Introduction

Ambiq offers the world’s lowest power Real-Time Cock (RTCs) with or without power management.

Part NumberInterfacePackageSize (mm)SRAM (byte)Power ManagementTrickle Charger
AM1805AQI2C16-Pin QFN3x3256xx
AM1815AQSPI16-Pin QFN3x3256xx
AM0805AQI2C16-Pin QFN3x3256
AM0815AQSPI16-Pin QFN3x3256

RTC Factsheet

Visit our Webshop if you are interested to buy some parts!

Products

  • RTCs without power management
  • RTCs with power management

RTCs without power management

The Ambiq Micro AM08xx Low Power Real-Time Clock (RTC) family provides a groundbreaking combination of ultra-low power coupled with a highly sophisticated feature set. With power requirements significantly lower than any other industry RTC (as low as 14nA in RC mode, 22nA in auto calibration mode, 55nA in XT mode), these are the first semiconductor products based on Ambiq Micro’s innovative SPOT™ (Subthreshold Power Optimized Technology) CMOS Platform.

Visit our Webshop if you are interested to buy some parts!

Picture of RTC

Features

  • Ultra-low supply current:
    • <14nA with RC oscillator
    • <22nA with RC oscillator and auto calibration
    • <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
  • Enhanced I/O features:
    • Automatic switchover to VBAT
    • External interrupt monitor
    • 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

AM08xx family summary

Part #Baseline Timekeeping Advanced Timekeeping   Enhanced I/O Interface
XT OscNumber of GP OutputsRC OscCalib/ Auto-calibWatch-dogRAM (B)VBAT SwitchExt Int
AM08054256I²C
AM08153256SPI

For AM08xx Documentation, please contact us at ambiq-Info@eu.kagafei.com

Visit our Webshop if you are interested to buy some parts!

RTCs with power management

The Ambiq Micro AM18xx Low Power Real-Time Clock (RTC) family provides a groundbreaking combination of ultra-low power coupled with a highly sophisticated feature set optimized for system-level power management.

With power requirements significantly lower than any other industry RTC (as low as 14nA in RC mode, 22nA in auto calibration mode, 55nA in XT mode), these are the first semiconductor products based on Ambiq Micro’s innovative SPOT™ (Subthreshold Power Optimized Technology) CMOS Platform.

Advanced power management features includes an integrated power switch and a sophisticated system sleep manager with counter, timer, alarm, and interrupt capabilities that allows the AM18xx to be used as a complete system-level power manager.
Also available in wafer form.

Visit our Webshop if you are interested to buy some parts!

Picture of RTC

Features

  • Ultra-low supply current:
    • <14nA with RC oscillator
    • <22nA with RC oscillator and auto calibration
    • <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 family summary

Part #XT OscNumber of GP OutputsRC OscCalib/ Auto-calibWatch-dogRAM (B)VBAT SwitchReset MgmtExt IntPower Switch and Sleep FSMInterface
AM1805x4xxx256xxxxI²C
AM1815x3xxx256xxxxSPI

For AM18xx Documentation, please contact us at ambiq-Info@eu.kagafei.com

Visit our Webshop if you are interested to buy some parts!

Applications

Which applications are concerned?

  • Smart cards
  • Wireless sensors and IoT
  • Wearable health and fitness devices
  • Medical electronics
  • Utility meters
  • Data loggers
  • Appliances
  • Consumer electronics

Visit our Webshop if you are interested to buy some parts!

Supplier Profile

Company Overview

Ambiq Micro was founded in 2010 on the notion that extremely low power semiconductors are the key to the future of electronics. The company developed a patented Subthreshold Power Optimized Technology (SPOT™) platform that dramatically reduces the amount of power consumed by semiconductors. Normal CMOS processes are working with an internal core voltage above the threshold voltage a transistor needs to make a logical low or high decision. Therefore most cores are working at 1.8V or 1.2V depending on the CMOS process.

By applying SPOT™ on a standard CMOS process, the internal core voltage can be minimized to 0.5V. While the energy consumption is proportional to the squared voltage, SPOT™ can reduce energy usage by up to 13 times!

Visit our Webshop if you are interested to buy some parts!