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TC655EUN Arkusz danych(PDF) 8 Page - Microchip Technology

Numer części TC655EUN
Szczegółowy opis  Dual SMBus??PWM Fan Speed Controllers With Fan Fault Detection
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TC654/TC655
DS20001734C-page 8
 2002-2014 Microchip Technology Inc.
3.0
PIN FUNCTIONS
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1:
PIN FUNCTION TABLE
3.1
Analog Input (VIN)
A voltage range of 1.62V to 2.6V (typical) on this pin
drives an active duty-cycle of 30% to 100% on the
VOUT pin.
3.2
Analog Output (CF)
Positive terminal for the PWM ramp generator timing
capacitor. The recommended CF is 1 µF for 30 Hz
PWM operation.
3.3
SMBus Serial Clock Input (SCLK)
Clocks data into and out of the TC654/TC655. See
Section 5.0 “Serial Communication” for more infor-
mation on the serial interface.
3.4
Serial Data (Bi-directional) (SDA)
Serial data is transferred on the SMBus in both direc-
tions using this pin. See Section 5.0 “Serial Commu-
nication” for more information on the serial interface.
3.5
Digital (Open Drain) Output
(FAULT)
When the fan’s RPM falls below the user-set RPM
threshold (or OTF occurs with TC655), a logic low sig-
nal is asserted.
3.6
Analog Input (SENSE2)
Fan current pulses are detected at this pin. These
pulses are counted and used in the calculation of the
Fan 2 RPM.
3.7
Analog Input (SENSE1)
Fan current pulses are detected at this pin. These
pulses are counted and used in the calculation of the
Fan 1 RPM.
3.8
Digital Output (VOUT)
This active high complimentary output drives the base
of an external transistor or the gate of a MOSFET.
3.9
Power Supply Input (VDD)
The VDD pin with respect to GND provides power to the
device. This bias supply voltage may be independent of
the fan power supply.
Name
Function
VIN
Analog Input
CF
Analog Output
SCLK
Serial Clock Input
SDA
Serial Data In/Out (Open Drain)
GND
Ground
FAULT
Digital (Open Drain) Output
SENSE2
Analog Input
SENSE1
Analog Input
VOUT
Digital Output
VDD
Power Supply Input


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