ADBMS1818CSWAZ-R7 datasheet(32/92 Pages) AD

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Data Sheet

ADBMS1818

THEORY OF OPERATION

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Rev. B | 32 of 92

Auxiliary (GPIO) Measurements with Digital

Redundancy (ADAXD Command)

The ADAXD command operates similarly to the ADAX command

except that an additional diagnostic is performed using digital re-

dundancy. PS, Bits[1:0] in Configuration Register Group B must be

set to 0 or 1 during the ADAXD command to enable redundancy.

See the ADC Conversion with Digital Redundancy section.

The execution time of the ADAX command and the ADAXD com-

mand is the same.

Measuring Cell Voltages and GPIOs (ADCVAX

Command)

The ADCVAX command combines 18 cell measurements with 2

GPIO measurements (GPIO1 and GPIO2). This command simpli-

fies the synchronization of battery cell voltage and current measure-

ments when current sensors are connected to the GPIO1 or GPIO2

inputs. Figure 58 shows the timing of the ADCVAX command. See

the Commands section for the ADCVAX command format. The

synchronization of the current and voltage measurements, tSKEW1,

in fast mode is within 194 μs.

Table 24 shows the conversion and synchronization time for the

ADCVAX command in different modes. The total conversion time

for the command is given by t8C.

Figure 58. Timing of ADCVAX Command

Table 24. Conversion and Synchronization Times for ADCVAX Command in Different Modes

Mode

Conversion Times (μs)

Synchronization Time (μs)

t1M

t2M

t3M

t4M

t5M

t6M

t7M

t8M

t8C

tSKEW1

27 kHz

104

151

205

252

306

352

399

1511

194

14 kHz

163

238

321

397

480

556

632

1744

310

7 kHz

145

279

413

554

688

829

963

1097

3140

543

3 kHz

261

512

762

1020

1270

1527

1778

2028

4071

1008

2 kHz

494

977

1460

1,950

2433

2924

3407

3890

5933

1939

1 kHz

960

1908

2857

3812

4761

5717

6665

7613

9657

3801

422 Hz

1890

3770

5649

7536

9415

11,302

13,181

15,061

17,104

7525

26 Hz

29,818

59,624

89,431

119,245

149,052

178,866

208,672

238,479

268,450

119,234

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