Key Encoder IC

ROHM's key encoder IC can monitor up to 64 keys (8x8 matrix), making it suitable for QWERTY keyboards. Only key changes are are encoded (8bit), reducing microcontroller load significantly compared with conventional systems that store the status of all keys in the registry. Additional functions include ghost key rejection, N-key rollover, Power ON Reset function, and an oscillator.

RoHM'SGPIO ICs

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Specifications Part No. Package Features
64 keys Type

Block Diagram

 
Expanded
   

Features

Detects and encodes (8bit) key changes
 

Only key changes are are encoded (8bit data via 3-wire interface), significantly reducing microcontroller load compared with conventional systems that store the status of all keys in the registry.

 
Expanded
Monitors up to 64 keys (8x8 matrix)
Ghost key rejection function
Standby current <5µA
Integrated oscillator and Power ON Reset function

GPIO ICs

Part No. Supply Voltage (V) Num. of GPIO port Serial I/F Power ON Reset Num. of Slave Address Output format Package RoHS Distribution Inventory
BU1851GUW 2.20 to 3.60 - Original Yes - - VBGA035W040 Yes