Miscellaneous; Smbus; I2C Bus - ADLINK Technology Express-SL User Manual

3.3.13

Miscellaneous

Signal Pin #
SPKR B32
WDT B27
THRM# B35
THRMTRIP# A35
FAN_PWMOUT B101
FAN_TACHIN B102
TPM_PP A96
3.3.14

SMBus

Signal Pin #
SMB_CK B13
SMB_DAT# B14
SMB_ALERT# B15
3.3.15

I2C Bus

Signal Pin #
I2C_CK B33
I2C_DAT B34
Description
Output for audio enunciator, the "speaker" in PC-AT
systems
Output indicating that a watchdog time-out event has
occurred.
Input from off-module temp sensor indicating an over-temp
situation.
Active low output indicating that the CPU has entered
thermal shutdown.
Fan speed control. Uses the Pulse Width Modulation
(PWM) technique to control the fan's RPM.
Fan tachometer input for a fan with a two pulse output.
Trusted Platform Module (TPM) Physical Presence pin.
Active high. TPM chip has an internal pull down. This
signal is used to indicate Physical Presence to the TPM.
Description
System Management Bus bidirectional clock line. Power
sourced through 5V standby rail and main power rails.
System Management Bus bidirectional data line. Power
sourced through 5V standby rail and main power rails.
System Management Bus Alert – active low input can
be used to generate an SMI# (System Management
Interrupt) or to wake the system. Power sourced
through 5V standby rail and main power rails.
Description
General purpose I²C port clock output/input
General purpose I²C port data I/O line
I/O
O 3.3V
O 3.3V
I 3.3VSB
O 3.3V
O OD 3.3V
I OD 3.3V
I 3.3V
I/O
I/O OD 3.3VSB
I/O OD 3.3VSB
I 3.3VSB
I/O
I/O OD 3.3VSB
I/O OD 3.3VSB
25
Express-SL/SLE
PU/PD Comment
PU 2.2K 3.3V
PU 10k 3.3V
PD 1k PD only when TPM on
module
PU/PD Comment
PU 2.2K 3.3VSB
PU 2.2K 3.3VSB
PU 2k2 3.3VSB
PU/PD Comment
PU 2k2 3.3VSB Source SEMA BMC
PU 2k2 3.3VSB Source SEMA BMC