ATmega32HVB datasheet(110/273 Pages) ATMEL

110 / 273 page

110

8042A–AVR–07/09

ATmega16HVB/32HVB

Figure 19-3. Accumulation Current Conversions

19.4

Regular Current Detection Operation

By setting the CADSE bit in CADCSRA the CC-ADC will enter a special Regular Current Detec-

tion Sampling Mode.

In this mode the CC-ADC will do one Instantaneous Current Conversion on regular sampling

intervals while updating of the Accumulation Current Register is automatically disabled. The

sampling interval is controlled by writing to the CADSI bits in CADCSRA.

Each time a conversion is completed the result is compared with Regular Charge/Discharge

Threshold levels specified in the CADRCC/CADRDC registers. If interrupt is enabled and the

voltage is above/below the specified limit a Regular Current Detection Interrupt will be issued.

Figure 19-4 illustrates the Regular Current Detection Mode.

Figure 19-4. Regular Current Detection Mode (CADSE=1)

19.5

Offset Canceling by Polarity Switching

The CC-ADC offers Polarity Switching for internal offset canceling. By switching the polarity of

the sampled input signal at selected time intervals, the internal voltage offset of the CC-ADC will

cancel at the output. This feature prevents the CC-ADC from accumulating an offset error over

time.

Enable

Accumulation

Interrupt

Accumulation

Data

INVALID DATA

DATA 1

DATA 2

DATA 3

DATA 5

Read byte 1

Read byte 2

Read byte 3

Read byte 4

125, 250, 500,

or 1000 ms

125, 250, 500,

or 1000 ms

1, 2, 3, or 4s settling

250, 500,

1000, or 2000 ms

Measure

Turn-off

~12ms

~250, 500, 1000, 2000ms

Measure

~12ms

Turn-off

~250, 500, 1000, 2000ms

Regular Current

Detection Operation

Regular Current

Detection Interupt

Regular Charge

Current Threshold

Regular Discharge

Current Threshold

Current through RSENSE

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