Overview
The M41T82ZM6F 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 M41T82ZM6F 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 ultra-low power consumption, making it suitable for battery-powered devices.
The device includes a non-volatile, time-of-day clock/calendar, two alarm interrupts, a watchdog timer, a programmable 8-bit counter, and square wave output functions. It also features automatic switchover to a battery supply in case of power failure, ensuring continuous operation.
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 |
| Operating Current | 80 µA |
| Frequency Accuracy | ±5 ppm typical after 2 reflows (SOX18) |
| Interface | I²C bus (400 kHz protocol) |
| User SRAM | 7 bytes battery-backed |
| 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)
- 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
- Watchdog timer and programmable 8-bit counter/timer
- Battery low flag and oscillator stop detection
- Battery or SuperCap™ backup
Applications
The M41T82ZM6F is suitable for a variety of applications requiring accurate time-keeping and low power consumption. These include:
- Battery-powered devices such as wearables, IoT devices, and portable electronics
- Industrial control systems and automation
- 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 M41T82ZM6F?
The operating voltage range is 2.0 V to 5.5 V.
- What is the typical battery supply current of the M41T82ZM6F?
The typical battery supply current is 365 nA.
- What interface does the M41T82ZM6F use for data transfer?
The device uses an I²C bus interface with a 400 kHz protocol.
- Does the M41T82ZM6F have user SRAM?
Yes, it has 7 bytes of battery-backed user SRAM.
- What are the package options for the M41T82ZM6F?
The M41T82ZM6F is available in an 8-lead SOIC package.
- Is the M41T82ZM6F RoHS compliant?
Yes, it is RoHS compliant with lead-free components (Ecopack3).
- What is the operating temperature range of the M41T82ZM6F?
The operating temperature range is –40 °C to 85 °C.
- Does the M41T82ZM6F support multiple alarms?
Yes, it supports two programmable alarms with interrupt functions.
- What additional functions does the M41T82ZM6F provide?
It includes a watchdog timer, programmable 8-bit counter/timer, and square wave output functions.
- How does the M41T82ZM6F handle power failures?
The device automatically switches to the battery supply in case of a power failure.
