Sony Ericsson GTR-64 manual Expansion I/O port, Pin, Dir Max. Voltage Description Signal Limits

GTR64 http://www.matrix.es/GTR64

Data Carrier Detect (DCD)

DCD indicates that the DCE is receiving a valid carrier (data signal) when low. You can define the exact behaviour of DCD with an AT command.

Ring Indicator (RI)

RI indicates that a ringing signal is being received by the DCE when low. You can define the exact behaviour or RI with an AT command.

3.7 Expansion I/O port

The GTR64 supports a range of configurable I/Os including a second 2-wire RS232 interface. on the 15 pin high density connector together with I2C bus and VTRC with ALARM functionality.

1.	SCL	6.	SDA	11.	IO 2
2.	RD3	7.	VRTC	12.	IO 4
3.	TD3	8.	ALARM	13.	SERVICE
4.	IO 1	9.	VREF	14.	GND
5.	IO 3	10. RI / IO8		15.	ADC 1

Pin	GTR64		Dir		Max. Voltage	Description
	Signal				limits
1	SCL		O		-0.5 - +3.6 V	I2C clock signal
2	RD3		I		±5 v	Secondary RS232 UART	signal:
						Transmitted data
						Secondary RS232 UART	signal
3	TD3			± 25V		Received data.
						V IL < 0.6V, V IH > 2.4V
4	IO 1		I/O		-0.5 - VREF	Digital input/output I/O 1
						Digital VREF
5	IO 3		I/O		-0.5 - VREF	Digital input/output I/O 3
						Digital VREF
6	SDA		I/O		-0.5 - +3.6 V	I2C data
7	VRTC		I		1,1 – 1,55 V	VRTC supply for real time clock
8	ALARM		O		-0.5 - +3.6V	RTC Alarm
9	VREF	O		+3.6 V		LEAVE UNCONNECTED !!!
GTR64 Integrators Manual V.1.2						Pag. 19
Preliminary. Subject to change without prior notice