Datasheet

[Not recommended for new designs - Use XMEGA A1U series] XMEGA A1 [DATASHEET]

8067O–AVR–06/2013

Problem fix/Workaround

Do a write to any AWeX I/O register to re-enable the output.

13. BOD will be enabled after any reset

If any reset source goes active, the BOD will be enabled and keep the device in reset if the VCC voltage is below

the programmed BOD level. During Power-On Reset, reset will not be released until VCC is above the pro-

grammed BOD level even if the BOD is disabled.

Problem fix/Workaround

Do not set the BOD level higher than VCC even if the BOD is not used.

14. BODACT fuse location is not correct

The fuses for enabling BOD in active mode (BODACT) are located at FUSEBYTE2, bit 2 and 3 and not in FUSE-

BYTE 5 as described in the XMEGA A Manual.

Problem fix/Workaround

Access the fuses in FUSEBYTE2.

15. Sampled BOD in Active mode will cause noise when bandgap is used as reference

Using the BOD in sampled mode when the device is running in Active or Idle mode will add noise on the bandgap

reference for ADC, DAC and Analog Comparator.

Problem fix/Workaround

If the bandgap is used as reference for either the ADC, DAC or Analog Comparator, the BOD must not be set in

sampled mode.

16. DAC has up to ±10 LSB noise in Sampled Mode

The DAC has noise of up to ±10 LSB in Sampled Mode for entire operation range.

Problem fix/Workaround

Use the DAC in continuous mode.

17. DAC is nonlinear and inaccurate when reference is above 2.4V or VCC - 0.6V

Using the DAC with a reference voltage above 2.4V or VCC - 0.6V will give inaccurate output when converting

codes that give below 0.75V output:

 ±10 LSB for continuous mode

 ±200 LSB for Sample and Hold mode

Problem fix/Workaround

None.