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If I am understanding your setup correctly, it sounds like the I2C is connected via an external cable as shown in your pic so the I2C not coming from the Teensy but rather an external device?

If...

You want to cut the small trace that is between the two large pads to isolate the USB power from the VIN power.

Use a sharp X-acto or box knife with a new blade. Angle the blade at about a 45...

Under normal circumstances, the CPU should not be getting that hot. It would normally just be warm to the touch.

If you are plugging both USB and VIN power in at the same time, besides the diode...

As Defragster has pointed out, I have some of the Teensy 4.1 in stock, though I am a little surprised he can see my website at all. ;)

Most of the ones I sell are the value-added 'Fully Loaded...

It is the 4th pin down. It goes GND, 0, 1, 2

There is a small trace connecting those pads which can be hard to see and that is what you want to cut to separate VIN and VUSB power.

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Communicating over a serial port doesn't mean you need to use AT commands with the ESP32. You can write whatever program you want to run on the ESP32 and use the serial port to pass information back...

The LED effect you are seeing is because the active inputs to the unpowered chip are leaking current through the chips input protection diodes and thus putting a little voltage/current on the power...

You might want to verify that the OE pin on the TXS0108E is pulled high to enable the part. Looks like it could be reading floating bits.

You can use the same SPI bus for both. As Defragster mentioned, only the CS needs to be unique between them so they don't conflict when they share the same bus.


Correct


Correct. You don't...

Your scheme would work if you can find the pins, though I think the soldering might be difficult. Something like these pins with removeable carrier if found in shorter length or trimmed to length...

Don't know if you are still messing with this, but it looks like your R- pin solder did not flow correctly.

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That trace just feeds 3.3V to the optional 25K potentiometer. Since it appears you are not using that part, cutting the trace won't affect your setup. If it is a solder bridge, you should also be...

Probably a long-shot, but take a closer look at the area I have circled in red. That small trace running between the GND pin and Pin 0 is connected to 3.3V. Perhaps the solder resist is getting...

The MOSFET SP8M21FRA seems like it should work OK at 3.3V. If you have 5V available and drive it with something like a 74HCT125 between the Teensy and the MOSFET, it will help to ensure Rds(on) is...

Your symptoms sound like a thermal issue to me. The only real difference between a short power cycle which doesn't fix the issue and a long one which does, is that the components have time to cool...

I think he saw that it is flagged as not recommended for new designs which is different than going EOL.

mjs513, the datasheet I linked to from LCSC site is Rev 0.7 and shows 144MHz max data rate. There is an older datasheet I have come across that showed 100MHz, so I think they updated it at some...

I'd be happy to send some to Paul if he would like to test them himself and add them to his approved alternate list. Not sure if there is a more strenuous test than the standard memtest that can be...

I have seen the LY68L6400S mentioned before, but found no confirmation if they were in fact a valid alternate so I brought some in to test since chip shortages are going to be around for awhile.
...

I had the parts to duplicate your basic setup with the LCD on Port1. It worked as expected, so I suspect there must be a wiring issue somewhere as others have mentioned.

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--- Ken

I can confirm that the I2C to parallel adapter boards on the back of these LCDs do include pull-ups on the SDA and SCL lines.

I might be able to help you out. I sell the Teensy 4.1 as a fully populated board including the extra PSRAM and Flash memory chips, Ethernet header and pins.

I thought about also adding a...

I'm with KurtE on this.

1. Go after the very low hanging fruit first like cleaning up the navigation in the menus and adding links on product pages to make it easier to find the other info that...

As BriComp already mentioned, I'm not currently setup to ship internationally but I have customers in Europe and the Middle East that use freight forwarding services and those seem to work fairly...

Thanks for the order. 64MB Flash and shorty headers as well as the taller Ethernet headers Paul pointed to are inbound.

If you'd like I can hold the order until the chips come in so you don't...

I'll go ahead and source some of the W25Q512JVEIQ to have on-hand by next week in case anyone needs them. Will also get the shorty headers inbound.

Good idea on the memory layout, I will add that...

That is the line I was looking at. I think they are the way to go because you can easily cut the female connectors. They are also a little shorter than the normal shorty headers. I currently sell...

Good idea on the low profile headers. Also will look at sourcing short male headers to go with.

The Mega 2560 Pro MCU board is designed specifically for the Mega 2560 Pro module and only works...

Thanks Phil, your order will go out Monday.

Funny you mentioned the Blue Pill. I have a stack sitting here on my desk. I was going to productize them and offer them assembled with the Arduino...

My premise is that Teensy should really be more pervasive in the mainstream hobby than it is. Putting the most power in the smallest package provides great performance but also tends to create some...

Hi everyone

My name is Ken Hahn, and I would like to introduce myself and my company ProtoSupplies.com as another option for buying Teensy products and related accessories. We are an official...