ADLINK Technology cExpress-KL User Manual page 25

3.3.12. Miscellaneous
Signal Pin
SPKR B32
WDT B27
THRM# B35
THERMTRIP# A35
FAN_PWMOUT B101
FAN_TACHIN11 B102
TPM_PP A96
3.3.13. SMBus
Signal Pin
SMB_CK B13
SMB_DAT# B14
SMB_ALERT# B15
3.3.14. I2C Bus
Signal Pin
I2C_CK B33
I2C_DAT B34
Pinouts and Signal Descriptions
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 PU/PD
O 3.3V
O 3.3V
I 3.3V
O 3.3VSB
O OD 3.3V PU 2.2K 3.3V
I OD 3.3V PU 10k 3.3V
I 3.3V PD 1k 3.3V
I/O PU/PD
I/O OD PU 8k2
3.3VSB 3.3VSB
I/O OD PU 8k2
3.3VSB 3.3VSB
I 3.3VSB PU 2k2
3.3VSB
I/O PU/PD
I/O OD PU 2k2
3.3VSB 3.3VSB
I/O OD PU 2k2
3.3VSB 3.3VSB
cExpress-KL
Comment
PD shall be on
the carrier board
PD is only
placed when
TPM is installed
on module
Comment
Comment
Sourced from
SEMA BMC by
default (sourced
from SoC or PCH
by BOM option)
Sourced from
SEMA BMC by
default (sourced
from SoC or PCH
by BOM option)
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