(SOLVED) datasheet mistake: idle current with analog comparator disabled (internal voltage reference off)

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Hello all,

I'm not a newbie..

 

I see in latest datasheet for tiny45 (rev. Q, 08/2013), section 22.2, Figure 22.10 that idle current at Vcc=3.5V, 128kHz should be around 68uA.

 

I measured 60uA. Close, ok. I used:

Peripherals off: timer1, usi, adc. On: timer0.

Note that analog comparator (AC) is on by default, you have to manually disable it. Enabled (=not disabled), it needs internal voltage reference, so it consumes power.

 

When I turned it off (so shutting down int. ref. volt.), I measured 17uA.

 

 

So.. it's not precisely a mistake in the datasheet, but clearly a confusion. Why they give plots with the AC (internal ref) on, and not specify this? And why they enable the AC in the first place? - while all the other peripherals are disabled by default. Here also.. AC is not listed in the section 22.3.. Or are those their measurements really more a mistake?

 

Addition, 22 sept 2014: How can I contact Atmel on this issue? (avr@atmel.com auto-replied that I should register on MyAtmel.. but there are only links to resources there, seems no way to contact them..)

 

UPDATE Oct 30 2014:

Confirmed by Atmel to be confusing.

 

Full appropriate reply - on the copy of my above description:

Hi,

I am able to reproduce the issue.

The current consumption is nearly about 60uA when Analog comparator is enabled and the current consumption decreases to 16uA when the Analog comparator is disabled.

I have reported this issue to our internal team and it will be clarified in the future release of the datasheet.

Hence, now I am marking this support case as closed.

Thanks & Regards
 

 

Last Edited: Tue. Jun 20, 2017 - 05:57 PM
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anyone?

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:: Morten

 

(yes, I work for Atmel, yes, I do this in my spare time, now stop sending PMs)