Overview
The M41T00S, although the specific part number M41T00SC64MY6E is listed as obsolete, is a low-power serial real-time clock (RTC) produced by STMicroelectronics. This component is designed to provide accurate timekeeping and calendar functions. It features a built-in 32.768 kHz oscillator controlled by an external crystal and supports an I²C bus interface for serial communication. The device is particularly useful in applications requiring precise time and date tracking, with automatic adjustments for leap years and different month lengths.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Supply Voltage (VCC) | Operating voltage range | 2.7 to 5.5 V |
| Operating Temperature | Ambient operating temperature range | -40 to 85 °C |
| Serial Interface | Type and speed | I²C bus (400 kHz protocol) |
| Operating Current | Typical operating current | 300 µA |
| Battery Backup Current | Ultra-low battery supply current | 0.6 µA |
| Package Type | Physical package | 8-pin SOIC |
| Oscillator Frequency | Frequency of the built-in oscillator | 32.768 kHz |
| Power Sense Circuit | Automatic switchover to battery supply | Yes |
| Software Clock Calibration | Ability to calibrate the clock software-wise | Yes |
Key Features
- Counters for seconds, minutes, hours, day, date, month, year, and century in BCD format.
- Software clock calibration.
- Automatic switchover and deselect circuitry (fixed reference).
- Low operating current of 300 µA and ultra-low battery supply current of 0.6 µA.
- Oscillator stop detection and battery or SuperCapTM backup.
- Serial interface supports I²C bus (400 kHz protocol).
- Operating temperature range of -40 to 85 °C.
- Built-in power sense circuit for automatic switching to battery supply during power failures.
Applications
The M41T00S is suitable for a variety of applications that require precise time and date tracking, including:
- Consumer electronics such as clocks, timers, and calendar devices.
- Industrial control systems and automation.
- Medical devices and equipment.
- Aerospace and defense systems.
- Automotive systems, especially those requiring accurate timekeeping for logging and diagnostic purposes.
Q & A
- What is the operating voltage range of the M41T00S?
The operating voltage range of the M41T00S is 2.7 to 5.5 V.
- What type of serial interface does the M41T00S support?
The M41T00S supports an I²C bus interface with a speed of up to 400 kHz.
- How does the M41T00S handle power failures?
The M41T00S has a built-in power sense circuit that automatically switches to the battery supply when the main power (VCC) falls below a certain threshold.
- What is the typical operating current of the M41T00S?
The typical operating current of the M41T00S is 300 µA.
- Can the M41T00S be calibrated software-wise?
Yes, the M41T00S supports software clock calibration.
- What is the package type of the M41T00S?
The M41T00S is supplied in an 8-pin SOIC package.
- How does the M41T00S handle leap years and different month lengths?
The M41T00S automatically corrects for leap years and different month lengths up to the year 2100.
- What is the frequency of the built-in oscillator in the M41T00S?
The frequency of the built-in oscillator is 32.768 kHz.
- Does the M41T00S have oscillator stop detection?
Yes, the M41T00S has oscillator stop detection and can stop the oscillator to reduce current drain if needed.
- What is the ultra-low battery supply current of the M41T00S?
The ultra-low battery supply current of the M41T00S is 0.6 µA.
