User Guide

Sixfab Raspberry Pi 3G-4G/LTE Base HAT

Pin Descriptions

Pin Number Pin Name Description

2 5V PWR This pin is connected to the 5V power net

4 5V PWR This pin is connected to the 5V power net

8 PCI RX This pin functions as the serial data input to the module for UART

communication

10 PCI TX This pin functions as the serial data output from the module for

UART communication

13 USER LED It is a programmable user-led can control from Raspberry Pi

15 USER

BUTTON

This push button connected to Raspberry Pi and pulled up HIGH

state by default.

31 RI

This pin is Ring indicator functions as the indication for receiving call

or SMS, can be calibrated to HIGH or LOW using the AT commands

33 DTR When the module is in sleep mode, DTR pin allows to wake up the

module up by pulling it to LOW

W_DISABLE

This pin is used to turn Airplane Mode on the module, by pulling it

HIGH

HAT_PWR_OFF

The pin is used to shutdown the power regulator of the board and cut

the power of module by driving it HIGH state, can be used power

sensitive applications

6,9,14,25,30,34,39 GND This pins are connected to ground

Schematic

You can download the schematic of Base HAT from this Github repository.

LEDs

• PWR LED: When the module is powered up, this RED led turns on.

• SGNL LED:

This BLUE led indicates the status of the connection. When the connection is established and

data is being transmitted/received, this led will blink at special intervals. Otherwise, if there is no connection,

the led will remain oﬀ.

• USER LED:

It is a programmable user-led can control from the GPIO27 of Raspberry Pi for debugging or

just fun.