Overview
The M41T01M6F is a low-power serial real-time clock (RTC) produced by STMicroelectronics. This device features a built-in 32.768 kHz oscillator circuit that works with an external crystal and does not require any load capacitors. It includes a power sense circuit that detects power failures and automatically switches to a battery supply during such events. The M41T01M6F is designed to provide accurate timekeeping and calendar functions, with counters for seconds, minutes, hours, day, date, month, years, and century. It operates within a voltage range of 2.0 to 5.5 V and is supplied in an 8-lead plastic small outline package (SO-8).
Key Specifications
| Parameter | Value |
|---|---|
| Operating Voltage | 2.0 to 5.5 V |
| Operating Current | 300 μA |
| Battery Supply Current | 800 nA |
| Operating Temperature | –40 to 85 °C |
| Package Type | 8-lead SO-8 |
| Communication Interface | I2C, 2-Wire Serial |
| Data Retention Time | > 5 years with a 50 mA/h 3 V lithium cell |
| RoHS Compliance | Ecopack3 |
Key Features
- Counters for seconds, minutes, hours, day, date, month, years, and century
- Software clock calibration
- Automatic switchover and deselect circuitry
- Battery and capacitor backup (battery backup not recommended for 3.0 V applications)
- Automatic leap year compensation
- Ultra-low battery supply current of 800 nA
- Low operating current of 300 μA
- Operating temperature range of –40 to 85 °C
Applications
The M41T01M6F is suitable for a variety of applications where accurate timekeeping and low power consumption are critical. These include:
- Consumer electronics such as smart home devices, wearables, and handheld gadgets
- Industrial control systems and automation
- Medical devices requiring precise timing
- Automotive systems, especially those needing battery backup during power failures
- IoT devices that require real-time clock functions with minimal power consumption
Q & A
- What is the operating voltage range of the M41T01M6F?
The operating voltage range is 2.0 to 5.5 V.
- What type of communication interface does the M41T01M6F use?
The M41T01M6F uses an I2C, 2-Wire Serial communication interface.
- Does the M41T01M6F require load capacitors for the oscillator circuit?
No, the built-in 32.768 kHz oscillator circuit does not need any load capacitors.
- What is the typical data retention time with a lithium cell?
The typical data retention time is in excess of 5 years with a 50 mA/h 3 V lithium cell.
- Is battery backup recommended for 3.0 V applications?
No, battery backup is not recommended for 3.0 V applications; instead, capacitor backup is suggested.
- What is the operating temperature range of the M41T01M6F?
The operating temperature range is –40 to 85 °C.
- Does the M41T01M6F support automatic leap year compensation?
- What is the package type of the M41T01M6F?
The M41T01M6F is supplied in an 8-lead plastic small outline package (SO-8).
- What is the ultra-low battery supply current of the M41T01M6F?
The ultra-low battery supply current is 800 nA.
- What is the low operating current of the M41T01M6F?
The low operating current is 300 μA.
