ATXMEGA32D4-CU View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATXMEGA32D4-CU

8/16-bit Atmel XMEGA D4 Microcontroller

Atmel Corporation 

XMEGA D4

None, avoid using the ADC in the above configurations in order to prevent increased INL

error. Use the ADC in signed mode also for single ended measurements.

5. ADC gain stage output range is limited to 2.4V

The amplified output of the ADC gain stage will never go above 2.4V, hence the differential

input will only give correct output when below 2.4V/gain. For the available gain settings, this

gives a differential input range of:

– 1x gain:

– 2x gain:

– 4x gain:

– 8x gain:

– 16x gain:

– 32x gain:

– 64x gain:

2.4 V

1.2 V

0.6 V

300 mV

150 mV

75 mV

38 mV

Problem fix/Workaround

Keep the amplified voltage output from the ADC gain stage below 2.4V in order to get a cor-

rect result, or keep ADC voltage reference below 2.4V.

6. ADC Event on compare match non-functional

ADC signalling event will be given at every conversion complete even if Interrupt mode (INT-

MODE) is set to BELOW or ABOVE.

Problem fix/Workaround

Enable and use interrupt on compare match when using the compare function.

7. ADC propagation delay is not correct when 8x -64x gain is used

The propagation delay will increase by only one ADC clock cycle for 8x and 16x gain setting,

and 32x and 64x gain settings.

Problem fix/Workaround

None

8. Bandgap measurement with the ADC is non-functional when VCC is below 2.7V

The ADC can not be used to do bandgap measurements when VCC is below 2.7V.

Problem fix/Workaround

None.

9. Accuracy lost on first three samples after switching input to ADC gain stage

Due to memory effect in the ADC gain stage, the first three samples after changing input

channel must be disregarded to achieve 12-bit accuracy.

Problem fix/Workaround

Run three ADC conversions and discard these results after changing input channels to ADC

gain stage.

8135L–AVR–06/12

122

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