SM6781BV データシートの表示（PDF） - Nippon Precision Circuits

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SM6781BV

Ni-MH/Ni-Cd Battery Charger IC

Nippon Precision Circuits  

FUNCTIONAL DESCRIPTION

Charging Flowchart

SM6781BV

Supply applied

Standby mode released

Initialization (approx. 200ms)

Maximum quick charge time count start

−∆V detection prohibit time count start

Battery voltage check start

(Abnormal battery voltage detection

at VBATT ≥ 2V or 0.6V > VBATT)

Continuously battery voltage check operation

Abnormal battery voltage detection

Maximum quick charge time count stopped

−∆V detection prohibit time count stopped

Quick charge mode

(−∆V detection prohibit condition)

LEDN = LOW (ON)

CHGN = High impedance

Abnormal battery voltage detection

Quick charge hold

LEDN = High impedance (pulsing)

CHGN = LOW

NO

−∆V detection prohibit time passed

Battery voltage check

(Battery voltage: VBATT ≥ 2V or 0.6V > VBATT)

CHGN = LOW

YES

Abnormal battery voltage

(Quick charge current stop condition)

detection cleared

YES

(Return status in force

before abnormal battery

NO

Quick charge mode

voltage detected)

(−∆V detection active condition)

LEDN = LOW (ON)

CHGN = High impedance

Peak voltage data clear

− ∆V detection

NO

or

Maximum quick charge time passed

YES

Quick charge finished

Battery voltage check stop

LEDN = High impedance (OFF)

CHGN = LOW

Maximum quick charge time count restarted

−∆V detection prohibit time count restarted

Abnormal battery voltage

detection cleared

NIPPON PRECISION CIRCUITS—5

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