Overview
The M41T94MH6E from STMicroelectronics is a serial real-time clock (RTC) integrated circuit designed to provide accurate timekeeping and additional features for various applications. This device includes a built-in 32.768 kHz crystal oscillator, 44 bytes of non-volatile RAM (NVRAM), and a RESET output. It operates as a slave device on the SPI serial bus, making it compatible with a wide range of microcontrollers. The M41T94MH6E is available in both 16-lead and 28-lead SOIC packages, with the latter including a SNAPHAT® top that integrates the battery and crystal.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Operating Voltage | VCC | 2.7 to 5.5 V |
| Oscillator Operating Voltage | VCC for Oscillator | 2.5 to 5.5 V |
| Crystal Oscillator Frequency | 32.768 kHz | |
| Serial Interface | SPI (up to 2 MHz) | |
| Battery Supply Current | Max | 500 nA |
| Power-Fail Deselect Voltage | VPFD | 2.55 V to 2.70 V or 4.20 V to 4.50 V |
| Package Options | 16-lead SOIC, 28-lead SOIC with SNAPHAT® top | |
| Temperature Range | -40°C to 85°C | |
| Non-Volatile RAM | 44 bytes | |
| Watchdog Timer Range | 62.5 ms to 128 s |
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, valid even during battery backup mode.
- Accurate programmable watchdog timer from 62.5 ms to 128 s.
- Microprocessor power-on reset and additional debounced reset inputs.
- Square wave output and programmable frequency test output.
- RoHS compliant with lead-free second level interconnect.
Applications
- Embedded systems requiring accurate timekeeping.
- Industrial control systems and automation.
- Medical devices and healthcare equipment.
- Aerospace and defense applications.
- Consumer electronics such as smart home devices and appliances.
- Automotive systems and telematics.
Q & A
- What is the primary function of the M41T94MH6E?
The primary function of the M41T94MH6E is to provide accurate real-time clock functionality with additional features such as alarm interrupts, watchdog timer, and square wave output.
- What are the operating voltage ranges for the M41T94MH6E?
The operating voltage range for the M41T94MH6E is 2.7 to 5.5 V.
- What type of serial interface does the M41T94MH6E use?
The M41T94MH6E uses a Serial Peripheral Interface (SPI) up to 2 MHz.
- How much current does the M41T94MH6E consume from the battery supply?
The M41T94MH6E consumes a maximum of 500 nA from the battery supply.
- What are the package options available for the M41T94MH6E?
The M41T94MH6E is available in 16-lead SOIC and 28-lead SOIC with a SNAPHAT® top that integrates the battery and crystal.
- Does the M41T94MH6E support programmable alarms and interrupts?
Yes, the M41T94MH6E supports programmable alarms and interrupts, which are valid even during battery backup mode.
- What is the range of the programmable watchdog timer in the M41T94MH6E?
The programmable watchdog timer range is from 62.5 ms to 128 s.
- Is the M41T94MH6E RoHS compliant?
Yes, the M41T94MH6E is RoHS compliant with lead-free second level interconnect.
- How does the M41T94MH6E handle power failures?
The M41T94MH6E automatically switches to the battery supply during a power failure and maintains clock operations using the battery.
- What is the purpose of the SNAPHAT® top in the 28-lead SOIC package?
The SNAPHAT® top in the 28-lead SOIC package integrates the battery and crystal, making it convenient for surface mount processes.
