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GPIO Expander ICs - BU1852GXW

Keyencoder IC BU1852 can monitor up to 8x12 matrix (96 keys), which means to be adaptable to Qwerty keyboard. Weadopt the architecture that the information of the only key which status is changed, like push or release, is encoded into the8 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.) When the number of keys is small, the extra ports can be used asGPIO. Furthermore, auto sleep function contributes to low power consumption, when no keys are pressed. It is alsoequipped 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
Constitution Materials List
BU1852GXW-E2 Active UBGA035W030 3000 3000 Taping inquiry Yes
Supply Voltage(Min.)[V] 1.65
Supply Voltage(Max.)[V] 3.6
Num. of GPIO port 20
Serial I/F I2CBUS, Original
Power ON Reset Yes
Num. of Slave Address 2
Output Format CMOS output, OPEN Drain output
Operating Temperature (Min.)[°C] -30
Operating Temperature (Max.)[°C] 85
  • ・ Monitor up to 96 matrix keys.
    ・ Under 3μA Stand-by Current
    ・ Built-in Power on Reset.
    ・ Ghost key rejection.
    ・ Keyscan / GPIO selectable
    ・ 3 volt tolerant Input
Technical Data
Application Note

Thermal Resistance