TMF8701-1BM

TMF8701 Time-of-Flight Sensor The TMF8701 is a true direct time-of-flight (ToF) sensor system General Description 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 IC fast-mode communications interface and an integrated micro controller is featured with all algorithms included on-chip with no need for external optics. The benefits and features of TMF8701, Time-of-Flight Sensor Key Benefits & Features are listed below: Figure 1: Added Value of Using TMF8701 Benefits Feature Modular package - 2.2mm x 3.6mm x 1.0mm Small footprint fits in the mobile phone bezel 21 FOI Detecting central closest objects Within 5% of measurement (accuracy) no Time-to-Digital converter (TDC) multi-path and no multiple object problems as for Direct time-of-flight measurement iToF Better accuracy detects reliably closest object Single Photon Avalanche Photodiode (SPAD) Min. distance 1mm (black target) Histogram based architecture Max. distance 60cm Dynamic cover glass calibration No complex calibration Reliable operation under demanding use cases Compensates for dirt on glass ams Product Brief Page 1 v1-05 2018-Dec-21 Document FeedbackT M F8 7 01 Applications Benefits Feature Reference SPAD Improved accuracy over temperature and life Distance and signal quality reported Make better decisions Fast VCSEL driver with protection Class 1 Eye Safe 940A power consumption at 10Hz (proximity mode) 26mA power consumption at 60Hz operation Longer battery life (distance and proximity mode) 0.26A power-down current consumption (EN=0) The device is ideal for use in the mobile phone market with Applications applications including: Distance measurement for camera autofocus (Laser Detect Autofocus - LDAF) Supporting low-power system operation by enabling high-power components (i.e. 3D facial recognition) only when an object is in the detection range Proximity detection Presence detection - Object detection Collision avoidance The functional blocks of this device are shown below: Block Diagram Figure 2: TMF8701 Block Diagram TMF8701 Optics TOF Sensor EN Driver VCSEL GPIO1 Reflective Control GPIO0 INT Internal Surface Host SPAD, Reflection SDA Data SCL TDC and Process Optical Histogram Filter Cortex M0 Background Light Page 2 ams Product Brief Document Feedback v1-05 2018-Dec-21 VDD GND VDDC GNDC