HCPL-7860 Просмотр технического описания (PDF) - Agilent Technologies, Inc

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HCPL-7860

Optically Isolated Sigma-Delta (Σ−∆) Modulator

Agilent Technologies, Inc 

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.

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-7860/

HCPL-786J

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

3-WIRE

SERIAL

INTERFACE

+ C3

10 µF

12

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