Infineon XENSIV BGT60LTR11AIP, Manual

Page: 21 / 33

Application Note page 21 of 33 V1.7
2022-08-01
XENSIV™ BGT60LTR11AIP shield
60 GHz radar system platform
Radar MMIC settings configuration
4.5 Pulse repetition time
The Pulse Repetition Time (PRT), is the duty cycle repetition rate, which means the time until the next pulsing
sequence starts in pulsed mode.
Autonomous mode
The PRT can be configured in autonomous pulsed mode (QS1 is either GND or OPEN as shown in Table 4), only
if the
“Advance mode” is enabled by keeping the PLL_Trig pin to “1” . The SPI pins BGT_MOSI and BGT_SCK are
sampled during chip boot-up and determine the PRT setting, as detailed in Table 8.
Figure 19 Configuring Pulse Repetition Time (PRT)
Table 8 PRT configuration in (pulsed) autonomous mode
BGT_PLL_
TRIG* BGT_MOSI BGT_SCK PRT PCB components
1 0 0 500 µs J3 = DNP R27 = 100 kΩ J4 = DNP R29 = 100 kΩ
1 0 1 2000 µs J3 = DNP R27 = 100 kΩ J4 = 100 kΩ R29 = DNP
1 1 0 250 µs J3 = 100 kΩ R27 = DNP J4 = DNP R29 = 100 kΩ
1 1 1 1000 µs J3 = 100 kΩ R27 = DNP J4 = 100 kΩ R29 = DNP
*R6 = DNP, R18 = 0 Ω , DNP = Do Not Populate/Do Not Place
SPI mode
In SPI pulsed operation mode, the user can set the PRT value by writing to dc_rep_rate (Reg7[11:10]) bit fields
of the MMIC SPI registers.
The user can also enable the Adaptive Pulse Repetition Time (APRT) by writing to aprt (Reg2[6]) bit field of the
MMIC SPI registers. The PRT multiplier factor, of 2, 4, 8 or 16, is also set by writing to prt_mult (Reg13[1:0]) bit
fields.
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