+-----------------------------------------+
| 16 15 14 13 12 11 10 9 |
| ANT o o o o o o o o Charge |
| (O) [ ] (o) |
| o o o o o o o o |
| 8 7 6 5 4 3 2 1 |
+-----------------------------------------+
Pin
Signal
Description
1
GND
Digital ground
2
MIC/JCONN
External audio input from accessories or handsfree microphone.
Multiplexed with junction box connection control signal
3
AGND
Analogue ground for accessories
4
TDA
Transmitted DBUS data to the accessories
5
M2BUS
Serial Bidirectional data and control between the handportable
and accessories
6
HOOK/RXD2
Hook indication. HP has a 100KE pull-up resistor
7
PHFS/TXD2
Handsfree device power on/off, data to flash programming
device
8
VCHAR
Battery charging voltage
9
GND
Digital ground
10
EAR/HFPWR
External Audio output to accessories or handsfree speaker
