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ELM303 Datasheet Preview

ELM303 Datasheet

Camcorder Time-Lapse Control

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ELM303
Camcorder Time–Lapse Control
Description
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.
www.DataSheet4UO.cnoemadditional 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
• Time-lapse video recording
• Security monitoring
• Long period time delay circuits
Block Diagram
D0 5
Control L
Driver
Programmable
Delay
Control
I2 2
I1 3
I0 4
VDD
200ms Pulse
Generator
Features
• 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 1
I2 2
I1 3
I0 4
8 VSS
7 LANC
6 Power
5 D0
VDD
7 LANC
VSS
VDD
6 Power
VSS
I2 I1 I0 Interval
L L L continuous
L L H 10 min
L H L 30 min
L H H 60 min
HL L
3 hrs
HLH
6 hrs
H H L 12 hrs
H H H 24 hrs
Table 1
ELM303DSA
Elm Electronics – Circuits for the Hobbyist
< http://www.elmelectronics.com/ >
1 of 5




ELM Electronics

ELM303 Datasheet Preview

ELM303 Datasheet

Camcorder Time-Lapse Control

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ELM303
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.
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
www.DataSheet4shUo.wconmin Table 1. The I0 input on pin 4 has a
high value pullup resistor to simplify wiring in
some instances (see the Example Applications).
D0 (pin 5)
This input is used to select the recording duration
(time between start and stop commands). A high
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.
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:
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.
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
Elm Electronics – Circuits for the Hobbyist
< http://www.elmelectronics.com/ >
2 of 5


Part Number ELM303
Description Camcorder Time-Lapse Control
Maker ELM Electronics
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ELM303 Datasheet PDF






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