SPWF04: Need a pull down at RTS

florian239955_st · ‎2018-03-02

Posted on March 02, 2018 at 16:34

Hi,

I changed on my hardware the SPWF01 against a SPWF04 module. I communicate with the module via a STM32. If I use the SPWF04 module, I need a pull down resistor at the SPWF RTS output to get the communication working. I wonder why? Any ideas?

BR,

Flow

Tia Meng · ‎2018-04-02

Posted on April 03, 2018 at 01:10

We have a customer using

SPWF04 recently and found this module when running at standby mode would draw around >1mA current rather than uA level mentioned in the datasheet. They were using SPWF01 before and did not see this problem. May I know if SPWF04 could be a compatible replacement for SPWF01, any notice/tips for Hardware redesign or AT comment settings? I have asked them to pull down some GPIO externally e.g. GPIO7,8,9, but standby current is mA. Thanks.

Elio Cometti · ‎2018-04-04

Posted on April 04, 2018 at 11:26

Hello Flow,

the SPWF RTS output is not driven when HW flow control is disabled (console_hwfc=0).

Please verify the HW flow control is enabled on both SPWF and host micro, or HW flow control is disabled on both SPWF and host micro.

Regards,

Elio