SMD marking 2L805 - SPI eeprom? - Page 1
Forum section: electronics / repair

author: deanclaxton
author_rank: Regular Contributor
timestamp: March 19, 2023, 12:17:51 am
content: I have a part on a board which I suspect is a SPI eeprom, however I havent been able to find a datasheet. Its an 8 pin package marked as2L5082L805 and I believe it has WP on pin 3 ("WP"" is marked on the sikscreen on a test pad wired to this pin so that is a pretty good hint!).The chip is storing EDID information on a laptop LCD panel and I'd like to update the contents but need to firstly confirm the model to check that my programmer supports it. I''ll possibly have to remove it from the board to program it. I believe that only the clock and MISO are connected through to the laptop - thus when attempting to reprogram it using from the computer, the information is not stored as MOSI is not wired outside of the panel (there is a test pad on the board for this pin that they likely use to program it in the factory).Any thoughts what it might be? I was thinking perhaps 25L080 but that is a lot larger than necessary for EDID. 25L010? That will be my first try if I cant identify it before I try program it.

author: fzabkar
author_rank: Super Contributor
timestamp: March 19, 2023, 12:38:46 am
content: Are you sure that's "2L508" and not "25L08" or "25L080"? BTW, I thought EDID chips were microwire, not SPI. :-?

author: deanclaxton
author_rank: Regular Contributor
timestamp: March 19, 2023, 12:42:42 am
content: Its definitely marked as 2L508, with WP on pin 3. I think it's SPI but not 100% sure.

author: fzabkar
author_rank: Super Contributor
timestamp: March 19, 2023, 12:45:34 am
content: Quote from: deanclaxton on March 19, 2023, 12:42:42 amPerhaps only those EDID EEPROMs which are accessible via a monitor's external port require i2c?

author: deanclaxton
author_rank: Regular Contributor
timestamp: March 19, 2023, 12:56:22 am
content: I initially thought it was I2C, but they all seem to have WP on pin 7. I might just have to take it off, solder it to a board and give it a shot.

author: DavidAlfa
author_rank: Super Contributor
timestamp: March 19, 2023, 02:04:07 am
content: Really? No picture?

author: deanclaxton
author_rank: Regular Contributor
timestamp: March 19, 2023, 04:06:16 am
content: I managed to take a photo from my phone with a backlight to light the SMD code. Silkscreen would also indicate that this is a SPI device. I suppose I was just hoping to identify the device before I randomly try program it, but it does seem to be a 25L0x series device from the pinout. Resistors are 0402, cap must be 0201. Its quite a small package.

author: fzabkar
author_rank: Super Contributor
timestamp: March 19, 2023, 04:26:19 am
content: It's "2L805", not "2L508".

author: deanclaxton
author_rank: Regular Contributor
timestamp: March 19, 2023, 04:34:53 am
content: Sorry - I knew that and somehow typed the wrong code without realising I had. 2L805 yes. I havent been able to find what it is.

author: fzabkar
author_rank: Super Contributor
timestamp: March 19, 2023, 04:41:09 am
content: FWIW, I have these SPI flash chips in my SSD/HDD database:W25X20CLUXIG, Winbond, 2.5/3/3.3V 2M-BIT SERIAL FLASH MEMORY WITH 4KB SECTORS AND DUAL I/O SPI, marking 2Hxxx & 0Gxxxx, USON 2x3-8:http://chip.tomsk.ru/chip/chipfile0-x.nsf/all/49D18EA25FB19D5A4725822D00642029/$File/w25x05cl_10cl_20cl%20revc_c03_20120801.pdfhttp://chip.tomsk.ru/chip/chipfile0-x.nsf/all/4B70D1CEE983C2614725822D00642E89/$File/w25x20cl_revf%2020150806.pdfW25Q80EWUXIE, Winbond, 1.8V 8M-BIT SERIAL FLASH MEMORY WITH DUAL/QUAD SPI & QPI, marking 8Lxxx & 0Exxxx, USON 2x3-8:http://chip.tomsk.ru/chip/chipfile0-x.nsf/all/FA65C5CB65A1BD864725822D00641FEF/$File/w25q80ew%20revi%2008222017%20sfdp.pdfTherefore, I feel confident that you have a 2Mbit Winbond SPI flash in a USON 2x3-8 package, probably 1.8V.I found it:W25Q20EWUXIE, Winbond, 1.8V, 2M-BIT, SERIAL FLASH MEMORY WITH 4KB SECTORS, DUAL AND QUAD SPI, marking 2Lyww + 0Exxxx, USON-8:https://www.winbond.com/resource-files/w25q20ew_revi%2008222017%20sfdp.pdf

author: deanclaxton
author_rank: Regular Contributor
timestamp: March 19, 2023, 04:48:18 am
content: ThanksI will see if I can wire it to my programmer and try reading it - perhaps using the test points else mounting it on an adapter.

author: deanclaxton
author_rank: Regular Contributor
timestamp: March 19, 2023, 05:00:44 am
content: Looks like Microchip to a 25XX010A that is available in a 2 x 3 TDFN and of more likely capacity of 1Kbits - could be a clone of that too I suppose.

author: fzabkar
author_rank: Super Contributor
timestamp: March 19, 2023, 05:03:50 am
content: ISTM that there must be a reason that the designer used a 2Mbit part. Perhaps it stores some firmware, not just EDID? Anyway, a dump will tell.

author: deanclaxton
author_rank: Regular Contributor
timestamp: March 19, 2023, 05:44:07 am
content: Oh - I see - yes that must be the part (W25Q20EWUXIE) - great find! The second line on the chip is 0E41A7 so that perfectly matches the W25Q20EWUXIE.Thank you for your help with this

author: amyk
author_rank: Super Contributor
timestamp: March 19, 2023, 05:59:02 am
content: Quote from: fzabkar on March 19, 2023, 05:03:50 amYes, 256KB is ridiculous for just EDID. Might contain firmware for the OSD MCU too.