I2C And Watchdog; Table 25 X19 Pinout Description - Congatec conga-PA5 Pico-ITX SBC User Manual

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
1 BATLOW#
2 +3.3V
3 LED_WLAN# (mPCIe) WLAN LED for mPCIe
4 I2C_CLK
5 I2C_DAT
6 GND
7 WDTRIG#
8 WDOUT
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.
Copyright © 2017 congatec GmbH
Description Comments
Battery Low Active-low signal indicates low external battery. Input
with PU to +3.3V, connect to OC output.
+3.3VDC Power Supply
Connect cathode of LED. LED is on when WLAN is on.
I2C Clock line External PU/PD not required. +3.3V standby powered.
I2C Data line External PU/PD not required. +3.3V standby powered.
Ground
Active-low signal resets External PU/PD not required. +3.3V runtime powered.
system watchdog timer and Input signal for module. Should be driven by open
prevents watchdog event. collector output.
High active signal means +3.3V output with PD.
watchdog event is triggered.
Option
SMB_ALERT#
SMB_CLK
SMB_DAT
SLP_S3#
SLP_S4#
PA50m112
Description
SMBus Alert input
SMBus Clock line
SMBus Data line
Power state pin
Power state pin
X19
Pin 1
40/48