4.4.4Miscellaneous signals

These pins implement the ETX-945’s I2C and SM Bus interfaces, PC-speaker output, and RTC/CMOS backup power input.

Signal Name

Signal Function

Direction

SPEAKER

This logic-level signal can drive a piezoelectric speaker

O

 

(typically via a transistor)

 

BATT

2.4V to 3.3V DC backup power input for RTC and CMOS

I

 

RAM; typically connects to an external 3V lithium cell

 

I2CLK

Bidirectional I2C Bus clock signal

I/O

I2DAT

Bidirectional I2C Bus data signal

I/O

SMBCLK

Bidirectional SM Bus clock signal

I/O

SMBDATA

Bidirectional SM Bus data signal

I/O

KBINH#

Keyboard inhibit signal

In

OVCR#

USB over-current detected

In

ROMKBCS#

Reserved; do not connect

n/a

EXT_PRG

Reserved; do not connect

n/a

GPCS#

Reserved; do not connect

n/a

4.5SATA Connectors

The ETX-945 provides two SATA (Serial ATA) drive interfaces on a pair of 7-pin connectors located on the top side of the board. The position and pinout of each of these connectors is compliant with the ETX 3.0 Specification. The signal assignment appears below.

1

2

3

4

5

6

7

GND

TX+

TX-

GND

RX+

RX-

GND

ETX-945 User Manual 1.00

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Page 30

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Epson ETX-945 user manual Sata Connectors, Miscellaneous signals

ETX-945 specifications

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