HCPL-7860#300 Avago Technologies US Inc., HCPL-7860#300 Datasheet - Page 12

• Manufacturer Part Number: HCPL-7860#300
• Manufacturer: Avago Technologies US Inc.

Specifications of HCPL-7860#300

• Operating Supply Voltage (typ): 5V
• Lead Free Status / RoHS Status: Not Compliant

Figure 13. Signal Delay vs. Conversion Mode.
Figure 16. Typical Application Circuit.
12
Application Information
Digital Current Sensing
As shown in Figure 16, using the Isolated 2-chip A/D con-
verter 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 conver-
sion time to less than 1 Ps, 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 measure-
ments, and an adjustable threshold detector for detecting
non-short circuit overload conditions.
CURRENT
INPUT
100
90
80
70
60
50
40
30
20
10
0
1
R
SHUNT
0.02
+
2
CONVERSION MODE #
0.1 μF
C1
ISOLATED
3
+ 5 V
4
V
V
V
GND1
DD1
IN+
IN-
HCPL-7860/
HCPL-786J
5
MCLK
MDAT
GND2
V
DD2
NON-ISOLATED
+ 5 V
Figure 14. Over-Range and Threshold Detect Times.
Figure 15. Signal Bandwidth vs. Conversion Mode.
0.1 μF
100
90
80
70
60
50
40
30
20
10
0
C2
1
V IN+ (200 mV/DIV.)
CCLK
CLAT
CDAT
MCLK1
MDAT1
MCLK2
MDAT2
GND
2
HCPL-0872
OVR1 (200 mV/DIV.)
CONVERSION MODE #
2 μs/DIV.
RESET
CHAN
SCLK
SDAT
OVR1
3
THR1
V
CS
DD
THR1
(2 V/DIV.)
4
+
10 μF
C3
3-WIRE
SERIAL
INTERFACE
5