TC654 Ver la hoja de datos (PDF) - Microchip Technology
Número de pieza
componentes Descripción
Fabricante
TC654 Datasheet PDF : 38 Pages
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TC654/TC655
3.0 PIN FUNCTIONS
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1: PIN FUNCTION TABLE
Name
VIN
CF
SCLK
SDA
GND
FAULT
SENSE2
SENSE1
VOUT
VDD
Function
Analog Input
Analog Output
Serial Clock Input
Serial Data In/Out (Open Drain)
Ground
Digital (Open Drain) Output
Analog Input
Analog Input
Digital Output
Power Supply Input
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.
DS20001734C-page 8
2002-2014 Microchip Technology Inc.
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