Advantech RISC Module SOM-A2552 - Manual (Page 21)

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User’s Manual for Advantech SOM-A2552 series module V1.00
21
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
doesn’t need UART2 function, user
could use this pin as GPIO. The
pin connects to SoC PXA255
GPIO42.
Pull high with
100Kohm
115 UART3_RTS O UART3 Request-to-Send signal
pin.
Pull high with
100Kohm