Overview
The M41T56M6F is a low-power, serial real-time clock (RTC) produced by STMicroelectronics. This component integrates a 32,768 Hz crystal oscillator and provides 56 bytes of non-volatile RAM (NVRAM). It is designed to offer high oscillator stability and automatic power-fail detection, switching to a battery supply during power failures. The device operates as a slave on an I2C bus, supporting a 100 kHz protocol, and is packaged in an 8-lead, 150-mil, plastic SOIC (SO8).
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Oscillator Frequency | External crystal controlled | 32,768 Hz |
| Load Capacitance | Integrated load capacitance | 12.5 pF |
| Supply Voltage | VCC | 5 V ±10% |
| Battery Supply Current | Typical at 3 V | 450 nA |
| Operating Temperature | –40 °C to 85 °C | |
| Package Type | 8-lead plastic SOIC (SO8) | |
| Serial Interface | I2C bus (100 kHz protocol) | |
| NVRAM | General purpose RAM | 56 bytes |
| Timekeeping Voltage | Down to 2.5 V |
Key Features
- Low-power operation with ultra-low battery supply current of 450 nA (typ at 3 V).
- Automatic power-fail detect and switch circuitry to battery supply during power failures.
- Software clock calibration to compensate for crystal deviation due to temperature.
- Automatic leap year compensation.
- Integrated 32,768 Hz oscillator with load capacitance (12.5 pF) for exceptional oscillator stability.
- I2C bus interface supporting 100 kHz protocol.
- 56 bytes of general purpose NVRAM.
- Counters for seconds, minutes, hours, day, date, month, years, and century in binary coded decimal (BCD) format).
- RoHS compliant – Lead-free second level interconnect).
Applications
The M41T56M6F is suitable for a variety of applications requiring precise timekeeping and low power consumption. These include:
- Consumer electronics such as clocks, watches, and other time-keeping devices.
- Industrial control systems and automation.
- Medical devices requiring accurate time and date tracking.
- Automotive systems for logging and timing functions.
- IoT devices that need to maintain time accurately over long periods.
Q & A
- What is the primary function of the M41T56M6F?
The M41T56M6F is a low-power, serial real-time clock (RTC) with integrated NVRAM and automatic power-fail detection.
- What type of oscillator does the M41T56M6F use?
The M41T56M6F uses a 32,768 Hz crystal oscillator with integrated load capacitance (12.5 pF).
- What is the typical battery supply current of the M41T56M6F?
The typical battery supply current is 450 nA at 3 V.
- What is the operating temperature range of the M41T56M6F?
The operating temperature range is –40 °C to 85 °C.
- What type of package does the M41T56M6F come in?
The M41T56M6F is packaged in an 8-lead plastic SOIC (SO8).
- Does the M41T56M6F support any serial interface?
Yes, it supports the I2C bus interface with a 100 kHz protocol.
- How much NVRAM does the M41T56M6F have?
The M41T56M6F has 56 bytes of general purpose NVRAM.
- What happens during a power failure?
The device automatically switches to the battery supply during power failures.
- Is the M41T56M6F RoHS compliant?
Yes, the M41T56M6F is RoHS compliant and lead-free.
- How does the M41T56M6F handle leap years?
The device includes automatic leap year compensation.
