Sony Ericsson TT4031 (SE-GM29) - Manual (Page 30)

Owner’s Manual Rev 1.0 Page 30 of 30
The power connector electrical characteristics are listed below:
Pin Signal Dir Limits Description
1 VCC I 5 - 32 V Positive power input
2 - - - No connection
3 HR_IN I –0.5 - 32 V Active high control line used to switch
off or reset the modem
V
IH
> 5 V, V
IL
< 2 V
Power off: 1 s < t < 2 s
Hard reset: t > 3.5 s
4 TO_IN I –0.5 - 32 V Active high control line used to switch
on the modem
V
IH
> 5 V, V
IL
< 2 V
Power on: t > 0.2 s
5 - - - No connection
6 GND I - Negative power (ground) input and
return path for TO_IN and HR_IN
2.2 Audio Connector
A 4-way RJ9 connector, as shown below, allows a telephone handset to be
plugged into the modem, giving access to the microphone and earpiece
signals. The connector may also be used to drive other analogue audio sub-
systems or devices.
Although the TT4031 (SE-GM29) is pre-configured to work with a range of
handsets, the audio interface is flexible and its performance can be
configured, using AT commands, to match a particular handset or audio
subsystem.