Artasie Real-Time Clock - AM0805 01

Artasie RTC AM0805 AM0805AQ (Back)

The Ambiq Artasie Real-Time Clock AM0805 provides a ground-breaking 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 SPOTTM (Subthreshold Power Optimized Technology) CMOS platform.

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Artasie RTC AM0805 AM0805AQ Drawing
Artasie RTC AM0805 AM0805AQ (Back)

Detailed Functional Block Diagram for Ambiq Artasie RTC - AM0805

Detailed Functional Block Diagram for Ambiq Artasie RTC - AM0805
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The AM0805 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.

Pin Configuration Diagram for Ambiq Artasie RTC - AM0805

Pin Configuration Diagram for Ambiq Artasie RTC - AM0805

Features Highlights 02

Full-Function RTC

Serves as a full function RTC for host processors such as microcontrollers.

3 Distinct Feature Groups

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

Advanced Timekeeping

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

Proprietary Calibration Algorithm

A proprietary calibration algorithm allows the AM0805 to digitally tune the RC oscillator frequency and the XT oscillator frequency with accuracy as low as 2 ppm at a given temperature.

Power Management

Power management features built into the AM0805 enable it to operate as a backup device in both linepowered and battery-powered systems.


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




Advanced Timekeeping

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

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


Smart Cards

Wireless Sensors and Tags

Medical Electronics

Utility Meters

Data Loggers



Consumer Electronics

Consumer Equipment

Package Option

3 mm x 3 mm 16-pin QFN package

Ordering Information



Typical Application Circuit for AM0805
Typical Application Circuit for AM0805

*Total battery series impedance = 1.5k ohms, which may require an external resistor

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Documents 04

Where To Buy 05


Fujitsu Electronics Pacific Asia Limited Singapore Branch

[email protected]

Southeast Asia


[email protected]

Fujitsu Electronics Pacific Asia Limited Singapore Branch

[email protected]

China and Hong Kong

Direct Sales

[email protected]


Fujitsu Electronics Inc (FEI)

[email protected]


[email protected]


Direct Sales

[email protected]

TOP-electronics USA

[email protected]


Direct Sales

[email protected]


Direct Sales

[email protected]

Sechang Semicon Co., Ltd. – Sales Representative

[email protected]