Overview
The M41T93RMY6F is a low-power serial SPI bus real-time clock (RTC) manufactured by STMicroelectronics. This component features a built-in 32.768 kHz oscillator, with the SOX18 package including an embedded crystal. It is designed to provide accurate timekeeping with automatic switchover to a battery supply during power failures. The M41T93RMY6F supports various functions such as a non-volatile time-of-day clock/calendar, programmable alarms, a watchdog timer, and a square wave output. It 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 |
| Accuracy | ±5 ppm typical after 2 reflows (SOX18) |
| Operating Temperature | –40 °C to +85 °C |
| Package Options | 16-lead QFN, 18-lead SOX18 with embedded crystal |
| Interface | SPI bus serial interface (supports SPI mode 0 [CPOL = 0, CPHA = 0]) |
| NVRAM Size | 7 bytes |
| Oscillator Frequency | 32.768 kHz |
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
- 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 M41T93RMY6F is suitable for a wide range of applications that require accurate timekeeping and low power consumption. These include:
- Industrial control systems
- Medical devices
- Automotive systems
- Consumer electronics
- IoT devices
- Data loggers and data acquisition systems
Q & A
- What is the primary function of the M41T93RMY6F?
The primary function of the M41T93RMY6F is to provide a low-power real-time clock (RTC) with a serial SPI bus interface. - What are the package options for the M41T93RMY6F?
The M41T93RMY6F is available in 16-lead QFN and 18-lead SOX18 packages with an embedded crystal. - What is the operating voltage range of the M41T93RMY6F?
The operating voltage range is 2.0 V to 5.5 V. - How accurate is the M41T93RMY6F?
The M41T93RMY6F has a factory calibrated accuracy of ±5 ppm typical after 2 reflows for the SOX18 package. - What is the battery supply current of the M41T93RMY6F?
The battery supply current is 365 nA. - Does the M41T93RMY6F support multiple alarms?
Yes, it supports a programmable alarm with an interrupt function and an optional second programmable alarm. - What is the purpose of the watchdog timer in the M41T93RMY6F?
The watchdog timer is used to monitor the system and reset it if it fails to respond within a specified time. - How much user SRAM is available in the M41T93RMY6F?
There are 7 bytes of battery-backed user SRAM available. - What is the operating temperature range of the M41T93RMY6F?
The operating temperature range is –40 °C to +85 °C. - Does the M41T93RMY6F support SPI mode 0?
Yes, it supports SPI mode 0 [CPOL = 0, CPHA = 0].
