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TI OPT3101 Optical Ranging Chip

03.11.2019

OPT3101 AFE is a new chip for determining the distance to an object by measuring the time of flight of photons. OPT3101 contains an analog part and an integrated LED driver. The device is connected to an external photodiode and an emitter such as LED, VCSEL or LASER. There is an I2C interface for outputting data on the distance to the object.

The microcontroller can directly read the distance data, so there is no need to do additional calculations on the external MCU. All processing and accounting for corrections for crosstalk, initial and temperature drift are performed on the chip. The device also provides temperature measurement and output from the built-in sensor. The OPT3101 can operate at up to 4000 measurements per second.

Given the high ambient light suppression ratio, the device can operate in bright sunlight (up to 130klx). The timing sequencer can be flexibly configured to provide the best balance of power and performance for a specific application.

The device provides range data consisting of phase, amplitude, and environmental measurements. The calibration subsystem supports phase data error compensation to eliminate errors caused by temperature and crosstalk.

When using a special reflector, the measurement range can reach 40 meters.

Features of OPT3101:

Measurement of distance at a distance of up to 15 meters;
Object detection and collision avoidance;
Choice of photodiodes and emitters;
Measurement frequency up to 4000 times per second;
16-bit output signal when operating at a distance of 15 m;
Flexible sequencer settings to increase the range up to 75 meters;
Support for three transmitter channels for multi-zone operation;
Operates with external illumination of the object up to 130 lux;
Distance measurement regardless of the reflectivity of the object;
Built-in LED driver with programmable current up to 173 mA;
Built-in temperature sensor for calibration;
I2C interface for control and data transmission;
Operating ambient temperature: -40...85°C.

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