Motorola Cleartone CM5000 Basic Service Manual page 27

OVERVIEW
The usage is dependant on the setting in Native Programmer, which is described in Pro-
Analog Interface
For the external interface other than serial communication, J902 has analog interface as follows:
1. Ext. SP
2. Ext. Mic
3. Ext. PTT
4. Ext. Alm
5. TX Audio
6. EMG SW
7. RX Audio
8. SP enable
9. SW B+
10. Hook
11. Ignition
Panel Interface
Communication with the Key & Display unit such as Key operation signal, LCD control interface,
LCD/Key backlight control, and 2 color indicator LED control interface is performed via connector
J901 by serial communication. The signaling level is 0 V / 3.3 V and baud rate is 115.2 kbps. Other
than control signal, audio output signal for the handset, audio signal from microphone and Hook sig-
nal are connect with Key/Display unit via J901.
Audio Circuit
Audio circuit includes receive audio, transmit audio circuit.
Receive audio circuit has speaker amplifier and handset audio circuit.
Receive Speaker
Received signal that is converted to the analog signal at Linear CODEC in the AFE is volume con-
trolled by the linear CODEC and amplified by the OP amplifier (IC802)
Speaker amplifier (IC805) is BTL type amplifier. It amplifies audio signal. Speaker output signal is
connected to the external speaker via interface connector J902.
Operational tone signal is generated by the SOC and amplified by the OP amplifier (IC802). Then
the tone volume is adjusted by the potentiometer (IC803) and OP amplifier (IC802) and mixed with
receive signal by the OP amplifier (IC802).
Handset Circuit
Fixed level received audio signal is outputted by the AFE and amplified by the OP amplifier (IC801).
Variable volume control received audio signal is mixed at OP amplifier (IC801) via audio switch
(IC806). Operation tone is mixed in (IC801) via audio switch (IC804). SOC controls selection of
these signals.
CM5000 Mobile Repeater/Gateway - Basic Service Manual
gramming Manual (part number 6866539D46).
External speaker output
Microphone input terminal other than Key/Display unit
PTT input terminal other than Key/Display unit
Alarm output terminal for external alarm device
Transmit audio signal input other than Key/Display unit
EMG input terminal other than Key/Display unit
RX signal output terminal for external device
Speaker output control
Switched 13 V output
Hook signal input
Ignition sense input
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