Questions tagged [eeprom]

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

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47 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 ...
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3answers
946 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 ...
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9answers
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 ...
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1answer
41 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://...
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1answer
61 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?
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67 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 ...
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1answer
130 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 ...
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2answers
104 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 - ...
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1answer
88 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 ...
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1answer
88 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 ...
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3answers
99 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, ...
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1answer
37 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 ...
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1answer
70 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 ...
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3answers
984 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 ...
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1answer
134 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 ...
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1answer
135 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 ...
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1answer
46 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 ...
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3answers
139 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 ...
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1answer
59 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 ...
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2answers
624 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: ...
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2answers
69 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 ...
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0answers
68 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 ...
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1answer
73 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?
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37 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 ...
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3answers
375 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 ...
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1answer
61 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 ...
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1answer
59 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 ...
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2answers
87 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 ...
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3answers
301 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 ...
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2answers
37 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 ...
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1answer
75 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 ...
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1answer
114 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/...
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1answer
123 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 ...
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1answer
130 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 ...
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2answers
35 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 ...
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2answers
553 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 ...
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1answer
191 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 ...
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5answers
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 ...
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2answers
396 views

STM32 - Reading EEPROM via I2C Delay Problem

Im trying to read/write EEPROM byte by byte but if i dont put an enough delay(~1ms) between read/write tasks, im getting or writing wrong value to the EEPROM. But this delay is taking a significant ...
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1answer
44 views

Using EEPROM for transceiver data communication in Tx and Rx mode?

I am planning to use EEPROM (ST-M95640-DF) in between Transceiver IC (ST-S2LP) and the MCU (STM32L152RE). I would put program commands in a read-only section of the EEPROM to be accessed easily. Now ...
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0answers
92 views

24lc256 EEPROM page writing problem

I have a question about my EEPROM Project recently started. why there is a maximum of 16-byte is Writing into EEPROM in below code. when we able to writing 64byte into the single page using page write ...
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1answer
42 views

Can i Increase the NFC range upto 50cm by making a bigger antenna? i only want to write data into a NFC enabled EEPROM?

As NFC are active upto 15cm range, i/m using a PN532 to write data into a NXP NFC enabled EEprom, which is successful, i want to increase its range by 2X by increasing the Power or size of Antenna for ...
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0answers
107 views

How to programming chip with TL866 even if not in the supported list of TL866 device?

I work at a textile company. We have a sensor header which is named USTER. The Uster device checks the yarn quality. If it detects any problem it cuts the yarn. In our company, we have 8x60=480 Uster ...
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2answers
85 views

Why is my EEPROM not working?

I have a 24FC01, 1 kbit EEPROM on my board. The SDA and SCL lines are pulled up to 3.3V through two 2k resistors. I'm using a STM32F407 MCU to read and write data to the EEPROM. Using the HAL ...
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4answers
122 views

Flash or EEPROM

EEPROM vs SD Flash I am working on a Arduino program (a game, a slot machine) that needs to store 16 bitmaps (the slot machine symbols) that are 32 * 16 bytes each (total 8192 bytes). The bitmaps are ...
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1answer
57 views

What is the internal i2c address to CAT24AA16-D

I am interested in using this eeprom for a project. I have used used I2C devices before and usually the datasheet gave the embedded address somewhere. For the life of me I can't seem to find it on ...
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1answer
38 views

How can i find the AT24C256 reg_addr?

For i2c to eeprom (at24c256) how can I find the device address and register address? ...
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1answer
53 views

IC replacement 24LC16B-I/P

I apologize for my ignorance, but does a brand new IC need to be programmed or are they already factory programmed ready to be solder? I have an M-Audio 49 MIDI controller piano with a bad 24LC16B-I/P ...
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0answers
102 views

Can I safely erase the EEPROM on my ATmega2560 by flashing a hex file where every byte is 0xFF?

I am updating the firmware on my 3D printer from Sailfish to Marlin and my chip is not responding to the erase command on my ATmega2560; but I am able to flash it: ...
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2answers
716 views

How Many EEPROM Write Cycles Left in My EEPROM

I ordered some AT28C256 EEPROMs, but none of them were cleared, they all have some garbage programmed, probably from the last user. Obviously they're supposed to be clean and new. I wanted to ask, is ...

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