Advantech SOM-A2552 Usbcp, Buzzerout, USBLINK5V, UART2RTS, UART2DCD, UART3DCD, UART2DSR, UART3DSR

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

			mode.
100	USB_CP	IO	USB Client Positive pin	No pulling
101	SYS_VCC3P3	P	SOM system DC power 3.3V input	Powered
			pin. SYS_VCC should always be
			powered by DC 3.3V even in sleep
			mode.
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	No pulling
			can use the pin to control buzzer
			power pin.
105	USB_LINK_5V	I	USB client link status indicator pin.	Pull low with
			When the pin is high, it means	100Kohm
			USB client port has been
			plugged-in USB device.
106	UART2_RTS	O	UART2 Request-to-Send signal	Pull high with
			pin. If user doesn’t need UART2	100Kohm
			function, user could use this pin as
			GPIO. The pin connects to SoC
			PXA255 GPIO45.
107	GND	P	Ground	-
108	UART2_DCD	I	UART2 data-Carrier-Detect signal	Pull high with
			pin.	100Kohm
109	UART3_DCD	I	UART3 data-Carrier-Detect signal	Pull high with
			pin.	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	Pull high with
			doesn’t need UART2 function, user	100Kohm
			could use this pin as GPIO. The
			pin connects to SoC PXA255
			GPIO43.
113	UART3_RXD	I	UART3 Receive signal pin. If user	Pull high with
			doesn’t need UART3 function, user	100Kohm
			could use this pin as GPIO. The
			pin connects to SoC PXA255
			GPIO46.
114	UART2_RXD	I	UART2 Receive signal pin. If user	Pull high with
			doesn’t need UART2 function, user	100Kohm
			could use this pin as GPIO. The
			pin connects to SoC PXA255
			GPIO42.
115	UART3_RTS	O	UART3 Request-to-Send signal	Pull high with
			pin.	100Kohm

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