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SS6783ACSTR Scheda tecnica(PDF) 8 Page - Silicon Standard Corp.

Il numero della parte SS6783ACSTR
Spiegazioni elettronici  Battery Charge Controller for Low Power Charging
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Produttore elettronici  SSC [Silicon Standard Corp.]
Homepage  http://www.siliconstandard.com
Logo SSC - Silicon Standard Corp.

SS6783ACSTR Scheda tecnica(HTML) 8 Page - Silicon Standard Corp.

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SS6783A(G)
1/11/2005 Rev.2.10
The functions and charging state control mentioned
above are illustrated in the function flow-chart of
the SS6
783A (Fig. 12)
DESIGN GUIDE
Battery Voltage Measurement
The SS6783A measures the battery voltage
through VBT pin, which is connected to the battery
positive terminal through a resistor-divider network,
as shown in Fig. 11.
VBAT
RA
RB
C5
7
R5
100k
C6
SS6
783A
VBT
+
Fig. 11
Battery Voltage Divider
The suggested divider resistance of RA and RB
for the corresponding number of battery cells are
as below:
TABLE 1
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 SS6783A provides a method for linearly adjusting
the period of the 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. 13. 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. 13
Safety Timer vs. RTIMER


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