SYSTEM CONNECTOR INTERFACE
23
LZT 123 8020 R1A
42
RD
O
Digital 2.75V
Received Data (UART1).
Data from DCE (radio device) to DTE
(host).
43
TD3
I/O7
I
I/O
Digital 2.75V
Transmitted data (UART3)
General purpose I/O 7
44 RD3
I/O8
O
I/O
Digital 2.75V
Received data (UART3)
General purpose I/O 8
45
TD2
I
Digital 2.75V
Transmitted data (UART2).
Used for flashing the memory.
46 RD2
O Digital
2.75V Received
data
(UART2).
Used for flashing the memory.
47
PCMULD
I
Digital 2.75V
DSP PCM digital audio input
48
PCMDLD
O
Digital 2.75V
DSP PCM digital audio output
49
PCMO
O
Digital 2.75V
Codec PCM digital audio output
50
PCMI
I
Digital 2.75V
Codec PCM digital audio input
51
PCMSYNC
O
Digital 2.75V
DSP PCM frame sync
52
PCMCLK
O
Digital 2.75V
DSP PCM clock output
53
MICP
I
Analogue
Microphone Input positive
54
MICN
I
Analogue
Microphone Input negative
55
BEARP
O
Analogue
Speaker output positive
56
BEARN
O
Analogue
Speaker output negative
57
AFMS
O
Analogue
Audio output from radio device
58
SERVICE
I
2.7V
Flash programming voltage for the MS.
Enable logger information if not flashing.
59
ATMS
I
Analogue
Audio input to radio device
60 AGND
- Analogue
Analogue
ground
5.2 General Electrical and Logical Characteristics
Many of the signals, as indicated in the table above, are high-
speed CMOS logic inputs or outputs powered from a 2.75V±5%
internal voltage regulator, and are defined as Digital 2.75V.
Whenever a signal is defined as Digital 2.75V, the following
electrical characteristics apply.
Parameter Min.
Max.
Units
High Level Output Voltage (V
OH
), I
o
= –2mA
2.2
2.75
V
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