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LTC1197CS8 Datasheet(PDF) 26 Page - Linear Technology

Part # LTC1197CS8
Description  10-Bit, 500ksps ADCs in MSOP with Auto Shutdown
PDF  28 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1197CS8 Datasheet(HTML) 26 Page - Linear Technology

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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
S
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
TO
µP
100
Ω
2k
0.005
Ω
2A FULL
SCALE
500pF
2.7V
TO 4V
1
µF
1
µF
0.1
µF
LT1004-1.2
1
2
3
4
8
7
6
5
CS
+IN
– IN
GND
VCC
CLK
DOUT
VREF
LTC1197L
L
O
A
D
+
Figure 14. This 0A to 2A Battery Current Monitor Draws Only 45
µA from a 3V Battery



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