Overview
The M41T93RQA6F is a low-power serial SPI bus real-time clock (RTC) produced by STMicroelectronics. This component is designed to provide accurate timekeeping with a built-in 32.768 kHz oscillator, either external crystal-controlled for the QFN16 package or embedded crystal for the SOX18 package. It features automatic switchover to a battery supply during power failures, ensuring continuous operation. The M41T93RQA6F is suitable for a wide range of applications requiring precise time and date management.
Key Specifications
| Parameter | Value |
|---|---|
| Supply Voltage | 2.7 V to 5.5 V |
| Operating Temperature | -40 °C to +85 °C |
| Package Type | QFN16 |
| No. of Pins | 16 |
| Interface Type | SPI (Mode 0 [CPOL = 0, CPHA = 0]) |
| Battery Supply Current | 365 nA |
| Operating Current | 80 μA |
| Accuracy | ±5 ppm typical after 2 reflows (SOX18) |
| Backup Power Source | Battery or supercapacitor |
| User SRAM | 7 bytes |
Key Features
- Ultra-low battery supply current of 365 nA
- Factory calibrated accuracy ±5 ppm typical after 2 reflows (SOX18)
- 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
- Square wave output (defaults to 32 KHz on power-up)
- RESET (RST) output
- Watchdog timer
- Programmable 8-bit counter/timer
- Battery low flag
- Oscillator stop detection
Applications
The M41T93RQA6F is versatile and can be used in various applications, including:
- Industrial automation systems requiring precise timekeeping
- Medical devices that need accurate date and time management
- Automotive systems for clock and calendar functions
- Consumer electronics such as smart home devices and appliances
- IoT devices that require low-power timekeeping solutions
Q & A
- What is the operating voltage range of the M41T93RQA6F?
The operating voltage range is from 2.7 V to 5.5 V.
- What is the typical battery supply current of the M41T93RQA6F?
The typical battery supply current is 365 nA.
- What is the accuracy of the M41T93RQA6F after 2 reflows?
The accuracy is ±5 ppm typical after 2 reflows (SOX18).
- Does the M41T93RQA6F support SPI interface?
Yes, it supports SPI bus serial interface (Mode 0 [CPOL = 0, CPHA = 0]).
- What is the operating temperature range of the M41T93RQA6F?
The operating temperature range is from -40 °C to +85 °C.
- Does the M41T93RQA6F have a watchdog timer?
Yes, it includes a watchdog timer.
- How many bytes of user SRAM does the M41T93RQA6F provide?
It provides 7 bytes of battery-backed user SRAM.
- Can the M41T93RQA6F be used with a supercapacitor for backup power?
Yes, it can be used with either a battery or a supercapacitor for backup power.
- Does the M41T93RQA6F have a square wave output?
Yes, it has a square wave output that defaults to 32 KHz on power-up.
- Is the M41T93RQA6F available in different package types?
Yes, it is available in QFN16 and SOX18 packages.
