AB1801-T3

Overview

The Abracon AB1801-T3 is a Real-Time Clock (RTC) integrated circuit featuring an I2C interface and housed in a 16-VFQFN Exposed Pad package. It operates within a supply voltage range of 1.7V to 3.6V, with battery backup support from 1.5V to 3.6V. The device provides timekeeping functions including counters for hundredths, seconds, minutes, hours, date, month, year, century, and weekday. Key features include alarm capabilities on all counters, automatic leap year calculation, and programmable output clock generation. Timekeeping current consumption ranges from 0.17µA to 0.22µA at 1.8V to 3V.

Feature Summary

• I2C serial interface supporting up to 400 kHz bus speed
• Integrated power management with ~1 Ω power switch for off-chip components
• Supercapacitor trickle charger with programmable charging current
• Automatic switchover to VBAT upon main power loss

Applications

• Smart cards
• Wireless sensors and tags
• Medical electronics
• Utility meters
• Data loggers

Procurement Notes

Verify the specific suffix '-T3' corresponds to the Tape & Reel packaging format as indicated in local product fields. Confirm that the component matches the AB18XX family specifications regarding the absence of general-purpose RAM and external reset outputs, which distinguishes it from higher-end variants like the AB1804 or AB1815.

Selection Notes

Select the AB1801-T3 when system design requires baseline timekeeping with advanced power management but does not necessitate onboard RAM storage or multiple interrupt outputs. Ensure the host controller supports I2C communication. Verify that the application environment stays within the -40°C to +85°C operating temperature range for optimal performance.

Part Context

The AB1801 belongs to the AB18XX series of ultra-low power RTCs utilizing Subthreshold Power Optimized Technology (SPOT). Unlike the AB08XX series, the AB18XX family integrates sophisticated power management features such as a system sleep manager and an integrated power switch. This part specifically lacks the general-purpose RAM found in other family members, focusing instead on timekeeping and power control functions.

Replacement Considerations

The AB0801 is a software and pin-compatible alternative within the same family but lacks the integrated power switch and sleep manager features of the AB1801. Other AB18XX variants such as the AB1803 or AB1804 offer additional RAM or interrupt outputs but maintain pin compatibility.