This reference design is a verified Keyboard Scanner or controller. This 128 key scan device is specifically targeted towards end equipment that runs on Windows 8 operating system. The device is fully compliant with the HID over I2C specification (ver 1.0) defined by Microsoft.
Features:
– Supports I2C Fast Mode+ speed up to 1MHz
– Can support up to 128 (8×16) key scan
– Open-Drain active low INT output
– Open drain outputs can sink up to 12mA current for LED
– Software Reset per HID over I2C standard
– Internal pull-up resistors make implementation easy with no need for external components
Parts Include:
TCA8424: Low-Voltage 8×16 Keyboard Scanner With HID over I2C Compliant Interface
TPS77001 : Single Output LDO, 50mA, Adj.(1.2 to 5.5V), Low Quiescent Current
Learn more by downloading the reference design below
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