SYSTEM CONNECTOR INTERFACE
22
LZT 123 8020 R1A
24 IO4
I/O
Digital 2.75V
General purpose input/output 4
25
VRTC
I
Supply 1.8V
Supply for real time clock
26
ADC1
I
Analogue
Analogue to digital converter 1
27
ADC2
I
Analogue
Analogue to digital converter 2
28
ADC3
I
Analogue
Analogue to digital converter 3
29
SDA
I/O
2.75V, internal
pull up
I
2
C data
30 SCL
O 2.75V,
internal
pull up
I
2
C clock
31
BUZZER
O
Digital 2.75V
Buzzer output from radio device
32 OUT3
DSR
O
O
Digital 2.75V
General purpose output 3
Data set ready (UART1)
33
LED
IO6
O
I/O
Digital 2.75V
Flashing LED
General purpose I/O 6
34 VIO
O Power
Out
2.75 V
Radio device power indication. VIO is a
2.75 V at 75 mA output supply that can be
used to power external circuitry that
interfaces to the radio device
35
TX_ON
O
Digital 2.75V
This output indicates when the GSM radio
device is going to transmit the burst
36 RI
O2
O
O
Digital 2.75V
Ring Indicator (UART1)
General purpose output 2
37
DTR
IN1
I
I
Digital 2.75V
Data Terminal Ready (UART1)
General purpose input 1
38 DCD
O1
O
O
Digital 2.75V
Data Carrier Detect (UART1)
General purpose output 1
39
RTS
IO9
I
I/O
Digital 2.75V
Request To Send (UART1)
General purpose I/O 9
40 CTS
O4
O
O
Digital 2.75V
Clear To Send (UART1)
General purpose output 4
41
TD
I
Digital 2.75V
Transmitted Data (UART1).
Data from DTE (host) to DCE (radio
device).
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