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User’s Manual for Advantech SOM-A2552 series module V1.00

 

 

 

pole input pin.

 

90

nRESET

I

System hardware reset input pin.

Pull high with

 

 

 

Falling edge triggered. Hard reset.

10Kohm

 

 

 

(input) Level sensitive input used

 

 

 

 

to start the processor from a known

 

 

 

 

address. Assertion causes the

 

 

 

 

current instruction to terminate

 

 

 

 

abnormally and causes a reset.

 

 

 

 

When nRESET is driven high, the

 

 

 

 

processor starts execution from

 

 

 

 

address 0. nRESET must remain

 

 

 

 

low until the power supply is stable

 

 

 

 

and the internal 3.6864 MHz

 

 

 

 

oscillator has stabilized.

 

91

nDC_IN

I

System DC input indicator pin.

Pull low with

 

 

 

When the pin is low, it means

1Kohm

 

 

 

system is powered by external DC

 

 

 

 

power source. If user target device

 

 

 

 

is not power by battery, use could

 

 

 

 

use this pin as GPIO. The pin

 

 

 

 

connects to SoC PXA255 GPIO16.

 

92

SYS_VCC

P

SOM system DC power 5V input

-

 

 

 

pin. SYS_VCC should always be

 

 

 

 

powered by DC 5V even in sleep

 

 

 

 

mode.

 

 

93

SYS_VCC3P3

P

SOM system DC power 3.3V input

-

 

 

 

pin. SYS_VCC should always be

 

 

 

 

powered by DC 3.3V even in sleep

 

 

 

 

mode.

 

 

94

SYS_VCC

P

SOM system DC power 5V input

-

 

 

 

pin. SYS_VCC should always be

 

 

 

 

powered by DC 5V even in sleep

 

 

 

 

mode.

 

 

95

SYS_VCC3P3

P

SOM system DC power 3.3V input

-

 

 

 

pin. SYS_VCC should always be

 

 

 

 

powered by DC 3.3V even in sleep

 

 

 

 

mode.

 

 

96

SMBUS_CLK

IO

System

Management Bus clock

Pull high with

 

 

 

pin. The

pin is implemented by

4.7Kohm

 

 

 

SoC PXA255 I2C bus.

 

97

SYS_VCC3P3

P

SOM system DC power 3.3V input

-

 

 

 

pin. SYS_VCC should always be

 

 

 

 

powered by DC 3.3V even in sleep

 

 

 

 

mode.

 

 

98

SMBUS_DAT

IO

System Management Bus data pin.

Pull high with

 

 

 

The pin is implemented by SoC

4.7Kohm

 

 

 

PXA255 I2C bus.

 

99

SYS_VCC3P3

P

SOM system DC power 3.3V input

-

 

 

 

pin. SYS_VCC should always be

 

 

 

 

powered by DC 3.3V even in sleep

 

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Advantech SOM-A2552 manual Ndcin, Sysvcc, SYSVCC3P3, Smbusdat