AM1815AQ - Ambiq Micro, Inc.

AM1815AQ Frequently Asked Questions (FAQs)

• What is the recommended PCB layout for optimal performance?
  A 4-layer PCB with a solid ground plane and a separate power plane is recommended. Keep the analog and digital sections separate, and use a ferrite bead or a 10uF capacitor to filter the power supply.
• How do I optimize the crystal oscillator circuit for best performance?
  Use a high-quality crystal with a load capacitance of 10pF to 20pF. Ensure the crystal is placed close to the AM1815AQ, and use a 1kΩ to 2kΩ resistor in series with the crystal to limit the current.
• What is the recommended power-up sequence for the AM1815AQ?
  Power up the VDD pin first, followed by the VBAT pin. Ensure VDD is stable before applying VBAT. The power-up sequence is critical to prevent latch-up and ensure proper operation.
• How do I handle the brown-out reset (BOR) function?
  The BOR function is enabled by default. To disable it, tie the BOR_EN pin to VSS. If enabled, the BOR threshold is 1.8V. You can adjust the threshold by connecting a resistor divider network to the BOR pin.
• What is the maximum current consumption of the AM1815AQ?
  The maximum current consumption is 1.5mA in active mode and 1.5μA in sleep mode. However, this can vary depending on the clock frequency, voltage, and operating conditions.