To minimize noise and ensure optimal performance, it is recommended to follow a star-grounding scheme, keep the analog and digital grounds separate, and use a solid ground plane. Additionally, keep the crystal oscillator traces as short as possible and away from noisy digital signals.
To ensure the accuracy of the RTC, use a high-quality crystal oscillator, ensure the crystal is properly loaded, and use a stable power supply. Additionally, consider using a temperature-compensated crystal oscillator (TCXO) for improved accuracy.
The recommended power-up sequence is to apply the power supply voltage (VCC) before the battery voltage (VBAT). This ensures that the internal voltage regulators are properly enabled before the battery is connected.
The battery switchover function can be handled by connecting the battery voltage (VBAT) to the VCC pin through a diode or a switch. This allows the device to automatically switch to battery power when the main power supply (VCC) fails.
To minimize power consumption, use the power-down mode, disable unnecessary peripherals, and use a low-power oscillator. Additionally, consider using a low-power RTC and optimizing the system's power management scheme.
MAX313LESE+ datasheet
by Maxim Integrated Products
