Texas Instruments Inc. (TI) today is rolling out a smaller, lighter, lower-power sensor that is said to deliver better accuracy for autonomous cars and industrial measuring applications.
Using what’s known as millimeter wave (mmWave) technology, the new 76-81 GHz single-chip sensor is said to offer 10-times better accuracy than commonly used predecessors. TI engineers foresee its use in long-range automotive vision applications, such as emergency braking, as well as in shorter-range applications, such as blind spot warning, park assist and occupant detection. They’re also targeting it at drones, robots, forklifts, traffic monitors and intelligent street lights.
Although mmWave sensors have existed for many years, TI’s new product is said to depart from the status quo in terms of packaging and precision. “This provides a savings on power, a savings on size, and much greater accuracy than was available before,” Sameer Wasson, general manager for radar and analytics processors at TI, told Design News.
|TI's new sensor is said to be about a quarter the size and weight of predecessors. (Source: Texas Instruments Inc.)|
TI says that the sensor’s resolution enables it to measure accurately down to the width of a human hair – about 5 µm. To demonstrate its sensitivity, TI engineers have calculated a human heart rate from five feet away by detecting the deflection of a person’s chest when the heart beats.
TI is introducing two families of sensors based on the technology – one for automotive and another for industrial applications. The automotive family includes the AWR1243 sensor, the AWR1443 sensor with an integrated microcontroller (MCU), and the AWR1642 sensor with an integrated MCU and digital signal processor (DSP). Similarly, the industrial family includes an IWR1443 with MCU and IWR1642 with MCU and DSP. All are single-chip solutions measuring 10.4 X 10.4 mm.
The key to the new design is the use of a CMOS (complementary metal oxide semiconductor) process that enabled TI engineers to integrate digital and analog circuits into a single chip. In contrast, mmWave sensor solutions up to now have typically employed discrete components, including transmitters, receivers, ADC/DAC, and processors.
“Combining all those discrete components into a single piece of silicon, you can save nearly three-quarters of the size and weight of today’s components,” noted Robert Ferguson, marketing director for industrial mmWave sensors at TI. Ferguson added that the new sensor burns about one-fourth as power as predecessors.
Using scalable software, the new sensor can also be programmed to transition from long range automotive radar applications to short range, Ferguson said. “So as you get off the freeway and go to park the car, the sensors can be dynamically reconfigured to focus on a different function,” he told us.
The same technology can also be applied to industrial applications, such as level sensing in a tank, perimeter security sensing, intelligent street lighting, traffic monitoring and people-counting. Its light weight also makes it a candidate for drones, TI said.