Overview
The M41T00SM6E is a serial real-time clock (RTC) produced by STMicroelectronics. This component is designed to provide accurate timekeeping and calendar functions in a variety of applications. It features a built-in 32.768 kHz oscillator controlled by an external crystal, ensuring high stability and low power consumption. The device supports an I2C bus interface for serial communication and operates within a voltage range of 2.0 to 5.5 V. It also includes automatic leap year compensation, software clock calibration, and a power sense circuit that switches to a battery supply during power failures.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 2.0 | 5.5 | V | |
| Ambient Operating Temperature (TA) | -40 | 85 | °C | |
| Resonant Frequency (fO) | 32.768 | kHz | ||
| Series Resistance (RS) | 60 | kΩ | ||
| Load Capacitance (CL) | 12.5 | pF | ||
| Battery Supply Current (typ at 3 V) | 0.8 | μA | ||
| Input Capacitance (CIN) on SCL | 7 | pF | ||
| Output Capacitance (COUT) on SDA, FT/OUT | 10 | pF |
Key Features
- Counters for seconds, minutes, hours, day, month, years, and century in binary-coded decimal (BCD) format.
- 32 kHz crystal oscillator with integrated load capacitance for high stability.
- Serial interface supporting I2C bus (100 kHz protocol).
- Ultra-low battery supply current of 0.8 μA (typ at 3 V).
- Automatic switchover and deselect circuitry for power failure detection.
- Software clock calibration to compensate for crystal deviation due to temperature.
- Automatic leap year compensation.
- Operating temperature range of -40 to 85 °C.
- Power sense circuit for automatic switching to battery supply during power failures.
Applications
The M41T00SM6E is suitable for a wide range of applications requiring accurate timekeeping, including:
- Industrial control systems.
- Medical devices.
- Automotive systems.
- Consumer electronics.
- IoT devices.
- Data loggers and monitoring systems.
Q & A
- What is the operating voltage range of the M41T00SM6E?
The M41T00SM6E operates within a voltage range of 2.0 to 5.5 V. - What type of interface does the M41T00SM6E use for serial communication?
The M41T00SM6E uses an I2C bus interface for serial communication. - What is the typical battery supply current of the M41T00SM6E?
The typical battery supply current is 0.8 μA at 3 V. - Does the M41T00SM6E support automatic leap year compensation?
Yes, the M41T00SM6E supports automatic leap year compensation. - What is the operating temperature range of the M41T00SM6E?
The operating temperature range is -40 to 85 °C. - How does the M41T00SM6E handle power failures?
The M41T00SM6E has a power sense circuit that automatically switches to a battery supply during power failures. - Can the M41T00SM6E be calibrated for better accuracy?
Yes, the M41T00SM6E supports software clock calibration to compensate for crystal deviation due to temperature. - What type of package is the M41T00SM6E available in?
The M41T00SM6E is available in an 8-lead plastic small outline package (SO8). - What is the resonant frequency of the crystal oscillator in the M41T00SM6E?
The resonant frequency of the crystal oscillator is 32.768 kHz. - How long can the M41T00SM6E retain data with a lithium coin cell?
The typical data retention time is in excess of 5 years with a 50 mA/h 3 V lithium cell.
