M41T81SMY6F - Brand New STMicroelectronics Real-time Clocks (RTC)
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Description
The M41T81SMY6F is a low power Serial RTC with a built-in 32.768kHz oscillator. It is part of the Real-time Clocks (RTC) product category. The RTC has eight bytes of SRAM for clock/calendar functions, which are configured in binary coded decimal (BCD) format. It also has additional SRAM for status/control of Alarm, Watchdog, and Square Wave functions. The M41T81SMY6F uses a two line, bi-directional I2C interface for serial data transfer. It has a built-in power sense circuit that switches to battery supply during power failures. The clock operations are sustained by a small lithium button supply in case of power failure. The RTC features include a non-volatile time-of-day clock/calendar, Alarm interrupts, Watchdog Timer, and programmable Square Wave output. The clock address locations hold various time units in 24 hour BCD format. The M41T81SMY6F comes in two packaging options, an 8-pin SOIC or an 18-pin (MY), 300mil SOIC package with an embedded 32kHz crystal. The 18-pin, embedded crystal SOIC requires a user-supplied battery for non-volatile operation.
Specifications and Features
- Counters for tenths/hundredths of seconds, seconds, minutes, hours, day, date, month, year, and century
- 32kHz crystal oscillator with integrated load capacitance (12.5pF) for exceptional stability
- Oscillator stop detection to monitor clock operation
- Serial interface supports I2C bus with 400kHz protocol
- Ultra-low battery supply current of 0.6µA (typ)
- 2.0 to 5.5V clock operating voltage
- Automatic switchover and deselect circuitry for full operation in 3.0V applications
- Power-down time stamp to determine time elapsed in battery back-up
- Battery low flag
- Programmable alarm and interrupt function, valid even during Battery Back-up Mode
- Accurate programmable watchdog timer from 62.5ms to 128s
- Software clock calibration to compensate for crystal deviation due to temperature
- Operating temperature of -40 to 85°C
- Package options include an 8-lead SOIC or 18-lead embedded crystal SOIC
Application Scenarios
The M41T81SMY6F can be used in various applications that require accurate timekeeping. It is suitable for devices that need a real-time clock, such as smart home systems, industrial automation, medical devices, and automotive systems. The low power consumption and the ability to operate on a battery backup make it ideal for applications that require continuous time tracking even in case of power failures.
Comparison
Advantages- Low power consumption
- Accurate timekeeping
- Battery backup for power failures
- Wide operating voltage range
- Compact packaging options
Disadvantages- No built-in temperature compensation for crystal deviation
- Limited memory for clock and control functions
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Similar parts: 1405 , Click to view
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Datasheet
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Shopping guide
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Popular parts of the same kind
- Datasheet: Download M41T81SMY6F
- Chipdatas Part: CD93-M41T81SMY6F
- Warehouse: China, Hong Kong
- Dispatch: Within 24 hours
- Free Shipping: Yes
- Prority Shipping: Yes, 3-5 days
- Last Updated: 2024/06/13 04:46 +0800
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- Full Refund if you don't receive your order
- Full or Partial Refund , If the item is not as described
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