Overview
The M41T00SM6F is a low-power serial real-time clock (RTC) produced by STMicroelectronics. It features a built-in 32.768 kHz oscillator that is external crystal controlled. This device is designed to provide accurate timekeeping with minimal power consumption, making it suitable for a variety of applications where reliable timing is crucial.
The M41T00SM6F includes eight bytes of SRAM dedicated to the clock/calendar function, configured in binary coded decimal (BCD) format. It supports a two-line, bidirectional I²C interface for serial data transfer. The device also includes a built-in power sense circuit that automatically switches to a battery supply during power failures, ensuring continuous operation.
Key Specifications
| Parameter | Specification |
|---|---|
| Operating Voltage | 2.0 to 5.5 V |
| Counters | Seconds, minutes, hours, day, date, month, year, and century |
| Software Clock Calibration | Available |
| Serial Interface | I²C bus (400 kHz protocol) |
| Operating Current | 300 μA |
| Oscillator Stop Detection | Yes |
| Battery or SuperCap™ Backup | Yes |
| Operating Temperature | -40 to 85 °C |
| Battery Supply Current | 0.6 μA |
| Package Type | 8-pin SOIC |
Key Features
- Low-power operation with an operating current of 300 μA and ultra-low battery supply current of 0.6 μA
- Automatic switchover and deselect circuitry for seamless transition between main power and battery backup
- Software clock calibration to enhance accuracy
- Oscillator stop detection to ensure reliable operation
- Support for I²C bus with a 400 kHz protocol for efficient serial communication
- Operating temperature range of -40 to 85 °C, making it suitable for various environmental conditions
- Built-in power sense circuit to detect power failures and switch to battery supply automatically
- Corrections for 28, 29 (leap year), 30, and 31 day months are made automatically
Applications
- Embedded systems requiring accurate timekeeping
- Industrial control systems
- Medical devices
- Aerospace and defense applications
- Consumer electronics such as smart home devices and wearables
- Automotive systems where reliable timing is essential
Q & A
- What is the operating voltage range of the M41T00SM6F?
The operating voltage range is 2.0 to 5.5 V.
- What type of serial interface does the M41T00SM6F support?
The M41T00SM6F supports the I²C bus with a 400 kHz protocol.
- How does the M41T00SM6F handle power failures?
The device has a built-in power sense circuit that automatically switches to a battery supply during power failures.
- What is the operating temperature range of the M41T00SM6F?
The operating temperature range is -40 to 85 °C.
- Does the M41T00SM6F support software clock calibration?
Yes, the device supports software clock calibration to enhance accuracy.
- What type of package is the M41T00SM6F available in?
The M41T00SM6F is available in an 8-pin SOIC package.
- How does the M41T00SM6F manage leap years?
The device automatically corrects for leap years (valid until year 2100) and other month lengths.
- What is the battery supply current of the M41T00SM6F?
The battery supply current is 0.6 μA.
- Does the M41T00SM6F have oscillator stop detection?
Yes, the device has oscillator stop detection to ensure reliable operation.
- What is the purpose of the calibration register in the M41T00SM6F?
The calibration register is used to adjust the clock accuracy, improving it to better than ±2 ppm at 25°C when properly employed.
