The DS1285Q can support up to 8 devices on the same bus, as it has 3 address pins that allow for up to 8 unique addresses.
The DS1285Q has an internal power-on reset circuit that resets the device to its default state when power is first applied. This ensures that the device starts in a known state.
The VCC pin is the power supply pin for the DS1285Q. It should be connected to a stable 5V power supply, and is used to power the internal circuitry of the device.
Yes, the DS1285Q can be used in a battery-backed application. The device has a battery input pin (VBAT) that allows an external battery to be connected to maintain the RTC and RAM contents when the main power supply is removed.
The internal oscillator of the DS1285Q has an accuracy of ±10 minutes per year at 25°C, which is sufficient for most general-purpose applications. However, if higher accuracy is required, an external crystal oscillator can be used.
