bq2016

GAS GAUGE IC FOR

HIGH DISCHARGE RATES

SLUS475A– JANUARY 2001 – REVISED NOVEMBER 2002

10

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

programmable configuration settings

design capacity

The battery’s rated design capacity or programmed full count (PFC) is programmed with the VPFC pin as shown

in Table 2, and represents the battery’s full reference. The VPFC pin is a 16-level input.

Table 2. PFC Selections

PFC

LEVEL

LOWER

NOMINAL

THRESHOLD

(VCC)

UPPER

PFC

(COUNT)

SCALE

(mVh/

COUNT)

CAPACITY

(mVh)

OVERLOAD

THRESHOLD

(mV)

Rv

(k

Ω)

Rg

(k

Ω)

CHEMISTRY

1

0/32

≤ 1/32 <

2/32

30720

1/2560

12.0

50

Open

0

NiCd

2

2/32

≤ 3/32 <

4/32

25344

1/2560

9.9

50

1000

102

NiCd

3

4/32

≤ 5/32 <

6/32

41472

1/5120

8.1

50

1000

187

NiCd

4

6/32

≤ 7/32 <

8/32

33792

1/5120

6.6

50

1000

280

NiCd

5

8/32

≤ 9/32 <

10/32

27648

1/5120

5.4

30

1000

392

NiCd

6

10/32

≤ 11/32 <

12/32

46080

1/10240

4.5

30

1000

523

NiCd

7

12/32

≤ 13/32 <

14/32

36864

1/10240

3.6

30

1000

681

NiCd

8

14/32

≤ 15/32 <

16/32

30720

1/10240

3.0

30

1000

887

NiCd

9

16/32

≤ 17/32 <

18/32

39936

1/10240

3.9

30

887

1000

NiMH

10

18/32

≤ 19/32 <

20/32

46080

1/10240

4.5

30

681

1000

NiMH

11

20/32

≤ 21/32 <

22/32

27648

1/5120

5.4

30

523

1000

NiMH

12

22/32

≤ 23/32 <

24/32

33792

1/5120

6.6

30

392

1000

NiMH

13

24/32

≤ 25/32 <

26/32

39936

1/5120

7.8

50

280

1000

NiMH

14

26/32

≤ 27/32 <

28/32

47616

1/5120

9.3

50

187

1000

NiMH

15

28/32

≤ 29/32 <

30/32

28416

1/2560

11.1

50

102

1000

NiMH

16

30/32

≤ 31/32 ≤

32/32

33792

1/2560

13.2

50

0

Open

NiMH

The correct PFC may be determined by multiplying the rated battery capacity in mAh by the sense-resistor

value:

Battery capacity (mAh)

× sense resistor (Ω) = PFC (mVh)

Selecting a PFC slightly less than the rated capacity provides a conservative capacity reference. The bq2016

stores the selected PFC in the PFC register.