AM336 datasheet, PDF - EEWORLD Datasheet

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AM336: DescriptionIC FOR OPTO DETECTOR; File Size273KB，12 Pages; ManufacturerAnalogMicroElectronics,Inc.(AME); AMT was founded in Taiwan in November 2000 and merged into AMT Microelectronics, Inc., a US company located in Silicon Valley, California, USA. Its stock was officially listed for public trading in March 2004.

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AM336 Overview

IC FOR OPTO DETECTOR

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IC FOR OPTO DETECTOR

FEATURES

•

2 Operation Modes (Proximity and

Barrier)

•

External Synchronisation in the

Barrier Mode

•

Ambient Light Rejection

•

Adjustable Threshold and Hysteresis

•

Normally Open and Normally Closed

Outputs

•

Driver for PNP Output Transistors

with Short Circuit Protection

•

LED Output 8 mA (Source and Sink)

•

Adjustable Detection Distance and

Hysteresis

•

Dirt Indication in the Barrier Mode

•

Internal Zener Diode for Voltage

Stabilisation (optional)

•

Maximum Supply Voltage only

Depending on External Elements

AM 336

GENERAL DESCRIPTION

The AM 336 is a bipolar monolithic integrated

circuit designed for optical detection applica-

tions.

By adding an external photodiode, an IR LED,

two PNP power transistors and a minimum of

other parts, the AM 336 will be a complete

optoelectronic interface (proximity and

barrier) for a reflective optical proximity

switch or for a light barrier with external

synchronisation.

APPLICATIONS

•

Miniaturised One Way Light Barrier

•

Miniaturised Reflection Light Barrier

•

Frame Light Barrier

BLOCK DIAGRAM

IRD

P/B

oscillator

:128

VCC

zener diode

CSC

short circuit

pulse regulation

current regulation

LED

IND

OUTA

ALR

INA

GND

SYNC

amplifier

signal

detection

output

driver

LED

LED driver

Figure 1:

Block diagram of AM336

analog microelectronics

Analog Microelectronics GmbH

An der Fahrt 13, D – 55124 Mainz

Internet: www.analogmicro.de

Phone:

Fax:

Email:

+49 (0)6131/91 073 – 0

+49 (0)6131/91 073 – 30

info@analogmicro.de

February 2005

1/12

Rev. 1.1

IC FOR OPTO DETECTOR

AM 336

Signal detection stage:

Triggered window comparator, trigger at the end of emitting–pulse, "one pulse system" (no signal

filtering).

Output stages:

Two antivalent outputs for external PNP Darlington transistors, short circuit protection with

external resistor, periodically shutdown with a duty cycle of 1%.

LED driver:

Push–pull output, indicates state of the output stages.

Z–diode:

For supply voltage stabilisation with an external transistor, so the maximum system operating

voltage depends only on external elements (wide voltage range possible).

Signal emission:

Emission pulses for applications with internal synchronisation are generated by the oscillator.

Signal detection:

Photodiode current at pin INA is converted by the amplifier. Amplifier output (pin OUTA) is

connected via a capacitor (CIN) to the signal detection input (pin IND). The signal is applied to the

comparators A and B. At the end of the emitting pulse the output state of the comparators is taken

over to the flip–flop A and B. Flip–flop A controls the output stages QO and QC.

External synchronisation:

A valid recepted light pulse synchronises the at low frequency running oscillator, pulse length and

period have to be appropriate.

OSCILLATOR:

The frequency f

of the on-chip oscillator is set by external resistor R

and capacitor C

(pin FO).

is charged via R

and discharged via R

>> R

) controlled by internal thresholds. The

oscillator frequency varies with the two operating modes by switching oscillator thresholds.

IRD drives an IR–LED via an external PNP transistor. If no external transistor is used, a pull–up

resistor has to be connected.

Proximity mode (P/B = low):

When the ramp at pin FO reaches the upper threshold of comparator C, an emission pulse at pin

IRD and the discharging of capacitor C

is triggered. This negative pulse is dermined by the

discharging time of capacitor C

. Comparator D is not affected (output stays at high level) because

its thresholds are closer to the limits of the operating voltage than the thresholds of comparator C.

Barrier mode (P/B = high):

By setting the Pin A/B = high, the comparator C is disabled and the oscillator runs by means of

comparator D at a lower frequency. If there is no light pulse or it is too low, the capacitor C

discharged when the upper threshold of comparator D is reached. A valid recepted light pulse starts

the discharge of C

earlier thus synchronising the oscillator. The synchronisation frequency has as

an upper (proximity–frequency: f

) and a lower (barrier–frequency: 1.2

) limit. If the

analog microelectronics

February 2005

5/12

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