DS21447C-page 4
2002 Microchip Technology Inc.
TC647
3.0
3.1
DETAILED DESCRIPTION
PWM
CAUTION: Shutdown mode is unconditional. That is,
the fan will not be activated regardless of the voltage
at V . The fan should not be shut down until all heat
IN
producing activity in the system is at a negligible
level.
The PWM circuit consists of a ramp generator and
threshold detector. The frequency of the PWM is deter-
mined by the value of the capacitor connected to the C
F
3.5
SENSE Input
input.
A
frequency of 30 Hz is recommended
(FanSense™ Technology)
(C = 1 µF). The PWM is also the time base for the
F
Start-up Timer (see Section 3.3, “Start-Up Timer”). The
PWM voltage control range is 1.25V to 2.65V (typical)
for 0% to 100% output duty cycle.
The SENSE input (Pin 5) is connected to a low value
current sensing resistor in the ground return leg of the
fan circuit. During normal fan operation, commutation
occurs as each pole of the fan is energized. This
causes brief interruptions in the fan current, seen as
pulses across the sense resistor. If the device is not in
shutdown mode, and pulses are not appearing at the
SENSE input, a fault exists.
3.2
The V
VOUT Output
pin is designed to drive a low cost transistor
OUT
or MOSFET as the low side power switching element in
the system. Various examples of driver circuits will be
shown throughout this data sheet. This output has an
asymmetric complimentary drive and is optimized for
driving NPN transistors or N-channel MOSFETs. Since
the system relies on PWM rather than linear control,
the power dissipation in the power switch is kept to a
minimum. Generally, very small devices (TO-92 or SOT
packages) will suffice.
The short, rapid change in fan current (high dI/dt)
causes a corresponding dV/dt across the sense
resistor,
R
.
The waveform on
R
is
SENSE
SENSE
differentiated and converted to a logic-level, pulse-train
by C
and the internal signal processing circuitry.
SENSE
The presence and frequency of this pulse-train is a
direct indication of fan operation. See Section 5.0,
“Typical Applications”, for more details.
3.3
Start-Up Timer
3.6
FAULT Output
To ensure reliable fan start-up, the Start-up Timer turns
the V
output on for 32 cycles of the PWM whenever
Pulses appearing at SENSE due to the PWM turning
on are blanked with the remaining pulses being filtered
by a missing pulse detector. If consecutive pulses are
OUT
the fan is started from the off state. This occurs at
power up and when coming out of shutdown mode. If
the PWM frequency is 30 Hz (C = 1 µF), the resulting
not detected for 32 PWM cycles ( 1 Sec if C = 1 µF),
F
F
OUT
start-up time will be approximately one second. If a
fault is detected, the Diagnostic Timer is triggered
once, followed by the Start-up Timer. If the fault
persists, the device is shut down (see Section 3.6,
“FAULT Output”).
the Diagnostic Timer is activated and V
is driven
high continuously for three PWM cycles ( 100 msec if
C = 1 µF). If a pulse is not detected within this window,
F
the Start-up Timer is triggered (see Section 3.3, “Start-
Up Timer”). This should clear a transient fault condition.
If the missing pulse detector times out again, the PWM
is stopped and FAULT goes low. When FAULT is
activated due to this condition, the device is latched in
shutdown mode and will remain off indefinitely.
3.4
Shutdown Control (Optional)
If V
(Pin 3) is pulled below V
, the TC647 will go
MIN
SHDN
into shutdown mode. This can be accomplished by
driving V with an open-drain logic signal or using an
MIN
Note: At this point, action must be taken to restart
external transistor, as shown in Figure 3-1. All functions
are suspended until the voltage on V becomes
the fan by momentarily pulling V
SHDN
below
MIN
MIN
V
, or cycling system power. In either
higher than V
(0.85V @ V
= 5.0V). Pulling V
DD MIN
REL
case, the fan cannot remain disabled due
to a fault condition as severe system dam-
age could result. If the fan cannot be
restarted, the system should be shut down.
below V
will always result in complete device
SHDN
shutdown and reset. The FAULT output is
unconditionally inactive in shutdown mode.
A small amount of hysteresis, typically one percent of
The TC647 may be configured to continuously attempt
fan restarts, if so desired.
V
V
V
(50 mV at V = 5.0V), is designed into the V
/
SHDN
DD
REL
REL
DD
threshold. The levels specified for V
and
SHDN
in Section 1.0, “Electrical Characteristics”,
include this hysteresis plus adequate margin to
account for normal variations in the absolute value of
the threshold and hysteresis.
2002 Microchip Technology Inc.
DS21447C-page 5
TC647
Continuous restart mode is enabled by connecting the
condition. Normal fan start-up is then attempted as pre-
viously described. The FAULT output may be
connected to external logic (or the interrupt input of a
microcontroller) to shut the TC647 down if multiple fault
pulses are detected at approximately one second
intervals.
FAULT output to V
through a 0.1 µF capacitor, as
MIN
shown in Figure 3-1. When so connected, the TC647
automatically attempts to restart the fan whenever a
fault condition occurs. When the FAULT output is
driven low, the V
SHDN
input is momentarily pulled below
MIN
V
, initiating a reset and clearing the fault
+5V
10 kΩ
C
1
+5V
8
0.01µF
+12V
1 kΩ
C
1µF
TC647
RESET
B
Fan
From
Temp
Sensor
1
V
DD
6
V
1
0
IN
FAULT
Q
1
+5V
Fault
Detected
R
BASE
TC647
R
3
7
5
V
OUT
3
2
V
MIN
C
B
SENSE
R
1
0.01 µF
From
System
C
SENSE
Q
2
C
F
R
SENSE
R
4
C
F
Shutdown
Controller
GND
4
(Optional)
1 µF
Note: The parallel combination of R and R must be >10 kΩ.
3
4
FIGURE 3-1:
Fan Fault Output Circuit.
DS21447C-page 6
2002 Microchip Technology Inc.
TC647
4.3
Fan Fault
4.0
SYSTEM BEHAVIOR
Fan Fault is an infinite loop wherein the TC647 is
The flowcharts describing the TC647’s behavioral
algorithm are shown in Figure 4-1. They can be
summarized as follows:
latched in shutdown mode. This mode can only be
released by a reset (i.e., V
SHDN
being brought below
MIN
V
, then above V
, or by power cycling).
REL
4.1
Power-Up
(1) While in this state, FAULT is latched on (low) and
the V output is disabled.
OUT
(1) Assuming the device is not being held in shutdown
mode (V > V )…
(2) A reset sequence applied to the V
the loop to Power-up.
pin will exit
MIN
REL
MIN
(2) Turn V
output on for 32 cycles of the PWM
OUT
clock. This ensures that the fan will start from a
dead stop.
(3) End.
(3) During this Start-up Timer, if a fan pulse is
detected, branch to Normal Operation; if none are
received…
(4) Activate the 32-cycle Start-up Timer one more time
and look for fan pulse; if a fan pulse is detected,
proceed to Normal Operation; if none are
received…
(5) Proceed to Fan Fault.
(6) End.
4.2
Normal Operation
Normal Operation is an endless loop which may only
be exited by entering shutdown mode or Fan Fault. The
loop can be thought of as executing at the frequency of
the oscillator and PWM.
(1) Reset the missing pulse detector.
(2) Is TC647 in shutdown? If so…
a. V
duty cycle goes to zero.
OUT
b. FAULT is disabled.
c. Exit the loop and wait for V
> V
to resume
REL
MIN
operation (indistinguishable from Power-up).
(3) Drive V
to a duty cycle proportional to greater
OUT
of V and V
on a cycle by cycle basis.
MIN
IN
(4) If a fan pulse is detected, branch back to the start
of the loop (1).
(5) If the missing pulse detector times out …
(6) Activate the 3-cycle Diagnostic Timer and look for
pulses; if a fan pulse is detected, branch back to
the start of the loop (1); if none are received…
(7) Activate the 32-cycle Start-up Timer and look for
pulses; if a fan pulse is detected, branch back to
the start of the loop (1); if none are received…
(8) Quit Normal Operation and go to Fan Fault.
(9) End.
2002 Microchip Technology Inc.
DS21447C-page 7
TC647
Normal
Operaton
Power-Up
Clear
Missing Pulse
Detector
Power-on
Reset
FAULT = 1
Yes
< V
SHDN
Shutdown
= 0
V
MIN
V
OUT
Yes
Shutdown
= 0
V
< V
?
SHDN
MIN
No
V
No
OUT
V
V
?
REL
>
MIN
No
V
> V
REL
MIN
No
Yes
Fire Start-up
Timer
(1 SEC)
Yes
Power-up
Fire Start-up
Timer
(1 SEC)
Yes
Yes
Fan Fault
Detected?
Fan Pulse
Detected?
No
V
OUT
Proportional to Greater
of V
Normal
Operation
No
V
or
IN
MIN
Fan Fault
Yes
No
Fan Pulse
Detected?
M.P.D.
Expired?
Fan Fault
No
Yes
Fire Diagnostic
Timer
(100msec)
FAULT = 0,
= 0
V
OUT
No
Fan Pulse
Detected?
Fire Start-up
Timer
(1 SEC)
Yes
No
Cycling
Power?
No
V
< V
?
SHDN
MIN
Yes
Fan Pulse
Detected?
Yes
Yes
No
No
V
> V
REL
?
MIN
Fan Fault
Yes
Power-up
FIGURE 4-1:
TC647 Behavioral Algorithm Flowchart.
DS21447C-page 8
2002 Microchip Technology Inc.
TC647
The TC642 demonstration and prototyping board
(TC642DEMO) and the TC642 Evaluation Kit
(TC642EV) provide working examples of TC647 cir-
cuits and prototyping aids. The TC642DEMO is a
printed circuit board optimized for small size and ease
of inclusion into system prototypes. The TC642EV is a
larger board intended for benchtop development and
analysis. At the very least, anyone contemplating a
design using the TC647 should consult the documen-
tation for both TC642EV and (DS21403) and
TC642DEMO (DS21401). Figure 5-1 shows the base
schematic for the TC642DEMO.
5.0
TYPICAL APPLICATIONS
Designing with the TC647 involves the following:
(1) The temp sensor network must be configured to
deliver 1.25V to 2.65V on V for 0% to 100% of
IN
the temperature range to be regulated.
(2) The minimum fan speed (V ) must be set.
(3) The output drive transistor and associated circuitry
must be selected.
MIN
(4) The SENSE network, R
and C
, must
SENSE
SENSE
be designed for maximum efficiency while
delivering adequate signal amplitude.
(5) If shutdown capability is desired, the drive require-
ments of the external signal or circuit must be
considered.
+5V*
+12V
C
B
1 µF
NTC
R
1
8
Fan
1
V
V
DD
IN
C
B
0.01 µF
Fan Fault
Shutdown
6
R
2
Q
FAULT
1
R
BASE
TC647
7
V
OUT
R
3
3
V
MIN
5
C
B
0.01 µF
SENSE
2
Shutdown
C
SENSE
C
F
R
4
R
SENSE
C
1 µF
GND
4
F
(Optional)
Note: *See cautions regarding latch-up considerations in Section 5.0, "Typical Applications".
FIGURE 5-1:
Typical Application Circuit.
2002 Microchip Technology Inc.
DS21447C-page 9
TC647
EQUATION
5.1
Temperature Sensor Design
V
x R
2
The temperature signal connected to V must output a
DD
IN
= V(T )
1
voltage in the range of 1.25V to 2.65V (typical) for 0%
to 100% of the temperature range of interest. The
circuit in Figure 5-2 illustrates a convenient way to
provide this signal.
R
(T ) + R
1 2
TEMP
V
x R
2
DD
= V(T )
2
R
(T ) + R
2 2
TEMP
V
DD
Where T and T are the chosen temperatures and
1
2
R
is the parallel combination of the thermistor
TEMP
and R .
I
1
DIV
These two equations facilitate solving for the two
unknown variables, R and R . More information about
1
2
Thermistors may be obtained from AN679, “Tempera-
ture Sensing Technologies”, and AN685, “Thermistors
in Single Supply Temperature Sensing Circuits”, which
can be downloaded from Microchip’s website at
www.microchip.com.
RT
NTC
Thermistor
R
R
= 100 kΩ
1
1
2
100 kΩ @ 25ºC
V
IN
5.2
Minimum Fan Speed
= 23.2 kΩ
A voltage divider on V
sets the minimum PWM duty
MIN
cycle and, thus, the minimum fan speed. As with the
V
input, 1.25V to 2.65V corresponds to 0% to 100%
IN
FIGURE 5-2:
Temperature Sensing
duty cycle. Assuming that fan speed is linearly related
to duty cycle, the minimum speed voltage is given by
the equation:
Circuit.
Figure 5-2 illustrates a simple temperature dependent
voltage divider circuit. RT is a conventional 100 kΩ @
1
EQUATION
25°C NTC thermistor, while R and R are standard
1
2
resistors. The supply voltage, V , is divided between
DD
Minimum Speed
x (1.4V) + 1.25V
R and the parallel combination of RT and R (for con-
2
1
1
V
=
MIN
Full Speed
venience, the parallel combination of RT and R will
1
1
be referred to as R
). The resistance of the ther-
TEMP
For example, if 2500 RPM equates to 100% fan speed,
and a minimum speed of 1000 RPM is desired, then
mistor at various temperatures is obtained from the
manufacturer’s specifications. Thermistors are often
referred to in terms of their resistance at 25°C. Gener-
ally, the thermistor shown in Figure 5-2 is a non-linear
device with a negative temperature coefficient (also
the V
voltage is:
MIN
EQUATION
called an NTC thermistor). In Figure 5-2, R is used to
1
1000
2500
x (1.4V) + 1.25V = 1.81V
V
=
linearize the thermistor temperature response and R
MIN
2
is used to produce a positive temperature coefficient at
the V node. As an added benefit, this configuration
IN
The V
voltage may be set using a simple resistor
MIN
produces an output voltage delta of 1.4V, which is well
divider as shown in Figure 5-3. Per Section 1.0,
“Electrical Characteristics”, the leakage current at the
within the range of the V
specification of the
C(SPAN)
TC647. A 100 kΩ NTC thermistor is selected for this
application in order to keep I at a minimum.
V
pin is no more than 1 µA. It would be very
MIN
DIV
conservative to design for a divider current, I , of
DIV
For the voltage range at V to be equal to 1.25V to
IN
100 µA. If V = 5.0V then;
DD
2.65V, the temperature range of this configuration is
0°C to 50°C. If a different temperature range is required
EQUATION
from this circuit, R should be chosen to equal the
1
resistance value of the thermistor at the center of this
new temperature range. It is suggested that a maxi-
mum temperature range of 50°C be used with this cir-
cuit due to thermistor linearity limitations. With this
5.0V
–4
I
= 1e A =
, therefore
DIV
R + R
1
2
5.0V
1e A
R + R =
= 50,000 Ω = 50 kΩ
1
2
–4
change, R is adjusted according to the following
2
equations:
DS21447C-page 10
2002 Microchip Technology Inc.
TC647
V
output is “off” most of the time. The fan may be
OUT
V
DD
rotating normally, but the commutation events are
occurring during the PWM’s off-time.
The phase relationship between the fan’s commutation
and the PWM edges tends to “walk around” as the
system operates. At certain points, the TC647 may fail
to capture a pulse within the 32-cycle missing pulse
detector window. When this happens, the 3-cycle
R
1
I
IN
Diagnostic Timer will be activated, the V
output will
OUT
I
V
DIV
MIN
be active continuously for three cycles and, if the fan is
operating normally, a pulse will be detected. If all is
well, the system will return to normal operation. There
is no harm in this behavior, but it may be audible to the
user as the fan will accelerate briefly when the
Diagnostic Timer fires. For this reason, it is
R
2
recommended that V
be set no lower than 1.8V.
MIN
GND
5.4
FanSense™ Network
(RSENSE and CSENSE
FIGURE 5-3:
V
Circuit.
MIN
)
We can further specify R and R by the condition that
1
2
the divider voltage is equal to our desired V . This
The FanSense network, comprised of R
and
MIN
SENSE
yields the following equation:
C
, allows the TC647 to detect commutation of
SENSE
the fan motor (FanSense™ technology). This network
can be thought of as a differentiator and threshold
EQUATION
detector. The function of R
current into a voltage. C
is to convert the fan
SENSE
SENSE
V
x R
2
DD
serves to AC-couple this
V
=
MIN
voltage signal and provide a ground referenced input to
the SENSE pin. Designing a proper SENSE network is
R + R
1
2
simply a matter of scaling R
to provide the
SENSE
Solving for the relationship between R and R results
in the following equation:
1
2
necessary amount of gain (i.e., the current-to-voltage
conversion ratio). A 0.1 µF ceramic capacitor is recom-
mended for C
. Smaller values require larger
SENSE
EQUATION
sense resistors, and higher value capacitors are bulkier
and more expensive. Using a 0.1 µF results in
V
- V
DD
MIN
R = R x
1
2
reasonable values for R
. Figure 5-4 illustrates a
SENSE
V
MIN
typical SENSE network. Figure 5-5 shows the
waveforms observed using a typical SENSE network.
In this example, R = (1.762) R . Substituting this rela-
tionship back into the previous equation yields the
resistor values:
1
2
V
DD
R = 18.1 kΩ
2
R = 31.9 kΩ
1
In this case, the standard values of 31.6 kΩ and
18.2 kΩ are very close to the calculated values and
would be more than adequate.
FAN
R
5.3
Operations at Low Duty Cycle
BASE
V
OUT
Q
1
One boundary condition which may impact the selec-
tion of the minimum fan speed is the irregular activation
of the Diagnostic Timer due to the TC647 “missing” fan
commutation pulses at low speeds. This is a natural
consequence of low PWM duty cycles (typically 25% or
less). Recall that the SENSE function detects commu-
tation of the fan as disturbances in the current through
SENSE
C
SENSE
(0.1 µF Typ.)
R
SENSE
R
. These can only occur when the fan is ener-
SENSE
GND
gized (i.e., V
is “on”). At very low duty cycles, the
OUT
FIGURE 5-4:
SENSE Network.
2002 Microchip Technology Inc.
DS21447C-page 11
TC647
5.5
Output Drive Transistor Selection
Tek Run: 10.0kS/s Sample
The TC647 is designed to drive an external transistor
[
T
]
or MOSFET for modulating power to the fan. This is
shown as Q in Figures 3-1, 5-1, 5-4, 5-6, 5-7, 5-8
1
and 5-9. The V
pin has a minimum source current
OUT
of 5 mA and a minimum sink current of 1 mA. Bipolar
transistors or MOSFETs may be used as the power
switching element, as shown in Figure 5-7. When high
current gain is needed to drive larger fans, two transis-
tors may be used in a Darlington configuration. These
circuit topologies are shown in Figure 5-7: (a) shows a
single NPN transistor used as the switching element;
(b) illustrates the Darlington pair; and (c) shows an N-
channel MOSFET.
Waveform @ Sense Resistor
Waveform @ Sense Pin
GND
1
2
90mV
50mV
GND
T
One major advantage of the TC647’s PWM control
scheme versus linear speed control is that the power
dissipation in the pass element is kept very low. Gener-
ally, low cost devices in very small packages, such as
TO-92 or SOT, can be used effectively. For fans with
nominal operating currents of no more than 200 mA, a
single transistor usually suffices. Above 200 mA, the
Darlington or MOSFET solution is recommended. For
the fan sensing function to work correctly, it is impera-
tive that the pass transistor be fully saturated when
“on”.
Table 5-2 gives examples of some commonly available
transistors and MOSFETs. This table should be used
as a guide only since there are many transistors and
MOSFETs which will work just as well as those listed.
The critical issues when choosing a device to use as
100mV
M5.00ms
142mV
Ch1
Ch2
100mV
Ch1
FIGURE 5-5:
SENSE Waveforms.
Table 5-1 lists the recommended values of R
SENSE
based on the nominal operating current of the fan. Note
that the current draw specified by the fan manufacturer
may be a worst-case rating for near-stall conditions and
not the fan’s nominal operating current. The values in
Table 5-1 refer to actual average operating current. If
the fan current falls between two of the values listed,
use the higher resistor value. The end result of employ-
ing Table 5-1 is that the signal developed across the
sense resistor is approximately 450 mV in amplitude.
TABLE 5-1:
Nominal Fan Current (mA)
RSENSE VS. FAN CURRENT
Q
V
are: (1) the breakdown voltage (V
or
1
DS
(BR)CEO
(MOSFET)) must be large enough to withstand the
R
(Ω)
SENSE
9.1
4.7
3.0
2.4
2.0
1.8
1.5
1.3
1.2
1.0
highest voltage applied to the fan (Note: This will occur
when the fan is off); (2) 5 mA of base drive current must
be enough to saturate the transistor when conducting
the full fan current (transistor must have sufficient
50
100
150
200
250
300
350
400
450
500
gain); (3) the V
voltage must be high enough to suf-
OUT
ficiently drive the gate of the MOSFET to minimize the
R
of the device; (4) rated fan current draw must
DS(on)
be within the transistor's/MOSFET's current handling
capability; and (5) power dissipation must be kept
within the limits of the chosen device.
A base-current limiting resistor is required with bipolar
transistors. This is shown in Figure 5-6.
DS21447C-page 12
2002 Microchip Technology Inc.
TC647
The correct value for this resistor can be determined as
follows:
V
DD
V
V
V
= VRSENSE + V
+ V
RBASE
OH
BE(SAT)
x R
SENSE
= I
RSENSE
RBASE
BASE
FAN
= R
= I
x I
BASE
BASE
/ h
FAN FE
Fan
I
V
is specified as 80% of V
in Section 1.0,
DD
OH
“Electrical Characteristics”; V
is given in the cho-
BE(SAT)
R
BASE
sen transistor data sheet. It is now possible to solve for
R
V
= 80% V
DD
OH
Q
R
1
.
–
+
BASE
V
R
BASE
–
+
V
BE
(SAT)
EQUATION
+
V
R
V
- V
- V
SENSE
–
SENSE
OH
BE(SAT) RSENSE
R
=
BASE
I
BASE
Some applications require the fan to be powered from the
negative 12V supply to keep motor noise out of the
positive voltage power supplies. As shown in Figure 5-8,
GND
FIGURE 5-6:
BASE
Circuit For Determining
R
.
zener diode D offsets the -12V power supply voltage,
1
holding transistor Q off when V
is low. When V
1
is
OUT
1
OUT
OUT
high, the voltage at the anode of D increases by V
causing Q to turn on. Operation is otherwise the same as
1
the case of fan operation from +12V.
TABLE 5-2:
Device
TRANSISTORS AND MOSFETS FOR Q (V = 5V)
1
DD
Max. V
/V
V
/V
Fan Current
(mA)
Suggested
BE(sat) GS
CEO DS
Package
Min. H
FE
(V)
(V)
R
(Ω)
BASE
800
800
301
Note 1
Note 1
Note 1
Note 1
MMBT2222A
MPS2222A
MPS6602
SI2302
MGSF1N02E
SI4410
SOT-23
TO-92
TO-92
SOT-23
SOT-23
SO-8
1.2
1.2
1.2
2.5
2.5
4.5
4.5
50
50
50
NA
NA
NA
NA
40
40
40
20
20
30
60
150
150
500
500
500
1000
500
SI2308
SOT-23
Note 1: A series gate resistor may be used in order to control the MOSFET turn-on and turn-off times.
2002 Microchip Technology Inc.
DS21447C-page 13
TC647
V
V
DD
V
DD
DD
Fan
Fan
Fan
R
BASE
R
BASE
V
OUT
Q
1
V
Q
R
OUT
1
Q
R
V
1
OUT
Q
2
SENSE
SENSE
R
SENSE
GND
GND
GND
b) Darlington Transistor Pair
a) Single Bipolar Transistor
C) N-Channel MOSFET
FIGURE 5-7:
Output Drive Transistor Circuit Topologies.
ing points can result in enough parasitic capacitance
and/or inductance in the power supply connections to
delay one power supply “routing” versus another.
+5V
V
DD
R
*
2
2.2 kΩ
5.7
Power Supply Routing and
Bypassing
V
OUT
Fan
Q
D
1
TC647
12.0V
Zener
Noise present on the V and V
inputs may cause
IN
MIN
*
erroneous operation of the FAULT output. As a result,
these inputs should be bypassed with a 0.01 µF capac-
itor mounted as close to the package as possible. This
1
GND
R
*
R
2.2 Ω
*
4
3
10 kΩ
is particularly true of V , which is usually driven from a
IN
high impedance source (such as a thermistor). In addi-
tion, the V
input should be bypassed with a 1 µF
DD
-12V
*Note: Value depends on the specific application and is shown for example only.
capacitor. Ground should be kept as short as possible.
To keep fan noise off the TC647 ground pin, individual
ground returns for the TC647 and the low side of the
fan current sense resistor should be used.
FIGURE 5-8:
Powering the Fan from a
-12V Supply.
Design Example
5.6
Latch-Up Considerations
Step 1. Calculate R and R based on using an NTC
1
2
having a resistance of 10 kΩ at T
(25°C)
MIN
As with any CMOS IC, the potential exists for latch-up
if signals are applied to the device which are outside
the power supply range. This is of particular concern
during power-up if the external circuitry (such as the
and 4.65 kΩ at T
(45°C) (see Figure 5-9).
MAX
R = 20.5 kΩ
1
R = 3.83 kΩ
2
sensor network, V
divider or shutdown circuit) is
Step 2. Set minimum fan speed V
= 1.8V.
MIN
MIN
powered by a supply different from that of the TC647.
Limit the divider current to 100 µA from which
Care should be taken to ensure that the TC647’s V
R = 33 kΩ and R = 18 kΩ
DD
5
6
supply powers up first. If possible, the networks
Step 3. Design the output circuit.
attached to V and V
should connect to the V
DD
IN
MIN
Maximum fan motor current = 250 mA.
supply at the same physical location as the IC itself.
Even if the IC and any external networks are powered
by the same supply, physical separation of the connect-
Q beta is chosen at 50 from which
1
R = 800Ω.
7
DS21447C-page 14
2002 Microchip Technology Inc.
TC647
+5V
+5V
+12V
Fan
+
NTC
10 kΩ
@ 25°C
1
C
B
R
1
1 µF
20.5 kΩ
8
4
V
DD
V
GND
IN
C
B
R
2
0.01 µF
System
Fault
6
3.83 kΩ
Q
FAULT
1
+5V
R
800 Ω
7
TC647
7
5
V
OUT
R
33 kΩ
5
3
V
MIN
C
B
0.01 µF
2
SENSE
C
Fan Shutdown
SENSE
0.1 µF
Q
2
R
6
18 kΩ
C
F
R
10 kΩ
R
SENSE
8
2.2 Ω
C
1 µF
1
(Optional)
FIGURE 5-9:
Design Example.
5.8
TC647 as a Microcontroller
Peripheral
In a system containing a microcontroller or other host
intelligence, the TC647 can be effectively managed as
a CPU peripheral. Routine fan control functions can be
performed by the TC647 without controller intervention.
The microcontroller receives temperature data from one
or more points throughout the system. It calculates a fan
operating speed based on an algorithm specifically
designed for the application at hand. The processor
controls fan speed using complimentary port bits I/O1
through I/O3. Resistors R through R (5% tolerance)
1
6
form a crude 3-bit DAC that translates the 3-bit code
from the controller or processor's outputs into a 1.6V DC
control signal. A monolithic DAC or digital pot may be
used instead of the circuit shown in Figure 5-10.
With V
set to 1.8V, the TC647 has a minimum
MIN
operating speed of approximately 40% of full rated
speed when the processor's output code is 000[B].
Output codes 001[B] to 111[B] operate the fan from
roughly 40% to 100% of full speed. An open-drain
output from the processor I/O can be used to reset the
TC647 following detection of a fault condition. The
FAULT output can be connected to the processor's
interrupt input, or to an I/O pin, for polled operation (see
Figure 5-10).
2002 Microchip Technology Inc.
DS21447C-page 15
TC647
+12V
Fan
+5V
Open-drain
Outputs
(Optional)
(RESET)
(MSB)
I/O0
+5V
R
1
8
110 kΩ
1
2
I/O1
I/O2
I/O3
V
IN
V
DD
+
C
B
R
2
240 kΩ
C
.01 µF
B
Analog or Digital
Temperature
Data from one or
more Sensors
1 µF
R
800Ω
CMOS
Outputs
9
7
C
V
R
3
360 kΩ
F
OUT
2N2222A
+
+5V
TC647
1 µF
R
R
10
R
18 kΩ
7
(LSB)
4
CMOS
Microcontroller
33 kΩ
+5V
18 kΩ
10 kΩ
3
6
5
R
5
V
MIN
FAULT
1.5 kΩ
C
B
R
+5V
8
.01 µF
0.1 µF
4
R
6
SENSE
GND
1 kΩ
R
11
2.2Ω
GND
INT
FIGURE 5-10:
TC647 as a Microcontroller Peripheral.
DS21447C-page 16
2002 Microchip Technology Inc.
TC647
6.0
6.1
PACKAGING INFORMATION
Package Marking Information
8-Lead PDIP (300 mil)
Example:
XXXXXXXX
NNN
TC647VPA
025
YYWW
0215
8-Lead SOIC (150 mil)
Example:
XXXXXXXX
YYWW
TC647VOA
0215
NNN
025
Example:
8-Lead MSOP
TC647E
XXXXXX
YWWNNN
215025
Legend: XX...X Customer specific information*
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 marking consists of Microchip part number, year code, week code, traceability code (facility
code, mask rev#, and assembly code). For marking beyond this, certain price adders apply. Please check
with your Microchip Sales Office.
2002 Microchip Technology Inc.
DS21447C-page 17
TC647
8-Lead Plastic Dual In-line (P) – 300 mil (PDIP)
E1
D
2
n
1
α
E
A2
A
L
c
A1
β
B1
B
p
eB
Units
Dimension Limits
INCHES*
NOM
MILLIMETERS
MIN
MAX
MIN
NOM
8
MAX
n
p
A
A2
A1
E
E1
D
L
c
B1
B
Number of Pins
Pitch
Top to Seating Plane
Molded Package Thickness
Base to Seating Plane
Shoulder to Shoulder Width
Molded Package Width
Overall Length
Tip to Seating Plane
Lead Thickness
Upper Lead Width
Lower Lead Width
Overall Row Spacing
Mold Draft Angle Top
Mold Draft Angle Bottom
8
.100
.155
.130
2.54
3.94
3.30
.140
.170
.145
3.56
2.92
4.32
3.68
.115
.015
.300
.240
.360
.125
.008
.045
.014
.310
5
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
§
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
DS21447C-page 18
2002 Microchip Technology Inc.
TC647
8-Lead Plastic Small Outline (SN) – Narrow, 150 mil (SOIC)
E
E1
p
D
2
B
n
1
h
α
45×
c
A2
A
f
β
L
A1
Units
INCHES*
NOM
MILLIMETERS
Dimension Limits
MIN
MAX
MIN
NOM
8
MAX
n
p
A
A2
A1
E
E1
D
h
L
f
Number of Pins
Pitch
Overall Height
8
.050
.061
.056
.007
.237
.154
.193
.015
.025
4
1.27
.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
1.55
0.25
6.20
3.99
5.00
0.51
0.76
8
Molded Package Thickness
Standoff
.052
.004
.228
.146
.189
.010
.019
0
.061
.010
.244
.157
.197
.020
.030
8
§
0.10
5.79
3.71
4.80
0.25
0.48
0
Overall Width
Molded Package Width
Overall Length
Chamfer Distance
Foot Length
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
2002 Microchip Technology Inc.
DS21447C-page 19
TC647
6.2
8-Lead Plastic Micro Small Outline Package (MS) (MSOP)
E
p
E1
D
2
1
B
n
α
A2
A
c
φ
A1
(F)
L
β
Units
Dimension Limits
INCHES
NOM
MILLIMETERS*
NOM
MIN
MAX
MIN
MAX
8
n
p
Number of Pins
Pitch
8
.026
0.65
Overall Height
Molded Package Thickness
A
A2
A1
E
E1
D
.044
1.18
.030
.034
.038
.006
.200
.122
.122
.028
.039
0.76
0.05
0.86
0.97
0.15
.5.08
3.10
3.10
0.70
1.00
Standoff
§
.002
.184
.114
.114
.016
.035
Overall Width
Molded Package Width
Overall Length
Foot Length
Footprint (Reference)
Foot Angle
.193
.118
.118
.022
.037
4.90
3.00
3.00
0.55
0.95
4.67
2.90
2.90
0.40
0.90
L
F
φ
0
6
0
6
c
Lead Thickness
Lead Width
Mold Draft Angle Top
Mold Draft Angle Bottom
.004
.010
.006
.012
.008
.016
0.10
0.25
0.15
0.30
0.20
0.40
B
α
β
7
7
7
7
*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.
Drawing No. C04-111
DS21447C-page 20
2002 Microchip Technology Inc.
TC647
6.3
Taping Form
Component Taping Orientation for 8-Pin SOIC (Narrow) Devices
User Direction of Feed
PIN 1
W
P
Standard Reel Component Orientation
for TR Suffix Device
Carrier Tape, Number of Components Per Reel and Reel Size
Package
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
8-Pin SOIC (N)
12 mm
8 mm
2500
13 in
Component Taping Orientation for 8-Pin MSOP Devices
User Direction of Feed
PIN 1
W
P
Standard Reel Component Orientation
for TR Suffix Device
Carrier Tape, Number of Components Per Reel and Reel Size
Package
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
8-Pin MSOP
12 mm
8 mm
2500
13 in
2002 Microchip Technology Inc.
DS21447C-page 21
TC647
NOTES:
DS21447C-page 22
2002 Microchip Technology Inc.
TC647
ON-LINE SUPPORT
Microchip provides on-line support on the Microchip
World Wide Web site.
SYSTEMS INFORMATION AND
UPGRADE HOT LINE
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 the most current upgrade kits.The Hot Line
Numbers are:
1-800-755-2345 for U.S. and most of Canada, and
1-480-792-7302 for the rest of the world.
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
Internet Explorer. Files are also available for FTP
download from our FTP site.
ConnectingtotheMicrochipInternetWebSite
The Microchip web site is available at the following
URL:
092002
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
• Links to other useful web sites related to
Microchip Products
• Conferences for products, Development Systems,
technical information and more
• Listing of seminars and events
2002 Microchip Technology Inc.
DS21447C-page23
TC647
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.
Please list the following information, and use this outline to provide us with your comments about this document.
To:
Technical Publications Manager
Reader Response
Total Pages Sent ________
RE:
From:
Name
Company
Address
City / State / ZIP / Country
Telephone: (_______) _________ - _________
FAX: (______) _________ - _________
Application (optional):
Would you like a reply?
Y
N
Literature Number:
DS21447C
Device:
TC647
Questions:
1. What are the best features of this document?
2. How does this document meet your hardware and software development needs?
3. Do you find the organization of this document easy to follow? If not, why?
4. What additions to the document do you think would enhance the structure and subject?
5. What deletions from the document could be made without affecting the overall usefulness?
6. Is there any incorrect or misleading information (what and where)?
7. How would you improve this document?
DS21447C-page24
2002 Microchip Technology Inc.
TC647
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.
PART NO.
Device
X
/XX
Examples:
Temperature Package
Range
a)
b)
c)
d)
TC647VOA: PWM Fan Speed Controller w/
Fault Detection, SOIC package.
TC647VUA: PWM Fan Speed Controller w/
Fault Detection, MSOP package.
TC647VPA: PWM Fan Speed Controller w/
Fault Detection, PDIP package.
TC647EOATR: PWM Fan Speed Controller
w/Fault Detection, SOIC package, Tape and
Reel.
Device:
TC647:
PWM Fan Speed Controller w/Fault Detection
Temperature Range:
Package:
V
E
=
=
0°C to +85°C
-40°C to +85°C
PA
OA
UA
=
=
=
Plastic DIP (300 mil Body), 8-lead *
Plastic SOIC, (150 mil Body), 8-lead
Plastic Micro Small Outline (MSOP), 8-lead
* PDIP package is only offered in the V temp range
Sales and Support
Data Sheets
Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recom-
mended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following:
1. Your local Microchip sales office
2. The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277
3. The Microchip Worldwide Site (www.microchip.com)
Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using.
New Customer Notification System
Register on our web site (www.microchip.com/cn) to receive the most current information on our products.
2002 Microchip Technology Inc.
DS21447C-page25
TC647
NOTES:
DS21447C-page 26
2002 Microchip Technology Inc.
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, KEELOQ,
MPLAB, PIC, PICmicro, PICSTART and PRO MATE are
registered trademarks of Microchip Technology Incorporated
in the U.S.A. and other countries.
FilterLab, microID, MXDEV, MXLAB, PICMASTER, SEEVAL
and The Embedded Control Solutions Company are
registered trademarks of Microchip Technology Incorporated
in the U.S.A.
dsPIC, dsPICDEM.net, ECONOMONITOR, FanSense,
FlexROM, fuzzyLAB, In-Circuit Serial Programming, ICSP,
ICEPIC, microPort, Migratable Memory, MPASM, MPLIB,
MPLINK, MPSIM, PICC, PICDEM, PICDEM.net, rfPIC, Select
Mode and Total Endurance are trademarks of Microchip
Technology Incorporated in the U.S.A. and other countries.
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.
© 2002, 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
and Mountain View, California in March 2002.
The Company’s quality system processes and
procedures are QS-9000 compliant for its
®
PICmicro 8-bit MCUs, KEELOQ® code hopping
devices, Serial EEPROMs, microperipherals,
non-volatile memory and analog products. In
addition, Microchip’s quality system for the
design and manufacture of development
systems is ISO 9001 certified.
2002 Microchip Technology Inc.
DS21447C - page 27
M
WORLDWIDE SALES AND SERVICE
Japan
AMERICAS
ASIA/PACIFIC
Microchip Technology Japan K.K.
Benex S-1 6F
Corporate Office
Australia
2355 West Chandler Blvd.
Microchip Technology Australia Pty Ltd
Suite 22, 41 Rawson Street
Epping 2121, NSW
3-18-20, Shinyokohama
Kohoku-Ku, Yokohama-shi
Kanagawa, 222-0033, Japan
Tel: 81-45-471- 6166 Fax: 81-45-471-6122
Chandler, AZ 85224-6199
Tel: 480-792-7200 Fax: 480-792-7277
Technical Support: 480-792-7627
Web Address: http://www.microchip.com
Australia
Tel: 61-2-9868-6733 Fax: 61-2-9868-6755
Korea
Rocky Mountain
China - Beijing
Microchip Technology Korea
168-1, Youngbo Bldg. 3 Floor
Samsung-Dong, Kangnam-Ku
Seoul, Korea 135-882
2355 West Chandler Blvd.
Chandler, AZ 85224-6199
Tel: 480-792-7966 Fax: 480-792-4338
Microchip Technology Consulting (Shanghai)
Co., Ltd., Beijing Liaison Office
Unit 915
Bei Hai Wan Tai Bldg.
Tel: 82-2-554-7200 Fax: 82-2-558-5934
Atlanta
No. 6 Chaoyangmen Beidajie
Beijing, 100027, No. China
Tel: 86-10-85282100 Fax: 86-10-85282104
500 Sugar Mill Road, Suite 200B
Atlanta, GA 30350
Singapore
Microchip Technology Singapore Pte Ltd.
200 Middle Road
Tel: 770-640-0034 Fax: 770-640-0307
China - Chengdu
#07-02 Prime Centre
Boston
Microchip Technology Consulting (Shanghai)
Co., Ltd., Chengdu Liaison Office
Rm. 2401, 24th Floor,
Singapore, 188980
2 Lan Drive, Suite 120
Westford, MA 01886
Tel: 978-692-3848 Fax: 978-692-3821
Tel: 65-6334-8870 Fax: 65-6334-8850
Taiwan
Ming Xing Financial Tower
Microchip Technology (Barbados) Inc.,
Taiwan Branch
Chicago
No. 88 TIDU Street
333 Pierce Road, Suite 180
Itasca, IL 60143
Chengdu 610016, China
11F-3, No. 207
Tel: 86-28-86766200 Fax: 86-28-86766599
Tung Hua North Road
Taipei, 105, Taiwan
Tel: 630-285-0071 Fax: 630-285-0075
China - Fuzhou
Dallas
Microchip Technology Consulting (Shanghai)
Co., Ltd., Fuzhou Liaison Office
Unit 28F, World Trade Plaza
Tel: 886-2-2717-7175 Fax: 886-2-2545-0139
4570 Westgrove Drive, Suite 160
Addison, TX 75001
Tel: 972-818-7423 Fax: 972-818-2924
No. 71 Wusi Road
EUROPE
Austria
Detroit
Fuzhou 350001, China
Tri-Atria Office Building
Tel: 86-591-7503506 Fax: 86-591-7503521
Microchip Technology Austria GmbH
Durisolstrasse 2
32255 Northwestern Highway, Suite 190
Farmington Hills, MI 48334
Tel: 248-538-2250 Fax: 248-538-2260
China - Shanghai
Microchip Technology Consulting (Shanghai)
Co., Ltd.
A-4600 Wels
Austria
Kokomo
Room 701, Bldg. B
Tel: 43-7242-2244-399
Fax: 43-7242-2244-393
Denmark
2767 S. Albright Road
Kokomo, Indiana 46902
Tel: 765-864-8360 Fax: 765-864-8387
Los Angeles
Far East International Plaza
No. 317 Xian Xia Road
Shanghai, 200051
Microchip Technology Nordic ApS
Regus Business Centre
Lautrup hoj 1-3
Tel: 86-21-6275-5700 Fax: 86-21-6275-5060
18201 Von Karman, Suite 1090
Irvine, CA 92612
China - Shenzhen
Microchip Technology Consulting (Shanghai)
Co., Ltd., Shenzhen Liaison Office
Rm. 1315, 13/F, Shenzhen Kerry Centre,
Renminnan Lu
Ballerup DK-2750 Denmark
Tel: 949-263-1888 Fax: 949-263-1338
Tel: 45 4420 9895 Fax: 45 4420 9910
New York
France
150 Motor Parkway, Suite 202
Hauppauge, NY 11788
Microchip Technology SARL
Parc d’Activite du Moulin de Massy
43 Rue du Saule Trapu
Shenzhen 518001, China
Tel: 631-273-5305 Fax: 631-273-5335
Tel: 86-755-2350361 Fax: 86-755-2366086
San Jose
China - Hong Kong SAR
Batiment A - ler Etage
Microchip Technology Inc.
2107 North First Street, Suite 590
San Jose, CA 95131
Microchip Technology Hongkong Ltd.
Unit 901-6, Tower 2, Metroplaza
223 Hing Fong Road
91300 Massy, France
Tel: 33-1-69-53-63-20 Fax: 33-1-69-30-90-79
Germany
Tel: 408-436-7950 Fax: 408-436-7955
Kwai Fong, N.T., Hong Kong
Microchip Technology GmbH
Steinheilstrasse 10
Tel: 852-2401-1200 Fax: 852-2401-3431
Toronto
6285 Northam Drive, Suite 108
Mississauga, Ontario L4V 1X5, Canada
Tel: 905-673-0699 Fax: 905-673-6509
India
D-85737 Ismaning, Germany
Tel: 49-89-627-144 0 Fax: 49-89-627-144-44
Microchip Technology Inc.
India Liaison Office
Italy
Divyasree Chambers
Microchip Technology SRL
Centro Direzionale Colleoni
Palazzo Taurus 1 V. Le Colleoni 1
20041 Agrate Brianza
1 Floor, Wing A (A3/A4)
No. 11, O’Shaugnessey Road
Bangalore, 560 025, India
Tel: 91-80-2290061 Fax: 91-80-2290062
Milan, Italy
Tel: 39-039-65791-1 Fax: 39-039-6899883
United Kingdom
Microchip Ltd.
505 Eskdale Road
Winnersh Triangle
Wokingham
Berkshire, England RG41 5TU
Tel: 44 118 921 5869 Fax: 44-118 921-5820
08/01/02
DS21447C-page 28
2002 Microchip Technology Inc.
相关型号：
TC647BEUA713
PWM Fan Speed Controllers With Minimum Fan Speed, Fan Restart and FanSense⑩ Technology for Fault Detection
MICROCHIP
TC647BEUATR
PWM Fan Speed Controllers With Minimum Fan Speed, Fan Restart and FanSense⑩ Technology for Fault Detection
MICROCHIP
©2020 ICPDF网 联系我们和版权申明