DS12885N+ datasheet by Maxim Integrated Products

DS12885N+ Frequently Asked Questions (FAQs)

• What is the recommended power-up sequence for the DS12885N+?
  The recommended power-up sequence is to apply VCC first, followed by VBAT. This ensures that the internal voltage regulators are properly initialized.
• How do I ensure that the DS12885N+ oscillator starts reliably?
  To ensure reliable oscillator startup, make sure that the crystal oscillator circuit is properly designed and laid out, and that the crystal is of high quality. Also, ensure that the VCC supply is stable and within the recommended range.
• What is the maximum allowed capacitance on the VBAT pin?
  The maximum allowed capacitance on the VBAT pin is 10uF. Exceeding this value may affect the device's ability to properly switch between battery and VCC power sources.
• How do I handle the case where the battery is completely drained?
  In the event that the battery is completely drained, the DS12885N+ will automatically switch to VCC power when it is available. However, it is recommended to implement a power-on reset circuit to ensure that the system resets properly when power is reapplied.
• What is the purpose of the TRICKLE pin, and how do I use it?
  The TRICKLE pin is used to trickle-charge a battery when the system is in shutdown mode. To use it, connect a resistor between the TRICKLE pin and the positive terminal of the battery, and ensure that the resistor value is within the recommended range specified in the datasheet.