Technical data

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).