Overview
The M41T94MQ6E, produced by STMicroelectronics, is a serial real-time clock (RTC) integrated circuit designed for precise timekeeping and additional memory functions. This device features a built-in 32.768 kHz crystal oscillator, ensuring high stability and accuracy. It includes 44 bytes of non-volatile RAM (NVRAM) and a RESET output, making it suitable for a wide range of applications requiring reliable time and date tracking.
Key Specifications
| Parameter | Value |
|---|---|
| Operating Voltage | 2.7 to 5.5 V |
| Oscillator Operating Voltage | 2.5 to 5.5 V |
| Crystal Oscillator Frequency | 32.768 kHz |
| Serial Interface | SPI (up to 2 MHz) |
| Power Consumption (Battery Supply) | Ultralow battery supply current of 500 nA (max) |
| Memory | 44 bytes of NVRAM, 8 bytes of SRAM for clock/calendar |
| Package Options | 16-lead SOIC, 28-lead SOIC with SNAPHAT® top |
| Temperature Range | -40°C to 85°C |
| Compliance | RoHS compliant, lead-free second level interconnect |
Key Features
- Counters for tenths/hundredths of seconds, seconds, minutes, hours, day, date, month, year, and century in BCD format.
- 32 kHz crystal oscillator with integrated load capacitance for exceptional stability.
- Serial peripheral interface (SPI) up to 2 MHz.
- Ultralow battery supply current of 500 nA (max).
- Battery low flag and automatic switchover to battery supply during power failure.
- Programmable alarm and interrupt function, even during battery backup mode.
- Accurate programmable watchdog timer (from 62.5 ms to 128 s).
- Microprocessor power-on reset and additional debounced inputs for reset generation.
- Square wave output and user-accessible clock calibration setting.
Applications
The M41T94MQ6E is suitable for various applications requiring precise timekeeping, such as:
- Industrial control systems.
- Medical devices.
- Automotive systems.
- Consumer electronics.
- Smart home devices.
- IoT devices.
Q & A
- What is the primary function of the M41T94MQ6E?
The primary function is to provide a precise real-time clock with additional memory and alarm features. - What is the operating voltage range of the M41T94MQ6E?
The operating voltage range is 2.7 to 5.5 V. - What type of serial interface does the M41T94MQ6E use?
The device uses a Serial Peripheral Interface (SPI) up to 2 MHz. - How much current does the M41T94MQ6E consume from the battery supply?
The device consumes an ultralow battery supply current of 500 nA (max). - What are the package options available for the M41T94MQ6E?
The device is available in 16-lead SOIC and 28-lead SOIC with SNAPHAT® top. - Is the M41T94MQ6E RoHS compliant?
Yes, the device is RoHS compliant and has a lead-free second level interconnect. - What is the temperature range for the M41T94MQ6E?
The temperature range is -40°C to 85°C. - Does the M41T94MQ6E support programmable alarms?
Yes, it supports programmable alarms and interrupts, even during battery backup mode. - What is the purpose of the watchdog timer in the M41T94MQ6E?
The watchdog timer is an accurate programmable timer that can be set from 62.5 ms to 128 s to monitor system activity. - How does the M41T94MQ6E handle power failures?
The device automatically switches to the battery supply during power failures and has a power sense circuit to detect power failures.
