AIC1783 AIC [Analog Intergrations Corporation], AIC1783 Datasheet - Page 8

• Manufacturer Part Number: AIC1783
• Description: Battery Charge Controller
• Manufacturer: AIC [Analog Intergrations Corporation]

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
The suggested divider resistance of RA and RB
for the corresponding number of battery cells are
as below:
V
BAT
BATTERY
CELLS
5~10
6~12
8~16
FIG. 1
2~4
3~6
4~8
RB
RA
C5
RA/RB
+
10.8
3.3
4.9
6.4
7.8
Battery Voltage Divider
2
100K
R5
RA (K )
C6
240
300
300
300
310
390
7
VBT
RB (K )
AIC1783
120
91
62
47
39
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 (R
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.
800
600
400
200
0
Fig. 3
0
Safety Timer vs. R
100
TIMER
Safety Timer (min.)
200
) is shown in Fig. 3. The
300
AIC1783
TIMER
400
500
8