Modem User Manual

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LZT 123 1834 30

Table 5.1-1 Pin Assignments

Pin Name Direction Function

PIN

Connection

Required

1 VCC Input DC power Yes

2 GND - Ground Yes

3 VCC Input DC power Yes

4 GND - Ground Yes

5 VCC Input DC power Yes

6 GND - Ground Yes

7 VCC Input DC power Yes

8 GND - Ground Yes

9 VCC Input DC power Yes

10 GND - Ground Yes

11 CHG_IN Input Battery charger power

12 GND - Ground Yes

ADIN4 Input ADC Input 4

13

GPIO5 In/Out General purpose IO

14 ON/OFF Input Device on/off control Yes

15 SIMVCC Output 1.8V or 3.0V SIM card supply Yes

1

16 SIMDET Input SIM presence detection Yes

1

17 SIMRST Output SIM card reset signal Yes

1

18 SIMDAT In/Out SIM card data Yes

1

19 SIMCLK Output SIM card clock signal Yes

1

20 DAC Output Pulse width modulated signal

21 GPIO1 In/Out General purpose IO

22 GPIO2 In/Out General purpose IO

23 GPIO3 In/Out General purpose IO

24 GPIO4 In/Out General purpose IO

25 VRTC Input DC supply for real time clock

26 ADIN1 Input ADC Input 1

27 ADIN2 Input ADC Input 2

28 ADIN3 Input ADC Input 3

29 SDA In/Out I

2

C data

30 SCL Output I

2

C clock signal

31 BUZZER Output Buzzer Output

DSR1 Output Data Set Ready (UART1) Yes

2

32

GPIO7 In/Out General purpose IO

LED Output LED control signal

33

GPIO6 In/Out General purpose IO

34 VREF In (Out) Core voltage reference Yes