Miscellaneous; Miscellaneous Signal Description - Advantech SOM-ETX Series Design Manual

5.14 Miscellaneous

5.14.1 Miscellaneous Signal Description

Table 5.25 Misc signal descriptions
Pin Signal
D6 SPKER
D8 BATT
D16 I2CCLK
D22 I2CDAT
D23 SMBCLK
D24 SMBDAT
D4 PWGIN
D3 VCCSB5V
D5 PS-ON#
D7 PWRBTN#
D21 EXTSMI#
D90 RINGWAKE#
D13 ROMCS#
D15 EXT_ROMCS#
D20 GPCS
108
Advantech SOM-ETX Design Guide
I/O Description
This is the PC speaker output signal from SOM-ETX module.
I
Please connect this signal to the speaker.
3V backup cell input from carrier to SOM-ETX module for RTC
O operation and storage register non-volatility in the absence of
system power. (BATT=2.4V-3.3V)
Clock and data line of I2C-Bus. Switched I/O-lines with
I approximate 10kHz. Do not use as multi-master. Intended for
EEPROM support and other simple I/O-devices.
Clock and data line of SM-Bus. No standard signals, please
I contact your CPU board supplier for hard-and software
support.
High active input from carrier to SOM-ETX module for
O
indicating that power supply is ready.
Power supply input for internal Suspend circuit. Connect to 5V
P
Stand by power if available from ATX power supply.
Remove All Circuit Power Except Internal Suspend Circuit.
PS_ON will become active high to disable all the circuits
I
except internal Suspend circuit. Connect to PS-On of your ATX
power supply.
Power Button Input. Connect with switch or open collector
O
driver to GND for ATX power button function.
External system-management-interrupt input. Please connect
this signal to an external SMI event input on the SOM-ETX
I CPU module, then carrier board can doing a power
management function. WDGACT# WatchDog active signal.
This signal can reset the system
Wakeup signal from carrier board to SOM-ETX CPU module.
O Please connect this pin to a wakeup pin on the SOM-ETX CPU
module.
Boot device chip select from SOM-ETX CPU module to the
flash memory on the carrier board. For internal use only! Do
I
not connect!
Boot device chip select from carrier board to SOM-ETX CPU
O
module. For internal use only! Do not connect!
Pull high on carrier board to inform SOM module having
O external BIOS on the carrier board. For internal use only! Do
not connect!
Chapter 5 Carrier Board Design Guidelines