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SM6780AS датащи(PDF) 5 Page - Nippon Precision Circuits Inc

номер детали SM6780AS
подробное описание детали  Ni-Cd/Ni-MH Battery Charger IC
PDF  11 Pages
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производитель  NPC [Nippon Precision Circuits Inc]
домашняя страница  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc

SM6780AS датащи(HTML) 5 Page - Nippon Precision Circuits Inc

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SM6780AS
NIPPON PRECISION CIRCUITS—5
Battery Voltage and Temperature Detection
The battery voltage detector input is BATT. The
charger treats the input voltage as the equivalent
voltage of a single cell. For multiple cells (connected
in series), a high-resistance (> 100k
Ω) battery
divider can be used to input the voltage equivalent of
a single cell, as shown in figure 3.
The battery temperature detector input is TEMP. The
input voltage is provided by a negative temperature
coefficient thermistor (NTC thermistor) located in
close proximity to the battery, as shown in figure 4.
The input voltage range is 0.5V to VDD.
Note that the thermistor temperature characteristics
are non-linear, so a correction resistance Rc should
be used for linearity correction. The temperature rat-
ing of resistances Rc and Rd should be chosen to
match the battery temperature range rating. If the
temperature detection function is not used, the
TEMP input should be fixed at a potential in the
range 0.25VDD to 0.4VDD.
Figure 3. BATT connection example
BATT pin
Battery
Rb
Ra
Rb
Ra
= N
− 1
N:Number of cells
Figure 4. TEMP connection example
TEMP pin
Battery
Rd
Rc



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