HCPL-7860 datasheet(12/18 Pages) HP

12 / 18 page

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 connecting 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 utilizing

the more advanced features of

the Isolated A/D converter,

such as the pre-trigger circuit,

which can reduce conversion

time to less than 1

µs, 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 conditions.

Figure 16. Typical Application Circuit.

R SHUNT

0.02

INPUT

CURRENT

V DD1

ISOLATED

+ 5 V

V IN+

V IN-

GND1

V DD2

MCLK

MDAT

GND2

0.1 µF

CDAT

SCLK

CCLK

V DD

CLAT

CHAN

MCLK1

SDAT

MDAT1

MCLK2

THR1

MDAT2

OVR1

GND

RESET

NON-ISOLATED

+ 5 V

10 µF

HCPL-7860/

HCPL-786J

3-WIRE

SERIAL

INTERFACE

0.1 µF

HCPL-0872

HCPL-7860 데이터시트(PDF) 12 Page - Agilent(Hewlett-Packard)

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