Quad-State Basics For Adjustable Qs1 To Qs4 Signals - Infineon XENSIV BGT60LTR11AIP Manual

XENSIV™ BGT60LTR11AIP Radar Shield2Go
Super low-power 60 GHz Doppler radar sensor with antennas-in-package
Radar modes setup
and SPICLK are also sampled to determine the PRT: dc_rep_rate (Reg7[11:10]). In addition, pins QS2 and QS3
are evaluated by the ADC and converted into 4-bit values before each "mean window".
By default, the Radar Shield2Go is pulled to VDD_RF (1.5 V) with a 100 kΩ resistor R14; hence, "autonomous
mode" is activated. Additionally, "advance mode" is activated.
When this pin is 0, when the digital main controller wakes up from reset, the chip boots like earlier versions,
only considering the four quad-state inputs below with their 2-bit information per pin.
PRT in "advance mode"
PLL_Trig
0
1
1
1
1
4.2.2

Quad-state basics for adjustable QS1 to QS4 signals

Switch QS1:
mode
Potentiometer R_QS2:
threshold
Figure 13 Overview of QS1 to QS4 signals on the BGT60LTR11AIP Radar Shield2Go from the top
The quad-state inputs QS1 to QS4 enable configuration of four different states with one input pin. Figure 13
shows the two switches QS1/QS4 and two potentiometers for the detector threshold (QS2) and hold time (QS3).
Table 3 shows possible input states and the resulting internal signals in the binary description. Quad-state
inputs are sampled at the start of the init sequence by the internal main controller at power-up. A change after
this sampling has no effect. Resampling can be triggered by setting the reset pin or activating the soft reset by
writing the corresponding bit in register 15 (Reg15). The reset pin is by default pulled to V
resistor R12.
In order to have up to 16 settings for QS2 (threshold) and QS3 (hold time), the PLL_TRIG should be connected to
V by removing R15 and placing R14 = 100 kΩ. This will put the MMIC into "advance mode". Note that advance
DD
mode is set by default.
Application Note
SPI_MOSI
*
0
0
1
1
page 16 of 32
SPI_CLK
*
0
1
0
1
Potentiometer R_QS3:
Hold time
dc_rep_rate
1/2 (fuse dependent)
1
3
0
2
Switch QS4:
mode
(3.3 V) via the 10 kΩ
DD
V1.0
2022-12-15