/var/www/restricted/ssh/stm32/www/stm32circle/ STM CircleOS forum / Power management circuit for STM32F103



# 1   2012-06-01 08:38:13 Power management circuit for STM32F103

New member
Registered: 2012-04-21
Posts: 8

Power management circuit for STM32F103

Dear all,

I need to design a board based on STM32F103RE.
My board need to be powered in two ways, USB & Li-Ion 3.7V battery. In addition i need to design a IN-BUILT battery charging circuit( USB to Li-Ion battery) for the board. When I attach battery, it should be automatically charged and kept in this state until the other power source (USB or external adapter) is removed and it should AUTOMATICALLY power the board - no jumpers, no switches!

I found the exact functional power_supply section in the following board schematics:

http://www.olimex.com/dev/DUINO/OLIMEXI … -STM32.pdf
http://www.olimex.com/dev/DUINO/OLIMEXI … _Rev_B.pdf

This  board has 3 power supply options. I need only two of them.

I also have iNEMO v2 Board from ST Microelectronics : http://www.st.com/internet/evalboard/product/250367.jsp
It has two power supply options, but a switch is used to select one of them. Moreover, it needs 5V DC supply if USB power not used.
In my case i want to use 3.7 Li-Ion/Li-Po battery when USB not used. I did not like the switch to select power source.
I liked auto switching power source of  OLIMEXINO-STM32 
If it is possible to just remove the DC-DC power supply(power input voltage from 9 to 30V DC) part of OLIMEXINO-STM32 it really suits me.
But i need to use SMD components to make my board as small as possible, like iNEMO v2.

I would like to request if you have any suggestions for me or
If you think you can solve my problem in few minutes & send circuit diagram, i will be very thankful.

Below are the power management circuits of two boards i mentioned:


Below I colored Part of the circuit in black which i do not need.( If the image is not visible properly, please save & see or copy image, paste into a microsoft paint program or similar).


Thank you

Last edited by harinath (2012-06-02 05:24:24)



# 2   2012-06-22 04:38:59 Power management circuit for STM32F103

New member
Registered: 2012-04-21
Posts: 8

Re: Power management circuit for STM32F103

Hello all,
I have finished doing the schematics for STM32 based board. Gerber files have been sent to fab house. Its time to wait.

I used similar circuit shown in the second Image. In the second image, they used two regulators, one for the digital power supply and the other for analog power supply. I used only 1 regulator for both.

Last edited by harinath (2012-06-22 04:41:02)



# 3   2013-10-28 21:11:39 Power management circuit for STM32F103

New member
Registered: 2013-10-28
Posts: 2

Re: Power management circuit for STM32F103

hello sir,
  plz, could tell us exactly procedure to do changes that u have to suggested in ua last reply?



Board footer