Datasheet

373
XMEGA D3 [DATASHEET]
Atmel-8134N-ATxmega32D3-64D3-128D3-192D3-256D3-384D3_datasheet–03/2014
34.3.6 Rev. E
 Bandgap voltage input for the ACs can not be changed when used for both ACs simultaneously
 V
CC
voltage scaler for AC is non-linear
 ADC gain stage cannot be used for single conversion
 ADC has increased INL error for some operating conditions
 ADC gain stage output range is limited to 2.4V
 ADC Event on compare match non-functional
 ADC propagation delay is not correct when 8× – 64× gain is used
 Bandgap measurement with the ADC is non-functional when V
CC
is below 2.7V
 Accuracy lost on first three samples after switching input to ADC gain stage
 Configuration of PGM and CWCM not as described in XMEGA D Manual
 PWM is not restarted properly after a fault in cycle-by-cycle mode
 BOD will be enabled at any reset
 EEPROM page buffer always written when NVM DATA0 is written
 Pending full asynchronous pin change interrupts will not wake the device
 Pin configuration does not affect Analog Comparator Output
 NMI Flag for Crystal Oscillator Failure automatically cleared
 RTC Counter value not correctly read after sleep
 Pending asynchronous RTC-interrupts will not wake up device
 TWI Transmit collision flag not cleared on repeated start
 Clearing TWI Stop Interrupt Flag may lock the bus
 TWI START condition at bus timeout will cause transaction to be dropped
 TWI Data Interrupt Flag (DIF) erroneously read as set
 WDR instruction inside closed window will not issue reset
 Non available functions and options
 Sampled BOD in Active mode will cause noise when bandgap is used as reference
 Temperature sensor not calibrated
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 another AC, the first comparator will be affected for up to 1µs 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. VCC voltage scaler for AC is non-linear
The 6-bit V
CC
voltage scaler in the Analog Comparators is non-linear.