LTC1197CS8 datasheet(26/28 Pages) LINER

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LTC1197/LTC1197L

LTC1199/LTC1199L

Battery Current Monitor

The LTC1197L/LTC1199L are ideal for 3V systems. Fig-

ure 14 shows a 2.7V to 4V battery current monitor that

draws only 45

µA at 3V from the battery it monitors,

sampling at a 1Hz rate. To minimize supply current, the

microprocessor uses the LTC1152 SHDN pin to turn on

the op amp prior to making a measurement and then turn

it off after the measurement has been made. The battery

current is sensed with the 0.005

Ω resistor and amplified

APPLICATI

TYPICAL

by the LTC1152. The LTC1197L digitizes the amplifier

output and sends it to the microprocessor in serial

format. After each sample the LTC1197L automatically

powers down. The LT1004 provides the full-scale refer-

ence for the ADC. The circuit’s 45

µA supply current is

dominated by the reference and the op amp. The circuit

can be located near the battery and data transmitted

serially to the microprocessor.

LTC1152

SHDN

240k

56k

µP

100

Ω

0.005

Ω

2A FULL

SCALE

500pF

2.7V

TO 4V

µF

0.1

µF

LT1004-1.2

+IN

– IN

GND

VCC

CLK

DOUT

VREF

LTC1197L

Figure 14. This 0A to 2A Battery Current Monitor Draws Only 45

µA from a 3V Battery

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