SM6780AS View Datasheet(PDF) - Nippon Precision Circuits

Part Name

Description

Manufacturer

SM6780AS

Ni-Cd/Ni-MH Battery Charger IC

Nippon Precision Circuits  

BLOCK DIAGRAM

SM6780AS

DC

Input

Current

Source

BATT

Battery

Pack

NTC

TEMP

VDD

TIME

Reference

Regulators

Maximum

Cell-voltage Check

Input Select

Temp Check

OSC

Timer Mode

Selector

−∆V

Function

Block

A/D

∆V/∆t

Function

Block

Timing Control

Logic

Charge Control

Logic

CHG Driver

LED Driver

VSS

VDD

CHGN

VDD

LEDN

VDD

INH

PIN DESCRIPTION

Number

1

2

3

4

5

6

7

8

Name

TIME

LEDN

BATT

VSS

TEMP

VDD

INH

CHGN

Description

Charge time select 3-level input.

HIGH: 240 minutes, MID (VDD/2): 120 minutes, LOW: 80 minutes

Charge indicator LED driver output.

Open-drain output. LOW-level output in quick charge mode. 1Hz pulse output when abnormal battery voltage or

temperature is detected during quick charge mode. High impedance output in supplemental and trickle charge

modes.

Battery voltage detector input.

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

Ground

Battery temperature thermistor sensor voltage input

Supply

Charge inhibit input.

Charging is stopped when HIGH. Charging resumes with the same charge parameters in force prior to the stop

when INH goes LOW again.

Charger control output.

Open-drain output. Battery charging current flows when CHGN is high impedance. Charge current stops when

LOW. High-impedance output in quick charge mode, and pulse output in supplemental and trickle charge

modes.

NIPPON PRECISION CIRCUITS—2

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