Infineon XENSIV BGT60LTR11AIP Manual
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AN608
XENSIV
BGT60LTR11AIP shield
™
60 GHz radar system platform
Board version 2.0
About this document
Scope and purpose
This application note describes the function, circuitry, and performance of the 60 GHz radar BGT60LTR11AIP
shield. The shield provides the supporting circuitry to the on-board BGT60LTR11AIP monolithic microwave
integrated circuit (MMIC) 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 radar data to a microcontroller board, e.g., Radar Baseboard MCU7.
Intended audience
This document is intended for anyone working with Infineon's XENSIV™ 60 GHz radar system platform.
Disclaimer
The platform serves as a demonstrator to perform simple motion sensing. The test data in this document
shows typical performance of demonstrator. However, board performance may vary depending on the printed
circuit board (PCB) manufacturer, specific design rules they may impose and components they may use.
Application Note
Please read the Important Notice and Warnings at the end of this document
V1.7
www.infineon.com
page 1 of 33
2022-08-01
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Table of Contents
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Summary of Contents for Infineon XENSIV BGT60LTR11AIP
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Page 1: About This Document
The shield provides the supporting circuitry to the on-board BGT60LTR11AIP monolithic microwave integrated circuit (MMIC) 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 radar data to a microcontroller board, e.g., Radar Baseboard MCU7. -
Page 2: Table Of Contents
XENSIV™ BGT60LTR11AIP shield 60 GHz radar system platform Introduction Table of contents About this document ........................1 Table of contents ..........................2 Introduction .......................... 3 60 GHz radar system platform ........................ 3 Key features ............................. 4 System specifications ......................5 BGT60LTR11AIP shield parameters ...................... -
Page 3: Introduction
The BGT60LTR11AIP shield demonstrates the features of the BGT60LTR11AIP MMIC and gives the user a “plug and play” radar solution. The shield can also be attached to an Arduino MKR board or an Infineon Radar Baseboard MCU7. A radar Graphical User Interface (GUI), is available via Infineon Developer Center (IDC) order to display and analyze acquired data in time and frequency domain. -
Page 4: Key Features
XENSIV™ BGT60LTR11AIP shield 60 GHz radar system platform Introduction Key features The BGT60LTR11AIP shield is optimized for fast prototyping designs and system integrations, as well as initial product feature evaluations. In addition, the sensor can be integrated into systems like laptops, tablets, TVs, speakers etc. -
Page 5: System Specifications
XENSIV™ BGT60LTR11AIP shield 60 GHz radar system platform System specifications System specifications BGT60LTR11AIP shield parameters Table 1 lists the various parameters of the BGT60LTR11AIP shield. Table 1 BGT60LTR11AIP shield specifications Parameter Unit Min. Typ. Max. Comments System performance Detection range –... -
Page 6: Hardware Description
The BGT60LTR11AIP shield is a very small PCB of 20 x 6.25 mm size. Mounted on top of the PCB is a BGT60LTR11AIP, Infineon’s 60 GHz radar sensor. The antennas are integrated into the chip package; therefore, the PCB can be manufactured using a standard FR4 laminate. The bottom side of the shield has the connectors to the Radar Baseboard MCU7 [1] (P1 and P2 in Figure 2). -
Page 7: Bgt60Ltr11Aip Mmic
XENSIV™ BGT60LTR11AIP shield 60 GHz radar system platform Hardware description 1.5V_RF 1.8V or 3.3V 1.5V_PLL 3.3V Castellated Holes 1.5V_RF PDet LED2 1.5V_RF TDet LED1 38.4 MHz EEPROM quartz Figure 4 Block diagram of the BGT60LTR11AIP shield The block diagram in Figure 4 depicts the configuration of the shield. When the shield is plugged into the Radar Baseboard MCU7, the MMIC’s supplies are initially deactivated. - Page 8 XENSIV™ BGT60LTR11AIP shield 60 GHz radar system platform Hardware description The integrated target detector circuits in the MMIC indicate the detection of movement in front of the radar and the direction of movement with two digital signals (BGT_TARGET_DET and BGT_PHASE_DET). See section 3.8 for more details.
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Page 9: Sensor Supply
XENSIV™ BGT60LTR11AIP shield 60 GHz radar system platform Hardware description Top view Side view Bottom view Figure 7 Top, side, and bottom views of the BGT60LTR11AIP MMIC package – all dimensions in mm Sensor supply Since radar sensors are very sensitive to supply voltage fluctuations or cross-talk between different supply domains, a low-noise power supply as well as properly decoupled supply rails are vital. -
Page 10: External Capacitors
XENSIV™ BGT60LTR11AIP shield 60 GHz radar system platform Hardware description Figure 9 The crystal circuit on the BGT60LTR11AIP shield External capacitors The BGT60LTR11AIP MMIC is duty-cycled and performs a sample and hold (S&H) operation for lower power consumption. The S&H switches are integrated in chip at each differential IQ mixer output ports. They are controlled synchronously via the internal state machine. -
Page 11: Connectors
XENSIV™ BGT60LTR11AIP shield 60 GHz radar system platform Hardware description Pulsed mixer output (AC + DC superposed) mixer_out hold Figure 11 External capacitors for BGT60LTR11AIP Longer pulse width can have a higher value. This leads to a reduced bandwidth (BW) of the RC filter ��... -
Page 12: Eeprom
XENSIV™ BGT60LTR11AIP shield 60 GHz radar system platform Hardware description The shield contains two Hirose DF40C-20DP-0.4V connectors, P1 and P2. The corresponding DF40C-20DS-0.4V connectors are on the Radar Baseboard MCU7. Figure 12 illustrates the pin-out of the Hirose connectors of the BGT60LTR11AIP shield. -
Page 13: Leds And Level Shifting
XENSIV™ BGT60LTR11AIP shield 60 GHz radar system platform Hardware description LEDs and level shifting The shield has two LEDs to indicate the motion detection (green) and target’s direction of motion (red), as shown in Figure 14, where R1 and R2 are limiting resistors. The digital block within the detector in the MMIC evaluates and sets the Target detect/Phase detect outputs of the BGT60LTR11AIP MMIC. -
Page 14: Mmic Quad State Inputs
XENSIV™ BGT60LTR11AIP shield 60 GHz radar system platform Hardware description MMIC quad state inputs The BGT60LTR11AIP MMIC has four quad-state inputs QS1-4, used in autonomous mode to set the device configuration. Figure 15 shows the default settings of these QS pins on the BGT60LTR11AIP shield. To offer more flexibility, to the autonomous mode, an “Advance mode”... -
Page 15: Layer-Stack Up And Routing
XENSIV™ BGT60LTR11AIP shield 60 GHz radar system platform Hardware description 3.10 Layer-stack up and 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 on the PCB, the VTUNE pin on BGT60LTR11AIP MMIC should be left floating. -
Page 16: Radar Mmic Settings Configuration
XENSIV™ BGT60LTR11AIP shield 60 GHz radar system platform Radar MMIC settings configuration 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. - Page 17 XENSIV™ BGT60LTR11AIP shield 60 GHz radar system platform Radar MMIC settings configuration Remove R3 for autonomous 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 settings via the GUI.
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Page 18: Detector Threshold
XENSIV™ BGT60LTR11AIP shield 60 GHz radar system platform Radar MMIC settings configuration Detector threshold The internal detector threshold, is the minimum signal strength that has to be reached to trigger a detection event. The lower the threshold set, the higher the sensitivity and therefore also the detection range. Note: To avoid triggering false detections, it would be better to increase the detector threshold, hence reduce the sensor sensitivity, especially in “noisy”... -
Page 19: Detector Hold Time
XENSIV™ BGT60LTR11AIP shield 60 GHz radar system platform Radar MMIC settings configuration Detector hold time The internal detector hold time, is the time for which the internal detector outputs remain active after target detection. Autonomous mode QS3 is used to select the detector hold time value for the autonomous mode. In order to have up to 16 hold time values, the PLL_TRIG should be connected to VDD by removing R6 and placing R18 = 0 Ω. -
Page 20: Operating Frequency
XENSIV™ BGT60LTR11AIP shield 60 GHz radar system platform Radar MMIC settings configuration Operating frequency Autonomous mode QS4 is used to set the operating frequency for the MMIC in the 60 GHz ISM band, which is important to meet worldwide regulation requirements, possible settings are detailed in Table 7. Table 7 QS4 settings Device operating frequency... -
Page 21: Pulse Repetition Time
XENSIV™ BGT60LTR11AIP shield 60 GHz radar system platform Radar MMIC settings configuration 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”... -
Page 22: Autonomous Mode Operation
Shield castellated holes Arduino pins Figure 21 Radar shield mounted on an Arduino MKR Wifi1010 board Find the BGT60LTR11 Radar Arduino Library and get started instructions on Infineon’s GitHub repository. Application Note page 22 of 33 V1.7 2022-08-01... -
Page 23: Measurement Results
XENSIV™ BGT60LTR11AIP shield 60 GHz radar system platform Measurement results Measurement results Radiation pattern To analyze the sensor radiation characteristics, the radiation pattern of the BGT60LTR11AIP shield, configured 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: Motion Detection Area
XENSIV™ BGT60LTR11AIP shield 60 GHz radar system platform Measurement results Motion detection area The measurements are conducted for different MMIC operation modes, and settings. Figure 23 below shows the possible operating modes, and how the detection status is driven. Sample QS pins Autonomous mode SPI mode inputs... -
Page 25: Spi Mode And Mmic Internal Detector
XENSIV™ BGT60LTR11AIP shield 60 GHz radar system platform Measurement results 6.2.2 SPI mode and MMIC internal detector Hardware • DEMO BGT60LTR11AIP, consisting of the Radar Baseboard MCU7 + BGT60LTR11AIP shield (which is configured by default in SPI pulsed mode) Firmware •... -
Page 26: Spi Mode And Motion Detection Algorithm
XENSIV™ BGT60LTR11AIP shield 60 GHz radar system platform Measurement results 6.2.3 SPI mode and motion detection algorithm Hardware • DEMO BGT60LTR11AIP, consisting of the Radar Baseboard MCU7 + BGT60LTR11AIP shield (which is configured by default in SPI pulsed mode) Firmware •... -
Page 27: Power Consumption Analysis
XENSIV™ BGT60LTR11AIP shield 60 GHz radar system platform Power consumption analysis Power consumption analysis Duty cycling The current consumption of the BGT60LTR11AIP MMIC can be optimized by configuring the duty cycle Pulse width (PW) and the Pulse Repetition Time (PRT). With the default PW of 5 µs, which means the time BGT is active during one pulsing event, the current consumption values of the MMIC are listed in Table 9. -
Page 28: Adaptive Pulse Repetition Time
XENSIV™ BGT60LTR11AIP shield 60 GHz radar system platform Power consumption analysis Adaptive pulse repetition time The Adaptive Pulse Repetition Time (APRT) is a power-saving option of the BGT60LTR11AIP MMIC. It consists of multiplying the PRT by a factor, of 2, 4, 8 or 16, when no target is detected by the internal detector. When a target is detected, the PRT returns to the default value to ensure reliable detection. - Page 29 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 Application Note page 29 of 33 V1.7 2022-08-01...
- Page 30 XENSIV™ BGT60LTR11AIP shield 60 GHz radar system platform Power consumption analysis Figure 32 APRT enabled, Multiplier x16, target detected, PRT switches back from 8 ms to 500 µs Application Note page 30 of 33 V1.7 2022-08-01...
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Page 31: References
XENSIV™ BGT60LTR11AIP shield 60 GHz radar system platform References References Infineon BGT60LTR11AIP – 60 GHz radar MMIC - datasheet Infineon application note – AN625 – User's guide to BGT60LTR11AIP Infineon application note – AN599 – Radar Baseboard MCU7 Infineon DEMO BGT60LTR11AIP software –... -
Page 32: Revision History
XENSIV™ BGT60LTR11AIP shield 60 GHz radar system platform Revision history Revision history Document Date of release Description of changes version V1.0 2020-06-03 First version – preliminary V1.1 2020-10-20 Mass market version V1.2 2020-11-17 Updated autonomous mode info V1.3 2021-03-16 Updated “Figure 14” V1.4 2021-07-15 Major document updates to support shield V2.0... - Page 33 Infineon Technologies hereby disclaims dangerous substances. For information on the types © 2022 Infineon Technologies AG. any and all warranties and liabilities of any kind in question please contact your nearest Infineon All Rights Reserved. (including without limitation warranties of non- Technologies office.