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Completely Autonomous Radar Sensor for Smart Motion Sensing

Figure 4: BGT60LTR11AIP MMIC block diagram

Hence, the all-in-one solution enables fast
prototyping, simple system integration, and
initial product feature evaluations.
QUAD STATES ALLOW EASY SWITCH
BETWEEN AUTONOMOUS MODE
AND SPI MODE
Four quad-state (QS1–4) input pins allow
flexible performance parameters even when
the sensor is running in autonomous mode.
For instance, the user can easily select
between multiple threshold values at QS2 to Figure 5: Shield with supporting circuitry to the BGT60LTR11AIP MMIC
increase or reduce the detector sensitivity
and, therefore, the detection range. The
following table displays the QS parameter the interface can also be used for extracting directly to products to add radar functionality
settings: the radar raw data for signal processing or quickly and to add smartness to traditional
for developing customized algorithms. applications to wake them up or put them to
QS Parameter Therefore, the shield can also be attached sleep based on motion/no-motion detection.
1 Radar operation mode to an Arduino MKR board or an Infineon Integrated detectors and a state machine
2 Detector sensitivity MCU7 radar baseboard. enable autonomous operation with digital
(comparator threshold voltage) Infineon’s toolbox supports this platform output signals in addition to the semi-
3 Signal hold time after target detection with demonstration software and a radar autonomous and SPI modes. Hardware preset
4 Device operating frequency graphical user interface to display and analyze pins, so-called quad states, allow users to
acquired data in time and frequency domain. easily set radar operation parameters even
Experienced radar users can utilize the in the completely autonomous mode of the
semi-autonomous and SPI modes by chang- SUMMARY chip. With all of these features plus low power
ing the operation mode with a QS1 pin. For This radar-based motion sensor developed by consumption, the BGT60LTR11AIP is a com-
example, in the case of an already existing Infineon is suitable for various motion- pelling, smart, and cost-effective replacement
microcontroller, the chip parameters can be sensing applications such as lighting control, for conventional PIR sensors. ■
set precisely via SPI, but the detection can automated door opening, security systems,
still be done via the integrated detectors. In and other typical smart-home devices. The REFERENCES
the completely non-autonomous SPI mode, user-friendly radar solution can be applied 1 Yole, “Status of the Radar Industry,” 2020.

FEBRUARY 2021 | www.eetimes.eu