The BSTOUT pin of STPMIC1APQR already has a 5.2V voltage output, and the SWIN pin is directly connected to the BSTOUT pin, but SWOUT has no voltage output. what error will cause this problem?

YZhan.3 · ‎2020-07-15

First briefly introduce our motherboard. STM32MPU151AAC3 (361-pin TFBGA package) is used in our motherboard, and STPMIC1APQR is used in the power supply. At present, booting from Micro-SD card is normal, DDR3L and e.MMC are working normally.

Issue :

The BSTOUT pin of STPMIC1APQR already has a 5.2V voltage output, and the SWIN pin is directly connected to the BSTOUT pin, but SWOUT has no voltage output that supply USB-HOST VBUS. By the way, our circuit schematic refered to STPMIC157A-EV1 and has been reviewed by ST engineers. Our BSP engineers have configured the STPMIC USB power supply in the same way as the 157A-EV1.

Ask:

SWOUT has no voltage output, what error will cause this problem?

Olivier GALLIEN · ‎2020-09-25

Hi @YZhan.3

Quite an old post, sorry for late reply.

Supposed you find issue by yourself ?

Can you share finding and current status of project ?

Thx

Olivier

Olivier GALLIEN
In order to give better visibility on the answered topics, please click on 'Accept as Solution' on the reply which solved your issue or answered your question.