SM6781BV View Datasheet(PDF) - Nippon Precision Circuits

Part Name

Description

Manufacturer

SM6781BV

Ni-MH/Ni-Cd Battery Charger IC

Nippon Precision Circuits  

BLOCK DIAGRAM

SM6781BV

DC

Input

Current

Source

Battery

Pack

BATT

INH

VDD

Reference

Regulators

Max/Min

Cell-voltage

Check

OSC

VDD

TIME

Timer Mode

Selector

−∆V

A/D Function

Block

Timing Control

Logic

Charge Control

Logic

CHG Driver

LED Driver

VSS

CHGN

VDD

LEDN

NC

PIN DESCRIPTION

Number

1

Name

TIME

2

LEDN

3

BATT

4

VSS

5

VDD

6

NC

7

INH

8

CHGN

I/O

Description

Timer mode select input (3-level)

I

HIGH and LOW levels applied using pull-up and pull-down, respectively. MID-level is applied using a

voltage divider resistor network with voltage VDD/2.

Charge status display LED driver output (open-drain output)

O

LOW-level output in quick charge mode. 1Hz pulse output when abnormal battery voltage is detected

during quick charge. High impedance when charging finishes.

I

Battery voltage detector input.

Connect a high-impedance resistor voltage divider between the poles of the battery for voltage detection.

–

Ground

–

Supply

–

No connection (must be open)

Inhibit input

I

Charging operation is stopped when HIGH. Charging recommences with the same charging parameters

when INH goes LOW again.

O

Charge control (open-drain output)

High impedance output when charging current is flowing. LOW-level output when charging current stops.

NIPPON PRECISION CIRCUITS—2

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