The recommended crystal oscillator frequency for the DS3232MZ/V+T is 32.768 kHz, which is a standard frequency for real-time clocks.
The internal oscillator of the DS3232MZ/V+T has an accuracy of ±2 ppm at 25°C, which is relatively low compared to an external crystal oscillator. However, it can still provide a reasonable clock accuracy for many applications.
No, the DS3232MZ/V+T is not designed to operate with a battery voltage below 2.3V. The minimum operating voltage is 2.3V, and the device may not function correctly or at all below this voltage.
The DS3232MZ/V+T has a built-in battery switchover circuit that automatically switches to the backup battery during power failure. The device can detect the power failure and switch to the backup battery in less than 1 ms.
The maximum current consumption of the DS3232MZ/V+T is 1.2 mA during normal operation, and 0.5 μA during battery-backed mode.