SUMMARY DESCRIPTION. These electrically erasable programmable memo- ry (EEPROM) devices are accessed through a Se- rial Data. 93C46 are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for 93C 93C46 datasheet, 93C46 pdf, 93C46 data sheet, datasheet, data sheet, pdf, Microchip, 1K V Microwire Serial EEPROM.
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The early versions are long since gone. The user interface is simple and shouldn’t need documentation. It can be used without much difficulty with a 93C46, by avoiding calls to the routines that manipulate the extended features of the 93CS In addition, WEN may have to have been called, check your data sheet or just do it to be on the safe side.
Of course, WEN must still be called before writing. This 3-Wire interface chip actually has 6 wires. Usually, the 3-wire devices require an addition wire beyond the 3 for data transfer for each chip to be used.
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A simpler approach may be to set the bit addresses of these bits in the. Disclaimer These 93C46 Serial EEPROM devices are used in many commercial products where the data contained within the chip, though only bytes, is considered confidential and proprietary.
It applies to both the 93C46 and 93CS46 chips. Please consult the relevant Atmel datasheet. As mentioned above, four datashet are actually required, and the 93CS46 has two additional lines that work together with a special write protection register. To reclaim these pins, remove all the instructions that use ” pe ” and ” pre ” symbols. The erase functions are not implemented here.
Paul’s Code Library, 93C46 and 93CS46 Serial EEPROM
These devices are usually used to store user configurable parameters and device serial numbers. National Semiconductor has lots of data sheets on-line. Because these chips use a serial interface, they can not be read quickly enough to serve as conventional memory. It’s up 93cc46 you. Their literature number is The erase functions provided in the 93C46 are unnecessary for the chips I’ve used, double check your data sheet.
To you, the system designer, these little chips offer a nifty way to store a small amount of data in non-volatile memory, using only a few of the datasheeg pins, and without raising the system’s cost much.
The routines available for your code are: Outputslbit12 0.
They are usually specified to retain the data for 10 years and to endurewrite operations before failure. It is not necessary to erase memory locations before writing.
The two extra pins not required for the 93C46 are manipulated by all the routines. As a practical matter, the code offered below only works with the Microwire 3 Wire interface, and is specifically intended to work with the 93C46, which is a standard part available from a variety of distributors. Flasher with Trailer Control Atmelswitches to frequency doubling, just like the standard flashers e.
MicroChip now has data sheets on-line for most of their products. The next access should be to this register instead of the memory. This operation must be performed before a write may be issued. Details of each macro can be found on the Atmel web site, at http: Both the and ER use the 93C46 serial.
Previous 1 2 I 2 C is a trademard of Philips. A zero byte payload will return the current status. Unprotected memory locations are still subject to WEN and WDSbut protected locations are unwritable unless the protection register is changed or cleared.
Xicor once had a considerable collection of example code on-line, but they 93c64 to have removed it.
They have also added example code similar to the code below, as well datassheet for I 2 C parts they offer. If you do use it, I hope that you’ll give me some feedback.
F Errata Sheet Rev. See full device support list fortool by a number of major semiconductor manufacturers, including Altera, AMD, AtmelFairchild. This routine just waits for it to finish before returning They only require a 5 volt power supply some 3V only versions exist too. The menu-driven example code includes a copy of these routines and calls them properly to allow the user to view and edit the values within a 93CS Partof the design will decrease in an Atmel part as we do not sacrifice lo gi c to i m pl eme nt th e.
Coliseum Business Centre Riverside Way. PRDS Permenantly freeze the protection register to its current value.