Overview
The M41T82RM6F is a low-power serial I²C real-time clock (RTC) produced by STMicroelectronics. This component is part of the M41T8x family, which features a built-in 32.768 kHz oscillator. The M41T82RM6F is specifically available in an 8-lead SOIC package and requires an external crystal for operation. It is designed to provide accurate time-keeping with automatic switchover to a battery supply in case of a power failure, ensuring continuous operation.
The device includes a range of functions such as a non-volatile time-of-day clock/calendar, two alarm interrupts, a watchdog timer, a programmable 8-bit counter, and square wave outputs. It also offers 7 bytes of battery-backed user SRAM and supports I²C bus communication at 400 kHz.
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 |
| Accuracy | ±5 ppm typical after 2 reflows (SOX18) |
| I²C Bus Frequency | 400 kHz |
| NVRAM Size | 7 bytes |
| RoHS Compliance | Lead-free, compliant with RoHS directive |
Key Features
- Ultra-low battery supply current of 365 nA
- Factory-calibrated accuracy of ±5 ppm typical after 2 reflows (SOX18)
- Programmable analog and digital calibration circuits for better accuracy
- Counters for tenths/hundredths of seconds, seconds, minutes, hours, day, date, month, year, and century
- Automatic switchover and reset output circuitry
- Programmable alarm with interrupt function (valid even during battery backup mode)
- Optional second programmable alarm available
- Watchdog timer and programmable 8-bit counter/timer
- 7 bytes of battery-backed user SRAM
- Battery low flag and oscillator stop detection
- Battery or SuperCap™ backup
Applications
The M41T82RM6F is suitable for a variety of applications requiring accurate time-keeping and low power consumption. These include:
- Embedded systems and IoT devices
- Industrial control systems
- Medical devices and healthcare equipment
- Automotive systems and telematics
- Consumer electronics and smart home devices
Q & A
- What is the operating voltage range of the M41T82RM6F?
The operating voltage range is 2.0 V to 5.5 V.
- What is the typical battery supply current of the M41T82RM6F?
The typical battery supply current is 365 nA.
- What is the accuracy of the M41T82RM6F after 2 reflows?
The accuracy is ±5 ppm typical after 2 reflows (SOX18 package).
- Does the M41T82RM6F support I²C bus communication?
Yes, it supports I²C bus communication at 400 kHz.
- What is the operating temperature range of the M41T82RM6F?
The operating temperature range is –40 °C to 85 °C.
- Does the M41T82RM6F have battery-backed SRAM?
Yes, it has 7 bytes of battery-backed user SRAM.
- Is the M41T82RM6F RoHS compliant?
Yes, it is lead-free and compliant with the RoHS directive.
- What types of alarms does the M41T82RM6F support?
It supports programmable alarms with interrupt functions, including an optional second programmable alarm.
- Does the M41T82RM6F have a watchdog timer?
Yes, it includes a watchdog timer and a programmable 8-bit counter/timer.
- How does the M41T82RM6F handle power failures?
It automatically switches to the battery supply in case of a power failure.
