Myrra recommends a 4-layer PCB with a solid ground plane, and to keep the analog and digital grounds separate. Additionally, it's recommended to use a low-ESR capacitor for the power supply decoupling.
To ensure reliable communication, use a pull-up resistor on the SDA line, and make sure the microcontroller's I2C clock frequency is within the 48021's specified range (100 kHz to 400 kHz). Also, use a buffer or repeater if the distance between the devices exceeds 1 meter.
The 48021 is rated for operation from -40°C to 85°C, but it's recommended to derate the device by 1°C per 1,000 feet above sea level to ensure reliable operation.
While the 48021 is not hermetically sealed, it can operate in humid environments. However, it's recommended to apply a conformal coating to protect the device from moisture and to follow proper PCB assembly and handling procedures.
Use a logic analyzer or oscilloscope to monitor the I2C bus signals, and check for proper signal levels, clock frequency, and data transmission. Also, verify that the microcontroller's I2C configuration matches the 48021's requirements.
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