{"product_id":"8mb-psram-chip-for-teensy-4-1","title":"8MB PSRAM chip for Teensy 4.1","description":"\u003cp\u003eThis PSRAM chip can add 8 Megabytes of RAM for use on \u003ca href=\"\/en-eu\/products\/teensy-4-1\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eTeensy 4.1\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eOne PSRAM Chip for 8 MB Memory\u003c\/h2\u003e\n\u003cp\u003eThe PSRAM chip is meant to be soldered to the smaller pads on the bottom side of Teensy 4.1, underneath the SD card socket, between pins 31-32 and 33-34. Do not use the larger pads. A single PSRAM chip must be solded to the smaller pads to be detected.\u003c\/p\u003e\n\u003ch2\u003eTwo PSRAM Chips for 16 MB Memory\u003c\/h2\u003e\n\u003cp\u003eIf 8 MB isn't enough, you can solder 2 PSRAM chips for a total of 16 MB.\u003c\/p\u003e\n\u003ch2\u003eMemory Test Program\u003c\/h2\u003e\n\u003cp\u003eAfter soldering the PSRAM to your Teensy 4.1, run this \u003ca href=\"https:\/\/github.com\/PaulStoffregen\/teensy41_psram_memtest\/blob\/master\/teensy41_psram_memtest.ino\" target=\"_blank\" rel=\"noopener noreferrer\"\u003ememory test program\u003c\/a\u003e to verify the PSRAM memory really is working properly.\u003c\/p\u003e\n\u003ch2\u003eDocumentation\u003c\/h2\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0174\/1800\/files\/APM_PSRAM_QSPI_APS6404L_3SQR_v2_3_PKG-1954826.pdf?v=1637249506\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eClick here\u003c\/a\u003e for the datasheet for this chip\u003c\/p\u003e\n\u003ch2\u003eUsing PSRAM Memory\u003c\/h2\u003e\n\u003cp\u003eTo use PSRAM memory in Arduino, add \u003cstrong\u003eEXTMEM\u003c\/strong\u003e to large arrays or other variables you wish to be allocated in the PSRAM. These variables are not initialized and will contain random data when your program starts, so don't forget to set them to zero or fill them with the data you need before use.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0174\/1800\/files\/teensy41_memory4_480x480.png?v=1591715004\" alt=\"\"\u003e\u003c\/p\u003e","brand":"Generic","offers":[{"title":"Default Title","offer_id":31903249989715,"sku":"COM0218","price":3.95,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0174\/1800\/products\/SOP_8_CAT.jpg?v=1637249706","url":"https:\/\/shop.pimoroni.com\/en-eu\/products\/8mb-psram-chip-for-teensy-4-1","provider":"Pimoroni Ltd","version":"1.0","type":"link"}