I am using RESET_IN_N low for 20ms to reset my HiloNCV2, HL6528RD and HL8518 when I get no answer from AT commands.
This works perfectly on HiloNCV2 and HL6528RD but not on HL8518.
With HL8518, after a RESET_IN_N low for 20ms, I get no more responses. I have to do a start up sequence in order to make it work again.
Any idea why it behaves so?
Please refer to the HL8518 PTS V9.0:
As RESET_IN_N is internally pulled up, a simple open collector or open drain transistor can be used to control it.
To reset the module, a low pulse must be sent on RESET pin during 10ms. In the meanwhile, PWR_ON signal must be in logic low.
Please do not link Reset signal pin to a level shifter which voltage level was provided by VGPIO.
when resetting the module, VGPIO collapses and reset gets a "strange" behavior which is not supported by the module.