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INTERFACES AND TEST POINTS
Issue A
Section 2
MCUK990801G8
Revision 0
– 10 –
Technical Guide
GD90 has two external connectors:
1.
a multi-way connector for use with a handsfree data;
2.
additional contacts for charging the battery pack while in the desktop charger;
All interfaces are electrically and mechanically compatible with GD90.
Main Unit <==> External I/O
30
D(5)
<==>
MPU Data bus (5)
31
D(6)
<==>
MPU Data bus (6)
32
D(7)
<==>
MPU Data bus (7)
33
REC_P
==>
Receiver Positive Output
34
REC_N
==>
Receiver Negative Output
No.
Name
H/H <=> EXT
Total
Function
H/H Circuit
1
GND
==>
6
Ground
2
PA_ON
==>
1
Gating of spectrum analyser for Transmitter
performance testing
L: Off, Hi - Z: On)
3
nLOGIC_PWR
==>
1
Accessory Power Control signal.
In the handsfree this is logical OR’ed with
IGNITION in order that the software can
maintain the Handsfree power-on state if the
user is in a call and that the IGNITION is
switched off. L: Power-on, Hi-Z: Power-off
4
IGNITION
<==
1
IGNITION is used in two cases.
1) Determine the mode of operation of the H/H
when the Handsfree accessory is attached.
L: At a suitable time enter dummy sleep mode
and therefore minimise the drain on the car
battery (nLOGIC_POWER = Hi - Z)
H: Normal mode
2) Satisfy 2nd of 2 conditions for sending
initialise Testset command and entering Testset
mode. (see nADP_SENSE for 1st condition)
L: Condition 2 satisfied
H: Enter Testset mode not satisfied
5
VBAT
<=>
1
The pin is either an input or an output
depending upon the battery connection.
1) Battery/Dummy battery connected: Output
supply terminal for attached accessories.
2) No connection: Low current input supply
terminal for non-RF performance checking in
Testset Mode or Flash programming.
6
nH/F_SENSE
<==
1
Handsfree sense line
L: connected
H (internal pull-up): disconnected
7
nRADIO_MUTE
==>
1
Radio Mute
L: mute, Hi-Z: unmute)
8
RX_AUDIO
==>
1
Accessory Receiving Audio
-16 dBm0 = 76.7m Vrms
9
GND
==>
Ground
Refer to pin 1
No.
Signal Name
MAIN <=> KEYPAD
Function
Connection
10095-1
10k
330p
10096-1
330
10097-1
330
50k
200k
10098-1
10099-1
330
100k
10100-1
330
50k
200k
10101-1
560
1 F
10102-1