Motorola MTM800 FuG Installation Manual page 82

82 | Connectors and PIN Assignment
PIN Function
9 SPEAKER-
10 SPEAKER+
11 TX_AUDIO
12 GND_ANA
13 MIC1 / EXT_MIC
14 RX_AUDIO
15 MIC2
16 GND_MIC
17 EXTERNAL_PTT
18 UART2_DTR / USBy_ID
19 HOOK_PA_EN
20 UART2_TXD / USBy_TX
21 UART2_RTS / USBy_VBUS
22 UART2_RXD / USBy_RX
23 EMERGENCY
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Description
Loudspeaker (PA) output –
Loudspeaker (PA) output +
TX audio input (Line In, 26–Pins rear connector J400, used for audio
recording)
Main audio ground
External microphone input (EXT_MIC), or first microphone (MIC1),
Nominal sensitivity: 80mV rms, Bias voltage: 9.3V or 2.1V (Selected
accessory dependent)
RX audio output (Line Out, 26–Pins rear connector J400, used for au-
dio playback)
Microphone input (MIC2), Nominal sensitivity: 80mV rms, Bias volt-
age: 9.3V or 2.1V (selected accessory dependent)
Ground (for MIC)
PTT input (pulled via 4K7 to 5V)
RS232 or UART1 / UART2
DTR / 2nd USB2.0 (OTG)
ID
HOOK_PA_EN input (or
programmable 5V GPIO)
RS232 or UART2 TXD /
2nd USB2.0 (OTG) D+
RS232 or UART2 RTS /
2nd USB2.0 (OTG) VBUS
– 100mA
RS232 or UART2 RXD /
2nd USB2.0 (OTG) D-
Emergency Input (Pulled
via 24K9 to A+) – Pull low
to power on
Warning:
Do not ground! See Appendix
for Rated Audio Power.
Do not attach audio accesso-
ries single-ended between the
Speaker out (+ or -) and
ground on rear connector be-
cause the mobile radio has a
Class D amplifier. If it is re-
quired to connect a single
ended accessory to speaker
out then the balanced speaker
output from the radio must be
converted to single-ended us-
ing a transformer or an electri-
cal circuit.
• When Expansion Head is connected –
the connection is USB2.0.
• When Expansion Head is not connect-
ed and UART2 is configured on pins
1-4 in CPS codeplug the connection is
USB2.0.
• If UART2 is not configured on pins
1-4 in CPS codeplug USB2.0/UART2
is automatically switched depending
on which accessory is detected.
Table continued...