Intersil introduces ISL29501 Time-of-Flight IC | Automation.com

Intersil introduces ISL29501 Time-of-Flight IC

October 132015
Intersil introduces ISL29501 Time-of-Flight IC

October 13, 2015 – Intersil introduces ISL29501 Time-of-Flight IC that detects objects up to two meters.It provides a complete object detection and distance measurement solution when combined with an external emitter (LED or laser) and photodiode. The ISL29501 ToF device ultra-small size, low-power consumption and performance ideal for connected devices.

The ISL29501 overcomes the shortcomings of traditional amplitude-based proximity sensors and other ToF solutions that perform poorly in lighting conditions above 2,000 lux, or cannot provide distance information unless the object is perpendicular to the sensor. Alternative solutions are too expensive, bulky or power hungry for use in small form factor, battery-powered applications. ISL29501 sensor provides a small solution footprint and precision long-range accuracy up to two meters in both dark and bright ambient light conditions. ISL29501 allows customers to select the emitter and photodiode of their choice and configure a low power ToF sensing system customized for their application. To make system design easy for customers, Intersil offers a reference design featuring the ISL29501, emitter and photodiode, along with graphical user interface (GUI) software and user’s guide.

The on-chip emitter DAC with programmable current up to 255mA allows system designers to select the desired current level for driving the external infrared (IR) LED or laser. This feature enables optimization of distance measurement, object detection and power budget. The device’s single shot mode saves power by allowing designers to define the sampling period for initial object detection and approximate distance, while continuous mode more accurately measures distance. The ISL29501 also performs system calibration to accommodate performance variations of the external components across temperature and ambient light conditions. 

Key Features and Specifications

  • On-chip DSP calculates ToF for accurate proximity detection and distance measurement up to two meters
  • Modulation frequency of 4.5MHz prevents interference with other consumer products such as IR TV remote controls that operate at 40kHz
  • On-chip emitter DAC with programmable current up to 255mA allows designers to choose the desired current level to optimize distance measurement and power budget
  • Operates in single shot mode for initial object detection and approximate distance measurement, while continuous mode improve distance accuracy
  • On-chip active ambient light rejection minimizes or eliminates the influence of ambient light during distance measurement
  •  Programmable distance zones: allows the user to define three ToF distance zones for determining interrupt alerts
  •  Interrupt controller generates interrupt alerts using distance measurements and user defined thresholds
  •  Automatic gain control sets optimum analog signal levels to achieve best SNR response
  •  Supply voltage range of 2.7V to 3.3V
  •  I2C interface supports 1.8V and 3.3V bus

The ISL29501 can be combined with the ISL9120 buck-boost regulator to further reduce power consumption and extend battery life in consumer and home automation applications.

The ISL29501 signal processing IC is priced at $4.87 USD in 1k quantities. The ISL29501-ST-EV1Z reference design board is completely characterized and available now, priced at $250 USD. Customers can use it along with Intersil’s ToF GUI software and user’s guide to design their system with minimum effort.

 

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