SM6780AS View Datasheet(PDF) - Nippon Precision Circuits

Part Name

Description

Manufacturer

SM6780AS

Ni-Cd/Ni-MH Battery Charger IC

Nippon Precision Circuits  

Charging Flow Diagram

SM6780AS

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

OK

Not OK

Maximum quick charge time count start

Initial timer (5 minutes) count start

− ∆V detection disabled

∆T/∆t detection enabled

Battery check OK

Maximum battery voltage: VBATT ≥ 2V

and

battery temperature:

0.25VDD ≤ VTEMP ≤ 0.4VDD

Quick charge mode

LEDN = LOW (ON)

CHGN = High impedance

− ∆V detection

or

∆T/∆t detection

or

maximum charge time passed

Battery check not OK

Maximum supplemental charge time count start

Battery out-of-range

Pulse trickle mode charging

LEDN = pulse (flashing)

CHGN = pulse

Maximum charging time passed

Supplemental mode

LEDN = High impedance (OFF)

CHGN = pulse

Battery check not OK

or

maximum charging time passed

Charging terminates

Pulse trickle mode charging

LEDN = High impedance (OFF)

CHGN = pulse

NIPPON PRECISION CIRCUITS—9

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