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Distance dToF Imager - TMF8821(SparkFun Qwiic)
The SparkFun Qwiic dToF TMF8821 Imager is a compact and high-performance direct time-of-flight (dToF) sensor, engineered for accurate distance and object detection. It integrates advanced technologies including a Vertical Cavity Surface Emitting Laser (VCSEL) and Single Photon Avalanche Diode (SPAD) for precise range measurement up to 5000mm. The sensor employs a time-to-digital converter (TDC) and histogram-based data processing to improve measurement accuracy.
It supports multizone output configurations (3x3, 4x4, 3x6), making it suitable for tracking multiple objects. The integrated multi-lens array (MLA) enables a dynamic field of view (FoV) adjustment, expanding its sensing capability. The TMF8821 also features ambient light suppression using an on-chip optical filter, ensuring reliable operation from total darkness to bright sunlight.
The sensor is accessible via the Qwiic interface for solderless integration or through traditional pins for breadboarding, and it is ideal for applications such as camera autofocus, presence detection, robotic object avoidance, and industrial safety systems.
Package Includes
- 1 x SparkFun Qwiic dToF Imager - TMF8821
Features
- Long-Range Detection: Measures distances up to 5000mm with high precision.
- SPAD & TDC Technology: Combines SPAD and time-to-digital converters for enhanced detection.
- Multizone Output: 3x3, 4x4, and 3x6 configurations for multiple target tracking.
- Adjustable FoV: Up to 63° diagonal through a multi-lens array.
- Ambient Light Resistance: Built-in optical filter for stable performance in various lighting conditions.
- On-Chip Processing: Internal signal processing with confidence value output.
- I2C Interface: Connects via Qwiic or standard I2C headers.
- Low Power Consumption: Suitable for battery-powered applications.
Specifications
- Operating Voltage: 2.7V to 3.6V (3.3V typical via Qwiic)
- Current Consumption: 8µA (standby), 57mA (active)
- Sensor: AMS TMF8821 Multi-zone ToF
- Measurement Range: 10mm to 5000mm @ 30Hz
- Light Source: Class 1 940nm VCSEL
- Field of View: Up to 63° diagonally (adjustable)
- Maximum Read Rate: 30Hz
- Temperature Range: -30°C to +70°C
- I2C Address: 0x41
- Board Size: 1.0" x 1.0" (2.54cm x 2.54cm)
Pinout
| Pin | Description | Direction |
|---|---|---|
| GND | Ground | In |
| 3.3V | Power | In |
| SDA | Data | In/Out |
| SCL | Clock | In/Out |
| INT | Interrupt - goes low when data is ready | Out |
| GP0/SYNC | General purpose I/O or sync signal | In/Out |
| GP1 | General purpose I/O | In/Out |
| EN | Enable input - active high | In |
Applications
- Laser Detect Autofocus (LDAF)
- Presence detection for smart devices
- Object detection and collision avoidance for robots
- Industrial light curtains and safety systems
Features
- Long-Range Detection: Measures distances up to 5000mm with high precision.
- SPAD & TDC Technology: Combines SPAD and time-to-digital converters for enhanced detection.
- Multizone Output: 3x3, 4x4, and 3x6 configurations for multiple target tracking.
- Adjustable FoV: Up to 63° diagonal through a multi-lens array.
- Ambient Light Resistance: Built-in optical filter for stable performance in various lighting conditions.
- On-Chip Processing: Internal signal processing with confidence value output.
- I2C Interface: Connects via Qwiic or standard I2C headers.
- Low Power Consumption: Suitable for battery-powered applications.
Specifications
- Operating Voltage: 2.7V to 3.6V (3.3V typical via Qwiic)
- Current Consumption: 8µA (standby), 57mA (active)
- Sensor: AMS TMF8821 Multi-zone ToF
- Measurement Range: 10mm to 5000mm @ 30Hz
- Light Source: Class 1 940nm VCSEL
- Field of View: Up to 63° diagonally (adjustable)
- Maximum Read Rate: 30Hz
- Temperature Range: -30°C to +70°C
- I2C Address: 0x41
- Board Size: 1.0" x 1.0" (2.54cm x 2.54cm)
Pinout
| Pin | Description | Direction |
|---|---|---|
| GND | Ground | In |
| 3.3V | Power | In |
| SDA | Data | In/Out |
| SCL | Clock | In/Out |
| INT | Interrupt - goes low when data is ready | Out |
| GP0/SYNC | General purpose I/O or sync signal | In/Out |
| GP1 | General purpose I/O | In/Out |
| EN | Enable input - active high | In |
Applications
- Laser Detect Autofocus (LDAF)
- Presence detection for smart devices
- Object detection and collision avoidance for robots
- Industrial light curtains and safety systems