7555CD DATASHEET PDF
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Multi-module applications might require use of the enable inputs to limit interference. When at the edge of the detection range, this output will alternate between high and low. A red LED on the emitter side of the board is tied to this output and turns on when the pin goes low, providing a visual indication of when the sensor is detecting something. To run the sensor at full brightness while powered at 3. Using the sensor Connections The proximity sensor has four connections: Limitations This sensor will dataheet tell you if an object is within its sensing range, not how far away it is.
Some optical shielding, such as 755cd having the sensor mounted receiver-side-down when fluorescent lights are above, might mitigate this. The logic power, VDD, should be between 3.
electronics 7555CD ICM7555CD SOP-8 real-time clock chip
Multiple sensors can interfere with each other. Unlike most IR receiver modules designed for remote control of appliances like televisions, the TSSP has a fixed gain sensitivity that makes the sensor more predictable when used in proximity or reflectance sensors.
The sensor is merely looking at whether or not it is getting any signal back, so object size and reflectivity to IR will affect sensing range.
The new versions have the same dimensions and pinout 7555dc the originals and are intended as drop-in replacements for any applications that can tolerate the change in component locations. This pin is high by default and can be left disconnected if dynamic control of the IR emitter is not needed. An enable input allows control of whether or not the IR LED is on, and a digital output indicates whether or not an object is detected.
CD Datasheet, PDF – Alldatasheet
The sensor should work to at least some degree over the entire range of the pot. The main changes are the locations of the emitter LED and IR detector, which have been moved away from the edge of the board. The sensing angle is relatively wide in both directions. This sensor can be triggered by ambient IR e. Products New Products Specials! Some advanced analysis of the correlation between the output and toggling of the enable input might also be used to mitigate ambient interference. This results in better shielding from the PCB itself, which improves performance.
For many applications, additional shielding can be used to block undesirable sensing paths, such as reflections off of the ground, or to reduce interference from ambient lighting. Tuning the emitter frequency The trimmer potentiometer on the receiver side of the sensor can be used to adjust frequency of the IR emitter LED. This schematic is also available as a downloadable pdf k pdf. If you have the appropriate equipment, you can tune it by setting the actual frequency, but a simpler approach is to just observe the performance as you turn the pot.
Print Email a friend Feeds. Several alternatives are available for this product. Proximity Sensors and Range Finders. Shop Blog Forum Support.
The actual performance depends on many factors, including object size, reflectivity, and ambient lighting conditions. At the edge of its detection range, the output will alternate between high and low as it sporadically detects see the left oscilloscope capture below.
ICM Datasheet(PDF) – NXP Semiconductors
Schematic diagram This schematic is also available as a downloadable pdf k pdf. Alternatives available with variations in these parameter s: The trimmer potentiometer on the receiver side of the sensor can be used to adjust frequency of the IR emitter LED. You can use several of the proximity sensors with these discrete IR receivers to make sophisticated sensing solutions in which you enable one emitter at a time and monitor the reflections with the other sensors.
Feedback Comments or questions? When applying shielding, keep in mind that reflection off the shielding itself can cause undesired activation of the sensor.
Select variant Several alternatives are available for this product. The four connections are arranged with a 0.
The proximity sensor has four connections: