Problem Statement :- we are facing issue in achieving power consumption when we change default baud rate other then 115200 (in our case it is 19200) , same AT command sequence we follow with default 115200 baud rate we are getting current of module in deep sleep < 1uA .
But when we change it to custom baud rate and no other changes are there in firmware and then module start to consume random current after getting "Enter Deep Sleep " Urc ,
Hardware wise
Vdd_ext = 0 V when in deep sleep
Rxd_modem Pullup by Txd Micro controller 3.6 V
Txd = 3.6 V
All hardware are as per hardware user Guide
Another Point : - If device is woken up from sleep once and then enter deep sleep
Example Flow → : EXIT sleep state (+EXIT SLEEP)→ Exit PSM state
(+ Exit PSM)→Re-establish the RRC connection(+CSCON:1)→ Data interaction →(inactive) timer)→ Idle →PSM (+ENTER
PSM)→Sleep (+ENTER SLEEP)
Here current is more if baudrate is 19200 and same setup @115200 seems ok ,I can understand that it may not be baud rate but some sleep sequence or delay .Now after above sequence if we give failing edge on Rxd_Modem it wake up modem from deep sleep and after 10 second it reenter deep sleep and now current consumption is ok ,and if nex time when we fully wake up to exchange data again current value is not ok[it varies from PCB to PCB]