The recommended layout and routing for the DS1705ESA 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 is recommended to use a low-ESR capacitor for the VCC bypass and to keep the power supply lines as short as possible.
To ensure the accuracy of the DS1705ESA's clock output, it is recommended to use a high-quality crystal oscillator with a low equivalent series resistance (ESR) and a high Q factor. Additionally, the device should be operated within its specified temperature range, and the power supply should be stable and free of noise.
Yes, the DS1705ESA can be used with a battery-backed clock (BBR). The device has a built-in battery switch that allows the clock to continue running during power failures. The BBR input can be connected to a battery or a supercapacitor, and the device will automatically switch to the backup power source during a power failure.
The DS1705ESA's clock calendar can be programmed using a serial interface such as I2C or SPI. The device has a set of registers that can be written to set the clock calendar, including the seconds, minutes, hours, day, month, and year. The device also has a set of alarm registers that can be used to set alarms and interrupts.
The maximum operating temperature range of the DS1705ESA is -40°C to +85°C. However, the device can be operated at temperatures up to +125°C for short periods of time during manufacturing or testing.
DS1705ESA datasheet
by Maxim Integrated Products
