Infineon XENSIV BGT60LTR11AIP, Manual

Page: 18 / 33

Application Note page 18 of 33 V1.7
2022-08-01
XENSIV™ BGT60LTR11AIP shield
60 GHz radar system platform
Radar MMIC settings configuration
4.2 Detector threshold
The internal detector threshold, is the minimum signal strength that has to be reached to trigger a detection
event. The lower the threshold set, the higher the sensitivity and therefore also the detection range.
Note: To avoid triggering false detections, it would be better to increase the detector threshold, hence
reduce the sensor sensitivity, especially in
“ noisy ” environment.
Autonomous mode
QS2 is used to select the detector threshold value for the autonomous mode. In order to have up to 16
threshold values, the PLL_TRIG should be con
nected to VDD by removing R6 and placing R18 = 0 Ω. This will put
the MMIC into “Advance mode” . The default QS2 setting on the shield is for threshold 80.
Recommended resistor values for changing the QS2 on the autonomous shield are detailed in Table 5.
Table 5 QS2 settings
Resistors setting
Detector Threshold
(Radar Fusion GUI setting)
Sensitivity
(Radar GUI setting)
R9 R10
10 kΩ 330 Ω 61 15*
10 kΩ 1 kΩ 66 14*
10 kΩ 1.8 kΩ 80 13
10 kΩ 2.7 kΩ 90 12
10 kΩ 3.9 kΩ 112 11
10 kΩ 5.6 kΩ 136 10
10 kΩ 6.8 kΩ 192 9
10 kΩ 8.2 kΩ 248 8
10 kΩ 12 kΩ 320 7
10 kΩ 15 kΩ 284 6
10 kΩ 18 kΩ 480 5
10 kΩ 27 kΩ 640 4
10 kΩ 39 kΩ 896 3
10 kΩ 56 kΩ 1344 2
10 kΩ 100 kΩ 1920 1
10 kΩ 22 0 kΩ 2560 0
*High sensitivity levels could lead to false detections, are not shown on the Radar GUI settings.
SPI mode
In SPI operation mode, the user can set the internal detector threshold by writing to thrs (Reg2[12:0]) bit fields
of the MMIC SPI registers.