Datasheet

28
LTC1096/LTC1096L
LTC1098/LTC1098L
 LINEAR TECHNOLOGY CORPORATION 1994
10968fb LT/TP 0397 5K REV B • PRINTED IN USA
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
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[phone]
FAX: [phone]
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TELEX: 499-3977
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www.linear-tech.com
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A/D Conversion for 3V Systems
The LTC1096/LTC1098 are ideal for 3V systems. Figure 17
shows a 3V to 6V battery current monitor that draws only
70µA from the battery it monitors. The battery current is
sensed with the 0.02Ω resistor and amplified by the
LT1178. The LTC1096 digitizes the amplifier output and
sends it to the microprocessor in serial format. The
LT1004 provides the full-scale reference for the ADC. The
other half of the LTC1178 is used to provide low battery
detection. The circuit’s 70µA supply current is dominated
by the op amps and the reference. The circuit can be
located near the battery and data transmitted serially to
the microprocessor.
Figure 17. This 0A to 2A Battery Current Monitor Draws Only 70µA from a 3V Battery
–
+
750k
0.1µF
0.02Ω FOR 2A FULL SCALE
0.2Ω FOR 0.2A FULL SCALE
24.9k
L
O
A
D
1/2 LT1178
LTC1096
CS


GND
V
CC

CLK
D
OUT

V
REF


LT1004-1.2
73.2k 470k
20M
470k
LO BATTERY
0.1µF
+
–
3V TO 6V
TO µP
–
+
1/2 LT1178
LTC1096/8 • F17