nanoX-BT
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3.3.13.
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
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
A96
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
No TPM
supported
3.3.14.
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
3.3.15.
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 Source SEMA BMC or BayTrail SOC as
alternative
I2C_DAT B34
General purpose I²C port data I/O line
I/O OD 3.3VSB PU 2k2 3.3VSB Source SEMA BMC or BayTrail SOC as
alternative
3.3.16.
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
GPO[3] B63
General purpose output pins.
O 3.3V
PU 10K 3.3V
After hardware RESET output low
GPI[0] A54
General purpose input pins. Pulled high internally on the
module.
I 3.3V
PU 10K 3.3V
PU not in PICMG suggest 10K
GPI[1] A63
General purpose input pins. Pulled high internally on the
module.
I 3.3V
PU 10K 3.3V
PU not in PICMG suggest 10K
GPI[2] A67
General purpose input pins. Pulled high internally on the
module.
I 3.3V
PU 10K 3.3V
PU not in PICMG suggest 10K
GPI[3] A85
General purpose input pins. Pulled high internally on the
module.
I 3.3V
PU 10K 3.3V
PU not in PICMG suggest 10K
