Integration Guide

Table Of Contents

BRING-UP AND TESTING

FUNCTIONAL VERIFICATION WITH ASSEMBLED MODULE

32 PROPRIETARY MODULE INTEGRATION GUIDE

SEQUANS Communications

5.4.1.2 Troubleshooting

• Excessive current draw

Check all VZM20Q voltage supplies. Confirm that there is no VZM20Q

supply short circuits. Voltage should read according to the nominal

requirement.

• No current draw or current less than expected

a) Check the external power supply wiring

b) Check for dry joint between VZM20Q pin(s) and the power supply

source.

5.4.2 Confirm Module Power-Up Operation (UART1)

An example of the output on UART1 console is provided below (boot in FFH

mode):

[0000000000] RBGerbil 11.5@26553 '5.0.0.0 [26553]'

[0000000004] Reset cause 'EXT'(real 'EXT' ) (bootWDG :

'0') [rawRst '0x00000001']

[0000000011] regConfig 0xEF317ABF@1

[0000000014] Running sector 0x1C040000

[0000000018] boot: Current flash, timeout 10000, proto thp

[0000000023] FFH forced.

[0000000025] boot: Switched to uart1, timeout 60000, proto

[0000000031] uart: using uart1 with baudrate 921600

[0000000035] [AT] Info: Forcing baudrate to 115200 for AT

negociation