 All right, every single legal aid users or powers of engineering to help you find what you need to find online. One of the best places is digikey.com. Lay data, what is the great search this week? Okay, this week's great search is on the topic of LCD drivers. I've never searched for an LCD driver before and I was curious. So can we go to the overhead and I'll just quickly show this off again. So we've got these, this little seven segment LCD I'm driving with GPIO pens and here's some bigger LCDs. And a lot of people when they make a product and you will go with an LCD display. It's a very common, very low cost, very low power user interface device. It's daylight readable. You can add a backlight. Now it's readable at night. But again, very inexpensive, very low cost. You can get custom segments. It's a very, very popular way to add a user interface like, you know, multi-meters have them, calculators have them, stuff around your house is gonna have an LCD. So chances are you're gonna integrate one into your product design if you're an electrical engineer. So let's look at how to find a driver for these bare LCD module where you just get the commons and the segments brought out. So let's go to the computer. And this was fun because I had to do this today because I was curious. So we'll learn what I learned. So the first thing was like, I had no idea what this was called. So I just tried LCD driver. Sometimes the part of the trick is knowing what to find. So it turns out that was actually a pretty good guess because there's display drivers, there's display monitors, but this I think these are like ready to go dev kits and stuff for TFT. So this is like kind of a full thing. Like this is a full TFT driver. These are OLED drivers, but what we really want, and these are modules of course, they do have modules if you don't want to do the work of driving a raw display, this is what most people think of when they think of LCDs, right? And we stock these. These are LCDs that have the backlight and the module and the metal plate and they bring out the pins and it's like the HD77 something, you're ready to go. But these aren't customized, these are dot matrix. So if you want to customize it, you're gonna have to do your own driver. So going back, so back to PMIC display drivers. So what's interesting here is that these are considered PMICs and I kind of see why, they are in a sense sort of power management ICs, but they're also like kind of not. So I'll say that there's a couple of different kinds of products mixed into this category. So the first thing is, this is something that I'm gonna want to use now. So I'm gonna go with active and there's like dip and there's QFN and there's like kind of some ridiculous stuff here. I'm gonna go with non-marketplace products. I just see like the original components and I just want LCD drivers for now because LCD is quite different than OLED or LED or vacuum fluorescent. And I also only want surface mount, I don't want through hole. Okay, so when I got to here, what's interesting is there was a couple different things. So there was a mix, there was like some of these like really large pin devices mixed with some of these like, this is like a 40 XX logic device. So I'll say one thing that was interesting is there was a couple of these like really like ancient devices, but they were like, you know, this was like a 20 volt device. It says copyright 2003, but this was probably originally from like, you know, I don't know the 80s or something. And these are for, you know, old LCD devices where like there was a micro computer but you needed something to help you drive it. And this is not what we want. We want something that will actually do the scanning for us sort of like seven segment LED drivers that I've got the HT16K33s, they do the multiplexing for you. And that's what I want. This is not doing the multiplexing for you. This is assuming that you're gonna like do all the work. So this was a little hard to separate Apple. What I did notice is that first off, there's like different configuration segments. And second, the interface. So this was considered like a BCD interface because like binary coded decimal because there was a driver that was controlling it. So I wanna get rid of the BCD because I don't want that kind. I really just want like I squared C and then like SPI and serial, you know, those are fine. And then when I filtered those out, I was like, okay, you know, now we're getting, now we're getting somewhere. So these are, again, there's a couple different types. There's segments and there's dot matrix. And the one I'm talking about like the dot matrix is of course, you know, 64 by 32 dots, but I want segments because I want like the, you know, seven segment or whatever designs. So what I'm gonna do is I also don't need like 500 segments. I was like, let's do, you know, like if I have a seven segment, let's say heck segment, right? So you have 15 elements per. I was like, I don't really need more than like 148, 150 segments. So let's just limit us because there was definitely like massive, massive chips. I didn't need a massive chip. And so then they actually kind of got very reasonable and the prices weren't too bad either. Like you can see that they're a couple dollars. And then I was like, well, I have a lot of choices here. Looks like Rome has a series. TI has a couple series. This is PLCC, not so interesting to PLCC. I was kind of like, I was gonna get a little spoilt for choice to be honest. So what I decided to do is like, well, first up, let's look for stuff in stock. And then second, I want ones that are I squared C only. So I picked two wire serial, which is like another word for I squared C. I picked serial also in case like it got categorized that way. And I started by price and I actually got a couple options. So on semi has one chip. And a lot of these are, let's see, this is serial. Let me actually look at this one. Let's look at this one, the LC 75. So a lot of these are like general purpose. They can run from three to five volts, which is wonderful. Let's look at the usage. Okay, so this one, you can see the segments in the comments are driven up here. There's an inhibit, there's an oscillator, but this doesn't have I squared C. This actually has like a kind of a three pin serial. So I'm gonna skip that. And then I was like, oh, let's check out this Rome one, which I kind of liked that it had, there's a couple different Rome boards. Looks like they have slightly different sizes or configurations. They have a 48 segment and an 80 segment. So I checked up this one. Hold on, this is like a big data sheet. It's a chunker. Let's see, what are you down with it? And this one was actually really nice. So first off, it comes in a very cute QFN, 24 pin QFN. Also can run three or five volts, which is great. They have two versions, you know, 80 segments and a 48 segments. No oscillator needed has integrated oscillator, no external components, low power consumption. And it's like, I like love this block diagram because it's like power, segment output, ground all the test pins and I squared C. And then inside is a DD RAM. So it has the RAM for you. It has like a blink generator. And it kind of does all the work. And it's very simple. I kind of like the simplicity of this board. And then you just have to figure out in your software, you map, you write to the RAM and they're like, this is the DD RAM. So you have internal RAM that's refreshed for you. You tell it which segments you want on and off by writing to the RAM over I squared C. And it does everything else. It does all that multiplexing, the AC waveforms beautifully. So this is actually an adorable little chip. I kind of like it. And it looks like there's a couple of different modes. You know, if you have a chip that has built in LCD driving great, but it could be that you don't, it could be you're like, I'm stuck with this free scale chip or this NXP chip or this AVR, it doesn't have built in LCD driver. So this would be a really good alternative. So this was my pick for the great search because it's in stock. It's inexpensive. It's I squared C to QFN. It's really simple. Doesn't need any external components. And it looks like it's a very easy chip to use and integrate if you'd like to add LCD interface. So check out the Rome BU-97 series of LCD drivers. I think I might make a STEMI QT board out of this. That can be really handy if you get LCDs. You're like, I want to quickly start it up. Having a breakout would be cool. That's a great search.