Overview
The M41T00M6E, produced by STMicroelectronics, is a low-power serial real-time clock (RTC) integrated circuit. Although this specific model is obsolete and no longer manufactured, it remains relevant for understanding the capabilities and features of similar RTCs. The M41T00 series is designed for applications requiring precise timekeeping and low power consumption.
The device features a built-in 32.768 kHz oscillator controlled by an external crystal, ensuring high stability and accuracy. It supports an I2C bus interface for serial communication and includes automatic leap year compensation and software clock calibration to adjust for crystal deviations due to temperature changes.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 2.0 | - | 5.5 | V |
| Ambient Operating Temperature (TA) | -40 | - | 85 | °C |
| Battery Supply Voltage (VBAT) | 2.5 | - | 3.5 | V |
| Battery Supply Current (IBAT) | - | 0.8 | - | μA |
| Supply Current (ICC1) | - | 300 | - | μA |
| RTC Supply Current (ICC2) | - | 70 | - | μA |
| Input Leakage Current (ILI) | - | ±1 | - | μA |
| Output Leakage Current (ILO) | - | ±1 | - | μA |
| Input Low Voltage (VIL) | -0.3 | 0.3 VCC | - | V |
| Input High Voltage (VIH) | 0.7 VCC | - | VCC + 0.5 | V |
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 (12.5 pF) for high oscillator stability.
- Serial interface supporting I2C bus (100 kHz protocol).
- Ultra-low battery supply current of 0.8 μA (typical at 3 V).
- Automatic switchover and deselect circuitry for power failure detection and battery backup.
- Software clock calibration to compensate for crystal deviations due to temperature changes.
- Automatic leap year compensation.
- Operating temperature range of -40 to 85 °C.
- Built-in power sense circuit and automatic switch to battery supply during power failures.
- Data retention time exceeding 5 years with a 50 mA/h 3 V lithium cell.
Applications
- Embedded systems requiring precise timekeeping.
- Industrial control systems.
- Medical devices.
- Automotive systems.
- Consumer electronics such as set-top boxes, DVRs, and smart home devices.
- Any application needing a low-power, accurate real-time clock with battery backup capabilities.
Q & A
- What is the M41T00M6E?
The M41T00M6E is a low-power serial real-time clock (RTC) integrated circuit produced by STMicroelectronics.
- What are the key features of the M41T00M6E?
Key features include counters for time and date, a 32 kHz crystal oscillator, I2C bus interface, ultra-low battery supply current, automatic switchover and deselect circuitry, software clock calibration, and automatic leap year compensation.
- What is the operating voltage range of the M41T00M6E?
The operating voltage range is from 2.0 V to 5.5 V.
- What is the typical battery supply current?
The typical battery supply current is 0.8 μA at 3 V.
- How does the M41T00M6E handle power failures?
The device automatically switches to the battery supply during power failures and powers down into an ultra-low current mode to conserve battery life.
- What is the data retention time with a lithium cell?
The data retention time exceeds 5 years with a 50 mA/h 3 V lithium cell.
- What communication protocol does the M41T00M6E use?
The device uses the I2C bus protocol with a 100 kHz frequency.
- What is the operating temperature range of the M41T00M6E?
The operating temperature range is from -40 °C to 85 °C.
- Is the M41T00M6E still in production?
No, the M41T00M6E is obsolete and no longer manufactured. For new designs, the M41T00S is recommended.
- What package type is the M41T00M6E available in?
The device is supplied in an 8-lead plastic small outline package (SO8).
