Qs1 - Mmic Operation Modes; Qs2 - Detector Threshold - Infineon XENSIV BGT60LTR11AIP Manual

XENSIV™ BGT60LTR11AIP Radar Shield2Go
Super low-power 60 GHz Doppler radar sensor with antennas-in-package
Radar modes setup
4.2.3 QS1 – MMIC operation modes
QS1 is used to select the mode of the chip. By default, it is recommended to use either (advance) autonomous
mode or SPI mode. Advance mode allows the use of 15 instead of four threshold values for QS2 (threshold) and
QS3 (hold time). By default, this board comes with advanced autonomous and SPI mode settings. Change
resistor R_QS1 to enable/disable the other modes, by soldering it accordingly, as described in Table 3.
QS1 settings
Switch position –
QS1 mode
Left position (floating)
Right position
Right position
* R_QS1 is assembled with 0 Ω, 0603 (imp.)
4.2.4 QS2 – detector threshold
QS2 is used to select the detector threshold value; with the same radar cross-section as a target, a lower
detector threshold value corresponds to a higher detection range, which is written into register 2 (Reg2) as
described in the BGT60LTR11AIP User
Additionally, QS2 can be controlled by the 10 kΩ potentiometer R_QS2 to adjust the thresholds. To increase the
voltage, turn the knob clockwise; to reduce the voltage, turn the knob counterclockwise.
Figure 14 Rotation direction of R_QS2 potentiometer – detector threshold
QS2 settings – detector threshold
Pad
0*V /16 – 1*V /16
DD DD
1*V /16 – 2*V /16
DD DD
2*V /16 – 3*V /16
DD DD
3*V /16 – 4*V /16
DD DD
4*V /16 – 5*V /16
DD DD
5*V /16 – 6*V /16
DD DD
6*V /16 – 7*V /16
DD DD
7*V /16 – 8*V /16
DD DD
Application Note
QS1
Open (default)
100 kΩ to V
DD
V
DD
Guide.
Rotate potentiometer R_QS2 clockwise to increase the voltage and hence the
detection threshold. Rotate it counterclockwise to reduce the detection
Operation mode of the MMIC
Autonomous pulsed mode
SPI mode with external 9.6 MHz
clock enabled (FH3840024Z)
SPI mode
threshold.
Detector threshold
61 (left endpoint of potentiometer)
66
80
90
112
136
192
248
page 17 of 32
PCB configuration
Not important
(default)
R_QS1* = 100 kΩ
R_QS1* = 0 Ω
(default)
V1.0
2022-12-15