MAX17843 datasheet(39/131 Pages) MAXIM

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Acquisition Time

The total acquisition time can be calculated by summing all the required processes, as shown in Table 10 and Table 11.

There is one measurement cycle per oversample.

Table 10. Acquisition Time

Table 11. Acquisition Time Examples (with AINCFG[5:0] = 00h)

PROCESS

TIME (µs)

CONDITION

FREQUENCY

Initialization

Always

Once per acquisition

VBLKP measurement

If VBLKP is enabled

Every measurement cycle

Cell scan setup

12.5

If cell input(s) enabled and VBLKP enabled

If cell input(s) enabled and VBLKP disabled

Cell scans

9 x n

For n = Number of enabled cell inputs

Diagnostic

measurement

(if enabled)

11.4

If zero-scale ADC output diagnostic enabled

11.4

If full-scale ADC output diagnostic enabled

86.2

If VALTREF diagnostic enabled

86.2

If die temperature diagnostic enabled

22.9

If any other diagnostic mode enabled

AUXIN measurement

(if enabled)

If AUXIN1 is enabled

Once per acquisition

6µs x AINCFG[5:0]

If AUXIN2 is enabled

6µs x AINCFG[5:0]

HV recovery (if

oversampling enabled)

100.3 x m

For m = Number of oversamples

After every measurement

cycle except the last

ENABLED MEASUREMENTS

NO OVERSAMPLING

FOUR OVERSAMPLES

EIGHT OVERSAMPLES

12 cells

141.0µs

825.9µs

1739.1µs

12 cells, VBLKP

160.5µs

903.9µs

1895.1µs

12 cells, AUXIN1 and AUXIN2

161.0µs

845.9µs

1759.1µs

12 cells, VBLKP, AUXIN1 and AUXIN2

180.5µs

923.9µs

1915.1µs

12 cells, VBLKP, die temperature, AUXIN1

and AUXIN2

266.7µs

1268.7µs

2604.7µs

MAX17843

12-Channel, High-Voltage Smart Sensor

Data-Acquisition Interface

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