Low-power serial real-time clock (RTC) with built-in battery switchover circuit The M41T01 is a serial real-time clock (RTC) manufactured by STMicroelectronics. Below are its specifications, descriptions, and features based on factual information from Ic-phoenix technical data files:

### **Specifications:**
- **Interface:** I²C (Inter-Integrated Circuit) serial interface.
- **Operating Voltage:** 2.7V to 5.5V.
- **Timekeeping Current:** Typically 400nA at 3V.
- **Clock Accuracy:** ±2ppm from 0°C to +40°C (±1ppm typical).
- **Temperature Range:** -40°C to +85°C.
- **Package Options:** 8-pin SOIC (Small Outline Integrated Circuit).
- **Memory:** 56 bytes of general-purpose SRAM.
- **Clock Frequency:** 32.768 kHz (crystal oscillator).
- **Battery Backup:** Supports battery backup operation (1.3V to 5.5V).

### **Descriptions:**
- The M41T01 is a low-power serial RTC designed for timekeeping applications.
- It provides seconds, minutes, hours, day, date, month, and year information with automatic leap-year compensation.
- The device includes a built-in power-sense circuit that detects power failures and automatically switches to battery backup.
- It is commonly used in embedded systems, industrial controls, and consumer electronics.

### **Features:**
- **Low Power Consumption:** Ultra-low standby current for battery-powered applications.
- **I²C Interface:** Allows easy communication with microcontrollers.
- **Battery Backup:** Maintains timekeeping during power loss.
- **Programmable Alarm:** Can trigger an interrupt at a specified time.
- **Automatic Leap-Year Compensation:** Valid up to the year 2099.
- **Power-Fail Detection:** Monitors VCC and switches to backup supply if needed.
- **56-Byte SRAM:** For additional data storage.
- **Industrial Temperature Range:** Suitable for harsh environments.

This information is based on STMicroelectronics' official documentation for the M41T01. For detailed electrical characteristics and application notes, refer to the datasheet.

Low-power serial real-time clock (RTC) with built-in battery switchover circuit