Analog comparators in XMEGA D series (D4), is there a high speed mode and what are the power consumption characteristics?

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Reading through datasheet for D series (checking out and familiarizing ourselves with stuff) http://ww1.microchip.com/downloa... I've noticed the following:

 

High speed and low speed mode power consumption is specified for analog comparator only for 128D4 (page 126), the ATxmega64D4 has only high speed mode power consumption spelled out for AC on page 105, and the rest don't seem to have power consumption for AC stated at all.

 

Moreover, the D-manual http://ww1.microchip.com/downloa... does not mention HSMODE bit, and that bit is listed as RESERVED on page 257.

 

So, how should I interpret that?

Is HSMODE available on 128D4? Other D4 chips?

 

 If not, in what mode is it operating and what approximate power consumption hit should one expect?

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Churai wrote:
Is HSMODE available on 128D4?
No per 'iox128d4.h' and 'ATxmega128D4.atdf'

via https://packs.download.microchip.com/#collapse-Microchip-XMEGAD-DFP-pdsc (download, unzip, include/avr, atdf)

 

"Dare to be naïve." - Buckminster Fuller

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My recollection is that AVR comparators are synchronous. That is, they are clocked. It is not clear if XMega or Mega-0 devices also are. A careful reading of the spec sheet may have hints. For example, if there is a "spike reduction" circuit following the comparator, that IS clocked and introduces a delay of several clocks. 

 

Jim

Jim Wagner Oregon Research Electronics, Consulting Div. Tangent, OR, USA http://www.orelectronics.net

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gchapman wrote:

No per 'iox128d4.h' and 'ATxmega128D4.atdf'

 

via https://packs.download.microchip.com/#collapse-Microchip-XMEGAD-DFP-pdsc (download, unzip, include/avr, atdf)

 

Thanks. So... is there any way to get an idea what performance and power consumption characteristics of the D4's analog comparator are, or is it more like a case of "go with the A if it is of concern"?

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Churai wrote:
is there any way to get an idea what performance and power consumption characteristics of the D4's analog comparator are, ...
Measure it

MT-DB-X4 Atmel AVR XMEGA 44-pin AU/A/C/D USB development board (ie: ATxmega128a4u) - Development Boards (MattairTech)

 

"Dare to be naïve." - Buckminster Fuller