SM6780AS View Datasheet(PDF) - Nippon Precision Circuits
Part Name
Description
Manufacturer
SM6780AS Datasheet PDF : 11 Pages
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SM6780AS
Charging Modes
The SM6780AS has 3 modes of operation: quick
charge, supplemental charge, and pulse trickle mode.
The SM6780AS uses the various detection functions
to monitor the state of the battery and select the
charging mode automatically.
In quick charge mode, charging occurs at a rate set
by the external current source. In supplemental
charge mode, the battery is charged by current pulses
to the full stable capacity of the chemical substances
within the battery. Pulse trickle mode maintains the
level within the battery, compensating for internal
losses.
Hi-Z
Low
Quick charge mode
Supplemental
charge mode
Pulse trickle
mode
Start
Quick charge
mode end
Charge
complete
Figure 5. Charging mode, battery voltage and charging current
Quick (Supplemental) Charge Conditions — Battery Check
The SM6780AS monitors the battery voltage and
battery temperature to confirm the values are within
the rated range of the battery during quick charge
and supplemental charging modes to realize a high-
stability battery charger.
If the battery voltage or battery temperature charging
rating is exceeded before quick charging mode ter-
minates, the charging mode is placed on hold. The
internal timer continues to operate, and pulse trickle
charging occurs. The LEDN output pulses at a rate of
approximately 1Hz. If the charging rating is
exceeded during supplemental charging mode, the
mode terminates and charging switches to pulse
trickle mode.
VBATT
VTEMP
Maximum cell
Voltage
2.0V
Low temperature sense
Voltage (0.4 × VDD)
Charge
valid range
High temperature sense
Voltage (0.25 × VDD)
Maximum temperature
Voltage (0.225 × VDD)
0V
Charge
valid range
Pulse trickle
mode
Quick charge
mode
Pulse trickle
mode
Quick charge
mode
Power ON Quick charge
start
Quick charge
is suspended
Quick charge
restart
High-temperature quick charge hold state: VTEMP < VMXT (0.225 × VDD)
High-temperature quick charge hold release state: VTEMP > VHTS (0.25 × VDD)
Figure 6. Quick (supplemental) charge ranges
NIPPON PRECISION CIRCUITS—6
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