Overview
The M41T93SMY6F from STMicroelectronics is a low-power serial SPI bus real-time clock (RTC) designed for high accuracy timekeeping and low power consumption. This device features a built-in 32.768 kHz oscillator, which is external crystal-controlled for the QFN16 package and embedded crystal for the SOX18 package. The M41T93SMY6F includes a power sense circuit that automatically switches to a battery supply during power failures, ensuring continuous operation. It supports various functions such as a non-volatile time-of-day clock/calendar, alarm interrupt, watchdog timer, programmable 8-bit counter, and square wave outputs. The device is available in both QFN16 and SOX18 packages, making it versatile for different application needs.
Key Specifications
| Parameter | Value |
|---|---|
| Operating Voltage | 2.0 V to 5.5 V |
| Battery Supply Current | 365 nA |
| Operating Temperature | –40 °C to +85 °C |
| Package Options | QFN16, SOX18 with embedded crystal |
| Interface | SPI bus serial interface (SPI mode 0) |
| Accuracy | ±5 ppm typical after 2 reflows (SOX18) |
| SRAM | 7 bytes of battery-backed user SRAM |
| Counters | Tenths/hundredths of seconds, seconds, minutes, hours, day, date, month, year, and century |
Key Features
- Ultra-low battery supply current of 365 nA
- Factory calibrated accuracy ±5 ppm typical after 2 reflows (SOX18)
- 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)
- RESET (RST) output
- Watchdog timer
- Programmable 8-bit counter/timer
- Battery low flag
- Low operating current of 80 μA
- Oscillator stop detection
- Battery or supercapacitor backup
Applications
The M41T93SMY6F is suitable for a wide range of applications requiring accurate timekeeping and low power consumption. These include:
- Industrial control systems
- Medical devices
- Consumer electronics
- Automotive systems
- IoT devices
- Any system requiring a reliable and accurate real-time clock with battery backup capabilities.
Q & A
- What is the primary function of the M41T93SMY6F?
The primary function of the M41T93SMY6F is to provide a low-power, accurate real-time clock (RTC) with battery backup capabilities.
- What are the package options for the M41T93SMY6F?
The M41T93SMY6F is available in both QFN16 and SOX18 packages, with the SOX18 package including an embedded crystal.
- What is the operating voltage range for the M41T93SMY6F?
The operating voltage range for the M41T93SMY6F is 2.0 V to 5.5 V.
- How accurate is the M41T93SMY6F?
The M41T93SMY6F has a factory calibrated accuracy of ±5 ppm typical after 2 reflows for the SOX18 package.
- What interface does the M41T93SMY6F use?
The M41T93SMY6F uses a SPI bus serial interface, supporting SPI mode 0.
- Does the M41T93SMY6F have any alarm functions?
Yes, the M41T93SMY6F features programmable alarms with interrupt functions, including an optional second programmable alarm.
- What is the battery supply current of the M41T93SMY6F?
The battery supply current of the M41T93SMY6F is 365 nA.
- Does the M41T93SMY6F support watchdog timer and counter functions?
Yes, the M41T93SMY6F includes a watchdog timer and a programmable 8-bit counter/timer.
- How much SRAM does the M41T93SMY6F have?
The M41T93SMY6F has 7 bytes of battery-backed user SRAM.
- What is the operating temperature range of the M41T93SMY6F?
The operating temperature range of the M41T93SMY6F is –40 °C to +85 °C.
