DS1306EN datasheet by Dallas Semiconductor

DS1306EN Frequently Asked Questions (FAQs)

• What is the minimum voltage required to maintain the RTC's timekeeping function?
  The DS1306EN can maintain its timekeeping function with a minimum voltage of 1.5V, but it's recommended to keep it above 2.0V for reliable operation.
• How accurate is the DS1306EN's internal oscillator?
  The DS1306EN's internal oscillator has an accuracy of ±20 ppm (parts per million) over the operating temperature range of -40°C to +85°C.
• Can I use the DS1306EN with a battery backup?
  Yes, the DS1306EN has a built-in battery switchover circuit that allows it to switch to a backup battery when the main power supply fails. The backup battery should be a 3V lithium cell with a capacity of at least 48mAh.
• How do I set the initial time and date on the DS1306EN?
  The initial time and date can be set by writing to the RTC's registers using an I2C interface. The DS1306EN has a set of registers that store the time and date information, and these registers can be written to using an I2C master device such as a microcontroller.
• What is the maximum clock frequency that the DS1306EN can operate at?
  The DS1306EN can operate at clock frequencies up to 400 kHz, but it's recommended to use a clock frequency of 100 kHz or less to ensure reliable operation.