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Application Note

page 29 of 33

V1.7

2022-08-01

XENSIV™ BGT60LTR11AIP shield

60 GHz radar system platform

Power consumption analysis

Figure 30

APRT enabled, Multiplier x2, no target detected, PRT switches to 1 ms

Figure 31

APRT enabled, Multiplier x16, no target detected, PRT switches to 8 ms

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Summary of Contents for XENSIV BGT60LTR11AIP

Page 1: ...C Infineon s 60 GHz radar chipset with antenna in package AIP In addition to the autonomous mode configuration the shield offers a digital interface for configuration and transfer of the acquired rada...

Page 2: ...Ds and level shifting 13 3 9 MMIC quad state inputs 14 3 10 Layer stack up and routing 15 4 Radar MMIC settings configuration 16 4 1 Operation mode 16 4 2 Detector threshold 18 4 3 Detector hold time...

Page 3: ...ction RCS The hold time is also configurable in 16 levels via QS3 pin see Table 6 which allows detection status holding up to 30 minutes The device operating frequency can be configured via QS4 pin se...

Page 4: ...n of systems Radar sensors offer the possibility to hide them inside the end product since they operate through non metallic materials Therefore it enables a seamless integration of technology in our...

Page 5: ...omments System performance Detection range m 5 7 Typical motion detection range for human target at low threshold in both E and H plane orientation Power supply Supply voltage V 1 5 3 3 5 0 Current co...

Page 6: ...ed with the marker on the Radar Baseboard MCU7 for correct alignment as shown in Figure 3 The castellated holes on the edges of the PCB provide additional access to the detector outputs and power supp...

Page 7: ...interrupt request IRQ line can be used to trigger the MCU when new data needs to be fetched 3 2 BGT60LTR11AIP MMIC The BGT60LTR11AIP MMIC Figure 5 serves as the main element on the BGT60LTR11AIP shiel...

Page 8: ...ignal assignment of the BGT60LTR11AIP MMIC VDD_RF A2 QS3 B1 PDET D1 QS4 M1 SPIDO B6 VTUNE C1 IFQ K1 TDET E1 PLL_TRIG G1 VDD_PLL M2 QS1 M6 VDD_RF B2 SPIDI B5 GND M4 GND N4 GND N6 GND N1 GND B3 GND A3 I...

Page 9: ...would then couple into and interfere with the analog domain without the decoupling filters The ferrite beads are chosen such that they can handle the maximum current of the sensor with a low DC resis...

Page 10: ...l high pass resistor RHP 4 M It is not recommended to use higher values as it will affect the Analog Base Band ABB settling time The DC blocking capacitors are important because the mixer output has a...

Page 11: ...olding bandwidth For this RC structure the low pass 3dB cutoff frequency 3 can be calculated under the following conditions 10 90 S H ON time 4 s Pulse width 5 s _ 300 3 0 35 0 35 4 87 5 Or based on t...

Page 12: ...ns can be seen in Figure 13 This EEPROM contains a descriptor indicating the type of the shield board and MMIC This is used by the firmware to communicate properly with the shield Figure 13 Connection...

Page 13: ...of Vin by using the circuit shown in Figure 14 In the circuit BGT_TARGET_DET and BGT_PHASE_DET are outputs of MMIC 1 5 V voltage level VDD_RF is 1 5 V and Vin is 3 3 V when connected with Radar Baseb...

Page 14: ...o offer more flexibility to the autonomous mode an Advance mode is enabled when the BGT_PLL_TRIG pin is kept 1 during chip boot and QS1 is either GND or OPEN where BGT_MOSI and BGT_SCK pins are also s...

Page 15: ...routing The PCB is designed with a 4 layer stack up with standard FR4 material Figure 16 shows the different layers and their thicknesses Figure 16 PCB layer stack up in 2D and 3D views In the routing...

Page 16: ...C 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 R3 DNP open Autonomous pulsed mode J1 DNP R3 DNP 100 k to...

Page 17: ...nomous mode Figure 18 Converting the shield to autonomous mode Note Once a BGT60LTR11AIP shield is converted to autonomous mode it should NOT be connected to a Radar Baseboard MCU7 to change the setti...

Page 18: ...ould be connected to VDD by removing R6 and placing R18 0 This will put the MMIC into Advance mode The default QS2 setting on the shield is for threshold 80 Recommended resistor values for changing th...

Page 19: ...put the MMIC into Advance mode The default QS3 setting on the shield for the hold time is 1s Recommended resistor values for changing the QS3 on the autonomous shield are detailed in Table 6 Table 6 Q...

Page 20: ...R4 DNP open 61 2 GHz J2 DNP R4 DNP 100 k to VDD 61 3 GHz J2 DNP R4 100 k VDD 61 4 GHz J2 DNP R4 0 DNP Do Not Populate Do Not Place SPI mode In SPI operation mode the user can set the device operation...

Page 21: ...us mode BGT_PLL_ TRIG BGT_MOSI BGT_SCK PRT PCB components 1 0 0 500 s J3 DNP R27 100 k J4 DNP R29 100 k 1 0 1 2000 s J3 DNP R27 100 k J4 100 k R29 DNP 1 1 0 250 s J3 100 k R27 DNP J4 DNP R29 100 k 1 1...

Page 22: ...D pins of the castellated holes and will generate internal detector outputs on TD TDet and PD PDet castellated holes depending on the movement of the target As shown in Figure 20 the output signals TD...

Page 23: ...red in autonomous CW mode is simulated along the H plane and E plane of the sensor The realized gain of the transmitting antenna in H plane and E plane at a frequency of 61 GHz is shown in Figure 22a...

Page 24: ...Autonomous mode a b Figure 23 Shield operation modes and motion detection status 6 2 1 Autonomous mode Hardware SHIELD_AUTONOM_BGT60 consisting of a BGT60LTR11AIP shield which is configured by defaul...

Page 25: ...and different angles Detection status Is driven from the internal detector output TDet Figure 25 and Figure 26 show respectively the measurement results in H plane and E plane and the right shield ori...

Page 26: ...nsing with SPI application available from the Radar Fusion GUI is used Height Board is placed at 1 2 m Scenario Measure the max detection range of a human target along the H plane and E plane of the s...

Page 27: ...e Repetition Time PRT With the default PW of 5 s which means the time BGT is active during one pulsing event the current consumption values of the MMIC are listed in Table 9 Table 9 Average current co...

Page 28: ...to the default value to ensure reliable detection Enabling the APRT as an additional power saving option reduces effectively the ON time of the MMIC since the default PRT is only used when a target is...

Page 29: ...01 XENSIV BGT60LTR11AIP shield 60 GHz radar system platform Power consumption analysis Figure 30 APRT enabled Multiplier x2 no target detected PRT switches to 1 ms Figure 31 APRT enabled Multiplier x...

Page 30: ...Note page 30 of 33 V1 7 2022 08 01 XENSIV BGT60LTR11AIP shield 60 GHz radar system platform Power consumption analysis Figure 32 APRT enabled Multiplier x16 target detected PRT switches back from 8 m...

Page 31: ...60 GHz radar system platform References 8 References 1 Infineon BGT60LTR11AIP 60 GHz radar MMIC datasheet 2 Infineon application note AN625 User s guide to BGT60LTR11AIP 3 Infineon application note AN...

Page 32: ...ode info V1 3 2021 03 16 Updated Figure 14 V1 4 2021 07 15 Major document updates to support shield V2 0 V1 5 2021 07 29 Updated Table 8 V1 6 2021 10 11 Added 2 Getting Started section Updated 5 Auton...

Page 33: ...intellectual property rights of any third party with respect to any and all information given in this application note The data contained in this document is exclusively intended for technically trai...

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