Technical data

4.9 Analogue Audio
Pin Name Direction Function
53 MICIP Input Microphone input positive
54 MICIN Input
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Microphone input negative
55 EARP Output Earpiece output positive
Low-level
56 EARN Output Earpiece output negative
Auxiliary audio from Wireless CPU® to
host
57 AUXO Output
59 AUXI Input
Auxiliary audio to Wireless CPU® from
host
High-level
60 AREF - Analogue reference
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: 53/106