AM1805AQ

Overview

The AM1805AQ is a Real-Time Clock (RTC) from the Artasie family, manufactured by Ambiq Micro. It integrates timekeeping with power management capabilities in a 16-pin QFN package. The device supports I2C and SPI interfaces for communication. It operates on a supply voltage of 1.5V to 3.6V and includes features such as alarms, leap year correction, a watchdog timer, and a trickle charger. The unit provides 256 bytes of RAM and maintains time with ultra-low current consumption ranging from 0.17µA to 0.22µA at 1.8V to 3V.

Feature Summary

• Integrated RTC with Power Management: Combines real-time clock functions with system power control features.
• Dual Interface Support: Compatible with both I2C and SPI protocols for flexible system integration.
• Ultra-Low Power Consumption: Timekeeping current is specified between 0.17µA and 0.22µA depending on voltage.
• Comprehensive Feature Set: Includes alarm generation, leap year adjustment, square wave output, supervisor reset, and unique ID storage.

Applications

• Wearable electronics requiring extended battery life
• IoT sensors needing precise time synchronization
• Portable medical devices with strict power constraints
• Smart home appliances with backup power requirements

Procurement Notes

Verify the specific ordering suffix against the manufacturer's latest datasheet to ensure correct packaging options. Confirm that the 16-QFN (3x3) package matches the PCB footprint design. Check for any recent revisions to the Artasie family documentation regarding autocalibration parameters or electrical limits before finalizing procurement.

Selection Notes

Select this component when an application requires simultaneous RTC functionality and power management within a compact form factor. Ensure the system voltage falls within the 1.5V to 3.6V range. Consider the 256-byte RAM capacity for data logging needs. Verify compatibility with the host controller's I2C or SPI interface speeds and voltage levels.

Part Context

The AM1805AQ belongs to the Artasie AM18X5 family, which also includes the AM1815 variant. This family is designed to offer ultra-low power performance coupled with sophisticated feature sets for embedded systems. The 'AQ' suffix typically denotes the commercial temperature grade (-40°C to +85°C) and the specific tape & reel or cut tape packaging configuration.

Replacement Considerations

The AM1815 is a related part within the same Artasie family. Verify functional equivalence regarding pinout and register map before substitution. No other direct cross-model substitutes are confirmed in the provided documentation.

FAQ

What memory capacity does the AM1805AQ provide?

The device includes 256 bytes of RAM for general-purpose data storage.

Does the AM1805AQ support automatic calibration?

Yes, the device features digital calibration for both XT and RC oscillators, along with an autocalibration mode to maintain accuracy.

What types of interrupts are supported?

The AM1805AQ supports Alarm (AIRQ), Countdown Timer (TIRQ), Watchdog Timer (WIRQ), Battery Low (BLIRQ), External (X1IRQ/X2IRQ), Oscillator Fail (OFIRQ), and Autocalibration Fail (ACIRQ) interrupts.