A good PCB layout for the TCA8418EYFPR involves keeping the input and output traces short and away from each other, using a solid ground plane, and placing decoupling capacitors close to the device. Additionally, using a shielded cable for the keyboard interface can help reduce EMI.
The TCA8418EYFPR has built-in debounce circuitry, but it's recommended to add additional external debounce capacitors (e.g., 100nF) between the keyboard interface pins and GND to further reduce switch bounce and noise.
The maximum cable length for the keyboard interface depends on the specific application and environment. As a general guideline, cable lengths up to 10 meters (33 feet) are typically acceptable, but longer lengths may require additional signal conditioning or repeaters.
The TCA8418EYFPR can be configured for different keyboard layouts using the device's internal registers. The specific configuration depends on the desired keyboard layout and can be achieved through I2C commands or by using a keyboard layout configuration tool provided by Texas Instruments.
The power consumption of the TCA8418EYFPR depends on the operating mode and frequency. In active mode, the device typically consumes around 10mA, while in standby mode, it consumes around 10uA. The exact power consumption can be found in the datasheet or by consulting with Texas Instruments support.
TCA8418EYFPR datasheet
by Texas Instruments
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