The recommended operating temperature range for the MK53732B is -40°C to 125°C, as specified in the datasheet. However, it's essential to note that the device can operate at temperatures beyond this range, but with reduced performance and reliability.
To configure the clock source, you need to set the CLK_SEL pin to select the internal oscillator (CLK_SEL = 0) or an external clock source (CLK_SEL = 1). Additionally, ensure that the clock frequency is within the recommended range of 1 MHz to 32 kHz for optimal performance.
The VBAT pin is used to connect a battery or a supercapacitor to provide power to the real-time clock (RTC) and the backup registers during power-down mode. Connect a battery or a supercapacitor with a recommended value of 2.5 V to 3.6 V to the VBAT pin, and ensure that it's decoupled from the main power supply (VDD) using a diode or a voltage regulator.
To implement a reliable POR circuit, connect a capacitor (typically 10 nF to 100 nF) between the VDD pin and the GND pin. This capacitor will help to filter out noise and ensure a clean power-on reset. Additionally, consider adding a voltage supervisor or a reset IC to provide a more robust POR function.
When designing a PCB with the MK53732B, ensure that the layout and routing are done carefully to minimize noise and interference. Keep the clock signal traces short and away from other signals, and use a solid ground plane to reduce electromagnetic interference (EMI). Additionally, consider using a 4-layer PCB with a dedicated power plane and a dedicated ground plane for optimal performance.
