Gcai Side Audio Uc - Modes Of Operation - Motorola MTP850 S Service Manual

B - 6

GCAI Side Audio UC - Modes of Operation

Note: HIGH = Logic 1 = 2.775V +/- 10%,
Pin
Pin
No.
1 GPIO-0
2 ADS / GMOI_DET HIGH (OPEN) HIGH (OPEN
3 OPT_5V / U+
4 GPIO_1
5 GPIO_2
6 GND
7 SPKR+
8 SPKR-
9 GPIO_3
10 MIC+
11 MIC-
12 GPIO_4
MTP850 TETRA Handportable Terminal / Basic Service Manual
LOW = Logic 0 = < 0.4V
Default State
Empty States (Spkr & Mic)
"RSM"
HIGH LOW (Detach
(Interrupt) Poll)
after read
attempt)
OFF (0V) 5.0V
HIGH HIGH (No
Function)
HIGH HIGH (No
Function)
GND (0V) GND (0V)
OFF ON (Default
Profile)
OFF ON (Default
Profile)
HIGH HIGH (PTT)
OFF ON (Default
Profile)
GND (0V) GND (0V)
HIGH HIGH (No
Function)
IMPRES
Default State
State
(Spkr only)
"RSM /
"Earpiece"
Earpiece"
LOW (Detach LOW (Detach
Poll) Poll)
HIGH (OPEN HIGH (OPEN
after read after read
attempt) valid ADS)
5.0V 5.0V
HIGH (No HIGH
Function) (Configurable)
HIGH (No HIGH
Function) (Configurable)
GND (0V) GND (0V)
ON (Default ON (IMPRES
Profile) Profile)
ON (Default ON (IMPRES
Profile) Profile)
HIGH (PTT) HIGH (PTT)
OFF ON (IMPRES
Profile)
GND (0V) GND (0V)
LOW HIGH (EMRG) HIGH (Not
(Grounded on
Accy side)
CONNECTOR PIN FUNCTIONS
GMOI State GMOI State
(Spkr & Mic) (Spkr only)
"RSM" "Earpiece"
LOW (Detach LOW (Detach
Poll) Poll)
HIGH (OPEN HIGH (OPEN
after read after read
49.9K) 20K)
3.65V 3.65V
HIGH (Not HIGH (Not
Connected) Connected)
HIGH HIGH
(Configurable) (Configurable)
GND (0V) GND (0V)
ON (GMOI ON (GMOI
Profile) Profile)
ON (GMOI ON (GMOI
Profile) Profile)
HIGH (PTT) HIGH (PTT)
ON (GMOI ON (GMOI
Profile) Profile)
GND (0V) GND (0V)
HIGH (Not
Connected) Connected)