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ELM624

Control L (LANC) to RS232 Interpreter

Elm Electronics 

ELM624

Control L and LANC

The terms Control L and LANC mean the same thing, and are used interchangeably throughout the following.

Pin Descriptions

VDD (pin 1)

This pin is the positive supply pin, and should always

be the most positive point in the circuit. Internal

circuitry connected to this pin is used to provide

power on reset of the microprocessor, so an external

reset signal is not required. Refer to the Electrical

Characteristics section for further information.

XT1 (pin 2) and XT2 (pin 3)

A 3.579545MHz NTSC television colourburst crystal

is connected between these two pins. Crystal

loading capacitors (typically 27pF) will also normally

be connected between each of the pins and Vss.

Note that this frequency is used for both 50Hz and

60Hz systems. The ELM624 automatically adjusts to

the system that you are using.

Enable (pin 4)

This is an active high input that controls RS232 data

flow to and from the ELM624. If at a high level, the

RS232 data communications are enabled, while a

low input disables them. When disabled, all RS232

data sent to the IC is ignored, and no RS232 output

is generated by the ELM624. See the Example

Applications section for more on this.

Rx (pin5)

The computer’s RS232 transmit signal is directly

connected to this pin through a single current limiting

resistor (typically about 47KΩ). Internal signal

inversion and Schmitt trigger waveshaping provide

the necessary signal conditioning.

Tx (pin 6)

This is the RS232 data output pin. The signal

polarity is compatible with most interface ICs, and

the drive is sufficient to allow interfacing using only a

single PNP transistor if desired. See the Example

Applications section for more details.

When selected for Trigger Pulse outputs, this pin

provides the active low output pulses.

LANC (pin 7)

This is the open drain Control L (LANC) interface

pin. An internal pullup resistor is provided for a

nominal drain load.

VSS (pin 8)

Circuit common is connected to this pin. This is the

most negative point in the circuit.

Ordering Information

These integrated circuits are available in either the 300 mil plastic DIP format, or in the 200 mil SOIC surface

mount type of package. To order, add the appropriate suffix to the part number:

300 mil Plastic DIP............................... ELM624P

200 mil SOIC..................................... ELM624SM

Control L, LANC, and Sony are registered trademarks of the Sony Corporation.

All rights reserved. Copyright 2004 by Elm Electronics Inc.

Every effort is made to verify the accuracy of information provided in this document, but no representation or warranty can be

given and no liability assumed by Elm Electronics Inc. with respect to the accuracy and/or use of any products or information

described in this document. Elm Electronics Inc. will not be responsible for any patent infringements arising from the use of these

products or information, and does not authorize or warrant the use of any Elm Electronics Inc. product in life support devices

and/or systems. Elm Electronics Inc. reserves the right to make changes to the device(s) described in this document in order to

improve reliability, function, or design.

ELM624DSD

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