Overview
The M41T83SQA6F is a serial I²C bus real-time clock (RTC) produced by STMicroelectronics. This component is part of the M41T8x family, known for its low-power consumption and robust features. The M41T83SQA6F integrates a 32.768 kHz oscillator, which can be either external crystal-controlled or embedded, depending on the package. It provides a comprehensive set of time-keeping functions, including a non-volatile clock/calendar, alarms, watchdog timer, and square wave outputs. The device is designed to automatically switch to a battery supply during power failures, ensuring continuous operation.
Key Specifications
| Parameter | Value |
|---|---|
| Operating Voltage (VCC) | 3.00 V to 5.50 V (M41T83S) |
| Battery Supply Current | 365 nA |
| Accuracy | ±5 ppm typical after 2 reflows (SOX18) |
| Operating Temperature | –40 °C to 85 °C |
| Package Options | 16-lead QFN, 18-lead SOIC with embedded crystal |
| Serial Interface | I²C bus (400 kHz protocol) |
| NVRAM Size | 7 bytes |
| RoHS Compliance | Lead-free components 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 (fixed reference)
- Programmable alarm with interrupt function (valid even during battery backup mode)
- Optional second programmable alarm available
- Square wave output defaults to 32 KHz on power-up (M41T83 only)
- RESET (RST) output
- Watchdog timer
- Programmable 8-bit counter/timer
- 7 bytes of battery-backed user SRAM
- Battery low flag
- Low operating current of 80 μA
- Oscillator stop detection
- Battery or SuperCap™ backup
Applications
The M41T83SQA6F is suitable for a variety of applications requiring precise time-keeping and low power consumption. These include:
- Industrial control systems
- Medical devices
- Automotive systems
- Consumer electronics
- IoT devices
- Any system requiring a reliable and accurate real-time clock with backup capabilities
Q & A
- What is the operating voltage range for the M41T83SQA6F?
The operating voltage range for the M41T83S is 3.00 V to 5.50 V.
- What is the battery supply current of the M41T83SQA6F?
The battery supply current is 365 nA.
- What is the accuracy of the M41T83SQA6F after reflows?
The accuracy is ±5 ppm typical after 2 reflows for the SOX18 package.
- What are the package options for the M41T83SQA6F?
The package options include a 16-lead QFN and an 18-lead SOIC with an embedded crystal.
- Does the M41T83SQA6F support I²C communication?
- What is the NVRAM size of the M41T83SQA6F?
The NVRAM size is 7 bytes.
- Is the M41T83SQA6F RoHS compliant?
- What are the key features of the programmable alarms in the M41T83SQA6F?
The alarms are programmable with interrupt functions and are valid even during battery backup mode. An optional second programmable alarm is also available.
- Does the M41T83SQA6F have a watchdog timer?
- What is the operating temperature range of the M41T83SQA6F?
