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Ambiq AM18x5 Real-Time Clocks

Ambiq Artasie AM18x5 Real-Time Clocks combine ultra-low power with a highly sophisticated feature set. The AM18x5 offers significant low power requirements as low as 14nA. The AM18x5 RTCs are based on Ambiq's innovative SPOT® (Subthreshold Power Optimized Technology) CMOS platform.

The Ambiq AM18x5 includes on-chip oscillators to supply minimum power consumption, full RTC functions including battery backup and programmable counters and alarms for timer and watchdog functions, and either an l2C or SPI serial interface for communication with a host controller. An integrated power switch and an elaborate system sleep manager with counter, timer, alarm, and interrupt capabilities permit the AMI8x5 to be a supervisory component in a host microcontroller-based system.

Features

  • Ultra-low supply current (all at 3V)
    • 14nA with RC oscillator
    • 22nA with RC oscillator and auto-calibration
    • 55nA with crystal oscillator
  • Baseline timekeeping:
    • 32.768kHz crystal oscillator with integrated load capacitor/resistor
    • Counters for hundredths, seconds, minutes, hours, date, month, year, century, and weekday
    • Alarm capability on all counters
    • Programmable output clock generation (32.768kHz to 1 year)
    • Countdown timer with repeat function
    • Automatic leap year calculation
  • Advanced timekeeping
    • Integrated power-optimized RC oscillator
    • Advanced crystal calibration to ±2ppm
    • Advanced RC calibration to ±16ppm
    • Automatic calibration of RC oscillator to crystal oscillator
    • Watchdog timer with hardware reset
    • 256 bytes of general-purpose RAM
  • Power management
    • Integrated ~1Ω power switch for off-chip components such as a host MCU
    • System sleep manager for managing host processor wake/sleep states
    • External reset signal monitor
    • Reset output generator
    • Supercapacitor trickle charger with programmable charging current
    • Automatic switchover to VBAT
    • External interrupt monitor
    • Programmable low battery detection threshold
    • Programmable analog voltage comparator
  • l2C (up to 400kHz) and 3- or 4-wire SPI (up to 2MHz) serial interfaces available
  • 1.5V to 3.6V operating voltage
  • 1.5V to 3.6V clock and RAM retention voltage
  • -40°C to +85°C operating temperature range
  • All inputs include Schmitt triggers
  • 3mm x 3mm QFN-16 package
  • Also available in wafer form

Applications

  • Smart cards
  • Wireless sensors and tags
  • Medical electronics
  • Utility meters
  • Data loggers
  • Appliances
  • Handsets
  • Consumer electronics
  • Communications equipment

Associated Board

Ambiq Artasie AM1805 Evaluation Board

Board offers an easy method to measure and evaluate the AM08x5 real-time clocks.

Learn Moreüber Ambiq Artasie AM1805 Evaluation Board View Productsverwandt mit Ambiq Artasie AM1805 Evaluation Board

Additional Resources

Typical Applications

Application Circuit Diagram - Ambiq AM18x5 Real-Time Clocks

Block Diagram

Block Diagram - Ambiq AM18x5 Real-Time Clocks
Veröffentlichungsdatum: 2023-10-11 | Aktualisiert: 2023-11-29