Also available in wafer form

  • Ultra-low supply current:
    • <14nA with RC oscillator
    • <22nA with RC oscillator and autocalibration
    • <55nA with crystal oscillator
  • Baseline timekeeping features:
    • 32 kHz 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 kHz to 1/year)
    • Countdown timer with repeat function
    • Automatic leap year calculation
  • Advanced timekeeping features:
    • Integrated power optimized RC oscillator
    • Advanced crystal calibration to ± 2 ppm
    • Advanced RC calibration to ± 16 ppm
    • Automatic calibration of RC oscillator to crystal oscillator
    • Watchdog timer with hardware reset
  • Advanced power management features:
    • Integrated <1Ω power switch for off-chip components such as a host MCU, radio, sensor, etc.
    • System sleep manager for managing host processor wake/sleep states
    • External interrupt monitor
    • External reset signal monitor
    • Reset output generator
    • Automatic switchover to VBAT
    • Supercapacitor trickle charger with programmable charging current
    • Programmable brown out detection
    • Programmable analog voltage comparator
  • Up to 256 bytes of general purpose RAM
  • I2C (up to 400 kHz) or SPI (up to 2 MHz) serial interface
    • Supports 3-wire and 4-wire SPI
  • Operating Voltage 1.7-3.6 V
  • Clock and RAM retention voltage 1.5-3.6 V
  • Operating temperature –40 to 85 °C
  • 3 mm x 3 mm QFN-16 package
  • Also available in wafer form


AM18xx Documentation

Development kit


AM18xx family summary

Part #Baseline TimekeepingAdvanced TimekeepingPower ManagementInterface
XT OscNumber of GP OutputsRC OscCalib/ Auto-calibWatch-dogRAM (B)VBAT SwitchReset MgmtExt IntPower Switch and Sleep FSM