Skip to main content
den2life
den2life
Associate II
October 5, 2015
Question

Stm32101t8U6 rtc no Vbat pin...

  • October 5, 2015
  • 3 replies
  • 722 views
Posted on October 05, 2015 at 19:52

How to be a STM32F101T8U6that does not have VBAT pin, if the VBAT pin by VDD, then how to read the time after SHUTDOWN MODE the STM32F101T8U6.

#rtc #rtc
This topic has been closed for replies.

3 replies

Tesla DeLorean
Tesla DeLorean
Guru
October 5, 2015
Posted on October 05, 2015 at 20:29

Does the VDD supply disappear?

Does the board have an LSE crystal?

VBAT pin has VDD attached, or not?

STANDBY? STOP?

Wouldn't you just enable/unlock the PWR/RTC peripheral and read the current register content?

Tips, Buy me a coffee, or three.. PayPal Venmo (See Profile) Up vote any posts that you find helpful, it shows what's working..
den2life
den2lifeAuthor
Associate II
October 6, 2015
Posted on October 06, 2015 at 15:28

I do not

use

an external

oscillator LSE,

internal LSI

use

.

After the go of

the STM32F101T8U6

into standby mode

includes a button WKUP

and read

the RTC-CTL and CTH

, but

it is zero

,

and the

battery

is not disconnected

, that is,

do not leave

without

power supply

CPU.

What to do?

But

no

VBAT,

it is connected

to the

inside of

the VDD

?

How to

use the clock

to

when entering

STANDBY

mode

,

the clock is ticking

?

Tesla DeLorean
Tesla DeLorean
Guru
October 6, 2015
Posted on October 06, 2015 at 16:14

There is no internal connection, when the internal regulator turns off it switches to VBAT, so you'd want that connected to some external supply. Should be a diagram of the low power domain, what's connected to it, and how the switch is arranged, in the manuals.

I haven't looked over any unique F101 features, but on the F103 the LSI was not in the low power domain.

Tips, Buy me a coffee, or three.. PayPal Venmo (See Profile) Up vote any posts that you find helpful, it shows what's working..
Terms & ConditionsAccessibility statement