ELM ELM303SM, ELM303P Datasheet

ELM303

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Camcorder Time–Lapse Control

Description

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Features

The ELM303 is a specialized circuit for creating
time-lapse videos on suitably equipped camcorders.
The camcorder to be controlled must have a Control
L (LANC) port, and also be capable of responding to
power control signals. This is usually only available
with the mini DIN connectors, and not the 2.5mm
stereo plug interfaces.

The ELM303 provides intervals of 10 minutes to
24 hours between recordings, without requiring any
external timing components. Recording durations of
either 1 second or 10 seconds is also selectable.

One additional feature allows manually triggered
recordings to be initiated when all three interval
inputs are at a low level. Recording will begin
immediately and will continue as long as the inputs
remain low. This combination is fully debounced,
simplifying the interface to mechanical switches.

The ELM303 has been ‘hard–coded’ to send the
Control L hex command ‘33’ (word 1) to device ‘18’
(word 0), and cannot be modified. Be sure to verify
that these are appropriate for your camera before
committing to any designs.

Applications

• Delays of 10 minutes to 24 hours with no external
timing components

• Recording durations of 1 or 10 seconds

• Low power CMOS design - typically 1mA at 5V

• Security feature allows on demand recording

• Initial recording after 1 minute to verify system
operation and connections

• Pulsed power output to control camera power

Connection Diagram

PDIP and SOIC

(top view)

VDD VSS

I2
I1

LANC
Power
D0I0

• Time-lapse video recording

• Security monitoring

• Long period time delay circuits

Block Diagram

Programmable

Delay

I2

VDD

I1

I0

ELM303DSA

VDD

Control L

Driver

D0

Control

200ms Pulse

Generator

VSS

VDD

VSS

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LANC

Power

I2 I1 I0 Interval

L L L continuous
L L H 10 min
L H L 30 min

L H H 60 min
H L L 3 hrs
H L H 6 hrs
H H L 12 hrs
H H H 24 hrs

Table 1

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ELM303

Pin Descriptions

Stresses beyond those listed here will likely damage
the device. These values are given as a design
guideline only. The ability to operate to these levels
is neither inferred nor recommended.

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.

I2 (pin 2), I1 (pin 3) and I0 (pin 4)

The time interval between each recording is

determined by the logic levels at these pins, as
shown in Table 1. The I0 input on pin 4 has a
high value pullup resistor to simplify wiring in
some instances (see the Example Applications).

level results in a nominal time of 10 seconds,

and a low level provides 1 second.

Power (pin 6)

This is an open drain output that is driven low at
the beginning and end of each recording cycle in
order to toggle the camcorder power on and off.
This output is generally connected to pin 3 of the
mini DIN Control L connector. An internal pullup
resistor is provided for a nominal drain load.

LANC (pin 7)

This is the open drain Control L (LANC) interface
pin. An internal pullup resistor is provided for a
nominal drain load.

D0 (pin 5)

This input is used to select the recording duration

(time between start and stop commands). A high

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............................... ELM303P 200 mil SOIC.....................................ELM303SM

Absolute Maximum Ratings

Storage Temperature.......................-65°C to +150°C

Ambient Temperature with

Power Applied....................................-40°C to +85°C

Voltage on VDD with respect to VSS............0 to +7.5V

Voltage on any other pin with

respect to VSS........................... -0.6V to (VDD + 0.6V)

Note:

All rights reserved. Copyright ©1999 Elm Electronics.
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 with respect to the accuracy and/or use of any products or information
described in this document. Elm Electronics 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 product in life support devices and/or
systems. Elm Electronics reserves the right to make changes to the device(s) described in this document in order to improve
reliability, function, or design.

ELM303DSA

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