BQ2012 datasheet(6/20 Pages) TI

6 / 20 page

Example: Selecting a PFC Value

Given:

Sense resistor = 0.1

Ω

Number of cells = 6

Capacity = 2200mAh, NiCd battery

Current range = 50mA to 2A

Absolute display mode

Serial port only

Self-discharge = C

Voltage drop over sense resistor = 5mV to 200mV

Therefore:

2200mAh * 0.1Ω = 220mVh

Select:

PFC = 33792 counts or 211mVh

PROG1 = float

PROG2 = float

PROG3 = float

PROG4 = low

PROG5 = float

PROG6 = float

The initial full battery capacity is 211mVh

(2110mAh) until the bq2012 “learns” a new capac-

ity with a qualified discharge from full to EDV1.

bq2012

PROGx

Programmed

Full

Count

(PFC)

PROG4 = L

PROG4 = Z

Units

PROG3 = H

PROG3 = Z

PROG3 = L PROG3 = H PROG3 = Z

PROG3 = L

Scale =

1/80

Scale =

1/160

Scale =

1/320

Scale =

1/640

Scale =

1/1280

Scale =

1/2560

mVh/

count

49152

614

307

154

76.8

38.4

19.2

mVh

45056

563

282

141

70.4

35.2

17.6

mVh

40960

512

256

128

64.0

32.0

16.0

mVh

36864

461

230

115

57.6

28.8

14.4

mVh

33792

422

211

106

53.0

26.4

13.2

mVh

30720

384

192

96.0

48.0

24.0

12.0

mVh

27648

346

173

86.4

43.2

21.6

10.8

mVh

25600

320

160

80.0

40.0

20.0

10.0

mVh

22528

282

141

70.4

35.2

17.6

8.8

mVh

VSR is equivalent to 2

counts/sec. (nom.)

22.5

11.25

5.56

2.8

Table 2. bq2012 Programmed Full Count mVh Selections

Connection

PROG5

Self-Discharge Rate

PROG6

Display Mode

DISP

Display State

Self-discharge disabled

NAC = PFC on reset

LED disabled

NAC

Absolute

LED enabled on discharge when

VSRO < -4mV or during a valid charge

NAC

Relative

LED on

Note:

PROG5 and PROG6 states are independent.

Table 1. bq2012 Programming

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