SPC560D Power consumption

[philipp239955_stm1_stmicro]

Posted on April 05, 2016 at 13:16

Hi Community

I have some issues/questions about the power consumption of the SPC560D40L1 CPU.

 I found this document on the ST-Website

http://www.st.com/st-web-ui/static/active/en/resource/technical/document/application_note/CD00291326.pdf

There the STANDBY mode is described with max. 300µA and min with 21µA.

Is it possible to reach the 21µA power consumption, without an external Oscillator, because I cannot find any register to enable the 128khz oscillator as system clock during STANDBY mode? I mean if I disable the FIRC the CPU has no clock anymore?

Kind regards

Philipp

[Erwan YVIN]

Posted on April 19, 2016 at 09:28

Hello Philipp ,

Sorry for the late answer ,

there are 2 registers :

SIRC_CTL with bit SIRCON_STDBY to disable SIRC in STANDBY MODE

SIRCON_STDBY 

SIRC control in STANDBY mode.

0 SIRC is switched off in STANDBY mode.

1 SIRC is switched on in STANDBY mode.

FIRC_CTL with bit FIRCON_STDBY to disable FIRC 

FIRCON_STDBY

FIRC control in STANDBY mode.

0 FIRC is switched off in STANDBY mode.

1 FIRC is in STANDBY mode.

There is no clock anymore ..

you need to use a WAKEUP Interrupt to go out from STANDBY mode.

       Best regards

             Erwan

[philipp239955_stm1_stmicro]

Posted on April 22, 2016 at 08:41

Hi Erwan, 

Thanks for your reply. Yes the missing information for me was that the CPU does not need a clock source during STANDBY. However thank you for your reply. Now i can reach the 30µA Standby current. 

kind regards

Philipp