Overview
The M41T93ZQA6F is a low-power serial SPI bus real-time clock (RTC) produced by STMicroelectronics. This component is designed to provide accurate time-keeping with a built-in 32.768 kHz oscillator, which can be either external crystal-controlled for the QFN16 package or embedded crystal for the SOX18 package. It features automatic switchover to a battery or supercapacitor backup during power failures, ensuring continuous operation. The M41T93ZQA6F is suitable for a wide range of applications requiring precise time and date tracking, including industrial, consumer, and automotive sectors.
Key Specifications
| Parameter | Value |
|---|---|
| Operating Voltage | 2.38 V to 5.50 V |
| Battery Supply Current | 365 nA |
| Factory Calibrated Accuracy | ±5 ppm typical after 2 reflows |
| Operating Temperature | –40 °C to +85 °C |
| Package Options | 16-lead QFN, 18-lead embedded crystal SOIC (SOX18) |
| Serial Interface | SPI bus (supports SPI mode 0 [CPOL = 0, CPHA = 0]) |
| Counters | Tenths/hundredths of seconds, seconds, minutes, hours, day, date, month, year, and century |
| Alarm Functions | Programmable alarm with interrupt function, optional 2nd programmable alarm |
| Additional Features | Square wave output, RESET (RST) output, watchdog timer, programmable 8-bit counter/timer, 7 bytes of battery-backed user SRAM |
Key Features
- Ultra-low battery supply current of 365 nA
- Factory calibrated accuracy ±5 ppm typical after 2 reflows (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
- Compatible with SPI bus serial interface (supports SPI mode 0 [CPOL = 0, CPHA = 0])
- Programmable alarm with interrupt function (valid even during battery backup mode) and optional 2nd programmable alarm
- Square wave output (defaults to 32 KHz on power-up)
- 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 supercapacitor backup
Applications
The M41T93ZQA6F is versatile and can be used in various applications, including:
- Industrial automation and control systems
- Consumer electronics such as smart home devices and appliances
- Automotive systems requiring precise time-keeping
- Medical devices and healthcare equipment
- IoT devices and smart sensors
Q & A
- What is the operating voltage range of the M41T93ZQA6F?
The operating voltage range is 2.38 V to 5.50 V. - What is the typical battery supply current of the M41T93ZQA6F?
The typical battery supply current is 365 nA. - What is the factory calibrated accuracy of the M41T93ZQA6F?
The factory calibrated accuracy is ±5 ppm typical after 2 reflows. - What are the package options available for the M41T93ZQA6F?
The package options include a 16-lead QFN and an 18-lead embedded crystal SOIC (SOX18). - Does the M41T93ZQA6F support SPI interface?
Yes, it supports SPI bus serial interface (SPI mode 0 [CPOL = 0, CPHA = 0]). - What additional features does the M41T93ZQA6F have?
It includes features such as programmable alarms, square wave output, RESET (RST) output, watchdog timer, programmable 8-bit counter/timer, and 7 bytes of battery-backed user SRAM. - How does the M41T93ZQA6F handle power failures?
It automatically switches to a battery or supercapacitor backup during power failures. - What is the operating temperature range of the M41T93ZQA6F?
The operating temperature range is –40 °C to +85 °C. - Is the M41T93ZQA6F RoHS compliant?
Yes, it is RoHS compliant. - What are some common applications of the M41T93ZQA6F?
It is used in industrial automation, consumer electronics, automotive systems, medical devices, and IoT devices.
