LM3815M-1.0 National Semiconductor, LM3815M-1.0 Datasheet

LM3815M-1.0

Manufacturer Part Number

LM3815M-1.0

Description

Manufacturer

National Semiconductor

Datasheets

1.LM3815M-1.0.pdf (14 pages)

2.LM3815M-1.0.pdf (14 pages)

3.LM3815M-1.0.pdf (14 pages)

Specifications of LM3815M-1.0

Case

SOP-8

Date_code

2000+

Current page: 1 of 14
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LM3814/LM3815

Fast Current Gauge IC with Ultra Low Loss Sense

Element and PWM Output

General Description

The LM3814/LM3815 Current Gauges provide easy to use

precision current measurement with virtually zero insertion

loss (typically 0.004 ). The LM3814 is used for high-side

sensing and the LM3815 is used for low-side sensing.

A Delta Sigma analog to digital converter is incorporated to

precisely measure the current and to provide a current aver-

aging function. Current is averaged over 6 msec time peri-

ods in order to provide immunity to current spikes. The ICs

have a pulse-width modulated (PWM) output which indicates

the current magnitude and direction. The shutdown pin can

be used to inhibit false triggering during start-up, or to enter

a low quiescent current mode.

The LM3814 and LM3815 are factory-set in two different cur-

rent options. The sense range is −1A to +1A or −7A to +7A.

The user specifies a particular part number to match the cur-

rent range for a given application. The sampling interval for

these parts is 6ms. If larger sampling interval is desired for

better accuracy, please refer to the data sheets for the part

numbers LM3812 and LM3813.

Connection Diagrams

for High-Side Sensing

Top View

LM3814

DS101013-1

DS101013

Key Specifications

n Ultra low insertion loss (typically 0.004 )

n 2V to 5.25V supply range

n Low quiescent current in shutdown mode (typically 2.5

n 6 msec sampling interval

Features

n No external sense element required

n PWM output indicates the current magnitude and

n PWM output can be interfaced with microprocessors

n Precision

n Low temperature sensitivity

n Internal filtering rejects false trips

n Internal Power-On-Reset (POR)

Applications

n Battery charge/discharge gauge

n Motion control diagnostics

n Power supply load monitoring and management

n Resettable smart fuse

accuracy of the internal sense element) (LM3814-1.0,

LM3815-1.0)

µA)

direction

3.5% accuracy at room temperature (includes

current-sense technique

for Low-Side Sensing

Top View

LM3815

DS101013-3

January 1999

www.national.com

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