Overview
The M41T82SM6F is a serial I²C bus real-time clock (RTC) produced by STMicroelectronics. This component is part of the M41T8x series, known for its low-power consumption and robust features. The M41T82SM6F is specifically designed for applications requiring precise timekeeping and automatic switchover to a battery supply in case of power failure. It features an external crystal-controlled 32.768 kHz oscillator and is available in an 8-lead SOIC package.
Key Specifications
| Parameter | Value |
|---|---|
| Package | SO-8 |
| Operating Voltage | 2.0 V to 5.5 V |
| Operating Temperature | –40 °C to 85 °C |
| Battery Supply Current | 365 nA |
| Clock Accuracy | ±5 ppm typical after 2 reflows (SOX18) |
| Serial Interface | I²C bus (400 kHz protocol) |
| SRAM | 7 bytes of battery-backed user SRAM |
| RoHS Compliance | Ecopack3 (lead-free components) |
Key Features
- Ultra-low battery supply current of 365 nA
- Factory-calibrated accuracy of ±5 ppm typical after 2 reflows (SOX18)
- Much better accuracies achievable using built-in programmable analog and digital calibration circuits
- Counters for tenths/hundredths of seconds, seconds, minutes, hours, day, date, month, year, and century
- Automatic switchover and reset output circuitry (fixed reference)
- Programmable alarm with interrupt function (valid even during battery backup mode)
- Optional second programmable alarm available
- RESET (RST) output
- Watchdog timer
- Programmable 8-bit counter/timer
- Battery low flag
- Low operating current of 80 µA
- Oscillator stop detection
- Battery or SuperCap™ backup
Applications
The M41T82SM6F is suitable for a variety of applications that require precise timekeeping and low power consumption. These include:
- Industrial control systems
- Medical devices
- Consumer electronics
- Automotive systems
- IoT devices
- Any system requiring a reliable real-time clock with battery backup capabilities
Q & A
- What is the operating voltage range of the M41T82SM6F?
The operating voltage range is 2.0 V to 5.5 V.
- What is the typical battery supply current of the M41T82SM6F?
The typical battery supply current is 365 nA.
- What type of serial interface does the M41T82SM6F support?
The M41T82SM6F supports the I²C bus (400 kHz protocol).
- Does the M41T82SM6F have user SRAM?
Yes, it has 7 bytes of battery-backed user SRAM.
- What is the operating temperature range of the M41T82SM6F?
The operating temperature range is –40 °C to 85 °C.
- Is the M41T82SM6F RoHS compliant?
Yes, it is RoHS compliant with lead-free components (Ecopack3).
- What types of alarms are available on the M41T82SM6F?
The M41T82SM6F has programmable alarms with interrupt functions, including an optional second programmable alarm.
- Does the M41T82SM6F have a watchdog timer?
Yes, it includes a watchdog timer.
- What is the package type of the M41T82SM6F?
The M41T82SM6F is available in an 8-lead SOIC package.
- Can the M41T82SM6F be backed up by a SuperCap™?
Yes, it supports battery or SuperCap™ backup.
