strange current consumption

developer2 · ‎2013-07-21

Posted on July 21, 2013 at 12:56

Hi All,

i have issue with current on STM32F417 (100pins) :(

when i connect power and BOOT0 is set to run into STM's bootloader i have power consumption 88mA,

and when i jump into my program i have 120mA :(

i have connected but not initialized ULPI interface and other peripherals,

peripherals that are working correctly and was tested are

USART1, USART6, SPI3, and some GPIOs,

could you help me please how to identify where is something wrong ?

Thanks for all replies,

Tesla DeLorean · ‎2013-07-21

Posted on July 21, 2013 at 13:34

That does seem rather excessive, is this a current you can measure to the chip, or a board level draw?

Perhaps you can enumerate or diagram how you have the pins connected, and to what. I'd start by looking at all the supply pins, and the VCAPx pins.

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developer2 · ‎2013-07-21

Posted on July 21, 2013 at 13:55

i measure after 3.3V voltage regulator at ''board level'', but stm32f417 chip is getting hot very fast,

on Vcap i have 2.2uF capacitors and i'm measuring 1.257V on both,

Vbat is not connected,

Vref+ has voltage reference 2.5V

3.3V net is on pins: Vdda(22) Vdd (11,19, 28, 50, 75, 100)

GND net is on pins: Vssa(20) Vss (10, 27, 74, 99)

JTAG as interface is not used, and jtag pins are used as GPIO or not connected,

BOOT0 is through 10k to 3.3V

BOOT1 is through 10k to GND

and other pins in bootloader mode should be ''disconnected'' internally, so they should be configured as input and it's not the option for high current , isn't it ?

Kind regards,

megahercas6 · ‎2013-07-21

Posted on July 21, 2013 at 14:08

Crosscheked with MicroXplorer pin config, and looks like right, i would connect VBAT to 3.3V, it can't hurt.

I hope you are not suing USB VBUS pin ( like in some devkits, they connect 5V to VUSB PIN (PAx, or other), and if you enable it, it will cause you some problems with power consumption)

developer2 · ‎2013-07-21

Posted on July 21, 2013 at 14:25

currently i have connected only 3.3V after regulator, so input of regulator is not connected, and all usb and ulpi are disconnected,

nothing else is going to the board,

i tried Vbat to connect to 3.3V , but no change,

developer2 · ‎2013-07-21

Posted on July 21, 2013 at 15:40

Does anybody having experiences with UTMI/ULPI USB3300 ?

i would try to sleep it until i find real consumption ...

developer2 · ‎2013-07-21

Posted on July 21, 2013 at 19:01

well, i removed ULPI, high current consumption was caused by this chip :(

thanks for help to all who was trying to help me ...