Intro 01 Feature Highlights 02 Specifications 03 Documents 04 Buy 04

Artasie Real-Time Clock - AM1805 01

The Ambiq^® Artasie Real-Time Clock AM1805 with Power Management 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 14 nA), these are the first semiconductors based on Ambiq’s innovative SPOT^® (Subthreshold Power Optimized Technology) CMOS platform.

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Detailed Functional Block Diagram for Ambiq Artasie RTC - AM1805

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The AM1805 includes on-chip oscillators to provide minimum power consumption, full RTC functions including battery backup and programmable counters and alarms for timer and watchdog functions, and a I²C serial interface for communication with a host controller. An integrated power switch and a sophisticated system sleep manager with counter, timer, alarm, and interrupt capabilities allows the AM1805 to be used as a supervisory component in a host microcontroller based system.

Pin Configuration Diagram for Ambiq Artasie RTC - AM1805

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Feature Highlights 02

Companion for Host Processors

Serves as a companion part for host processors including microcontrollers, radios, and digital signal processors.

3 Distinct Feature Groups

Includes three distinct feature groups: 1) baseline timekeeping, 2) advanced timekeeping, and 3) power management.

Ultra-Low Current Draw

Baseline timekeeping feature group supports the standard 32.786 kHz crystal (XT) oscillation mode for maximum frequency accuracy with an ultra-low current draw of 55 nA.

Proprietary Calibration Algorithm

A proprietary calibration algorithm allows the AM1805 to digitally tune the RC oscillator frequency and the XT oscillator frequency with accuracy as low as 2 ppm at a given temperature.

Advanced Timekeeping

Advanced timekeeping feature group supports two additional oscillation modes: 1) RC oscillator mode, and 2) Autocalibration mode.

Finite State Machine

Includes a finite state machine that can control a host processor as it transitions between sleep/reset states and active states.

Integrated Power Switch

Integrates a power switch with ~1 Ω impedance that can be used to cut-off ground current on the host microcontroller and reduce sleep current to <1 nA.

Specifications

Specifications 03

Ultra-Low Supply Current
14 nA with RC oscillator
22 nA with RC oscillator and Autocalibration
55 nA with crystal oscillator

Baseline Timekeeping
4x GPIO Outputs
32.768 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 (32.768 kHz to 1 year)
Countdown timer with repeat function
Automatic leap year calculation

Artasie AM1805
AM1805AQ

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Artasie AM1805<br>Evaluation Board<br>AM180512CEVB

Artasie AM1805
Evaluation Board
AM180512CEVB

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Artasie AM1805
AM1805AQ

Buy

Artasie AM1805
Evaluation Board
AM180512CEVB

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Advanced Timekeeping
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
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 Voltage of the Battery (VBAT)
External interrupt monitor
Programmable low battery detection threshold
Programmable analog voltage comparator

Ultra-Low Power Flexible Serial Peripherals
I²C (up to 400 kHz) serial interface

Wide Operating Range
Operating Voltage: 1.5-3.6 V
Clock and RAM Retention Voltage: 1.5-3.6 V
Operating Temperature: -40°C to 85°C
All inputs include Schmitt Triggers

Applications
Smart Cards
Wireless Sensors and Tags
Medical Electronics
Utility Meters
Data Loggers
Appliances
Handsets
Consumer Electronics
Consumer Equipment

Package Option
3 mm x 3 mm 16-pin QFN package (also available in wafer form)

Ordering Information
AM1805AQ
AM1805I2CEVB (EVB)

Where To Buy

USA

Direct Sales

Artasie Real-Time Clock - AM1805 01

Detailed Functional Block Diagram for Ambiq Artasie RTC - AM1805

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Pin Configuration Diagram for Ambiq Artasie RTC - AM1805

Feature Highlights 02

Specifications 03

Documents 04

Necessary documents

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Where To Buy

USA

Canada

China and Hong Kong

India

Japan

Korea

Southeast Asia

Taiwan

Europe

Global Distributor

Latin America

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