SAA1501T データシートの表示（PDF） - Philips Electronics

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SAA1501T

Battery charge level indicator

Philips Electronics 

Philips Semiconductors

Battery charge level indicator

Objective specification

SAA1501T

FEATURES

• High level of integration to allow assembly in intelligent

battery packs

• Accurate charge and discharge account

• Large dynamic range of charge and discharge currents

• Independent settings of charge and discharge efficiency

• 2 V minimum supply voltage (2 cell operation)

• Temperature protection of batteries during charging

• Temperature controlled self-discharge

• Accurate charge current regulation

• Two charge amount display modes, LCD and LED.

GENERAL DESCRIPTION

The SAA1501T is intended to be used as a battery monitor

and charge current control circuit in rechargeable battery

systems.

The SAA1501T is processed in BiCMOS technology

where the benefits of mixed bipolar and CMOS technology

is fully utilized to achieve high accuracy measurements

and digital signal processing in the same device. The

general function of the integrated circuit is a Coulomb

counter. During battery charging, the charge current and

charge time are registered in a Coulomb counter. During

discharge, the discharge current and time are recorded.

The momentary charge amount of the batteries can be

displayed either on an LCD screen or on an LED bargraph.

Using the SAA1501T, intelligent batteries or intelligent

battery powered systems can be easily designed with only

a few external components.

QUICK REFERENCE DATA

SYMBOL

VCC

ICC

ICCstb

fosc

Vi(s)

Tamb

PARAMETER

CONDITIONS

supply voltage

supply current

VCC = 3 V;

Ic = Id = 60 µA

supply current in standby mode

VCC = 3 V;

VCSI = VDSI = 0 V

fixed oscillator frequency

Cosc = 820 pF;

Rref = 51.5 kΩ

input sense voltage (pins 9 and 10)

operating ambient temperature

MIN.

2.0

−

TYP.

3.0

1.2

MAX.

4.3

1.7

UNIT

V

mA

−

−

100

µA

−

4.2

−

kHz

0

−

0

−

VCC − 1.6 V

+70

°C

ORDERING INFORMATION

TYPE NUMBER

SAA1501T

NAME

SO24

PACKAGE

DESCRIPTION

plastic small outline package; 24 leads; body width 7.5 mm

VERSION

SOT137-1

December 1994

2

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