DS1302S datasheet by Dallas Semiconductor

DS1302S Frequently Asked Questions (FAQs)

• What is the recommended power-on reset circuit for the DS1302S?
  A 0.1uF capacitor between VCC and GND, and a 1kΩ resistor between VCC and RST can be used to ensure a clean power-on reset.
• How do I handle the case where the battery is removed and reinserted?
  When the battery is reinserted, the DS1302S will retain its previous time and date. However, it's recommended to reinitialize the clock and set the time and date again to ensure accuracy.
• What is the maximum clock frequency that can be used with the DS1302S?
  The DS1302S can operate with a clock frequency up to 1MHz, but it's recommended to use a 32.768kHz crystal oscillator for optimal performance and accuracy.
• How do I ensure that the DS1302S is accurately keeping time?
  Regularly update the clock with an accurate time source, and use a high-quality crystal oscillator with a low frequency tolerance (e.g., ±20ppm) to minimize clock drift.
• Can I use the DS1302S with a lithium-ion battery?
  No, the DS1302S is designed to work with a non-rechargeable lithium battery (CR2032 or equivalent). Using a lithium-ion battery may cause damage to the device.