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AIC1781

Battery Charge Controller

Analog Intergrations 

AIC1781

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.

VBAT

RA

R5

2

VBT

+

100K

RB

C5

C6

AIC1781

Fig. 3

Battery Voltage Divider

For SEL3 > (VCC/2) + 0.4V, the suggested divider

resistance of RA and RB for the corresponding

number of battery cells are as below:

BATTERY

CELLS

2~4

3~6

4~8

5~10

6~12

8~16

RA/RB

2

3.3

4.9

6.4

7.8

10.8

RA (KΩ)

240

300

300

300

310

390

RB (KΩ)

120

91

62

47

39

36

For SEL3 < (VCC/2) – 0.4V, the suggested divider

resistance of RA and RB for the corresponding

number of battery cells are as below:

BATTERY

CELLS

2

3

4

5

6

8

10

12

16

RA/RB

1

2

3

4

5

7

9

11

15

RA(KΩ) RB (KΩ)

240

240

240

120

240

80

300

75

300

60

360

51

360

40

390

36

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.

VBAT

VCC

Rx

5

VCC

4 VTS

C7

AIC1781

Ry

12

GND

Fig. 4 Battery Temperature Sense Circuit with

a Negative Temperature Coefficient

(NTC) Thermistor

10

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