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參數資料
| 型號： | AIC1781CS |
| 廠商： | Analog Integrations Corporation |
| 英文描述： | Battery Charge Controller |
| 中文描述： | 電池充電控制器 |
| 文件頁數： | 10/17頁 |
| 文件大?。?/td> | 423K |
| 代理商： | AIC1781CS |
AIC1781
10
Battery Voltage Measurement
The AIC1781 measures the battery voltage through
VBT pin, which is connected to battery positive
terminal through a resistor-divider network, as
shown in Fig. 3. The input voltage of SEL3 pin
determines the acceptable limit of divided battery
voltage.
V
BAT
RA
RB
C5
4
μ
F
2
R5
100K
C6
0
μ
F
AIC1781
VBT
+
Fig. 3
Battery Voltage Divider
For SEL3 > (V
CC
/2) + 0.4V, the suggested divider
resistance of RA and RB for the corresponding
number of battery cells are as below:
BATTERY
CELLS
RA/RB
RA (K
)
RB (K
)
2~4
2
240
120
3~6
3.3
300
91
4~8
4.9
300
62
5~10
6.4
300
47
6~12
7.8
310
39
8~16
10.8
390
36
For SEL3 < (V
CC
/2)
–
0.4V, the suggested divider
resistance of RA and RB for the corresponding
number of battery cells are as below:
BATTERY
CELLS
RA/RB
RA(K
)
RB (K
)
2
1
240
240
3
2
240
120
4
3
240
80
5
4
300
75
6
5
300
60
8
7
360
51
10
9
360
40
12
11
390
36
16
15
410
27
Battery Temperature Measurement
The AIC1781 employs a negative temperature
coefficient (NTC) thermistor to measure the
battery’s temperature. The thermistor is inherently
nonlinear with respect to temperature. To reduce
the effect of nonlinearity, a resistor-divider network
in parallel with the thermistor is recommended. A
typical application circuit is shown in Fig. 4.
V
BAT
4
Rx
C7
0
μ
F
V
CC
Ry
5
VCC
GND
12
T
VTS
AIC1781
Fig. 4 Battery Temperature Sense Circuit with
a Negative Temperature Coefficient
(NTC) Thermistor
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