ams has introduced a 1D time-of-flight distance measurement and proximity sensing module that is ideal for implementing presence detection, for example to trigger the operation of a facial recognition system when the user’s face is in range.
Supplied in a 2,2 x 3,6 x 1,0 mm package, the TMF8701 integrates a VCSEL infrared emitter, multiple SPAD (single photon avalanche photodiode) light detectors, time-to-digital converter, and a histogram processing core. The device implements all histogram-based presence detection, distance measurement and proximity sensing algorithms on-chip.
The TMF8701 separately identifies reflections from fingerprint smudge contaminations on the display screen and optical reflections from objects beyond the cover glass, such as the user’s face, maintaining reliable performance even when the sensor’s aperture is dirty.
The Class 1 Eye Safe VCSEL emitter has enhanced immunity to interference from ambient light and produces accurate distance measurement in all lighting conditions: the module achieves accuracy of ±5% when measuring distance in the 20-60 cm range in normal lighting conditions. Even in bright sunlight (100 klux), ±5% accuracy is maintained at a range of up to 35 cm.
The low-power operation of the TMF8701 – it draws only 940 μA in proximity sensing mode when sampling at 10 Hz – makes it the ideal companion to a smartphone’s face recognition system. Always on, it triggers the higher-power face recognition system to start up when the time-of-flight sensor detects the presence of an object up to 60 cm from the display screen.
The proximity sensing capability of the device can also be used to trigger the display and face recognition system to switch off when detecting a reflective surface at a distance of 0-10 cm from the screen. The accuracy of the TMF8701’s distance measurements also supports the selfie camera’s LDAF (laser detect auto-focus) function, especially in low-light conditions.
Cooling solutions for modern electronics Future Electronics
Passive Components
As electronic systems become more compact and powerful, effective thermal management has become a critical aspect of product design.
Read more...Digital isolators for I2C interfaces
Analogue, Mixed Signal, LSI
Würth Elektronik has expanded its range of digital isolators with 2-channel bidirectional isolators for I2C communication interfaces.
Read more...Same Sky expands rectangular connector portfolio Future Electronics
Interconnection
The portfolio includes male pin headers, female pin headers, and box headers, giving engineers the flexibility to select the most appropriate connector style for their specific design requirements.
Read more...Advanced sensing powers modern drones Future Electronics
DSP, Micros & Memory
Allegro MicroSystems has a portfolio of sensors, motor drivers, and power management devices specifically designed to enhance drone efficiency, reliability, and control.
Read more...Rapid IoT prototyping simplified Future Electronics
Test & Measurement
The STEVAL-MKBOXPRO from STMicroelectronics is a compact, ready-to-use wireless development kit designed to accelerate the creation of intelligent IoT and wearable applications.
Read more...Ultra-low-power smart metering EBV Electrolink
Analogue, Mixed Signal, LSI
ScioSense’s UFC23 sensor combines improved resolution and offset stability with ultra-low standby current, enabling high-end battery-powered water, heat, gas and leak detection meter designs.
Read more...Industrial vibration sensing simplified Altron Arrow
Analogue, Mixed Signal, LSI
The IIS3DWBG1 from STMicroelectronics is a high performance, three-axis digital vibration sensor engineered for demanding industrial applications where accurate motion monitoring is essential.
Read more...Cortex-M33 performance for cost-sensitive designs Future Electronics
DSP, Micros & Memory
The STM32C5 series from STMicroelectronics introduces a new generation of entry-level microcontrollers engineered to deliver enhanced processing capability, modern security, and cost-effective scalability for connected embedded applications.
Read more...Understanding two key tools for cleaner serial data Altron Arrow
Editor's Choice Analogue, Mixed Signal, LSI
Understanding how pre-emphasis and equalisation works, and when to use one over the other, is critical when designing reliable high-speed systems.
Read more...Next generation HMI processing platform Future Electronics
DSP, Micros & Memory
Microchip’s latest hybrid MCU SiP integrates an Arm926EJ-S processor with 512 Mb of DDR2 SDRAM and is engineered to meet the rising demand for sophisticated HMI solutions in modern vehicles.
While every effort has been made to ensure the accuracy of the information contained herein, the publisher and its agents cannot be held responsible for any errors contained, or any loss incurred as a result. Articles published do not necessarily reflect the views of the publishers. The editor reserves the right to alter or cut copy. Articles submitted are deemed to have been cleared for publication. Advertisements and company contact details are published as provided by the advertiser. Technews Publishing (Pty) Ltd cannot be held responsible for the accuracy or veracity of supplied material.
printer friendly version