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Product Detailed Parameters
- Description：IC RTC CLK/CALENDAR SPI 16QFN
- Series：-
- Package：Tape & Reel (TR),Cut Tape (CT)
- Mfr：Abracon LLC
- Type：Clock/Calendar
- Features：Alarm, Leap Year, Trickle-Charger
- Memory Size：-
- Time Format：HH:MM:SS:hh
- Date Format：YY-MM-DD-dd
- Interface：SPI
- 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 AB1811-T3 is a Real-Time Clock (RTC) IC featuring an SPI serial interface and 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 in HH:MM:SS:hh format and supports YY-MM-DD-dd date formats. Key features include alarm capabilities, leap year calculation, and a trickle charger. Timekeeping current consumption ranges from 0.17µA to 0.22µA at 1.8V to 3V. It functions reliably across an operating temperature range of -40°C to 85°C.
Feature Summary
- SPI Interface: Supports up to 2 MHz data rate for communication with host controllers.
- Ultra-Low Power: Features baseline timekeeping with RC oscillator modes consuming as low as 14 nA.
- Power Management: Includes integrated power switch (~1 Ω), system sleep manager, and automatic switchover to VBAT.
- Timekeeping Functions: Provides alarms on all counters, programmable clock generation, countdown timer, and automatic leap year calculation.
Applications
- Smart cards
- Wireless sensors and tags
- Medical electronics
- Utility meters
- Data loggers
Procurement Notes
Verify the specific suffix '-T3' against manufacturer documentation to confirm packaging details such as Tape & Reel or Cut Tape specifications. Ensure the selected variant matches the required SPI interface configuration, as I2C variants exist within the same family. Confirm RoHS compliance status through official datasheets before procurement.
Selection Notes
Select the AB1811-T3 when SPI connectivity is required instead of I2C. This model lacks general-purpose RAM found in higher-tier AB181x parts. Evaluate power requirements; if ultra-low standby current is critical, utilize the RC oscillator mode. Ensure the host system can accommodate the 16-pin QFN-16 package dimensions of 3x3 mm.
Part Context
The AB1811 belongs to the AB18XX Real-Time Clock with Power Management family. It is software and pin compatible with other members like the AB1801 and AB1813, though feature sets vary. The series utilizes Subthreshold Power Optimized Technology (SPOT) CMOS platform for minimal power consumption.
Replacement Considerations
AB1801-T3 offers identical functionality but uses an I2C interface instead of SPI. AB1813-T3 provides additional 64 bytes of general-purpose RAM while maintaining the SPI interface. Verify pin compatibility and register mapping differences when substituting these components.
FAQ
What is the maximum SPI clock speed for the AB1811?
The AB1811 supports SPI bus speeds up to 2 MHz.
Does the AB1811 include general-purpose RAM?
No, the AB1811 does not include general-purpose RAM. Models like the AB1813 and AB1815 provide 64B and 256B of RAM, respectively.
How does the device handle power loss?
The AB1811 automatically switches to VBAT power when VCC falls below a threshold, ensuring continuous timekeeping and data retention.
