SM6781 datasheet(5/10 Pages) NPC

部件名	SM6781

功能描述	Ni-MH/Ni-Cd Battery Charger IC

Download	10 Pages

Scroll/Zoom	100%

制造商	NPC [Nippon Precision Circuits Inc]

网页	http://www.npc.co.jp/en

标志

5 / 10 page

SM6781BV

NIPPON PRECISION CIRCUITS—5

FUNCTIONAL DESCRIPTION

Charging Flowchart

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

Quick charge mode

(

−∆V detection prohibit condition)

LEDN = LOW (ON)

CHGN = High impedance

Quick charge hold

LEDN = High impedance (pulsing)

CHGN = LOW

Abnormal battery voltage

detection cleared

Maximum quick charge time count stopped

−∆V detection prohibit time count stopped

Abnormal battery voltage detection

Peak voltage data clear

Maximum quick charge time count restarted

−∆V detection prohibit time count restarted

−∆V detection prohibit time passed

Battery voltage check

(Battery voltage: VBATT

≥ 2V or 0.6V > VBATT)

CHGN = LOW

(Quick charge current stop condition)

Quick charge mode

(

−∆V detection active condition)

LEDN = LOW (ON)

CHGN = High impedance

Quick charge finished

Battery voltage check stop

LEDN = High impedance (OFF)

CHGN = LOW

− ∆V detection

or

Maximum quick charge time passed

YES

NO

YES

Abnormal battery voltage

detection cleared

(Return status in force

before abnormal battery

voltage detected)

Abnormal battery voltage detection

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