Datasheet

AD8212
Rev. B | Page 12 of 16
BIDIRECTIONAL CURRENT SENSING
The AD8212 is a unidirectional current sensing device.
Therefore, in power management applications where both the
charge and load currents must be monitored, two devices can
be used and connected as shown in Figure 27. In this case,
V
OUT
1 increases as I
LOAD
flows through the shunt resistor. V
OUT
2
increases when I
CHARGE
flows through the input shunt resistor.
V
OUT
1
I
LOAD
R
OUT
1
I
OUT
COM BIAS ALPHA I
OUT
V
SENSE
V
SENSE
V+V+
COMBIASALPHA
AD8212
R
SHUNT
OUTPUT
CURRENT
COMPENSATION
LOAD
I
CHARGE
V
OUT
2
R
OUT
2
AD8212
OUTPUT
CURRENT
COMPENSATION
0
5942-011
CHARGE
BATTERY
BIAS
CIRCUIT
BIAS
CIRCUIT
8 8
6325
6 3 2
5
1 1
Figure 27. Bidirectional Current Sensing