Atmel ARM-Based Evaluation Kit AT91SAM9N12-EK AT91SAM9N12-EK Data Sheet

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SAM9N12/SAM9CN11/SAM9CN12 [DATASHEET]

11063K–ATARM–05-Nov-13

The ADC is based on a 10-bit Analog-to-Digital Converter (ADC) managed by an ADC Controller. Refer to 

. It also integrates a 12-to-1 analog multiplexer,

making possible the analog-to-digital conversions of 12

 

analog lines. The conversions extend from 0V to the voltage

carried on pin ADVREF. 

The ADC supports the 8-bit or 10-bit resolution mode. The 8-bit resolution mode prevents from using 16-bit Peripheral
DMA transfer into memory when only 8-bit resolution is required by the application. Please note that using this low
resolution mode does not increase the conversion rate.

Conversion results are reported in a common register for all channels, as well as in a channel-dedicated register.

Software trigger, external trigger on rising edge of the ADTRG pin or internal triggers from Timer Counter output(s) are
configurable.

The comparison circuitry allows automatic detection of values below a threshold, higher than a threshold, in a given
range or outside the range, thresholds and ranges being fully configurable.

The ADC also integrates a Sleep Mode and a conversion sequencer and connects with a DMA channel. These features
reduce both power consumption and processor intervention.

Finally, the user can configure ADC timings, such as Startup Time and Tracking Time.

This ADC Controller includes a Resistive Touchscreen Controller. It supports 4-wire and 5-wire technologies.