ADLINK cExpress-BL - Manual (Page 22)

Page 22 cExpress-BL
3.3.12 Miscellaneous
Signal Pin # Description I/O PU/PD Comment
SPKR B32 Output for audio enunciator, the “speaker” in PC-AT
systems O 3.3V
WDT B27 Output indicating that a watchdog time-out event has
occurred. O 3.3V
THRM# B35 Input from off-module temp sensor indicating an over-
temp situation. I 3.3V
THERMTRIP# A35 Active low output indicating that the CPU has entered
thermal shutdown. O 3.3V PU 330 ohm 3.3V
FAN_PWMOUT B101 Fan speed control. Uses the Pulse Width Modulation
(PWM) technique to control the fan’s RPM.
O OD 3.3V
FAN_TACHIN11 B102 Fan tachometer input for a fan with a two pulse output. I OD 3.3V PU 10k 3.3V
TPM_PP11 C83 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. I 3.3V PD 10k 3.3V
PD is only placed
when TPM is
installed on module
3.3.13 SMBus
Signal Pin # Description I/O PU/PD Comment
SMB_CK B13 System Management Bus bidirectional clock line.
Power sourced through 5V standby rail and main power
rails. I/O OD 3.3VSB PU 2k2 3.3VSB
SMB_DAT# B14 System Management Bus bidirectional data line. Power
sourced through 5V standby rail and main power rails. I/O OD 3.3VSB PU 2k2 3.3VSB
SMB_ALERT# B15 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. I 3.3VSB PU 10k 3.3VSB
3.3.14 I2C Bus
Signal Pin # Description I/O PU/PD Comment
I2C_CK B33 General purpose I²C port clock output/input I/O OD 3.3VSB PU 2k2 3.3VSB
I2C_DAT B34 General purpose I²C port data I/O line I/O OD 3.3VSB PU 2k2 3.3VSB
3.3.15 General Purpose I/O (GPIO)
Signal Pin # Description I/O PU/PD Comment
GPO[0] A93 General purpose output pins. O 3.3V PU 10K 3.3V After hardware
RESET output low
GPO[1] B54 General purpose output pins. O 3.3V PU 10K 3.3V After hardware
RESET output low
GPO[2] B57 General purpose output pins. O 3.3V PU 10K 3.3V After hardware
RESET output low