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ISL29501

Obsolete

Time of Flight (ToF) Signal Processing IC

Alternative(s) Available
NRND - No Recommended Replacements Available - NRND
  • Notes:ISL29501 is not recommended for new designs and has no alternative product available.

Features

  • 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
ISL29501 Functional Diagram
ISL29501 Functional Diagram

Description

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.

Applications

  • Precise long-range distance measurement
  • Drone / robot collision avoidance and soft landings
  • Industrial automation
  • Car parking sensors
  • Gate and door sensors
  • Silo level monitoring
  • Intermodal and ocean container cargo loading sensors
  • Human presence detection and obstacle avoidance
  • Smart homes and offices
  • Smart appliances, toilets and fixtures
  • Smart kiosks
  • People counting
Part NumberStatusSamplesStockRoHSPackageLead Count (#)Carrier TypeMoisture Sensitivity Level (MSL)Pb (Lead) FreePb Free CategoryTemp. Range (°C)
ISL29501IRZ-T7ObsoleteN/AIn StockRoHS:EN
QFN24#Reel1YesPb-Free 100% Matte Tin Plate w/Anneal-e3-40 to +85°C
ISL29501IRZ-T7AObsoleteN/AIn StockRoHS:EN
QFN24#Reel1YesPb-Free 100% Matte Tin Plate w/Anneal-e3-40 to +85°C
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    Recommended Documents (1)

  1. Datasheet
    ISL29501 Datasheet
    RECOMMENDED
    PDF 1001 KB FN8681 Mar 17, 2022

    Datasheets (1)

  1. Datasheet
    ISL29501 Datasheet
    RECOMMENDED
    PDF 1001 KB FN8681 Mar 17, 2022

    Manuals & Guides (1)

  1. Manual - Development Tools
    ISL29501 Evaluation Software Manual
    PDF 1.31 MB UG054 Apr 11, 2022

    Application Notes & White Papers (6)

  1. Application Note
    AN1984: Temperature and Ambient Light Error Correction
    PDF 442 KB AN1984 Apr 11, 2022
    AI-generated Summary: Temperature and ambient light error correction requires independent data sweeps, changing only one variable at a time. Standard calibration must be loaded before data collection. Temperature data is collected by placing the device in an oven and ramping temperature in 5°C steps, recording phase shifts. Ambient light correction involves varying light intensity using an 850nm LED while keeping temperature constant. Data is used to generate error coefficients programmed into the chip to improve measurement accuracy under varying conditions.
  2. Application Note
    AN1967: Temperature and Ambient Light Data Collection
    PDF 164 KB AN1967 Apr 11, 2022
    AI-generated Summary: Renesas provides technical specifications, design resources, and safety information "as is" without warranties, placing responsibility on developers to select, design, validate, and test applications using Renesas products. Usage is limited to development with Renesas products, prohibiting reproduction or other uses. Renesas disclaims liability and requires indemnification for claims arising from use. All trademarks belong to their respective owners.
  3. Application Note
    AN1983: Best Practices for TOF Crosstalk Calibration
    PDF 331 KB an1983 Apr 06, 2022
    AI-generated Summary: The document explains best practices for Time-of-Flight (TOF) crosstalk calibration, emphasizing the importance of covering only the photodiode (PD) with an 850nm light blocker to prevent erroneous calibration caused by reflections. It details how reflections inside the glass and setup can cause optical crosstalk, affecting distance measurements. Proper blocker placement, material choice, and calibration procedures ensure accurate crosstalk measurement and compensation during normal operation. Calibration must be done at normal emitter current levels, and the blocker must fully cover the PD's field of view without interfering with the emitter.
  4. Application Note
    AN1724: ISL29501 Firmware Routines
    PDF 205 KB AN1724 Apr 06, 2022
    AI-generated Summary: Calibration procedures include three routines: magnitude, crosstalk, and distance calibration. Magnitude calibration is an internal process that compensates for chip changes without emitting light and takes less than one second. Crosstalk calibration cancels unwanted electrical signals by averaging 100 measurements with the emitter blocked, taking up to 15 seconds. Distance calibration averages 100 measurements at a known reference distance to compensate for phase delays, also taking up to 15 seconds. Each calibration requires preset emitter current, sample period, and integration time.
  5. Application Note
    AN1966: ISL29501 Sand Tiger Optics Application Note
    PDF 1007 KB AN1966 Apr 06, 2022
    AI-generated Summary: The system field of view (FOV) results from the overlap of the emitter radiation and detector FOV distributions, with the emitter’s narrower distribution defining the system FOV for Sand Tiger at ±2.75°. FOV is simplified as a cone with a Full Width Half Maximum (FWHM) angular width. Signal photocurrent depends on emitter power, detector area, responsivity, target distance, and target properties. Measurements use a Lambertian target, showing signal strength decreases with the square of distance. The detector lens enhances signal collection by focusing light onto the photodiode. Signal current values for various distances are provided for a 100mA emitter drive.
    6. View More (6)

    Product Notices (PCN, EOL, etc) (1)

  1. End Of Life Notice
    PLC25006 - End of Life Notice
    PDF 597 KB Apr 04, 2025
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    Software & Tools (2)

  1. Software & Tools - Other
    Temperature and Ambient Coefficient Generator
    ZIP 11 KB Jan 18, 2017
  2. Software & Tools - Evaluation Software
    ISL29501 Evaluation Software
    ZIP 2.26 MB isl29501-gui-software Nov 17, 2017
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Support Communities

  1. isl29501

    i can not get 1.7v voltage at pin21 and 0.7v voltage at pin22 of the ISL29501,but i can read and write all of registers over  I2C interface,can someone give me a hand to figure the problem out?

    Oct 10, 2024
  2. ISL29501 light prox sensor DSP - possible to multiplex multiple N LED emitters + sensors? Other guidance?

    ISL29501 light prox sensor DSP:   possible to multiplex multiple N LED emitters + sensors? Other guidance?Certainly seems possible & we can 'poll' in single shot mode from firmware w/FW driving mux selector.  [We don't need to run at peak speed, and do not need 'max distance'.]Any ...

    Dec 18, 2019
  3. ISL29501 Driver Development

    ... reg(ISL29501_I2C_ID, 0xB0, 0xD7); write_reg(ISL29501_I2C_ID, 0xB0, 0xD1); k_msleep(100); write_reg(ISL29501_I2C_ID, 0x10, 0x04); write_reg(ISL29501_I2C_ID, 0x11, 0x6E); write_reg(ISL29501_I2C_ID, 0x13, 0x71); write_reg(ISL29501_I2C_ID, 0x60, 0x00); write_reg(ISL29501_I2C_ID, 0x18 ...

    Mar 27, 2023
View All Results from Support Communities (6)
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