Time-of-flight sensing
Find out more about Time-of-flight (ToF) sensors from ams which enable highly accurate distance measurement and 3D mapping and imaging.
TMF8701 1D Time-of-Flight Sensor
Time-of-Flight sensor with 940nm integrated IR VCSEL in a 2.2mm x 3.6mm x 1.0mm optical module 1.8V I²C
Features
- Direct ToF technology with high sensitivity SPAD detection
- Fast Time-to-Digital Converter (TDC) architecture
- Sub-nanosecond light pulse
- 0 – 10cm proximity detection and 10 – 60cm distance sensing @ 60Hz
- On-chip histogram processing
- 940nm VCSEL Class 1 Eye Safety with 21° FOI
- Sunlight on-chip rejection filter and algorithm
- Industry’s smallest modular OLGA 2.2mm x 3.6mm x 1.0 mm package
Benefits
- Delivers high SNR, wide dynamic range and no multi-path reflections
- Enables “dark and sunlight environment” distance measurement within ±5%
- Provides best-in-class resolution ranging mode detection sensing
- Enables cm detect/release proximity events
- Provides high accuracy, greater distance between cover glass, dynamic cover glass calibration, dirt or smudge removal and crosstalk compensation
- Eye-safety circuitry stops VCSEL driver if VCSEL fault occurs
- Optical filters with algorithm support enables high ambient light resilience
- Reduce board space requirements, enables low-profile system designs in restricted space Industrial Designs
Product parameters
| Supply Voltage [V] | 2.7 - 3.3 |
|---|---|
| I²C Bus | 1.8V |
| Programmable | Mode setting, Repetition rate, Interrupt |
| Integrated Capabilities and Components | Ambient light immunity (100k lux to 0 lux) |
| Recommended Operating Distances [cm] | 60 |
| Temperature Range [°C] | -30 to 70 |
| Packages | OLGA, Pin Count 8 |
General Description
The TMF8701 is a true direct time-of-flight (ToF) sensor system in a single modular package which offers highly accurate depth accuracy detection through a sub-nanosecond light pulse and an antialiasing “stop-watch” method to measure round-trip time of pulse. It provides single zone detection of an object irrespective of the color, reflectivity and texture of the object.
The single module with VCSEL emitter offers high dynamic range and operates in either a proximity mode (0 – 10 cm) or a ranging mode (10 – 60 cm) for detection sensing. The device utilizes highly sensitive SPAD detection with fast compact time-to digital converters to make high accurate distance measurement within ±5% and is capable of operation in dark environments.
A built-in histogram is featured to detect cover glass and objects behind glass to select object with highest SNR while compensating for dirt and smudges on cover glass to produce artifact free measurement of multiple objects. The histogram enables greater distance between cover glass, delivers dynamic cover glass calibration and crosstalk compensation. Class 1 eye safety is also featured through the narrow sub-nanosecond (<500 ps) fast pulse 940 nm VCSEL driver. Background light noise is minimized through on-chip superior sunlight rejection filter. Data output is through a 1.8V I²C fast-mode communications interface and an integrated micro controller is featured with all algorithms included on-chip with no need for external optics.
The TMF8701 wins the Innovative Product of the Year Award at Sensors Expo 2019
This product suits for the following applications:
- 3D facial recognition
- Proximity detection
- Presence detection
- Object detection
- Distance measurement
- Collision avoidance
Resources
| Type | Description | Language | |
|---|---|---|---|
| Application Data | Schematic and Layout | English |
Technical Documents
| Type | Description | Language | |
|---|---|---|---|
| Product Brief | TMF8701 product overview | English | |
| Technical Note | Laser Certificate | English |
Environmental Documents
| Type | Description | Language | |
|---|---|---|---|
| RoHS Certificate | RoHS Certificate TMF8701 | English |
Other Information
| Type | Description | Language | |
|---|---|---|---|
| Block Diagram | TMF8701 Block Diagram | English |
