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World’s smallest integrated module for direct ToF distance measurement

 

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World’s smallest integrated module for direct ToF distance measurement
ams USA Inc.
October 2019
Sensors

The TMF8801 is more than 30% smaller than competing ToF sensors – making it perfect for com-pact space constrained designs – yet offers superior performance in important parameters including accuracy and usability in the presence of sunlight. Competing ToF sensors struggle to accurately measure distance below dirty or smudged cover glass whereas the TMF8801 maintains high accuracy through use of its on-chip histogram processing.

“The new TMF8801 direct ToF sensor which complements the TMF8701 short range ToF sensor released in 2018, provides extended distance range sensing for smartphones,” says Dave Moon, Senior Product Marketing Manager in the Integrated Optical Sensors business line at ams.
“The TMF8801 is ideally suited to provide support for improving world-facing mobile phone camera performance using laser detection auto-focus (LDAF), enabling mobile phone users to take pin-sharp photos and selfies.”

How do we achieve industry-leading accuracy?

With an integrated VCSEL infrared emitter, multiple SPAD (single photon avalanche photo-diode) light detectors, time-to-digital converter, and on-chip microcontroller for processing histograms, the TMF8801 delivers superior ToF performance. Compared to distance averaging employed with an indirect ToF system, the direct ToF time measurement methodology used in the TMF8801 delivers higher accuracy true-distance measurements.

When used to support LDAF, high accuracy distance measurements deliver improved camera performance: sharper, in-focused images under any ambient lighting conditions, and accurate adjustment of the camera flash brightness to improve picture quality.

TMF8801 1D Time-of-Flight Sensor

Not just for smartphones – further applications

The small size and low power consumption of the TMF8801 is ideal for fast-ranging collision avoidance detection used in autonomous vacuum cleaners, and industrial robotics. For display-based products such as mobile computing, the TMF8801 can be used for user presence detection to automatically wake up or put the system into a low-power sleep mode based on the presence or absence of a user.

  • Laser Detect Auto-Focus (LDAF)
  • Presence detection
  • Industrial ranging
  • People counting
  • Object and collision avoidance
  • Fast ranging navigation detection
  • Inventory control
  • Optical switch
  • Low-power system buffering of 3D cameras

The TMF8801 is housed in a 2.2mm x 3.6mm x 1.0mm package and is in volume production. Unit pricing is $2.89 in order quantities of 5,000 pieces. For sample requests and the evaluation board for the TMF8801, contact ams sales representatives.

Features

  • Direct ToF technology with high sensitivity SPAD detection
  • Fast Time-to-Digital Converter (TDC) architecture
  • Sub-nanosecond light pulse
  • 20 – 2,500mm distance sensing @ 30Hz
  • On-chip histogram processing
  • 940nm VCSEL Class 1 Eye Safety
  • Sunlight on-chip rejection filter and algorithm
  • Industry’s smallest modular OLGA 2.2 x 3.6 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 accurate distance measurements
  • 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] 2 - 250
Temperature Range [°C] -30 to 70
Packages OLGA, Pin Count 8
 

ams USA Inc.
20450 Stevens Creek Boulevard
Suite 200
Cupertino , CA 95014
United States


 
© Content credits: Some of this page uses material from ams.com .