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Table 26 Miscellaneous Signal Descriptions
Signal
Pin #
Description
I/O
PU/PD Comment
FAN_PWMOUT
C67
Fan speed control. Uses the Pulse Width Modulation (PWM) technique to control the
fan’s RPM.
O OD
3.3V
FAN_TACHOIN
C77
Fan tachometer input.
I OD
Requires a fan with a two pulse output.
PP_TPM
C83
Physical Presence pin of Trusted Platform Module (TPM). Active high. TPM chip has
an internal pull-down. This signal is used to indicate Physical Presence to the TPM.
I 3.3V
Trusted Platform Module chip is optional.