4.18 Intel® Quiet System Technology Signals
Name
Type
Description
PWM[3:0]
(Desktop Only)
/ TP[12:9]
(Mobile Only)
OD O
Fan Pulse Width Modulation Outputs:
Pulse Width
Modulated duty cycle output signal that is used for Intel®
Quiet System Technology.
When controlling a 3-wire fan, this signal controls a power
transistor that, in turn, controls power to the fan. When
controlling a 4-wire fan, this signal is connected to the “
Control” signal on the fan. The polarity of this signal is
programmable. The output default is low. These signals are 5V
tolerant.
TACH0
(Desktop Only)
/ GPIO17
TACH1
(Desktop Only)
/ GPIO1
TACH2
(Desktop Only)
/ GPIO6
TACH3(Deskto
p Only) /
GPIO7
I
Fan Tachometer Inputs:
Tachometer pulse input signal that
is used to measure fan speed. This signal is connected to the “
Sense” signal on the fan.
Can instead be used as a GPIO.
SST
I/O
Simple Serial Transport:
Single-wire, serial bus. Connect to
SST compliant devices such as SST thermal sensors or voltage
sensors.
PECI
I/O
Platform Environment Control Interface:
Single-wire, serial
bus. Connect to corresponding pin of the processor for
accessing processor digital thermometer.