Overview
The M41T94MQ6F, produced by STMicroelectronics, is a serial real-time clock (RTC) with integrated 44 bytes of non-volatile RAM (NVRAM) and a RESET output. This component features a built-in 32,768 Hz oscillator controlled by an external crystal and includes 8 bytes of SRAM for the clock/calendar function, configured in binary coded decimal (BCD) format. It also includes additional RAM for alarm, watchdog, and square wave functions. The M41T94MQ6F is designed to provide accurate time-keeping and various control functions, making it suitable for a wide range of applications requiring precise timing and low power consumption.
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 Hz |
| Load Capacitance | 12.5 pF |
| Serial Interface | 2 MHz SPI |
| Battery Supply Current | 500 nA (max) |
| NVRAM Size | 44 bytes |
| Package Types | 16-lead SOIC, 28-lead SOIC with SNAPHAT® top |
| Operating Temperature | -40°C to 85°C |
| RoHS Compliance | Ecopack2 (lead-free second level interconnect) |
Key Features
- Counters for tenths/hundredths of seconds, seconds, minutes, hours, day, date, month, year, and century
- 32 KHz crystal oscillator with integrated load capacitance for exceptional oscillator stability
- Serial peripheral interface (2 MHz SPI)
- Ultralow battery supply current of 500 nA (max)
- Battery low flag and automatic switchover and deselect circuitry
- 44 bytes of general purpose RAM
- Programmable alarm and interrupt function (valid even during battery backup mode)
- Accurate programmable watchdog timer (from 62.5 ms to 128 s)
- Microprocessor power-on reset
- Choice of power-fail deselect voltages
- Packaging includes 16-lead SOIC and 28-lead SOIC with SNAPHAT® top
- RoHS compliant and lead-free second level interconnect
Applications
The M41T94MQ6F is suitable for various applications that require precise time-keeping and low power consumption, such as:
- Industrial control systems
- Medical devices
- Automotive systems
- Consumer electronics
- IoT devices
- Any system requiring a reliable and accurate real-time clock with additional control functions like alarms and watchdog timers.
Q & A
- What is the primary function of the M41T94MQ6F?
The primary function of the M41T94MQ6F is to provide a real-time clock with additional features such as alarm interrupts, watchdog timer, and programmable square wave output. - What is the operating voltage range of the M41T94MQ6F?
The operating voltage range is 2.7 to 5.5 V. - What type of serial interface does the M41T94MQ6F use?
The M41T94MQ6F uses a 2 MHz SPI serial interface. - How much battery supply current does the M41T94MQ6F consume?
The battery supply current is 500 nA (max). - What is the NVRAM size of the M41T94MQ6F?
The NVRAM size is 44 bytes. - What are the available package types for the M41T94MQ6F?
The available package types are 16-lead SOIC and 28-lead SOIC with SNAPHAT® top. - Is the M41T94MQ6F RoHS compliant?
Yes, the M41T94MQ6F is RoHS compliant with lead-free second level interconnect. - What is the purpose of the SNAPHAT® top in the 28-lead SOIC package?
The SNAPHAT® top integrates both the crystal and battery, allowing it to be mounted on top of the SOIC package after surface mount process completion. - Can the M41T94MQ6F operate during power failures?
Yes, the M41T94MQ6F has a built-in power sense circuit that switches to battery supply during power failures. - What is the range of the programmable watchdog timer?
The programmable watchdog timer ranges from 62.5 ms to 128 s.
