The recommended power-up sequence is to apply VCC first, followed by VBAT. This ensures that the internal oscillator is stabilized before the RTC starts counting.
When the battery is removed or replaced, the DS1337C# will reset and lose its clock data. To handle this, use a capacitor to maintain the VBAT voltage during battery replacement, or use a supervisory circuit to detect battery removal and reset the device.
The RST pin is an active-low reset input that resets the DS1337C# when pulled low. It can be used to reset the device during power-up or to recover from a fault condition. Connect a pull-up resistor to VCC and a capacitor to ground to ensure a clean reset signal.
To ensure accurate timekeeping, use a high-quality crystal oscillator, ensure the device is operated within the recommended temperature range, and avoid exposing the device to electromagnetic interference (EMI). Additionally, consider using a temperature-compensated crystal oscillator for improved accuracy.
Yes, the DS1337C# can be used in a battery-backed SRAM application. The device's VBAT pin can be connected to a battery, and the SRAM can be connected to the device's data bus. The DS1337C# will maintain the SRAM data during power-down and restore it when power is reapplied.
DS1337C# datasheet
by Maxim Integrated Products
