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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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4
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3answers
934 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 ...
2
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1answer
104 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 ...
0
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1answer
128 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
43 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 ...
5
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3answers
114 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 ...
1
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1answer
54 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 ...
7
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2answers
594 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: ...
0
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2answers
63 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 ...
1
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0answers
59 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 ...
1
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1answer
60 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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0answers
35 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 ...
1
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3answers
192 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 ...
0
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1answer
60 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 ...
3
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1answer
55 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 ...
0
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2answers
70 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 ...
1
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3answers
202 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 ...
1
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2answers
31 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 ...
0
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1answer
63 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 ...
0
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0answers
92 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/...
1
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1answer
93 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 ...
1
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1answer
70 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 ...
0
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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 ...
0
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2answers
299 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 ...
1
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1answer
121 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 ...
7
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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 ...
1
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2answers
318 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 ...
0
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1answer
38 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 ...
0
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0answers
54 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 ...
0
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1answer
37 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 ...
0
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0answers
67 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 ...
0
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2answers
67 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 ...
-1
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4answers
102 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 ...
1
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1answer
50 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 ...
-3
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1answer
34 views

How can i find the AT24C256 reg_addr?

For i2c to eeprom (at24c256) how can I find the device address and register address? ...
0
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1answer
45 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 ...
0
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0answers
82 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: ...
5
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2answers
693 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 ...
1
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1answer
70 views

understanding data semantics and diagram

According to http://www.auto-diagnostics.info/pdf/ford_eectch98.pdf page 10, "The 8361 ROM chip contains 8k bytes of program memory plus 128 bytes of additional RAM." I found two diagrams ...
2
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2answers
91 views

How to store the last counting value in EEPROM in ATmega8 after power failure

I written a program to store the last counting value according to ATmega8 datasheet. but it didn't save the last value. The counter variable went to zero after power failure. Please check the ...
0
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1answer
58 views

AT24C32 as a replace?

i want to make this part of circuit . It uses 24AA32A IC. Can i use AT24C32 instead . im worry about A0, A1 and A2. my question : if i want to use 24C32 , to work exactly like 24AA32 i should not ...
0
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0answers
58 views

How to configure the FlexMemory of NXP Kinetis MKE18F to be used as an EEPROM to store data on System power OFF?

I was trying to configure the Flash module of NXP MKE18F512VLL16 MCU to be used as an EEPROM. I followed the attached application note from NXP(AN5338) "How to use FlexMemory as D-Flash and ...
2
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1answer
164 views

Reading EEPROM memory (Winbond W25M02GV) with FT4222H USB bridge

I would like to read an EEPROM Memory (SPI Flash Winbond) using an FTDI USB/SPI bridge (FT4222H). I developed a c++ application that connects to the FTDI and reads data from the memory(and using the ...
0
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0answers
93 views

Can I use a 16bit memory with an 8 bit processor?

The address bus is typically a double octet wide (i.e. 16-bit), due to practical and economical considerations. This implies a direct address space of only 64 kB on most 8-bit processors This quote ...
4
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2answers
2k views

How can I access more than 15 addresses of data from my 8 bit incomplete computer?

Last year I started researching upon how computers work, so I started making one, at least on paper last month, but I ran into a serious problem that isn't getting a satisfying answer from any article ...
16
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4answers
4k views

Do EEPROMs lose their data over time?

For example 8x8 small image stored on eeprom will get corrupt over time? I've seen somewhere eeproms losing their data over time like vhs tapes.
3
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1answer
376 views

EEPROM only retaining a value for a short duration

Background I have a product that includes an SPI EEPROM connected to a Microcontroller. Address 0 if the EEPROM contains what we call the status word. In production the value of the status word is set ...
0
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1answer
228 views

How does a CRC check work between a microcontroller and EEPROM?

I have communication between an EEPROM and a microprocessor over SPI and I want to take care of data integrity. Could you please confirm my below understanding? I have a data which I want to write in ...
0
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0answers
45 views

EEPROM chip always toggling bit when reading

I have a parallel EEPROM, the AT29C020 (doc: http://pdf.datasheetcatalog.com/datasheet/atmel/DOC0291.PDF) In order to read it I'm using an ATMega8535 as it has enough pins. At first I thought reading ...
4
votes
4answers
816 views

Possible to buy Atmega328p with programmed Flash and EEPROM?

I've recently upgraded my old project that goes to mass production (a pair of thousand pieces, pretty niche). Previously I used DIP atmega328p, which were manually programmed in China. I sent them a ...
0
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1answer
58 views

Problem in editing EEPROM of MLX90614ESF sensor , pic 18f4620 , I2C communication

I want to edit Tomax and Tomin in the EEPROM 0x00h and <...

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