ADBMS1818ASWZ-R7 datasheet(7/92 Pages) AD

7 / 92 page

Data Sheet

ADBMS1818

SPECIFICATIONS

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Rev. B | 7 of 92

Table 3. (Continued)

Parameter

Test Conditions/Comments

Min

Typ

Max

Unit

Watchdog Timer Pin Low (VOL(WDT))

WDT pin sinking 4 mA, apply over the full specified

temperature range

0.4

General-Purpose I/O Pin Low (VOL(GPIO))

GPIO pin sinking 4 mA (used as digital output), apply over

the full specified temperature range

0.4

1 The active state current is calculated from dc measurements. The active state current is the additional average supply current into VREG when there are continuous 1 MHz

communications on the isoSPI ports with 50% data 1s and 50% data 0s. Slower clock rates reduce the supply current.

ADC TIMING SPECIFICATIONS

Table 4.

Parameter

Test Conditions/Comments

Min

Typ

Max

Unit

(tCYCLE) (See Figure 55, Figure 56, and Figure 58)

Measurement and Calibration Cycle Time When

Starting from the REFUP State in Normal Mode

Measure 18 cells, apply over the full specified temperature

range

2027

2343

2488

µs

Measure 3 cells, apply over the full specified temperature range 352

407

432

µs

Measure 18 cells and 2 GPIO inputs, apply over the full

specified temperature range

2717

3140

3335

µs

Measurement and Calibration Cycle Time When

Starting from the REFUP State in Filtered Mode

Measure 18 cells, apply over the full specified temperature

range

174.2

201.3

213.8

Measure 3 cells, apply over the full specified temperature range 29.1

33.6

35.7

Measure 18 cells and 2 GPIO inputs, apply over the full

specified temperature range

232.3

268.5

285.1

Measurement and Calibration Cycle Time When

Starting from the REFUP State in Fast Mode

Measure 18 cells, apply over the full specified temperature

range

970

1121

1191

µs

Measure 3 cells, apply over the full specified temperature range 176

203

215

µs

Measure 18 cells and 2 GPIO inputs, apply over the full

specified temperature range

1307

1511

1605

µs

Skew Time (tSKEW1). The Time Difference

Between Cell 18 and GPIO1 Measurements,

Command = ADCVAX (See Figure 58)

Fast mode, apply over the full specified temperature range

168

194

206

µs

Normal mode, apply over the full specified temperature range

470

543

577

µs

Skew Time(tSKEW2). The Time Difference Between

Cell 18 and Cell 1 Measurements, Command =

ADCV (See Figure 55)

Fast mode, apply over the full specified temperature range

202

233

248

µs

Normal mode, apply over the full specified temperature range

580

670

711

µs

Regulator Start-Up Time (tWAKE)

VREG generated from the DRIVE pin (see Figure 93), apply over

the full specified temperature range

200

400

µs

Watchdog or Discharge Timer (tSLEEP) (See Figure

87)

DTEN pin = 0 or DCTO, Bits[3:0] = 0000, apply over the full

specified temperature range

1.8

2.2

sec

DTEN pin = 1 and DCTO, Bits[3:0] ≠ 0000

0.5

120

min

Reference Wake-Up Time (tREFUP (See Figure

55)). Added to tCYCLE Time When Starting from

the Standby State. tREFUP = 0 When Starting from

Other States

tREFUP is independent of the number of channels measured and

the ADC mode, apply over the full specified temperature range

2.7

3.5

4.4

ADC Clock Frequency (fS)

3.3

MHz

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