ADBMS1818CSWAZ-R7 datasheet(33/92 Pages) AD

33 / 92 page

Data Sheet

ADBMS1818

THEORY OF OPERATION

analog.com

Rev. B | 33 of 92

DATA ACQUISITION SYSTEM DIAGNOSTICS

The battery monitoring data acquisition system is comprised of the

multiplexers, ADCs, 1st reference, digital filters, and memory. To

ensure long term reliable performance, there are several diagnostic

commands that can be used to verify the proper operation of these

circuits.

Measuring Internal Device Parameters

(ADSTAT Command)

The ADSTAT command is a diagnostic command that measures

the following internal device parameters: Sum of all cells (SC),

internal die temperature (ITMP), analog power supply (VA), and

digital power supply (VD). These parameters are described in

Sum of All Cells Measurement section, Internal Die Temperature

Measurement section, and Power Supply Measurements section.

All 8 ADC modes described in the ADC Modes section are available

for these conversions. See the Commands section for the ADSTAT

command format. Figure 59 shows the timing of the ADSTAT

command measuring all 4 internal device parameters.

Table 25 shows the conversion time of the ADSTAT command

measuring all 4 internal parameters. t4C indicates the total conver-

sion time for the ADSTAT command.

Figure 59. Timing for ADSTAT Command Measuring SC, ITMP, VA, and VD

Table 25. Conversion and Synchronization Times for ADSTAT Command Measuring SC, ITMP, VA, and VD in Different Modes

Mode

Conversion Times (μs)

Synchronization Time (μs)

t1M

t2M

t3M

t4M

t4C

tSKEW

27 kHz

104

151

198

742

140

14 kHz

163

238

314

858

227

7 kHz

145

279

413

547

1556

402

3 kHz

261

512

762

1012

2022

751

2 kHz

494

977

1460

1943

2953

1449

1 kHz

960

1908

2857

3805

4814

2845

422 Hz

1890

3770

5649

7529

8538

5638

26 Hz

29,818

59,624

89,431

119,238

134,211

89,420

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