Datasheet > ELM380

ELM380

更新时间： 2024-11-22 06:56:35

品牌	Logo	应用领域
ELM		电池
页数	文件大小	规格书
4页	32K
描述
BATTERY CHARGER TIMER

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ELM380 数据手册

ELM380

Battery Charger Timer

Description

Features

The ELM380 is an 8 pin integrated circuit that is

• Low power CMOS design - typically 1mA at 5V

• Wide supply range - 3.0 to 5.5 volt operation

• Quick settings of 8 or 14 hours

used to provide very long time interval outputs. It is

typically used for enabling the charge circuit in

Nickel Cadmium battery chargers, but can be easily

adapted for many other applications.

• Complementary outputs simplify designs

• External reset input for system use

An express ‘one button’ mode is provided on

chip specifically for rechargeable battery circuits. In

this mode, pressing the start button once initiates a

user selectable 8 or 14 hour timing interval, after

which the circuit shuts off. If one prefers, pressing

that same button multiple times will allow for user

programmable intervals of from 2 to 77 hours.

• Internal pullup resistors for switch inputs

• High current drive outputs - up to 25 mA

• Line frequency input for accurate timing

The circuit requires a 60Hz full-wave rectified

signal for its operation. This 120Hz time base is

used for all of the timekeeping functions, providing

good long term stability and low cost.

Connection Diagram

PDIP and SOIC

(top view)

Interfacing to the ELM380 is simplified by the

provision of internal pull-up resistors so that the

mechanical switches can be directly connected

without additional components, or simply not used,

depending on the application.

VDD

Out

VSS

start

Out

8/14 hrs

Clock

reset

Applications

• Ni-Cd battery chargers

• Yard lighting or watering controls

• Houseplant grow lamp controllers

Block Diagram

VDD

Debounce

Timers

Out

start

Control

and

Counters

VDD

8/14 hrs

VDD

Clock

reset

ELM380DSB

Elm Electronics – Circuits for the Hobbyist

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