4.3 Connecting to a COM Express™ CPU Module
The conga-SBM²C signals listed in the following table must be connected to a COM
Express™ CPU module via the carrier board.
conga-SBM²C
Signal
COM Express™
Signal
+12V
VCC_12V
5VSB
VCC_5V_SBY
GND
GND
C_SCL
I2C_CK
C_SDA
I2C_DAT
C_BATLOW#
BATLOW#
C_PBTN#
PWRBTN#
C_PSON#
SUS_S3#
C_SLP_S5#
SUS_S5#
The following table lists additional conga-SBM²C signals that are mandatory and must
be implemented on the COM Express™ carrier board in order to ensure basic
functionality.
SBM²C Signal
Description
I_OnBut#
Must be connected to a signal used to turn on the system such as a button on a front panel
BAT1
Battery 1 power connection
B1_SDA, B1_SCL
I²C-bus used for communication with battery 1
Uin
Connection to 19V/4.5A power source
The following table lists additional conga-SBM²C signals that are optional and can be
implemented on the COM Express™ carrier board. Utilizing these signals will provide
additional functionality.
SBM²C Signal
Description
BPR
Buzzer output
µC_VCC
Supply for external I/O
TDI, TDO, TCK, TMS
JTAG interface
M_SDA, M_SCL
SBM²C internal I²C-bus
BAT2
Battery 2 power connection
B2_SDA, B2_SCL
I²C-bus used for communication with battery 2
5V_VCC
5V system power
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