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Product Detailed Parameters
- Description：IC RTC CLK/CALENDAR I2C 16QFN
- Series：-
- Package：Tape & Reel (TR),Cut Tape (CT)
- Mfr：Abracon LLC
- Type：Clock/Calendar
- Features：Alarm, Leap Year, SRAM, Trickle-Charger, Watchdog Timer
- Memory Size：256B
- Time Format：HH:MM:SS:hh
- Date Format：YY-MM-DD-dd
- Interface：I2C, 2-Wire Serial
- Voltage - Supply：1.7V ~ 3.6V
- Voltage - Supply, Battery：1.5V ~ 3.6V
- Current - Timekeeping (Max)：0.17µA ~ 0.22µA @ 1.8V ~ 3V
- Operating Temperature：-40°C ~ 85°C
- Mounting Type：Surface Mount
- Grade：-
- Qualification：-
- Package / Case：16-VFQFN Exposed Pad
- Supplier Device Package：16-QFN (3x3)
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Overview
The Abracon AB1804-T3 is a Real-Time Clock (RTC) integrated circuit featuring power management capabilities, housed in a 16-pin QFN package. It supports I2C serial communication and provides 256 bytes of general-purpose RAM. The device operates within a supply voltage range of 1.7V to 3.6V on VCC and 1.5V to 3.6V on the battery backup input (VBAT). Timekeeping current consumption ranges from 0.17µA to 0.22µA at 1.8V to 3V. It includes features such as alarms, leap year calculation, trickle charging, and watchdog timers, functioning within an operating temperature range of -40°C to 85°C.
Feature Summary
- Integrated 256-byte SRAM for data retention during power loss
- Ultra-low power consumption with timekeeping current as low as 14nA in RC oscillator mode
- Built-in power management including ~1Ω power switch and automatic VBAT switchover
- Supports I2C interface up to 400 kHz
Applications
- Smart cards
- Wireless sensors and tags
- Medical electronics
- Utility meters
- Data loggers
Procurement Notes
Verify that the specific ordering suffix '-T3' corresponds to the Tape & Reel packaging format as indicated by local product fields. Confirm that the component meets RoHS compliance standards before integration into final assemblies. Ensure the host system supports the required I2C protocol for register access.
Selection Notes
Select this model when 256 bytes of non-volatile RAM are required alongside RTC functionality. The AB1804 offers advanced timekeeping features like autocalibration but lacks the external VBAT power switch found in the AB1805 variant. Verify that the application requires the I2C interface rather than SPI, which is available in the AB181x series.
Part Context
The AB1804 belongs to the AB18XX family of real-time clocks developed using Subthreshold Power Optimized Technology (SPOT). This family shares pin compatibility and software registers across variants, differing primarily in memory size, interface type (I2C vs. SPI), and specific power management switches. The AB1804 represents the I2C version with full advanced timekeeping and 256B RAM.
Replacement Considerations
The AB0804 is a software and pin-compatible alternative within the same ecosystem. However, it lacks the integrated power switch and sleep FSM features present in the AB1804. Direct replacement requires verifying if the host system utilizes the power management functions specific to the AB18XX series.
