SM6780AS 查看數據表（PDF） - Nippon Precision Circuits
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SM6780AS Datasheet PDF : 11 Pages
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SM6780AS
FUNCTIONAL DESCRIPTION
Charger Operation
The SM6780AS battery charger operation starts
when the power is applied or when standby mode is
released. The charging operation is determined by
the BATT and TEMP pin states, and the timer mode
selected.
After charging starts, the battery voltage and temper-
ature are monitored to check that they are within
quick charging rated ranges. If within rated range,
quick charge mode is selected. If outside rated range,
pulse trickle charge mode is selected.
Charging Rate
The charging rate is determined by the external
charger current source. If the quick charge mode
charging rate is considered as unity, then the supple-
mental charging rate is 1/16, and the pulse trickle
charging rate is 1/256. The charging rate for supple-
Quick charge uses either negative delta voltage
detection (−∆V), temperature detection (∆T/∆t), or
charging time cutoff to terminate the charging pro-
cess. The charging mode changes to supplemental
charge mode when quick charge mode is completed.
Supplemental mode terminates when the charging
time finishes or battery is full, and the charging mode
changes to pulse trickle mode.
mental and pulse trickle modes are shown in figure 1.
The CHGN output is high impedance when the
charging current is flowing, and LOW when the cur-
rent stops.
286µs
286µs
Hi-Z
Low
4576µs
Quick charge
mode
Supplemental
charge mode
Start
(power ON or battery insertion)
73.1ms
Pulse trickle mode
Figure 1. CHGN output (external charger control)
Charging Status Indicator LED Control (LEDN)
The SM6780AS LEDN output can be used to drive a
charging status indicator LED.
The LED timing when power is applied or standby
mode is released is shown in figure 2.
In quick charge mode, the LEDN output is LOW and
the LED turns ON. If the battery temperature or bat-
tery voltage exceeds the charging rated ranges, the
LEDN output pulses at a frequency of 1Hz to indi-
cate battery out-of-range condition. In supplemental
and pulse trickle modes, the LEDN output is high
impedance and the LED turns OFF.
Hi-Z
LED OFF
LED ON
Low
Depends on charge mode
Approximately Approximately
1.5 s
3.5 s
Power ON or Standby mode cancel
Figure 2. LEDN output timing
NIPPON PRECISION CIRCUITS—4
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