ATXMEGA256D3 Datasheet, PDF (88/98 Pages) ATMEL Corporation – 8/16-bit AVR XMEGA D3 Microcontroller

XMEGA D3
33. Errata
33.1 ATxmega256D3, ATxmega192D3, ATxmega128D3, ATxmega64D3
33.1.1 rev. B
• Bandgap voltage input for the ACs cannot be changed when used for both ACs simultaneously
• Bandgap measurement with the ADC is non-functional when V_CC is below 2.7V
• ADC gain stage cannot be used for single conversions
• ADC gain stage output range is limited to 2.4V
• ADC propagation delay not correct when 8x-6x gain is used
• ADC has increased INL error for some operating conditions
• BOD will be enabled after any reset
• Writing EEPROM or Flash while reading any of them will not work
• VCC voltage scaler for AC is non-linear
• Maximum operating frequency below 1.76V is 8 MHz
• TWIE is not available
• Inverted I/O enable does not affect Analog Comparator Output
1. 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.
2. Bandgap measurement with the ADC is non-functional when V_CC is below 2.7V
The ADC cannot be used to do bandgap measurements when V_CC is below 2.7V.
Problem fix/Workaround
If internal voltages must be measured when V_CC is below 2.7V, measure the internal 1.00V
reference instead of the bandgap.
3. ADC gain stage cannot be used for single conversion
The ADC gain stage will not output correct result for single conversions that is triggered and
started from software or the event system.
Problem fix/Workaround
When the gain stage is used, the ADC must be set in free running mode for correct results.
4. 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:
88
8134G–AVR–08/10