The maximum clock frequency for the PCF8582AT is 100 kHz. However, it's recommended to use a clock frequency between 32 kHz and 50 kHz for optimal performance.
The PCF8582AT has a built-in power-on reset (POR) circuit that resets the device when the supply voltage (VCC) is below 1.5V. To handle POR, ensure that the VCC rises slowly and monotonically during power-up, and that the clock signal is stable before accessing the device.
The X1 and X2 pins are used to connect an external crystal oscillator, which provides the clock signal for the device. These pins are not used when an external clock signal is applied to the CLK pin.
The PCF8582AT can be configured for 12-hour or 24-hour mode by setting the HM (hour mode) bit in the control register. Setting HM=0 selects 12-hour mode, while setting HM=1 selects 24-hour mode.
The SQW/OUT pin can be configured as either a square wave output (SQW) or an output pin (OUT). In SQW mode, it generates a square wave signal at a frequency of 1 Hz, 4 kHz, or 8 kHz, depending on the SQW frequency selection bits. In OUT mode, it can be used as a general-purpose output pin.
