Re: New STM8 Microcontroller from STMicroelectronics is ST7 Upgrade

"Eric Smith" <eric@xxxxxxxxxxxx> skrev i meddelandet
news:m3hcfsan13.fsf@xxxxxxxxxxxxxxxxxxxxxxxxxx
Ulf Samuelsson wrote:
Apparently it has quite high power consumption compared to let's say an
ARM7TDMI core 1.2 mW/MHz @ 3V vs 0.21 mW/MHz for ARM.
Uses up to 25 uA in sleep.

Hard to find an ARM microcontroller (or comparable performance non-ARM)
that draws much less than 25 uA in sleep. Even most of the Atmel
AT91SAM7x
parts seem to draw around that much, according to the data sheets.
For instance, AT91SAM7S family typical is 34.3 uA (Atmel document 6175H
dated
03-Dec-07, page 553).

And most of that 34 uA is coming from the on-chip regulator.
The core uses 4 uA (current measured over AMP2).

You can disable the internal LDO and use an external LDO which
would have an inherent power consumption of about 1 uA.
This would of course cost extra, and use more space.

You can also look at the new 1.8V AT91SAM7L :-)

The 25 uA, should however be compared to similar 8/16 bit micros
The X-Mega uses 1-2 uA in sleep with Brownout&RTC.

--
Best Regards,
Ulf Samuelsson
This is intended to be my personal opinion which may,
or may not be shared by my employer Atmel Nordic AB


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