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2017
congatec
GmbH
PA50m112
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6.1.2
I2C and Watchdog
The conga-PA5 provides I2C and watchdog signals via the feature connector X19. Optionally, this connector can provide pins for SMBus and
power states.
Table 25 X19 Pinout Description
Pin
Default Signal
Description
Comments
Option
Description
1
BATLOW#
Battery Low
Active-low signal indicates low external battery. Input
with PU to +3.3V, connect to OC output.
2
+3.3V
+3.3VDC Power Supply
3
LED_WLAN# (mPCIe) WLAN LED for mPCIe
Connect cathode of LED. LED is on when WLAN is on. SMB_ALERT#
SMBus Alert input
4
I2C_CLK
I2C Clock line
External PU/PD not required. +3.3V standby powered. SMB_CLK
SMBus Clock line
5
I2C_DAT
I2C Data line
External PU/PD not required. +3.3V standby powered. SMB_DAT
SMBus Data line
6
GND
Ground
7
WDTRIG#
Active-low signal resets
system watchdog timer and
prevents watchdog event.
External PU/PD not required. +3.3V runtime powered.
Input signal for module. Should be driven by open
collector output.
SLP_S3#
Power state pin
8
WDOUT
High active signal means
watchdog event is triggered.
+3.3V output with PD.
SLP_S4#
Power state pin
Connector Type
X19: 8x1 pins, 1.25 mm pitch (Molex 53398-0871); Possible Mating Connector: Molex 51021-0800
Note
The signals are 3.3V compatible. A fuse limits the 3.3V power budget of connector X19 (pin 2) and X20 (pin 10) to a total of 500 mA hold
current. LED_WLAN# shall be connected to the LED's cathode. A series resistor is present on conga-PA5.
Pin 1
X19
