Hi,
I am working on a project using BG950A-GL CAT-M1/NBIoT module, which has firmware version BG950AGLAAR02A01.
Regarding to the PSM mode, the Hardware Design Doc (Version: 1.1 Date: 2023-07-12) suggests waking up the module without the PON_TRIG function should driver the PWRKEY low for 500-1000ms.
But in document BG77xA-GL&BG95xA-GL& BG950S-GL PSM Application Note (Version: 1.1 Date: 2024-08-29) instructs:
Step 1: Drive PWRKEY low and check if the module has been woken up from PSM. The UART port
stays inaccessible until the PON_TRIG is driven high.
Step 2: Establish the active UL and/or DL communication.
The module I am using has “R02” in its firmware version, so PON_TRIG is disabled. I managed to let it enter PSM mode with AT+QPSMS command and the modem responded with “+CSCON: 0PSM POWER DOWN”. But I found when I only toggle PWRKEY pin for 600ms does not wake up the main UART and there is no response to my subsequent AT commands.
What is right procedure to implement the PSM entering and waking up procedure?
Any help will be much appreciated.
Thanks!