Technical data

SYSTEM CONNECTOR INTERFACE
21
LZT 123 8020 R1A
Note! Under the heading “Dir” in the table, radio device input and
output signals are indicated by the letters I and O respectively.
Pin Signal Name Dir Signal Type Description
1 VCC - Supply Power supply
2 DGND - - Digital ground
3 VCC - Supply Power supply
4 DGND - - Digital ground
5 VCC - Supply Power supply
6 DGND - - Digital ground
7 VCC - Supply Power supply
8 DGND - - Digital ground
9 VCC - Supply Power supply
10 DGND - - Digital ground
11 CHG_IN (RFU) - Battery charge
power
Battery charging
12 DGND - - Digital ground
13 IO5
ADC4
I/0
I
Digital 2.75V
Analogue
General purpose input/output 5
Analogue to digital converter 4
14 ON/OFF I Internal pull
up, open drain
Turns the radio device on and off.
15 SIMVCC - Digital 3 V/5 V SIM card power supply. Power output from
radio device for SIM Card
16 SIMPRESENCE I Internal pull
up, open drain
SIM Presence
A “1” indicates that the SIM is missing; a
“0” that it is inserted
17 SIMRST O Digital 3 V/5 V SIM card reset
18 SIMDATA I/O Digital 3 V/5 V SIM card data
19 SIMCLK O Digital 3 V/5 V SIM card clock
20 DAC O Analogue Digital to analogue converter
21 IO1 I/O Digital 2.75V General purpose input/output 1
22 IO2
ADC5
I/O
I
Digital 2.75V
Analogue
General purpose input/output 2
Analogue to digital converter 5
23 IO3 I/O Digital 2.75V General purpose input/output 3