Datasheet
38. Errata
38.1 Rev. A
1. Reduced ADC accuracy for V
dd
from 2.7V to 4.1V.
Description: • DNL less than -1 (missing codes) can be observed for ADC codes 256,
512 and 768.
• Increased gain error.
Fix/Workaround: Use V
dd
below 2.7V or above 4.1V if accurate ADC is needed.
38.2 Rev. B
1. Reading flash immediately after chip erase using external programming interface may show
incorrect data on low supply voltages (VCC<3V)
Description: If Chip Erase is performed at low supply voltage (VCC<3V), a flash read
performed immediately after the chip erase (within 500ms) may show wrong
results.
Fix/Workaround:
If chip erase is executed at a low voltage, wait for 500ms before reading the
flash contents.
2. Writing lock bits using SPM command causes next SPM instruction not to be performed
Description: After writing memory lock bits, first subsequent flash or EEPROM erase or write
could fail. Writing the lock bits or boot lock bits from SW will cause the direct
subsequent flash or EEPROM write not to be performed.
Fix/
Workaround:
After any memory lock bits are written, perform a dummy-write to any flash or
EEPROM location. Data should contain all 1’s to avoid changing the content.
Wait until RWWSB bit in SPMCSR and EEPE bit in EECR register becomes
zero. Powering off the device after memory lock bits are written will also resolve
the problem.
3. Clock Failure Detection (CFD) doesn't resume back to original clock with external reset
Description: If clock failure has occurred when CFD is enabled and device is operating with
1 MHz fallback clock then external reset doesn't cause the system to try to
resume back to its original clock source.
Fix/Workaround:
Power-On-Reset can be used to resume back to original clock if clock failure
has occurred.
4. If the Peripheral Touch Controller (PTC) is enabled in sleep mode, the PTC might stop working.
Description: If the Peripheral Touch Controller (PTC) is enabled in sleep mode, the PTC
might stop working.
Fix/Workaround:
Use QTouch Library version 5.0.8 or later.
OR
ATmega328PB
Errata
© 2018 Microchip Technology Inc.
Datasheet Complete
DS40001906C-page 456