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User’s Manual for Advantech SOM-A2558 series module V1.00
22
98 SMBUS_DAT
IO
System Management Bus data pin.
The pin is implemented by SoC
PXA255 I2C bus.
Pull high with
4.7Kohm
99 SYS_VCC3P3
P SOM system DC power 3.3V input
pin. SYS_VCC should always be
power
ed by DC 3.3V even in sleep
mode.
-
100
USB_CP IO
USB Client Positive pin No pulling
101
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.
Powered
102
USB_CN IO
USB Client Negative pin. No pulling
103
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.
-
104
BUZZER_OUT
O
Buzzer-out control signals. User
can use the pin to control buzzer
power pin.
No pulling
105
USB_LINK_5V
I USB
client link status indicator pin.
When the pin is high, it means
USB client port has been
plugged-in USB device.
Pull low with
100Kohm
106
UART2_RTS O
UART2 Request-to-Send signal
pin. If user doesn’t need UART2
function, user could use this pin as
GPIO. The pin connects to SoC
PXA255 GPIO45.
Pull high with
100Kohm
107
GND P Ground -
108
UART2_DCD
I UART2 data-Carrier-Detect signal
pin.
Pull high with
100Kohm
109
UART3_DCD
I UART3 data-Carrier-Detect signal
pin.
Pull high with
100Kohm
110
UART2_DSR
I UART2 Data-Set-Ready signal pin.
Pull high with
100Kohm
111
UART3_DSR
I UART3 Data-Set-Ready signal pin.
Pull high with
100Kohm
112
UART2_TXD O
UART2 Transmit signal pin. If user
doesn’t need UART2 function, user
could use this pin as GPIO. The
pin connects to SoC PXA255
GPIO43.
Pull high with
100Kohm
113
UART3_RXD
I UART3 Receive signal pin. If user
doesn’t need UART3 function, user
could use this pin as GPIO. The
pin connects to SoC PXA255
GPIO46.
Pull high with
100Kohm
114
UART2_RXD
I UART2 Receive signal pin. If user
Pull high with