SM6780AS datasheet(9/11 Pages) NPC

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SM6780AS

NIPPON PRECISION CIRCUITS—9

Charging Flow Diagram

Supply applied

Standby mode released

LED ON

Battery check

(maximum battery voltage: VBATT

≥ 2V)

and

(battery temperature: 0.225VDD

≤ VTEMP ≤ 0.4VDD)

continuously battery check operation

Maximum quick charge time count start

Initial timer (5 minutes) count start

− ∆V detection disabled

∆T/∆t detection enabled

Quick charge mode

LEDN = LOW (ON)

CHGN = High impedance

Maximum supplemental charge time count start

Supplemental mode

LEDN = High impedance (OFF)

CHGN = pulse

Charging terminates

Pulse trickle mode charging

LEDN = High impedance (OFF)

CHGN = pulse

− ∆V detection

∆T/∆t detection

maximum charge time passed

Battery check not OK

maximum charging time passed

Battery out-of-range

Pulse trickle mode charging

LEDN = pulse (flashing)

CHGN = pulse

Battery check not OK

Battery check OK

Maximum battery voltage:

VBATT

≥ 2V

and

battery temperature:

0.25VDD

≤ VTEMP ≤ 0.4VDD

Not OK

Maximum charging time passed

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