The ISL29501 is a Time of Flight (ToF) based signal processing integrated circuit. The sensor enables low cost, low power, and long range optical distance sensing when combined with an external emitter and detector. The ISL29501 has a built-in current DAC circuit that drives an external LED or laser. The modulated light from the emitter is reflected off the target and is received by the photodiode. The photodiode then converts the returned signal into current, which is used by the ISL29501 for signal processing. An on-chip Digital Signal Processor (DSP) calculates the time of flight, which is proportional to the target distance. The ISL29501 is equipped with an I2C interface for configuration and control. Use of an external photodiode and emitter allows the user to optimize the system design for performance, power consumption, and distance measurement range that suit their industrial design. The ISL29501 is wavelength agnostic and permits the use of other optical wavelengths if better suited for applications.


  • Enables proximity detection and distance measurement
  • Modulation frequency of 4.5MHz
  • Emitter DAC with programmable current up to 255mA
  • Operates in Continuous and Single Shot mode
  • On-chip active ambient light rejection
  • Auto gain control mechanism
  • Interrupt controller
  • Supply voltage range of 2.7V to 3.3V
  • I2C interface supporting 1.8V and 3.3V bus
  • Low profile 24 Ld 4x5 QFN package


  • Mobile consumer applications
  • Industrial proximity sensing
  • Power management
  • Home automation


Title language Type Format File Size Date
star ISL29501 Datasheet
PDF 1002 KB
AN1984: Temperature and Ambient Light Error Correction
Application Note
PDF 611 KB
AN1967: Temperature and Ambient Light Data Collection
Application Note
PDF 185 KB
AN1983: Best Practices for TOF Crosstalk Calibration
Application Note
PDF 322 KB
AN1966: ISL29501 Sand Tiger Optics Application Note
Application Note
PDF 1.14 MB
AN1917: ISL29501 Layout Design Guide
Application Note
PDF 422 KB
ISL29501 Evaluation Software User Guide
Manual - Development Tools
PDF 1.23 MB
ISL29501-CSEVKIT1Z User Guide
Manual - Development Tools
PDF 1.06 MB
ISL29501-ST-EV1Z Sand Tiger User Guide
Manual - Development Tools
PDF 3.95 MB


Title language Type Format File Size Date
ISL29501-CS-EVKIT1Z Design Files
PCB Design Files
ZIP 1.36 MB
ISL29501 Evaluation Software
Software & Tools - Evaluation Software
ZIP 2.26 MB

memoryBoards & Kits

Part Number Title Type Company
ISL29501-CS-EVKIT1Z Time of Flight (ToF) Distance Measurement Evaluation Kit - Cat Shark Evaluation Renesas
ISL29501-ST-EV1Z Time of Flight (ToF) Distance Measurement Evaluation Kit - Sand Tiger Evaluation Renesas