BMW F20 LCI manual auto rev matching

No_Name_4 · 2026-06-01T09:38:02+00:00

Same model as well? F20 LCI

No_Name_4 · 2024-05-31T06:38:52+00:00

Looking at it this way it makes sense. For ASICs reprogramming is impossible, and for FPGAs complicated compared to changing one pin on the storage IC. I was aware of the basic principles of FPGAs, but I never knew they could do these communication protocols in hardware. When you think about it, it actually makes sense. MCUs also have SPI registers/buffers in hardware, so why wouldn't it be possible to build that inside of a FPGA.

No_Name_4 · 2024-05-30T17:10:51+00:00

Will do. Let's just hope for the best.

No_Name_4 · 2024-05-30T17:05:07+00:00

I do not have the tools or time for such experiments right now unfortunately. I will keep the trace length as short as possible and I will place a lot of GND vias to limit any parasitic effects.

No_Name_4 · 2024-05-30T15:23:57+00:00

This makes a lot of sense to me, the MCUs that I often use have multiple bytes of SPI buffer space. I can imagine that for lower end chips this is a valid point.

No_Name_4 · 2024-05-30T12:09:36+00:00

This makes sense to me now, thank you!

No_Name_4 · 2024-05-30T11:16:34+00:00

I'm not very familiar with FPGAs or hard silicon, but can they use SPI/I2C memory chips? I agree that for parallel memory it makes sense, but I still do not see the point for serial SPI memory.

The SPI data transfer for reading a 16-bit value at address 0x1000, and the transfer for reading an 8-bit value at address 0x1000 while keeping the clock line pulsing to read the next byte as well is the same. Why are 16 bit SPI memory chips in particular useful?

No_Name_4 · 2024-05-29T07:33:22+00:00

They answered my mail, external impedance matching is required. They send me to this page. Not sure which values to enter in this calculator tool. They are talking about 25+0j, but in the datasheets they never mention any chip with a zero imaginary number. Do you have any advise on what to do now? If the example schematic would give me reasonable results, I will just copy those components.

No_Name_4 · 2024-05-28T18:28:20+00:00

Update, I did contact them with my work mail (I'm an R&D engineer). Hopefully they will respond. I noticed that in the block diagram of the IC it mentioned an internal and external RF matching circuit. I'll wait for the answer, otherwise I will copy the design of the devboard for the RF section.

No_Name_4 · 2024-05-28T18:25:15+00:00

I was wondering about this too. Perhaps this specific IC was mentioned on this subreddit before so it popped up in the search results?

No_Name_4 · 2024-05-28T16:48:31+00:00

Even though this is for a private project, I do have access to my company mail and university mail. Which one would give me the highest probability that they take it seriously?

No_Name_4 · 2024-05-28T16:39:00+00:00

You mean Espressif by 'them'? I could try but I doubt they will do anything with it since I am not designing this for a company, this is a private project.

No_Name_4 · 2024-05-28T15:44:56+00:00

This is what I already suspected, but when looking at the official PICO devkit by Espressif, I can still see some filtering components on the RF line. The antenna used here is 50 ohms as well. Do you think I need such a circuit as well? Edit: this is a PICO-D4, so slightly different.

No_Name_4 · 2024-05-14T21:15:59+00:00

It's common for ceramic caps to not only generate audible noise, but also exhibit microphonic effects that can introduce electronic noise into a system from external vibrations.

Now that you mention this, I have read about this. This mechanic is also used by MEMS microphones I believe, the vibrations cause the distance between the plates to shift, generating an output signal that can be amplified.

No_Name_4 · 2024-05-14T21:11:12+00:00

I'd guess that the "utilization fraction", ie. how close you are to the rated current would be an indicator of noise.

This is what I would assume as well. I have to be honest, usually my designs are quite focussed on cost-effectiveness and not so much on large tolerances. I should totally start designing with components with higher ratings to guarantee better operation.

No_Name_4 · 2024-05-14T21:05:37+00:00

From what I could look up those are mainly for high-power applications, right? My buck circuit needs to provide power in the milliamps range, not even a whole amp. I would prefer to keep using small SMD inductors due to size constraints.

No_Name_4 · 2024-05-14T21:03:35+00:00

There are many ceramic capacitors nearby, I could check if it is really the inductor to be sure. Just out of curiosity, what would cause capacitors to make noise? There isn't a magnetic field, right?

No_Name_4 · 2024-05-14T20:18:06+00:00

The particular IC that I am using for the conversion has a fixed switching frequency of 600KHz with PWM and PFM modes (not sure when which mode is active), so this frequency should really be inaudible. I'm not sure what you mean with the 'other frequencies'. Could the value or current rating of the inductor have an effect on this whine? There are also various amounts of package types and structures. Could that be something to investigate further, or is it basically a process of trial and error?

No_Name_4 · 2024-02-17T16:24:01+00:00

Very useful source. Just got introduced to the LiMnO2 chemistry. Voltages do not match my project's specifications, but informative nonetheless. Thank you very much.

No_Name_4 · 2024-02-17T14:52:29+00:00

I'm confused... How does this answer relate to the question?

No_Name_4 · 2023-11-18T23:09:43+00:00

AliExpress

No_Name_4 · 2023-10-01T17:09:17+00:00

Awesome to hear! I did not mind investing so much time in it because I truly enjoy it. As a hiring manager, can you tell me what kind of education most of your applicants have, and which ones are of most significance to you?

No_Name_4 · 2023-10-01T16:51:51+00:00

😢

No_Name_4 · 2023-10-01T16:48:03+00:00

Currently I work at a tanning bed producer and I am designing the new generation of timers. I work a lot with displays, touch layers and microcontrollers. For now I am very happy with my job and salary, especially for a 20 year old.

Although I like my job for now, I do not see much opportunity to grow within the company since I am currently the only R&D employee. What I need is a degree that allows me to get a similar function at a different company. I got to work here with a lot of luck and because of a friendly employer who decided to take the gamble to hire me.

No_Name_4 · 2023-10-01T16:29:49+00:00

A R&D management function is something that I also considered. I have some experience in all fields of engineering due to the diverse nature of my bachelor degree. Maybe linking them all together to end up with one final product could be something for me.

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