AB1803-T3

Overview

The AB1803-T3 is a Real-Time Clock (RTC) integrated circuit from Abracon LLC, part of the AB18XX family. It features an I2C interface and provides baseline timekeeping with counters for hundredths, seconds, minutes, hours, date, month, year, century, and weekday. The device includes alarm capabilities on all counters, automatic leap year calculation, and up to 64 bytes of general-purpose RAM. It operates within a voltage range of 1.5V to 3.6V and supports an operating temperature range of -40°C to 85°C. Key power management features include an integrated ~1 Ω power switch for off-chip components, system sleep manager, external reset signal monitor, supercapacitor trickle charger, and automatic switchover to VBAT.

Feature Summary

• I2C serial interface (up to 400 kHz)
• Up to 64 bytes of general-purpose RAM
• Integrated ~1 Ω power switch for host MCU control
• Supercapacitor trickle charger with programmable charging current

Applications

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

Procurement Notes

Verify the specific package type (Tape & Reel or Cut Tape) as indicated by the suffix in procurement documentation. Confirm that the selected variant matches the required memory size and interface specifications for the target application design.

Selection Notes

Select the AB1803-T3 when I2C communication is required alongside advanced power management features such as the integrated power switch and supercapacitor charging. Ensure the system design accommodates the 16-pin QFN-16 package dimensions and thermal pad requirements for proper heat dissipation and electrical connection.

Part Context

The AB1803-T3 belongs to the AB18XX series of ultra-low power RTCs with power management. This family utilizes Subthreshold Power Optimized Technology (SPOT) CMOS platform to achieve minimal power consumption. The AB1803 specifically offers 64 bytes of RAM and I2C interface, distinguishing it from other members like the AB1801 (0 bytes RAM) or AB1804 (256 bytes RAM).

Replacement Considerations

For pin-compatible alternatives within the same software and hardware ecosystem, consider the AB0803-T3. Note that the AB0803 lacks the integrated power switch and supercapacitor trickle charger found in the AB1803.