PCF2100CT/F1,112 datasheet by NXP Semiconductors

PCF2100CT/F1,112 Frequently Asked Questions (FAQs)

• What is the recommended operating voltage range for PCF2100CT/F1,112?
  The recommended operating voltage range for PCF2100CT/F1,112 is 1.8V to 5.5V, with a typical voltage of 3.3V.
• How do I ensure the RTC clock accuracy in PCF2100CT/F1,112?
  To ensure RTC clock accuracy, use a high-quality crystal oscillator, follow the recommended crystal load capacitance, and implement a robust power supply decoupling scheme. Additionally, consider using a temperature-compensated crystal oscillator (TCXO) for improved accuracy.
• Can I use PCF2100CT/F1,112 in a battery-powered device?
  Yes, PCF2100CT/F1,112 is suitable for battery-powered devices due to its low power consumption (typical Idd = 0.4 μA at 3.3V). However, ensure proper power management, such as using a low-dropout regulator (LDO) and minimizing power consumption during sleep modes.
• How do I interface PCF2100CT/F1,112 with a microcontroller?
  PCF2100CT/F1,112 can be interfaced with a microcontroller using the I2C bus. Ensure the microcontroller's I2C clock frequency is within the recommended range (100 kHz to 400 kHz), and use the correct I2C address (0x51 or 0x52) depending on the device configuration.
• What is the purpose of the VBAT pin on PCF2100CT/F1,112?
  The VBAT pin is used to connect a backup battery or supercapacitor to maintain the RTC's timekeeping function during power failures. This pin should be connected to a battery or supercapacitor with a voltage range of 1.8V to 5.5V.