ADBMS1818ASWZ-R7 datasheet(59/89 Pages) AD

59 / 89 page

Data Sheet

ADBMS1818

THEORY OF OPERATION

analog.com

Rev. 0 | 59 of 89

Table 51. Command Bit Descriptions

Name

Description

Values

MD, Bits[1:0]

ADC Mode

ADCOPT(CFGAR0, Bit 0) = 0

ADCOPT(CFGAR0, Bit 0) = 1

422 Hz mode

1 kHz mode

27 kHz mode (fast)

14 kHz mode

7 kHz mode (normal)

3 kHz mode

26 Hz mode (filtered)

2 kHz mode

DCP

Discharge Permitted

DCP

Discharge Not Permitted

Discharge Permitted

CH, Bits[2:0]

Cell Selection for

ADC Conversion

Total Conversion Time in the 8 ADC Modes

27 kHz

14 kHz

7 kHz

3 kHz

2 kHz

1 kHz

422 Hz

26 Hz

000

All cells

1.1 ms

1.3 ms

2.3 ms

3.0 ms

4.4 ms

7.2 ms

12.8 ms

201 ms

001

Cells 1, 7, 13

203 μs

232 μs

407 μs

523 μs

756 μs

1.2 ms

2.2 ms

34 ms

010

Cells 2, 8, 14

203 μs

232 μs

407 μs

523 μs

756 μs

1.2 ms

2.2 ms

34 ms

011

Cells 3, 9, 15

203 μs

232 μs

407 μs

523 μs

756 μs

1.2 ms

2.2 ms

34 ms

100

Cells 4, 10, 16

203 μs

232 μs

407 μs

523 μs

756 μs

1.2 ms

2.2 ms

34 ms

101

Cells 5, 11, 17

203 μs

232 μs

407 μs

523 μs

756 μs

1.2 ms

2.2 ms

34 ms

110

Cells 6, 12, 18

203 μs

232 μs

407 μs

523 μs

756 μs

1.2 ms

2.2 ms

34 ms

PUP

Pull-Up/Pull- Down

Current for Open

Wire Conversions

PUP

Pull-down current

Pull-up current

ST, Bits[1:0]

Self Test Mode

Selection

Self Test Conversion Result

27 kHz

14 kHz

7 kHz

3 kHz

2 kHz

1 kHz

422 Hz

26 Hz

Self Test 1

0x9565

0x9553

0x9555

Self test 2

0x6A9A

0x6AAC

0x6AAA

CHG, Bits[2:0]

GPIO Selection for

ADC Conversion

Total Conversion Time in the 8 ADC Modes

CHG

27 kHz

14 kHz

7 kHz

3 kHz

2 kHz

1 kHz

422 Hz

26 Hz

000

GPIO1 to

GPIO5, 2nd

Reference,

GPIO6 to

GPIO9

1.8 ms

2.1 ms

3.9 ms

5.0ms

7.4 ms

12.0 ms

21.3 ms

335 ms

001

GPIO1 and

GPIO6

380 μs

439 μs

788 μs

1.0 ms

1.5 ms

2.4 ms

4.3 ms

67.1 ms

010

GPIO2 and

GPIO7

380 μs

439 μs

788 μs

1.0 ms

1.5 ms

2.4 ms

4.3 ms

67.1 ms

011

GPIO3 and

GPIO8

380 μs

439 μs

788 μs

1.0 ms

1.5 ms

2.4 ms

4.3 ms

67.1 ms

100

GPIO4 and

GPIO9

380 μs

439 μs

788 μs

1.0 ms

1.5 ms

2.4 ms

4.3 ms

67.1 ms

101

GPIO5

200 μs

229 μs

403 μs

520 μs

753 μs

1.2 ms

2.1 ms

34 ms

110

2nd Reference

200 μs

229 μs

403 μs

520 μs

753 μs

1.2 ms

2.1 ms

34 ms

CHST,

Bits[2:0]1

Status Group

Selection

Total Conversion Time in the 8 ADC Modes

CHST

27 kHz

14 kHz

7 kHz

3 kHz

2 kHz

1 kHz

422 Hz

26 Hz

000

SC, ITMP, VA,

742 μs

858 μs

1.6 ms

2.0 ms

3.0 ms

4.8 ms

8.5 ms

134 ms

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