The Microchip Technology Inc. 25AA/25LC/ products meet the specification contained in their particular Microchip Data Sheet. The 25LC is a 32K bit Serial Electrically Erasable PROM with memory accessed via a simple Serial Peripheral Interface (SPI&#;) View Datasheet. 25LC datasheet, 25LC pdf, 25LC data sheet, datasheet, data sheet, pdf, Microchip.

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Next post on same subject. The CORE part number is easily identified and has been hi-lited.

Status registers change their state based on various microcontroller conditions. The example below describes how to determine dstasheet typical core part number. Most devices, regardless of the technology family, can be identified by their CORE part number.

Powered by WordPress and plainscape theme. In the main loop it reads that data back out, one byte at a time and prints that byte out the built in serial port. Additional information about this technology family. Serial Peripheral Interface SPI is a synchronous serial data protocol used by Microcontrollers for communicating with one or more peripheral devices quickly over short distances.


Data Sheets

Here we allocate the global variables we will be using later in the program. You must be logged in to post a comment. It’s memory is organized as pages of bytes each. B versions have something to do with the way data are arranged internally.

These parts appeared in the mid to early ‘s and most are still manufactured today. Data registers simply hold bytes. The NV stands for non-volatile. Leave a Reply Click here to cancel reply.

Care shall be taken at the B versions which have a different meaning! These modes control whether data is shifted in and out on the rising or falling edge of the data clock signal, and whether the clock is idle when high or low. They differ from their supply voltages:. This way if our data comes out looking funny later on we can tell it isn’t just the serial port acting up:.


This approach allows you to more easily locate a device number, as many users do not know the manufacturer of the device in which they have interest.

These parts are always in plastic cases because the erasing of the part is done electrically without the need to expose the internal chip to ultraviolet light. We send the 16 bit address to begin writing at in two bytes, Most Significant Bit first. Within the 25LC family, some references are getting obsolete and Microchip suggests to use the A versions instead. They differ from their supply voltages: In most cases, the A version e. This means you have to pay special attention to the datasheet when writing your interface code.

Memory Part 3 Posted on 31 Jan The device is enabled by pulling the Chip Select CS pin low. This function could easily be changed to fill the array with data relevant to your application:. daatasheet

Datasgeet directives are processed before the actual compilation begins. The first step is setting up our pre-processor directives. Opcodes are control commands:. This is accomplished by sending the required command, address and data serially one bit at a time over single pins instead of the multiple pins of a parallel part. Due to the number of device manufacturers, the catagories below are organized by technology family and device pin count.

Interfacing a Serial EEPROM Using SPI

Bug of the day: Instructions are sent as 8 bit operational codes opcodes and are shifted in on the rising edge of the data clock. In the control register each bit sets a different functionality. The images on the bottom right are close-up views of the first three eprom packages. A microcontroller normally has 40 or more pins since the input and output operations occur directly from the chip. These parts must be erased before programming. 25llc320


Mainly two types of serial communication protocols are available: As we deal with rather limited micro-controllers, we will skip the families of EEPROM chips which data are addressed in parallel mode. Each time through the loop we increment the eeprom address to read. In this mode, 8 bits arranged memories require 8 pins from the micro-controller which is too much pins consuming even though the gain in speed is noticeable.

The CORE part number for each device is dataxheet Instead, we will look after chips which data is addressed in serial mode. With an SPI connection there is always one master device usually a microcontroller which darasheet the peripheral devices.

The FRAM is also a non-volatime memory component however it uses ferro-electric magnetic structure to store information. Remember, a core part number usually represents hundreds of actual part numbers due datasyeet different manufacturers, speeds, temperatures, package types and other chip characteristics.

25AA/25LC/25C (ETC) PDF技术资料下载 25AA/25LC/25C 供应信息 IC Datasheet 数据表 (1/24 页)

Note char buffer []. Typically there are three lines common to all the devices. Connect 5V power and 25lf320 from the breadboard to 5V power and ground from the microcontroller.