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Distance dToF Imager - TMF8821(SparkFun Qwiic)

The SparkFun Qwiic dToF TMF8821 Imager is an advanced direct Time-of-Flight (dToF) distance sensing module designed for accurate object detection and ranging applications. Based on the AMS TMF8821 multi-zone ToF sensor, it combines a 940nm Vertical Cavity Surface Emitting Laser (VCSEL), Single Photon Avalanche Diode (SPAD) array, and Time-to-Digital Converter (TDC) technology to achieve fast and precise distance measurements up to 5000mm. Unlike traditional single-point distance sensors, the TMF8821 provides multi-zone ranging with configurable detection areas including 3×3, 4×4, and 3×6 zones. This allows the sensor to detect multiple objects, analyze their positions, and improve reliability in dynamic environments. The integrated histogram processing and confidence output are handled internally, reducing the processing requirements of the host microcontroller. The sensor includes advanced ambient light rejection using an integrated optical filter, enabling stable operation from complete darkness to bright sunlight. With the SparkFun Qwiic I2C interface, the module provides easy solderless connection to compatible development boards such as Arduino, ESP32, and Raspberry Pi, while also exposing standard pins for traditional breadboard connections.

Package Includes

  • 1 x SparkFun Qwiic dToF Imager - TMF8821


Distance Laser Measuring
159.00 AED 159.00 AED (Tax included)

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Features

  • Long-Range Distance Measurement: Measures distances from 10mm up to 5000mm with high accuracy.
  • Direct Time-of-Flight Technology: Uses photon flight-time measurement for precise ranging.
  • SPAD Sensor Array: Provides high sensitivity and reliable detection in different lighting conditions.
  • Integrated 940nm VCSEL: Provides a safe Class 1 laser source for distance measurement.
  • Multi-Zone Detection: Supports 3×3, 4×4, and 3×6 detection zone configurations.
  • Adjustable Field of View: Supports up to 63° diagonal FoV using an integrated multi-lens array.
  • Ambient Light Rejection: Maintains stable performance under bright sunlight and indoor lighting.
  • On-Chip Processing: Performs histogram analysis and provides processed distance and confidence data.
  • Qwiic I2C Interface: Enables quick plug-and-play connection without soldering.
  • Low Power Operation: Suitable for portable and battery-powered applications.
  • Multiple Interface Options: Supports both Qwiic connectors and standard breakout pins.

Principle of Work

The TMF8821 operates using direct Time-of-Flight (dToF) technology. The onboard VCSEL emits short pulses of infrared light toward the target object. When the light reflects back, the SPAD detector measures the arrival time of individual photons with extremely high precision.

ams TMF8821 configurable 4x4 multi-zone Time-of-Flight Sensor Direct Time -of-Flight Sensors (dToF) | ams OSRAM

The internal Time-to-Digital Converter (TDC) calculates the exact flight time of the photons. Since the speed of light is constant, the sensor determines the distance by calculating the time difference between transmission and reception.

The multi-zone SPAD array divides the measurement area into multiple regions, allowing the sensor to identify objects across different positions. The onboard processor performs histogram analysis, ambient light compensation, and confidence calculations before sending the final measurement data through the I2C interface.

Pinout

TMF8821 Pinout Diagram

Pin Description Direction
GND Ground connection Power
3.3V Power supply input Power
SDA I2C data line Input/Output
SCL I2C clock line Input/Output
INT Interrupt output, goes low when new data is available Output
GP0/SYNC General purpose I/O or synchronization signal Input/Output
GP1 General purpose I/O Input/Output
EN Enable input (active high) Input

Wiring Example

Arduino / ESP32 / Raspberry Pi Connection:

TMF8821 Controller
3.3V 3.3V Power
GND GND
SDA I2C SDA
SCL I2C SCL
INT Optional GPIO Interrupt

Applications

  • Camera Laser Detect Autofocus (LDAF) systems.
  • Smart device presence detection.
  • Robotic object detection and collision avoidance.
  • Industrial safety light curtains.
  • Human presence monitoring systems.
  • Smart home automation devices.
  • Interactive displays and gesture-based interfaces.
  • Distance measurement and object tracking systems.

Technical Details

  • Sensor: AMS TMF8821 Multi-Zone dToF Sensor
  • Technology: Direct Time-of-Flight (dToF)
  • Measurement Range: 10mm to 5000mm
  • Detection Zones: 3×3, 4×4, 3×6
  • Light Source: Class 1 940nm VCSEL
  • Operating Voltage: 2.7V to 3.6V (3.3V recommended)
  • Active Current: Approximately 57mA
  • Standby Current: Approximately 8µA
  • Maximum Read Rate: 30Hz
  • Field of View: Up to 63° diagonal
  • Communication Interface: I2C
  • I2C Address: 0x41
  • Operating Temperature: -30°C to +70°C
  • Board Dimensions: 1.0 × 1.0 inch (25.4 × 25.4 mm)

Resources

Comparison

  • TMF8821 vs TMF8820: TMF8821 provides additional multi-zone configurations and improved object tracking flexibility.
  • dToF vs Traditional IR Sensors: dToF technology provides better accuracy and stronger resistance to ambient light interference.
  • I2C vs Analog Distance Sensors: Digital I2C communication provides more reliable measurements and easier integration.