Fairchild AC/DC to Logic Interface Optocoupler HCPL-3700 - Manual

tm
HCPL-3700 A
C/DC to Logic Interface Optocoupler
April 2007
©2005 Fairchild Semiconductor Corporation www.fairchildsemi.com
HCPL-3700 Rev. 1.0.1
HCPL-3700
AC/DC to Logic Interface Optocoupler
Features
■ AC or DC input
■ Programmable sense voltage
■ Logic level compatibility
■ Threshold guaranteed over temperature (0°C to 70°C)
■ Optoplanar™ construction for high common mode
immunity
■ UL recognized (file # E90700)
■ VDE certified – ordering option ‘V’, e.g., HCPL3700V
Applications
■ Low voltage detection
■ 5 V to 240 V AC/DC voltage sensing
■ Relay contact monitor
■ Current sensing
■ Microprocessor Interface
■ Industrial controls
Description
The HCPL-3700 voltage/current threshold detection
optocoupler consists of an AlGaAs LED connected to a
threshold sensing input buffer IC which are optically cou-
pled to a high gain darlington output. The input buffer
chip is capable of controlling threshold levels over a wide
range of input voltages with a single resistor. The output
is TTL and CMOS compatible.
Schematic Package
8
8
1
8
1
1
TRUTH TABLE
(Positive Logic)
A 0.1 µF bypass capacitor must
be connected between pins 8
and 5.
Input Output
H L
L H
1
2
3
4 5
8
6
7
AC
DC+
DC-
AC GND
V
NC
V
O
CC
AC/DC
POWER
LOGIC
R X
HCPL-3700
GND 1 GND 2