Benefon Twin TGP71EU Service Manual page 22

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5.0.3.2 Pin descriptions
PIN 1:
PIN 2:
PIN 3:
9gp_71gb.fm
RS1RX RS1 Receive Data
VBAT Battery Voltage
RS1TX RS1 Transmit Data
EERPP Headset
EERPN Headset
AUXDET Headset Hook /
Accessory Detector
RS2RX/ RS2 Receive Data /
NMEAIN NMEA input (GPS)
RS2TX/ RS2 Transmit Data /
NMEAOUT NMEA output (GPS)
DGND Digital Ground
NC Not connected
DGND Digital Ground
NC
Not connected
CHARGE Charging Current +
Power On
Analog Ground should be connected to digital ground at only one point
inside the mobile phone. This point is the analog ground pin of the first
microphone amplifier stage.
CTS signal for asynchronic serial line number 1 (RS232). Used for data
communication between the GSM mobile phones and PC. With NMT
phones this pin is used to detect I2C interrupt. The pin is normally in
logical '1' state and I2C interrupt pulls the pin to logical '0'.
External MIC line is used as an audio input for the mobile phone. There
is a DC level in this pin for headset. The DC level has been made by
connecting the pin to 2.2V voltage via 2.2 kohm resistor.
Product: TGP71EU & TGP73EU /
08.02.2002
0V
2.7V
2.7V -6.0V
0V
2.7V
0 VDC / 1.4 VDC
+ 0 -1 VRMS AC
0 VDC / 1.4 VDC
+ 0 -1 VRMS AC
0V
2.7V
0V
2.7V
0V
2.7V
0V
0V
in
out
out
out
out
in/
in/out
out
in
in
in
2