Overview
The M41T00M6F, produced by STMicroelectronics, is a low power serial real-time clock (RTC) with a built-in 32.768 kHz oscillator that is external crystal controlled. This device is designed to provide accurate timekeeping and is particularly useful in applications where power efficiency and reliability are crucial. The M41T00M6F uses eight bytes of RAM for the clock/calendar function, configured in binary-coded decimal (BCD) format. It features a serial interface that supports the I2C bus protocol at 100 kHz, ensuring efficient communication with other ICs.
The device includes a built-in power sense circuit that detects power failures and automatically switches to a battery supply, ensuring continuous operation. It is supplied in an 8-lead plastic small outline package and operates over a temperature range of -40 to 85 °C.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Oscillator Frequency | 32.768 kHz | External crystal controlled |
| Operating Voltage | 2.0 to 5.5 V | |
| Battery Supply Current | Ultra low battery supply current | 0.8 μA (typ at 3 V) |
| Operating Temperature | -40 to 85 °C | |
| Package Type | 8-lead plastic small outline package | |
| Serial Interface | I2C bus protocol | 100 kHz |
| Data Retention Time | Typical data retention time with a 50 mA/h 3 V lithium cell | In excess of 5 years |
Key Features
- Counters for seconds, minutes, hours, day, month, years, and century
- 32 kHz crystal oscillator integrating load capacitance (12.5 pF) for exceptional oscillator stability
- Serial interface supports 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
Applications
The M41T00M6F is suitable for a variety of applications where accurate timekeeping and low power consumption are essential. These include:
- Industrial automation systems
- Medical devices requiring precise timing
- Consumer electronics such as set-top boxes and digital TVs
- Automotive systems where reliable timekeeping is critical
- IoT devices that need to maintain accurate time over long periods
Q & A
- What is the primary function of the M41T00M6F?
The primary function of the M41T00M6F is to provide accurate timekeeping as a serial real-time clock (RTC).
- What is the operating voltage range of the M41T00M6F?
The operating voltage range of the M41T00M6F is 2.0 to 5.5 V.
- How does the M41T00M6F handle power failures?
The M41T00M6F has a built-in power sense circuit that detects power failures and automatically switches to a battery supply to maintain operation.
- What is the typical data retention time of the M41T00M6F with a lithium cell?
The typical data retention time is in excess of 5 years with a 50 mA/h 3 V lithium cell.
- What serial interface does the M41T00M6F support?
The M41T00M6F supports the I2C bus protocol at 100 kHz.
- How does the M41T00M6F compensate for crystal frequency deviations due to temperature?
The M41T00M6F uses software clock calibration to compensate for crystal frequency deviations due to temperature.
- What is the package type of the M41T00M6F?
The M41T00M6F is supplied in an 8-lead plastic small outline package.
- What is the operating temperature range of the M41T00M6F?
The operating temperature range of the M41T00M6F is -40 to 85 °C.
- Does the M41T00M6F support automatic leap year compensation?
- What is the recommended replacement for new designs using the M41T00M6F?
