DS1390U-3+ datasheet by Maxim Integrated Products

DS1390U-3+ Frequently Asked Questions (FAQs)

• What is the recommended operating voltage range for the DS1390U-3+?
  The recommended operating voltage range for the DS1390U-3+ is 2.7V to 5.5V.
• How do I ensure the accuracy of the real-time clock (RTC) in the DS1390U-3+?
  To ensure the accuracy of the RTC, use a high-quality crystal oscillator with a frequency tolerance of ±20 ppm or better, and ensure that the oscillator is properly loaded and terminated.
• What is the purpose of the VBAT pin on the DS1390U-3+?
  The VBAT pin is used to connect a battery or a supercapacitor to maintain the RTC and SRAM data during power failures or when the main power supply is turned off.
• How do I interface the DS1390U-3+ with a microcontroller?
  The DS1390U-3+ can be interfaced with a microcontroller using a 3-wire serial interface (SCL, SDA, and RST) or a 2-wire serial interface (SCL and SDA). The microcontroller can access the RTC, SRAM, and other registers using I2C protocol.
• What is the maximum frequency of the clock output (CLKOUT) on the DS1390U-3+?
  The maximum frequency of the clock output (CLKOUT) on the DS1390U-3+ is 32.768 kHz.