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Microchip’s serial EEPROM ,[object Object]
Introduction ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Microchip  S erial   EEPROM Overview ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Features of Serial EEPROMs ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Endurance ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Serial EEPROM Buses
UNI/O™ EEPROMs:  Single I/O Serial Interface ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Serial EEPROM Products
Common Package Options
Bus Summary
EEPROM Design Tools ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Additional Resource ,[object Object],[object Object],[object Object],[object Object],[object Object],Newark Farnell

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Microchip’s serial EEPROM

Editor's Notes

  1. Welcome to this module on Microchip’s serial EEPROM product line . Non-volatile serial EEPROMs are a key component of many embedded designs. This module is an introduction to serial EEPROM technology, as well as an introduction to Microchip’s product line.
  2. Even though Microchip is now primarily known as a microcontroller company, it has been manufacturing non-volatile memories for over 20 years. Today, Microchip continues this tradition with a complete range of serial EEPROM products. Microchip is also known for having outstanding delivery performance, partly because of the company’s world-class manufacturing capabilities. This is a strict quality system that covers both design and manufacturing. Most of our packaging is done at our own assembly site in Thailand, with the balance done at approved subcontractors. This control over our manufacturing helps us to achieve our excellent quality and delivery performance. Endurance is a key part of Microchip’s EEPROM products. Microchip also have a long history of innovation in our EEPROM product line. It has been the first to market with new features including low voltage operation, small packaging, faster speeds, and application-specific devices.
  3. First, serial EEPROMs have a low pin count – typically 8 pins – and are available in very small packages. There are also have 5- and 6-pin options. Second, EEPROMs can both write and read a byte at a time. This is in contrast to Flash technologies that are typically limited to sector operations. EEPROMs are available in a wide temperature and voltage range. Most Microchip EEPROMs are available in 1.8V options, which is excellent for battery applications. They also work up to 5V and at automotive grade temperatures of 125ºC. EEPROMs also have very low power requirements, with virtually all Microchip devices having a typical standby current of well under 0.1 uA. EEPROMs are also very cost-effective since they are small devices in small packages. Finally, Microchip’s EEPROM products are known for their extremely high endurance.
  4. Endurance is defined as the number of times that one memory location, or bit, can be erased and rewritten before that location fails, or no longer holds the correct information. This is a pretty tight definition; when 1 bit on a memory device fails, the entire device is defined to have failed. Serial EEPROMs are excellent for applications requiring many data changes. Most of Microchip EEPROM products are specified to 1 million erase/write cycles, which is much more than most other non-volatile memory technologies. Two components give Microchip EEPROMs their excellent endurance. First, the products are built using Microchip’s PEEC, or PMOS Electrically Erasable Cell, process technology. This cell was developed specifically to give our products high endurance and reliability. Second, every bit of every device is tested three times in our Triple Test Flow process. This combination of an excellent cell structure and outstanding testing gives Microchip its industry-leading endurance.
  5. Serial EEPROMs have historically come in 3 bus types: I 2 C, Microwire, and SPI. This table looks at some specific features of each bus. I 2 C, developed by Philips, is an abbreviation for Inter-integrated circuit. Microwire was developed by National Semiconductor. SPI, an abbreviation for serial peripheral interface, was developed by Motorola. I 2 C devices are referred to as “2 wires” since there are typically two signal connections between the microcontroller and the memory device. Similarly, Microwire devices are referred to as “3 wires.” Each bus has certain data security features. I 2 C devices have a write protect pin that can prevent writes to the array. Microwire makes use of write enable and disable software commands. SPI also uses these software commands as well as a status register to protect the device. It also has hardware options that can protect portions of the array. The last parameter is the number of signal lines between the EEPROM and the microcontroller. I 2 C devices only have 2 signal lines to the micro: a clock signal and one data signal that carries both incoming and outgoing data. Microwire and SPI devices both require 4 I/Os: independent data in and data out lines as well as a chip select and a clock. So, an advantage of I 2 C is that it only uses two I/O ports on the microcontroller.
  6. Microchip’s UNI/O™ bus gives designers more flexibility when designing applications that require external memory. UNI/O EEPROMs only require one signal line to the microcontroller to carry both clock and data signals, thus creating a method to connect an EEPROM to a micro using only 1 I/O pin. Microcontroller I/O pins are valuable resources. By only requiring one of these pins, UNI/O EEPROMs free up other I/O pins to be used for value-added features. This can increase system value using the same basic design. Or, it might be possible to lower the system cost by moving to a smaller microcontroller. Another advantage of this bus is that these devices are available in very small 3-lead packages: one pin for clock and data and the other two pins for voltage and ground. This can mean a lower system cost and smaller designs. Finally, UNI/O serial EEPROMs have been designed with advanced features such as a STATUS register, advanced write protect options, and page writes. And, these devices have the standard EEPROM advantages that we talked about earlier: 1 million erase/write cycles, 1.8-5.5V operation, extended temperature options, and low power.
  7. Here is the product roadmap. Let’s first look at I 2 C™ products in the left-most column. Note that the available densities are listed along the vertical y-axis. All products in this family start with a ‘24’ prefix. It has a very wide density range – from 128 bits to 1Mbit. The standard family has a maximum bus speed of 1 MHz. Next is the UNI/O™ EEPROM family, which is available in 1 through 16Kbit options. It has a voltage range of 1.8 to 5.5 volts and a maximum speed of 100 kHz. Remember that these new products require only 1 connection to the master. The Microwire family is also available in 1-16kb devices as limited by the Microwire protocol. Although it has a narrower density range, Microwire is faster than I 2 C and UNI/O parts at 3 MHz. Lastly, here is the SPI product family, which also requires 4 I/O pins. Like the I 2 C family, SPI has a very wide density range: from 1 Kb to 1 Mb. But, it also has much faster bus speeds – up to 20 MHz.
  8. This slide shows some of the more common EEPROM packages. The most popular package is the 8-lead SOIC. It has a 5 x 6 mm footprint and can hold up to 512Kbits. The TSSOP and MSOP packages are also popular, and are smaller and thinner than the SOIC. Each can hold up to 256Kbits. The 2x2 mm SC70 package is the smallest option, available in 1 and 2Kbit devices. The 3x3 mm SOT 23 package (in 3, 5 and 6 lead versions) can hold up to 16Kbits. The 2x3 mm TDFN package is also very small and is less than 0.8 mm thick, making it an excellent choice for height-limited applications. It can hold up to 64Kbits.
  9. Let’s compare the 4 buses. Here’s a chart that shows some key features of each protocol: density range, speed, security options, number of microcontroller I/O pins required, and package options. Under the heading for each bus, we’ve ranked that feature with 1 to 3 stars, with 3 stars being the best. As we’ve discussed earlier I2CTM and SPI have the widest choices in density – all the way up to 1 Mb; so both these buses earn 3 stars in the density category. The Microwire and UNI/O™ buses have a comparatively limited density range of 1-16 Kb, so they only get 1 star. Next is speed: SPI has the fastest available bus speed, followed by Microwire. I 2 C and the UNI/O bus are the slowest. Now let’s look at security: The SPI and UNI/O protocols have the widest range of security options, featuring both software and hardware data protection schemes. I 2 C features only hardware write protect. And Microwire has the fewest data protection options. The UNI/O bus is clearly the best in terms of I/O pins used since it only requires one microcontroller pin. I 2 C devices usually require 2 I/Os and Microwire and SPI parts require at least 4. I 2 C, Microwire and the UNI/O bus all score well in the small package category. SPI parts require slightly larger packages in most densities. If speed is the most important factor, SPI or Microwire is the way to go. If speed at high density is most important, Microwire drops out and SPI is the clear choice. I 2 C is the most popular bus, probably because of its wide density range, small packages, and modest I/O requirements. And, if you are pin-limited or space limited, a UNI/O device may be the best answer.
  10. The major EEPROM tool is the MPLAB® starter kit for serial EEPROM products. It is not just a memory programmer, but a debugging tool. You can use the programming and read functions to write to or read from any Microchip serial EEPROM device. The tool features byte, block, and array functionality. And, you can transfer data to and from external files. The second major tool is the Total Endurance TM modeling software. Recall that understanding endurance can be crucial. In this free, downloadable software, you can enter application-specific data to model the expected endurance of that application. Finally, Microchip offers a large number of Verilog models on its website for download.
  11. Thank you for taking the time to view this presentation on Serial EEPROM . If you would like to learn more or go on to purchase some of these devices, you can either click on the link embedded in this presentation, or simple call our sales hotline. For more technical information you can either visit the Microchip site – link shown – or if you would prefer to speak to someone live, please call our hotline number, or even use our ‘live chat’ online facility.