Fairchild HCPL-3700 manual Features, Description, To Logic Interface Applications, Optocoupler

April 2007

HCPL-3700

tm

AC/DC to Logic Interface Optocoupler

HCPL-3700 AC/DC

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

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.

to Logic Interface

Applications

■Low voltage detection

■5 V to 240 V AC/DC voltage sensing

■Relay contact monitor

■Current sensing

■Microprocessor Interface

■Industrial controls

Schematic			Package
AC	1	8	VCC
				8
DC+	2	7	NC
				1
DC-	3	6	VO
AC	4	5	GND
			8	8
				1	1
	TRUTH TABLE
	(Positive Logic)			R X
			AC/DC
				HCPL-3700	LOGIC
Input		Output	POWER
	H	L
	L	H
A 0.1 µF bypass capacitor must			GND 1		GND 2
be connected between pins 8

and 5.

Optocoupler

©2005 Fairchild Semiconductor Corporation	www.fairchildsemi.com
HCPL-3700 Rev. 1.0.1