BQ2016 Datasheet, PDF (10/21 Pages) Texas Instruments – GAS GAUGE IC FOR HIGH DISCHARGE RATES

bq2016
GAS GAUGE IC FOR
HIGH DISCHARGE RATES
SLUS475A– JANUARY 2001 – REVISED NOVEMBER 2002
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
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
LOWER
0/32
2/32
4/32
6/32
8/32
10/32
12/32
14/32
16/32
18/32
20/32
22/32
24/32
26/32
28/32
30/32
NOMINAL
THRESHOLD
(VCC)
≤ 1/32 <
≤ 3/32 <
≤ 5/32 <
≤ 7/32 <
≤ 9/32 <
≤ 11/32 <
≤ 13/32 <
≤ 15/32 <
≤ 17/32 <
≤ 19/32 <
≤ 21/32 <
≤ 23/32 <
≤ 25/32 <
≤ 27/32 <
≤ 29/32 <
≤ 31/32 ≤
UPPER
2/32
4/32
6/32
8/32
10/32
12/32
14/32
16/32
18/32
20/32
22/32
24/32
26/32
28/32
30/32
32/32
PFC
(COUNT)
30720
25344
41472
33792
27648
46080
36864
30720
39936
46080
27648
33792
39936
47616
28416
33792
SCALE
(mVh/
COUNT)
1/2560
1/2560
1/5120
1/5120
1/5120
1/10240
1/10240
1/10240
1/10240
1/10240
1/5120
1/5120
1/5120
1/5120
1/2560
1/2560
CAPACITY
(mVh)
OVERLOAD
THRESHOLD
(mV)
12.0
50
9.9
50
8.1
50
6.6
50
5.4
30
4.5
30
3.6
30
3.0
30
3.9
30
4.5
30
5.4
30
6.6
30
7.8
50
9.3
50
11.1
50
13.2
50
Rv
(kΩ)
Open
1000
1000
1000
1000
1000
1000
1000
887
681
523
392
280
187
102
0
Rg
(kΩ)
CHEMISTRY
0
102
187
280
392
523
681
887
1000
1000
1000
1000
1000
1000
1000
Open
NiCd
NiCd
NiCd
NiCd
NiCd
NiCd
NiCd
NiCd
NiMH
NiMH
NiMH
NiMH
NiMH
NiMH
NiMH
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.
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