ATXMEGA384A1-CU ATMEL [ATMEL Corporation], ATXMEGA384A1-CU Datasheet - Page 73

• Manufacturer Part Number: ATXMEGA384A1-CU
• Description: 8/16-bit XMEGA A1 Microcontroller
• Manufacturer: ATMEL [ATMEL Corporation]

36. Errata
36.1
8067D–AVR–08/08
ATxmega128A1 rev. G
1. Bootloader Section in Flash is non-functional
2. Bandgap voltage input for the ACs cannot be changed when used for both ACs
3. DAC is nonlinear and inaccurate when reference is above 2.4V
4. ADC gain stage output range is limited to 2.6 V.
The Bootloader Section is non-functional, and bootloader or application code cannot reside
in this part of the Flash.
Problem fix/Workaround
None, do not use the Bootloader Section.
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.
Using the DAC with a reference voltage above 2.4V give inaccurate output when converting
codes that give below 0.75V output:
– ±20 LSB for continuous mode
– ±200 LSB for Sample and Hold mode
Problem fix/Workaround
None, avoid using a voltage reference above 2.4V.
The amplified output of the ADC gain stage will never go above 2.6V, hence the differential
input will only give correct output when below 2.6V/gain. For the available gain settings, this
gives a differential input range of:
– 1X gain: 2.6V
– 2X gain: 1.3V
– 4X gain: 0.65V
– 8X gain: 325 mV
– 16X gain: 163 mV
– 32X gain: 82 mV
– 64X gain: 41 mV
Problem fix/Workaround
Keep the amplified voltage output from the ADC gain stage below 2.6V in order to get a cor-
rect result, or keep ADC voltage reference is below2.6V.
XMEGA A1
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