ATXMEGA32A4-CU データシートの表示（PDF） - Atmel Corporation
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ATXMEGA32A4-CU Datasheet PDF : 107 Pages
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XMEGA A4
8069O–AVR–08/10
– 1x gain:
– 2x gain:
– 4x gain:
– 8x gain:
– 16x gain:
– 32x gain:
– 64x gain:
2.4 V
1.2 V
0.6 V
300 mV
150 mV
75 mV
38 mV
Problem fix/Workaround
Keep the amplified voltage output from the ADC gain stage below 2.4 V in order to get a cor-
rect result, or keep ADC voltage reference below 2.4 V.
4. Bandgap measurement with the ADC is non-functional when VCC is below 2.7V
The ADC cannot be used to do bandgap measurements when VCC is below 2.7V.
Problem fix/Workaround
If internal voltages must be measured when VCC is below 2.7V, measure the internal 1.00V
reference instead of the bandgap.
5. 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 programmed 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.
6. ADC has increased INL error for some operating conditions
Some ADC configurations or operating condition will result in increased INL error.
In signed mode INL is increased to:
– 6 LSB for sample rates above 1 Msps, and up to 8 LSB for 2 Msps sample rate.
– 6 LSB for reference voltage below 1.1V when VCC is above 3.0V.
– 20 LSB for ambient temperature below 0 degree C and reference voltage below 1.3V.
In unsigned mode, the INL is increased up to a factor of 3 for the conditions above.
Problem fix/Workaround
None, avoid using the ADC in the above configurations in order to prevent increased INL
error.
7. DAC has increased INL or noise for some operating conditions
Some DAC configurations or operating condition will result in increased output error.
– INL error is increased up to 35 LSB when VCC < 2.0V
– Enabling Sample and Hold, will increase noise and reduce resolution below 8 bit
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