ATXMEGA32D4-CU View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATXMEGA32D4-CU

8/16-bit Atmel XMEGA D4 Microcontroller

Atmel Corporation 

8135L–AVR–06/12

XMEGA D4

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

1 µs 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 VCC voltage scaler in the Analog Comparators is non-linear.

Figure 34-1. Analog Comparator Voltage Scaler vs. Scalefac.

T = 25°C.

3.5

3

2.5

3.3V

2.7V

2

1.8V

1.5

1

0.5

0

0 5 10 15 20 25 30 35 40 45 50 55 60 65

SCALEFAC

Problem fix/Workaround

Use external voltage input for the analog comparator if accurate voltage levels are needed

3. ADC gain stage cannot be used for single conversion

The ADC gain stage will not output correct result for single conversion that is triggered and

started from software or 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 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:

– 6LSB for sample rates above 130ksps, and up to 8LSB for 200ksps sample rate.

– 6LSB for reference voltage below 1.1V when VCC is above 3.0V.

– 20LSB for ambient temperature below 0 degree C and reference voltage below 1.3V.

In unsigned mode, the INL error cannot be guaranteed, and this mode should not be used.

Problem fix/Workaround

121

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