AIC1783CS datasheet(8/11 Pages) AIC

Part #	AIC1783CS

Description	Battery Charge Controller

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Manufacturer	AIC [Analog Intergrations Corporation]

Direct Link	http://www.analog.com.tw

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AIC1783

8

The functions and charging states control mentioned

above are illustrated in the function flow chart of

AIC1783 (Fig. 2)

DESIGN GUIDE

Battery Voltage Measurement

The AIC1783 measures the battery voltage through

VBT pin, which is connected to battery positive

terminal through a resistor-divider net work, as

shown in Fig. 1

VBAT

RA

RB

C5

7

R5

100K

C6

AIC1783

VBT

+

FIG. 1

Battery Voltage Divider

The suggested divider resistance of RA and RB

for the corresponding number of battery cells are

as below:

BATTERY

CELLS

RA/RB

RA (K

Ω)

RB (K

Ω)

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

Setting the Period of Safety Timer

The

AIC1783

provides

a

method

for

linearly

adjusting the period of safety timer with an external

resistor connected from TIMER pin to GND. The

relation

between

safety

timer

length

and

the

external resistor (RTIMER) is shown in Fig. 3. The

table following shows the resistor values for some of

the commonly chosen safety timer periods. Also

shown in the table are their corresponding oscillator

frequencies.

0

100

200

300

400

500

0

200

400

600

800

Safety Timer (min.)

Fig. 3

Safety Timer vs. RTIMER

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AIC1783CS Datasheet(PDF) 8 Page - Analog Intergrations Corporation

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