The recommended layout and routing for the DS3906U+ involves keeping the analog and digital grounds separate, using a solid ground plane, and minimizing the length of the traces between the device and the crystal oscillator. Additionally, it's recommended to use a 4-layer PCB with a dedicated power plane and a dedicated ground plane.
To ensure the DS3906U+ is properly powered and decoupled, use a high-quality power supply with low noise and ripple, and decouple the device with a 10uF ceramic capacitor and a 100nF ceramic capacitor in parallel, placed as close as possible to the device's power pins.
The maximum frequency deviation allowed for the crystal oscillator is ±100ppm over the entire operating temperature range. This ensures that the DS3906U+ can accurately generate the required clock frequency.
To configure the DS3906U+ for a specific clock frequency, use the device's internal registers to set the desired frequency, and then use an external crystal oscillator with the correct frequency and load capacitance values. The device's datasheet provides a detailed explanation of the register settings and crystal oscillator requirements.
The recommended method for resetting the DS3906U+ is to use the device's internal power-on reset (POR) circuit, which automatically resets the device when the power supply voltage falls below a certain threshold. Alternatively, an external reset signal can be applied to the device's reset pin, but this method is not recommended as it may cause the device to malfunction.
DS3906U+ datasheet
by Maxim Integrated Products
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