Information

Need more microcontroller pins for new features?
Want to stay with a low pin-count microcontroller rather than
switching to a more expensive one?
Microchip’s new UNI/O serial EEPROM uses only ONE connection to the host microcontroller. This compares to two
or three pins for I
2
C™, and three to six pins for Microwire or SPI buses. This new, proprietary bus offers advanced
features like a status register and write protection on demand, along with all I/O, memory array and command
functions through a single pin.
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Single I/O Interface
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1-16 Kbit Memory Densities
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1.8-5.5V Operating Voltage
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10-100 KHz Operating Frequency
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1 Million Erase/Write Cycles
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Software Write Protect
–
¼, ½ or Full Array
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Status Register
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Set/Erase entire memory with a single command
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ESD Protection > 4 KV
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Noise Filtration Circuitry
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Packaging: 3-pin SOT-23
8-pin SOIC, MSOP & TDFN
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Temperature: Industrial (-40ºC to +85ºC)
Extended (-40ºC to +125ºC)
Advanced Features
Benefi ts
www.microchip.com/UNIO
A single I/O EEPROM can simplify your design and
reduce system cost
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Free up pins on the MCU
–
Add a new feature to your application
–
Move to a smaller MCU
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Free up pins on your connector
–
Smaller connector = lower cost
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More compact design
Introducing the UNI/O EEPROM Family
New Communications Standard
UNI/O bus: First introduced on serial EEPROMs
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Manchester Communications
– Clock and data in a single serial bit stream
– Signal transition in the middle of bit period
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MCU establishes data rate
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EEPROM tracks data rate − Frequency and Phase
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Software Addressable
Use your existing hardware
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UNI/O EEPROMs can fi t in existing sockets
– Pin-out similar to I
2
C and SPI EEPROMs
–
8-pin packages share Vcc, Vss and Data Line
Get Started With a Simple Evaluation
Current EEPROM 8-lead Pin Outs
Use Microchip’s software drivers
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UNI/O software drivers available for many popular
microcontrollers
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New drivers coming