8MB PSRAM chip for Teensy 4.1

This PSRAM chip offers an extra 8 Megabytes of RAM for your Teensy 4.1. It's a great way to boost memory. For 8 MB memory, use one PSRAM chip. Simply solder it to the smaller pads on the bottom of Teensy 4.1, under the SD card socket, between pins 31 - 32 and 33 - 34. Avoid the larger pads. If 8 MB isn't sufficient, solder two chips for a total of 16 MB. After soldering, run a memory test program to ensure it works well. Click here for the chip's datasheet. In Arduino, add EXTMEM to large arrays or other variables to use the PSRAM memory. Remember, these variables start with random data, so set them to zero or fill with needed data before use.

Using this PSRAM chip is easy. First, decide if you need 8 MB or 16 MB of extra memory. For 8 MB, solder one chip to the smaller pads on the bottom of your Teensy 4.1. For 16 MB, solder two chips. Make sure to use the smaller pads between the specified pins and not the larger ones. After soldering, run the memory test program to check if it's working. When using it in Arduino, add EXTMEM to the variables you want to allocate in the PSRAM. Since these variables start with random data, always set them to zero or fill them with the data you need before using them. There's no special maintenance required, but be careful when handling the chip to avoid damage.