ATXMEGA32A4-CU View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATXMEGA32A4-CU

8/16-bit AVR® XMEGA A4 Microcontroller

Atmel Corporation 

XMEGA A4

36. Errata

36.1 ATxmega32A4 rev. A

• Flash Power Reduction Mode can not be enabled when entering sleep mode

• Bandgap voltage input for the ACs cannot be changed when used for both ACs simultaneously

• ADC gain stage output range is limited to 2.4V

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

• BOD will be enabled after any reset

• ADC has increased INL error for some operating conditions

• DAC has increased INL or noise for some operating conditions

• VCC voltage scaler for AC is non-linear

• Inverted I/O enable does not affect Analog Comparator Output

1. Flash Power Reduction Mode can not be enabled when entering sleep mode

If Flash Power Reduction Mode is enabled when a deep sleep mode, the device will only

wake up on every fourth wake-up request.

If Flash Power Reduction Mode is enabled when entering Idle sleep mode, the wake-up time

will vary with up to 16 CPU clock cycles.

Problem fix/Workaround

Disable Flash Power Reduction mode before entering sleep mode.

2. Bandgap voltage input for the ACs cannot be changed when used for both ACs

simultaneously

If the bandgap voltage is selected as input for one Analog Comparator (AC) and then

selected/deselected as input for the another AC, the first comparator will be affected for up

to 1 us and could potentially give a wrong comparison result.

Problem fix/Workaround

If the Bandgap is required for both ACs simultaneously, configure the input selection for both

ACs before enabling any of them.

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

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

input will only give correct output when below 2.4 V/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

93

8069O–AVR–08/10

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