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HCPL-7560

Optically Isolated Sigma-Delta (Σ-∆) Modulator

Avago Technologies 

Applications Information

Digital Current Sensing

As shown in Figure 16, using the Isolated 2-chip A/D

converter to sense current can be as simple as connect-

ing a current-sensing resistor, or shunt, to the input and

reading output data through the 3-wire serial output

interface. By choosing the appropriate shunt resistance,

any range of current can be monitored, from less than 1

A to more than 100 A.

Even better performance can be achieved by fully utiliz-

ing the more advanced features of the Isolated A/D con-

verter, such as the pre-trigger circuit, which can reduce

conversion time to less than 1ms, the fast over-range

detector for quickly detecting short circuits, different

conversion modes giving various resolution/speed

trade-offs, offset calibration mode to eliminate initial

offset from measurements, and an adjustable threshold

detector for detecting non-short circuit overload condi-

tions.

NON-ISOLATED

+5V

INPUT

CURRENT

+

R SHUNT

0.02

ISOLATED

+5V

C1

0.1 µF

V DD1

V IN+

V IN-

GND1

V DD2

MCLK

MDAT

GND2

HCPL-7560

Figure 16. Typical Application Circuit.

C2

0.1 µF

CCLK

CLAT

CDAT

MCLK1

MDAT1

MCLK2

MDAT2

GND

V DD

CHAN

SCLK

SDAT

CS

THR1

OVR1

RESET

HCPL-0872

+

C3

10 µF

3-WIRE

SERIAL

INTERFACE

12

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