 This week's IonMPI, which by Digi-Key is INFINION. Lady, what is the new product of the week this week? Okay, I'm glad you asked. This week's IonMPI is the long one, the INFINION BGT60LTR11AIP, which yes, it's my favorite. And this is a pretty amazing chip and we'll show it maybe on the microscope later. It's a all in one 60 gigahertz radar module that's not only is it a full like radar module, but the antenna is built in as well. Very cool. So this is a 60 gigahertz Doppler radar sensor. It's only about six and a half by three and a half millimeters wide, got a BGA pads on the bottom and then the cool like weird golds thing with squares with feet. Those are the antennas on top. It's configurable, but it also has a very basic autonomous mode where it just tells you if motion was detected and the direction of the motion, whether it's coming towards or away from you. But for more advanced usage, there's also an SPI interface and pretty much everything is integrated like you basically just need a crystal and a couple of passives and you're ready to go. So Doppler in case this is a nice image from Wikipedia, Doppler in case you're not aware of how this works is compared to infrared reflective sensors, right? Infrared reflective sensors like IR and time of flight, they send a wave of light and then they measure how much was reflected back and so it's like a quantity time of flight they measure the time it takes, Doppler a little bit different. What it does is it can detect the motion because as something's moving, the high frequency waves that you bounce back, the frequency shifts just slightly called the Doppler effect. This is commonly when you're in high school or grade school, when you're listening to a siren as a fire truck goes by, the Doppler effect makes the frequency change as it passes you and that motion, wow, wow. So that effect of things in motion, the waves that are emitted or hitting them that bounce back change in frequency slightly, that's the effect and so you can measure the speed of something and it's often again, Dopplers are used for radar detecting of cars. So you have those radar detector guns that traffic police use, they bounce a radar off of you, they can tell how fast you are going without having to like count ticks or something. And mailboxes. So we've talked before about using radar for detecting speed but another useful thing that these radar Doppler sensors are used for is to detect whether a human is there and usually you do human detection not with time of flight sensors or with infrared you use it for a hand but usually use a PIR sensor and PIR sensors are great for locating and measuring whether something that emits infrared light, your heat is moving. So people, large animals, you'll see these often in restrooms where you know when you open the restroom it detects that there's a human there or sometimes if you're in front of a door it detects and it opens the door. Zoo PIR sensors are very common, very inexpensive and they've been around for a long time. There's a couple downsides of PIR, this is from Infineon's documentation and they did a really good job here. So PIRs I will say they're going to be less expensive but there's a couple of things where radar sensors are better. So first off they can have wider range, 24 gigahertz especially, you can be a couple meters range or more and like with the car detection you can be a quarter of a mile. One thing that's nice about radar compared to PIR is PIR only detects if there's movement whereas because you have that Doppler effect you can tell whether something is leaving or entering the area like it detects the motion forward or backwards and so their example is of an automatic door right you only want the door to open as people are entering and you know not exiting like it knows whether you're pat you've just passed the door or whether you're entering the door you know this is like the science fiction movie thing where it's like how does the door know when like which direction you move because they have radar sensors in the future not PIR. Most important thing is that you can put a radar sensor behind a material and it doesn't have to be it can be opaque to light but whereas PIR sensors they have a lens and you can't have anything blocking the lens like it has to be exposed and so you can see a PIR sensor because it's got this gray or white blobby you know lens thing whereas radar can be put behind a material like wood or plastic it doesn't have to be visible so it can have a glass it can have a much nicer look. So overall you know for a lot of things like sensitivity and resolution and direction and distance and different materials and size they're also the sensors are much smaller than laser or which is time of flight or ultrasonic sonar or infrared or PIR but they're not as cheap right so they are less expensive and they're a little bit more complicated but this LTR the BGT-60 is a great sensor to get started so here's the block diagram again it does kind of everything for you you wire it up has an antenna built-in you just have to give it a crystal it can run on its own it's got a you know p-detect and t-detect at the top is the built-in capabilities the mode select at the top the QS 1 through 4 you can tell it whether you want to be in autonomous mode and how sensitive you want the autonomous mode to be or there's an SPI mode as well compared to this BGT-24 this is the 24 gigahertz again the 60 gigahertz it's higher frequency the antenna is much smaller you can see the antenna on this shield you know it's up gets up two inches by one inch it's not it's small but it's not tiny the BGT-60 is much much smaller one thing to note power supply you will need to give it 1.5 volts on the logic level as well I think it's so I just be aware when you wire this up to your 3 volt my controller you'll need to give it a regulator and a little shifting if you don't want to deal with the BGA package you can get it in this cute BGT-60 LTR 11 IP shield it's minimal right it's not that much bigger than the chip itself and it has the crystal I think has some a regulator built in it only has the four pins though power ground motion trigger and directional so it only gives you like four bits whether somebody's moving or not and which direction they're moving in towards or away from the sensor but there's also a little dev board that you can plug it into but that's like the most minimal solution there's also this like fancy board that's the thing I showed yesterday the demo board which has a main core on top of it as well I think I think it's a Cypress chip and then the Infineon radar chilled at the bottom there's also this really cute all-in-one it's called like a sensor to go board that has the SPI and GPIO pins brought out and also the sensitivity and threshold timing just like a PR sensor is configurable with two many tracks and you can see the sonar on the right you need to sort of see the that sonar the radar on the right you can even see the antenna this is the pinout if you want to integrate this it does come on a pick-and-place reel you can build but if you don't want to do the layout I did check out an ultra librarian which is linked to from digikey has the pinout and pad definition so you can just download it directly into your CAD program on there's actually two places on github so there's a radar this is the shield that just has the GPIO pins this is a very simplified library that only does like the GPIO there's also a separate library file for SPI mode if you're interested in the SPI mode you know there's example code you'll have to do the hardware abstraction layer but you can set all the little tweaks and knobs you want to customize the GPIO and of course you can still have IRQ output if you want to be told you know when the sensor is triggered but again I think that you know it has this built-in simple mode you can start with that and then if that doesn't work for you upgrade to using SPI control available on digikey there was like four thousand there's four thousand there's a lot yeah so we're going to do two things they have a cool video we're going to play that and then we're going to bounce out of IMPI and we're going to show because we're testing out microscope stuff so we didn't want to have this as part of IMPI so we're going to just do that really quick so see you on the other side hi I'm Arushi Jain and as a radar system application engineer I often get told that radar is too complex we've been listening so let's move away from complexity and go towards simplicity this is our BGT60 LTR11 shield in the center here is the 60 LTR11 MMIC with the antennas integrated in the package already this reduces complexity to design antennas at the user end it's a really small package with an extremely low power consumption it supports different modes of operation including a completely autonomous mode without requiring any MCU or any signal processing now isn't that simple so let me show you how this works all you need is a battery connection and connect the power supply here you see the LED start detecting me already the green one is for motion detection whereas the red one is for direction detection as I move my hand towards and away you see the red one starts blinking and stopping when it is blinking it means I'm coming towards it and when it stops that means I'm going away the radar also works through different materials as you see I have it covered here with a plexiglass and it still detects my hand movement it's a Doppler based motion radar sensor it detects a human target up to five meter range and is also less than five milliwatt in public consumption