Application Note
page 16 of 33
V1.7
2022-08-01
XENSIV™ BGT60LTR11AIP shield
60 GHz radar system platform
Radar MMIC settings configuration
4
Radar MMIC settings configuration
The radar MMIC can be configured in both operation modes. In autonomous mode, the sensor configuration
parameters are set via QS pins and external resistors. In SPI mode, the connection to a microcontroller allows
setting the sensor configuration parameters by writing in the internal registers through SPI.
R3
R10
R9
R6
R18
R19 R20
Threshold
Hold time
Figure 17
QS1 to QS4 schematic and layout connections
4.1
Operation mode
The QS1 pin allows choosing the operation mode of the radar MMIC, as detailed in Table 4.
Table 4
QS1 settings
QS1
Operation mode of the MMIC
PCB configuration
ground
Autonomous continuous wave (CW) mode
J1 = 0 Ω
R3 = DNP*
open
Autonomous pulsed mode
J1 = DNP*
R3 = DNP*
100 kΩ to V
DD
SPI mode with external 9.6 MHz clock enabled
J1 = DNP*
R3 = 100 kΩ
V
DD
(default)
SPI mode
J1 = DNP*
R3 = 0 Ω
*DNP : Do Not Populate/Do Not Place
The DEMO BGT60LTR11AIP comes with the BGT60LTR11AIP shield configured in SPI mode, to enable the radar
MMIC configuration via the firmware running on the Radar Baseboard MCU7 microcontroller.
To make the shield work in autonomous mode, you need to remove R3 resistor as shown in Figure 18.
VDD_RF
GND
VDD_RF
R9
DNP
R19
DNP
QS2
QS3
VDD_RF
VDD_RF
R3
0R
R4
DNP
QS1
QS4
GND
GND
GND
VDD_RF
GND
R6
0R
BGT_MOSI_1.5_A
BGT_SCK_1.5_A
R27
100K
R29
100K
GND
GND
VDD_RF
VDD_RF
J3
DNP
J4
DNP
J1
DNP
J2
0R
BGT_PLL_TRIG_1.5
R18
DNP
R20
DNP
R10
0R
