Analogue Audio - Wavecom GR64 GSM/GPRS Integrator's Manual

5.9

Analogue Audio

The analogue audio signals comprise of two audio inputs to the Wireless CPU, and
two audio outputs from the Wireless CPU. The Auxiliary interface signals are single-
ended, whilst the MIC and EAR interface signals are differential. Analogue audio can
be used for various configurations, including handset, car kit, portable hands free and
speakerphone mode (with an additional output gain stage).
Five audio profiles are available for GR64 users to configure various modes of
operation. Each profile is factory set to represent different modes, typical of general
usage. The customer can modify profiles to optimize acoustic performance to their
specific application.
The analogue inputs and outputs share common uplink and downlink chains which
are multiplexed, and selectively switched by the user through AT-commands.
GR64 Integrators Manual
Page: 51/104
Pin Name Direction
53 MICIP Input
54 MICIN Input
55 EARP Output
56 EARN Output
57 AUXO Output
59 AUXI Input
60 AREF -
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Function
Microphone input positive
Microphone input negative
Earpiece output positive
Earpiece output negative
Auxiliary audio from Wireless CPU to host
Auxiliary audio to Wireless CPU from host
Analogue reference