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BQ2050 Datasheet(PDF) 6 Page - Texas Instruments

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Part No. BQ2050
Description  Lithium Ion Power Gauge™ IC
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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BQ2050 Datasheet(HTML) 6 Page - Texas Instruments

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2.
Programmed Full Count (PFC) or initial bat-
tery capacity:
The initial LMD and gas gauge rate values are pro-
grammed by using PROG1–PROG4. The bq2050 is
configured for a given application by selecting a
PFC value from Table 2. The correct PFC may be
determined by multiplying the rated battery capac-
ity in mAh by the sense resistor value:
Battery capacity (mAh) * sense resistor (Ω) =
PFC (mVh)
Selecting a PFC slightly less than the rated capac-
ity provides a conservative capacity reference until
the bq2050 “learns” a new capacity reference.
Example: Selecting a PFC Value
Given:
Sense resistor = 0.05
Number of cells = 2
Capacity = 1000mAh, Li-Ion battery, coke-anode
Current range = 50mA to 1A
Relative display mode
Serial port only
Self-discharge = NAC
512 per day @ 25°C
Voltage drop over sense resistor = 2.5mV to 50mV
Nominal discharge voltage = 3.6V
Therefore:
1000mAh * 0.05Ω = 50mVh
6
bq2050
PROGx
Pro-
grammed
Full
Count
(PFC)
PROG4 = L
PROG4 = Z
Units
1
2
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
H
H
49152
614
307
154
76.8
38.4
19.2
mVh
H
Z
45056
563
282
141
70.4
35.2
17.6
mVh
H
L
40960
512
256
128
64.0
32.0
16.0
mVh
Z
H
36864
461
230
115
57.6
28.8
14.4
mVh
Z
Z
33792
422
211
106
53.0
26.4
13.2
mVh
Z
L
30720
384
192
96.0
48.0
24.0
12.0
mVh
L
H
27648
346
173
86.4
43.2
21.6
10.8
mVh
L
Z
25600
320
160
80.0
40.0
20.0
10.0
mVh
L
L
22528
282
141
70.4
35.2
17.6
8.8
mVh
VSR equivalent to 2
counts/sec. (nom.)
90
45
22.5
11.25
5.6
2.8
mV
Table 2. bq2050 Programmed Full Count mVh Selections
Pin
Connection
PROG5 Compensation/
Self-Discharge
PROG6
NAC on Reset
DISP
Display State
H
Table 4/Disabled
PFC
LEDs disabled
Z
Table 4/ NAC
512
0
LEDs on when charging
L
Table 3/ NAC
512
0
LEDs on for 4 sec.
Note:
PROG5 and PROG6 states are independent.
Table 1. bq2050 Programming


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