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Key Encoder IC - BU1851GUW

Key Encoder IC can monitor up to 8x8 matrix (64 keys), which means to be adaptable to Qwerty keyboard. We adopt the architecture that the information of the only key which status is changed, like push or release, is encoded into the 8 bits data. This can greatly reduce the CPU load which tends to become heavier as the number of keys increase. (Previously, all key's status is stored in the registers.) Furthermore, auto sleep function contribute to low power consumption, when no keys are pressed. It is also equipped with the various functions such as ghost key rejection, N-key Rollover, Built-in power on reset and oscillator.

* This product is a STANDARD grade product and not recommend for on-vehicle devices.
Part Number
Unit Quantity
Minimum Package Quantity
Packing Type
BU1851GUW-E2 Active VBGA035W040 2500 2500 Taping Yes
Supply Voltage(Min.)[V] 2.2
Supply Voltage(Max.)[V] 3.6
Serial I/F Original
Power ON Reset Yes
Output Format -
Operating Temperature (Min.)[°C] -30
Operating Temperature (Max.)[°C] 85
  • ・Monitor up to 64-matrix keys
    ・Under 5uA Stand-by Current
    ・Built-in Power On Reset
    ・Ghost key rejection
Technical Data
Application Note

Thermal Resistance