Questions tagged [eeprom]

Acronym: Electrically Erasable, Programmable Read-Only Memory. Sometimes used with Flash parts that are similar to old EEPROM parts.

Filter by
Sorted by
Tagged with
0 votes
0 answers
35 views

Strange behaviour AT28C64B

I recently got a bunch of AT2864B EEPROMs that I am using to make multiplexer for a display. I've hooked up all values correctly and looked through my code countless times without any trace of such ...
user avatar
0 votes
0 answers
16 views

EEPROM Emulation utility fails during "PageTransfer" function (XCUBE-EEPROM V3.0.0 and 4.0.0) on STM32G474 MCU

I have incorporated the EEPROM emulation utility in a project based on STM32G474CE MCU. So far the read/write functionality works fine. The problem comes when a page is full and the pag transfer ...
user avatar
0 votes
1 answer
74 views

MC24C08 EEPROM Write Cycles

What is the MC24C08 maximum write cycle count for a given bit or for a given byte? It doesn't say so on the datasheet, and I get conflicting answers when I look up this question for other EEPROMs (...
user avatar
  • 47
1 vote
0 answers
35 views

FT232R custom eeprom - D2XX

trying to figure out how to read full EEPROM dump and flash it back without using any templates, M Prog and FT Prog. Need a way to utilize extra space on eeprom for authenticating cables. Basically ...
user avatar
1 vote
2 answers
77 views

Non volatile memory on simple hardware board [duplicate]

I'm designing a low frequency board with some analog signals inputs and a few discrete logic gates which drive warning LEDs. I want to save the status of the LED even if the board is powered off. No ...
user avatar
  • 33
2 votes
0 answers
60 views

FLASH memory corruption

I have a stm32f030c8t6 which I wish to save some data in its FLASH memory. I use Address Page30 which is 0x08007800 in memory map. it is in 7th Sector. I've developed my code and easily saved some ...
user avatar
2 votes
2 answers
68 views

How to know if an EEPROM IC can interface via Octospi?

I just learned that Octospi can NOT be configured to be used as a standard SPI device as Octospi was designed to be used to interface with external memory devices. The thing is, EEPROM ICs don't seem ...
user avatar
1 vote
2 answers
73 views

Can I improve EEPROM lifetime by not changing individual bits?

In my current project I need to store (among other things) the current elapsed time in hours to retrieve it in case of power loss. Since I am using a Arduino Nano I would ideally like to use the built ...
user avatar
1 vote
1 answer
74 views

EEPROM usage in ZS-042

I have bought a realtime clock module (this one). According to the sparse data I found there is a EEPROM on it. It's called 24C32 as can be seen on this schematic I found: As I want to rebuild this ...
user avatar
4 votes
3 answers
373 views

EEPROM with GPIO [closed]

Trying for a while now, but I cannot find an EEPROM memory with some address bit mapped to a GPIO. Or from a different angle, a GPIO expander with an EEPROM memory to save the config. Do such devices ...
user avatar
2 votes
1 answer
333 views

STM32 - EEProm emulation example - how to determine / automatically assign start address without conflict

I am not sure, if I missed some information the documents I read, but I struggle with the following issue. I want to implement an emulated EEPROM in my software for an STM32F103 (physically a ...
user avatar
  • 1,710
0 votes
0 answers
56 views

SPI Bit bang to enable/read/write EEPROM from TM4C123GXL

I have checked a few bit bang posts here but still couldn't figure it out. The datasheet of the EEPROM is at: Datasheet of FT93C66A I tried to interface with SPI but to no avail, so I decided to use ...
user avatar
1 vote
0 answers
51 views

Is it possible to modify 8-pin Christmas tree LED controller's functions?

Intro I have an 8-function artificial Christmas tree. The 2-wire LEDs have eight different lighting settings. The control box of the tree has a pushbutton that I can depress to cycle through the ...
user avatar
6 votes
3 answers
965 views

Does an EEPROM consume power only during the transition edges or during entire read/write cycle?

Iam trying to simulate the loading behavior of an EEPROM. It is powered by a 5V LDO. When would the EEPROM actually consume power? Does it consume power during the entire read/write cycle time? As ...
user avatar
  • 2,155
11 votes
9 answers
5k views

Best way to store very small amount of data?

I'm building a side project at the moment and I want to be able to store and retrieve a very small amount of data (10 kB tops). If the power is disconnected I want to be able to retain the data. I ...
user avatar
1 vote
1 answer
77 views

EEPROM in battery management system

I am designing a battery management system. I am however unable to comprehend the way in which EEPROM can be accessed to feed OCD (Over Current Delay) values. I have attached the datasheet: https://...
user avatar
  • 170
0 votes
1 answer
67 views

Page write method EEPROM is overwriting after 16 bytes [closed]

I am using an M24C04-R EEPROM. I am trying to do write page and read page of structure values, but it's overwriting the values after 16 bytes. uC is Renesas RX24T. Can anyone explain why?
user avatar
0 votes
1 answer
71 views

Why SBC contain EEPROM?

I have nanopc t2 SBC, its software is open source. However, it has an EEPROM. Why? Do they put some confidential information on it? What if I plan to redesign that board, will I need the contents of ...
user avatar
0 votes
1 answer
457 views

Help with reading and programming 93c56 EEPROM [closed]

I need some advice on software and hardware. I would like to read and program the 93c56 EEPROM chip. The chip is removed from the device. I would like to read the content of the EEPROM and compare it ...
user avatar
0 votes
2 answers
132 views

Microcontroller and Memory size allocation

Below are two custom made microcontrollers. The only difference between this is memory size. My question: Can someone tell me what is their start address and end address? Like, for the first one - ...
user avatar
  • 2,450
0 votes
1 answer
103 views

Use FPGA to program external memory? [closed]

For a project, I am going to use an FPGA to process an incoming data stream and convert it into binary code that a microcontroller runs. My current idea is to store the processed data on an EEPROM ...
user avatar
2 votes
1 answer
96 views

Converting 21 inputs into 8 inputs for EEPROM address pins

I am just diving into the world of multiplexers, so my knowledge of them is not the greatest. I am trying to develop a circuit that can control 10 RGB LEDS (30 total LEDs) via 2 inputs per LED and one ...
user avatar
0 votes
3 answers
189 views

Microcontroller- Run program directly off external EEPROM

I am working on a project, and for it I need to run a microcontroller program off of an EEPROM. I know I can set it up with an Arduino to load the program into internal memory and run it from there, ...
user avatar
-1 votes
1 answer
38 views

Can I use a CAT28LV64 at 5V?

I'm trying to find good EEPROM/Flash memory that I'm able to use on a breadboard for preferably cheaper than $12. I came across the CAT28LV64 and noticed that it fits very well with my needs. The only ...
user avatar
0 votes
1 answer
94 views

EEPROM memory erase bit vs word

If I have an EEPROM 1K X 16, can I erase bit by bit or just word by word (2 bytes/16 bits) in my matrix of registers ? In digital systems - TOCCI, the EEPROM is modeled by a matrix of registers, each ...
user avatar
  • 119
4 votes
3 answers
1k views

Will a blocking diode in series with pull-up resistors negatively affect the I2C bus?

I'm using an I2C EEPROM IC in a project to store configuration and settings for a Teensy Microcontroller, and I'm currently trying to work out how to achieve reprogramming of the settings. I plan on ...
user avatar
  • 77
2 votes
1 answer
156 views

Assembling a .hex file for EEPROM using ASM68K.exe

I know this is a long shot but my college is closed at the moment so i’ll ask here for now. For my senior lab we are asked to program a 28C16A EEPROM. What is expected to go on this EEPROM is ...
user avatar
  • 155
1 vote
1 answer
144 views

What is the name of this component that is responsible for powering the boot ROM?

I have a circuit board that doesn't boot up. After probing the VCC pin of the BOOT ROM, I found out it wasn't getting enough power on 3.3V, but only got 0.850V. I traced that pin back to the ...
user avatar
  • 153
0 votes
1 answer
54 views

ATtiny85 - Working with EEPROM in IDLE mode

I am working with the ATtiny85 board. I am working with data EEPROM and sleep modes of EEPROM. I have the following questions Can we write data into Data EEPROM of ATtiny85 when the device is in IDLE ...
user avatar
  • 5
5 votes
3 answers
197 views

How do I edit the EEPROM of a K30 CO2 sensor?

EDIT - Corrected code is at the bottom of the OP. Background While working on a circuit to log carbon dioxide with a K30 CO2 sensor using an Adafruit Data Logging Shield, I ran into a problem. The ...
user avatar
  • 155
1 vote
1 answer
87 views

Write EEPROM while flashing firmware in MCU

am using a STM32L0x2 device, Arm Cortex M0 core. My goal it's to flash a default value in a EEPROM page during the firmware's flash. Long story short: I want that when flashing the .elf in the MCU (I ...
user avatar
  • 13
7 votes
2 answers
662 views

Sequential EEPROM writing

I am using an M24C64 EEPROM with an STM32F4, but I have a problem with sequential writing. When I try to write 16-bit data sequentially like this, I get HAL_I2C_ERROR_AF error: ...
user avatar
  • 283
1 vote
2 answers
120 views

PIC18 preserving EEPROM data during reprogramming

I am using PIC18f4550 microcontroller to store some data in EEPROM so that the data can be accessible after the power reset. When I reprogram the PIC with PICkit3, it seems to wipe out the EEPROM data ...
user avatar
1 vote
0 answers
101 views

Writing an Array to EEPROM Problem

When I write an array to EEPROM and read it I always get 0xFF. I am writing in addres 0x0001 to 0x0005. The password I am entering is 1,1,1,1,1 saved in uint8 array ...
user avatar
1 vote
1 answer
103 views

Help identify 8-pin SOIC chip with markings 1734 6M 2W4

I came across this chip, which is used for resetting toner page count. Could anyone identify its type?
user avatar
  • 53
0 votes
0 answers
40 views

Help identifying this chip

Can anyone identify this chip? It came out of a central locking kit fitted to my car. But I didn't get the keyfob with it. From what I can tell it's a Fairchild semiconductor. With the writing on the ...
user avatar
1 vote
3 answers
556 views

Tool for editing EEPROM single hex byte

I need to modify a byte of the Hex data block coming from an EEPROM and write it back to the EEPROM. Now the problem is if I simply do that, the CRC changes. Is there any tool in Linux for manually ...
user avatar
0 votes
1 answer
64 views

How to control 12 V with Arduino's 5 V pins?

I'm trying to program a parallel EEPROM which requires Vpp high voltage cycle to write a byte. I want to control Vpp with an Arduino pin so I can write a byte onto an address in EEPROM. But I couldn't ...
user avatar
3 votes
1 answer
78 views

Programming audio to a voice ROM

I own an arcade crane machine that stores its music on a API840N sound chip and i'd like to change the music that the machine plays, I've taken a look at the data sheet but it doesn't go into detail ...
user avatar
  • 167
0 votes
2 answers
143 views

STM32F0 internal EEPROM pages

I use stm32f030 and I use st eeprom emulation library. I want to know how many variables I can save in eeprom? I have 48 variables and in this case, I have to create 48 pages? Is it possible to save ...
user avatar
  • 37
1 vote
3 answers
478 views

STM32F0 internal EEPROM read and write limit for a variable

I use st eeprom emulation library to save my variables. I want to increase the variable when I push the button and save it to eeprom. It works good until 256 but after 256, microcontroller stop ...
user avatar
  • 37
1 vote
2 answers
48 views

AT28C256 Page Mode Write Waveforms in datasheet

I read the datasheet for the AT28C256 EEPROM and in the page mode write section there is the following diagram. Where \$ \overline{OE} \$ line is always in the HIGH state during operations whereas in ...
user avatar
  • 115
0 votes
1 answer
81 views

Arduino based EEPROM programmer acts weird

I use an Arduino Mega to program an AT28C256 by using this code [1], but there is a weird issue! The Arduino's pin 41 is connected to the AT28C256's pin 16 which is I/O 4. It works without any problem ...
user avatar
  • 153
0 votes
1 answer
155 views

Help identifying I2C EEPROM - top marking H250 2GB 2

I have a Fujitsu server (PRIMERGY RX300 S8) with a failed I2C EEPROM on the front panel PCB. I would like to order the correct replacement components, but I am unable to identify the exact series/...
user avatar
1 vote
1 answer
201 views

Programming a AT28C64B EEPROM using an STM32F429

EDIT: For those who tried to help or have found this question via google, I managed to solve this issue just by adding a 1uF ceramic bypass capacitor to the breadboard. Thanks for the answers. I'm ...
user avatar
  • 11
1 vote
1 answer
205 views

Programming Amiga Kickstart with TL866CS

I wanted to burn Kickstart 3.1.4 to AM27C400 using TL866CS programmer, in theory it is supported, but when looking into list of ICs in MiniPro software I get AM27C4096 @DIP40, apologies for daft ...
user avatar
0 votes
2 answers
39 views

Programming I2C devices with NV EEPROM

Some I²C devices like the MCP4728 DAC have a small EEPROM allow programming the I²C address (and other configuration bits). I know that in high volume can be programmed by the vendor, but for low ...
user avatar
  • 874
1 vote
2 answers
932 views

SPD I2c Address for DDR4 SODIMM

While designing DDR4 SODDIM schematic for a mini-pc motherboard, I understood that I need to set an address to Serial Presence Detect (SPD) EEPROM so the CPU can identify the memory. While looking at ...
user avatar
  • 583
1 vote
1 answer
272 views

STM32F0 EEPROM read problem with several variables

I use st eeprom library to save my variables. When I save a single variable, I do not have any problem. I can save it, refresh it and after disconnecting the power, I can read that variable. Now I ...
user avatar
  • 37
7 votes
5 answers
1k views

EEPROM Fatigue - Does it affect only the cells being written excessively, or will it cause global failures?

We have an EEPROM with a 10,000 cycle life duration - Our application may write more than 10,000 times. If we write to the same location over & over, is it only that single location that ...
user avatar
  • 3,916

1
2 3 4 5
8