AB1814-T3

Overview

The Abracon AB1814-T3 is a Real-Time Clock (RTC) IC featuring an SPI serial interface and integrated power management capabilities. It operates within a supply voltage range of 1.7V to 3.6V, with timekeeping current consumption ranging from 0.17µA to 0.22µA at 1.8V to 3V. The device includes 256 bytes of general-purpose RAM, supports HH:MM:SS:hh time format and YY-MM-DD-dd date format, and functions in temperatures from -40°C to 85°C. Packaged in a 16-VFQFN Exposed Pad (3x3 mm), it offers alarm, leap year, trickle-charger, and watchdog timer features.

Feature Summary

• SPI Interface: Supports up to 2 MHz for high-speed communication.
• Power Management: Includes ~1 Ω power switch, system sleep manager, and automatic VBAT switchover.
• Advanced Timekeeping: Features RC oscillator with autocalibration (±16 ppm) and XT mode (±2 ppm).
• Memory & Timers: Contains 256B SRAM, programmable alarms, countdown timers, and a hardware reset watchdog.

Applications

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

Procurement Notes

Verify the specific suffix '-T3' against official documentation to confirm packaging details such as Tape & Reel or Cut Tape quantities. Ensure the selected variant matches the required SPI interface, as I2C versions exist within the same family. Confirm RoHS compliance status directly with the manufacturer's latest datasheet revision.

Selection Notes

Select the AB1814-T3 when an SPI interface is preferred over I2C for system integration. This model provides 256 bytes of RAM and advanced power management features including a power switch and sleep FSM. Verify that the host controller supports the required SPI clock speeds and that the 1.7V to 3.6V operating voltage aligns with the system power rails.

Part Context

The AB1814 belongs to the AB18XX series, which utilizes Subthreshold Power Optimized Technology (SPOT) CMOS. This family combines ultra-low power RTC functions with sophisticated power management, allowing the device to act as a supervisory component for host microcontrollers by managing wake/sleep states and backup power switching.

Replacement Considerations

The AB0814 is a software and pin-compatible alternative within the AB08XX family but lacks the integrated power switch and sleep FSM found in the AB1814. When substituting, verify if the host system requires the active power management features unique to the AB18XX series.