Overview
The M41T11MH6F is a low-power serial real-time clock (RTC) produced by STMicroelectronics. It features 56 bytes of non-volatile RAM (NVRAM) and a built-in 32.768 kHz oscillator that is external crystal controlled. The device is designed to provide accurate timekeeping and includes counters for seconds, minutes, hours, day, date, month, years, and century. The M41T11MH6F also includes automatic power sense circuitry that switches to a battery supply during power failures, ensuring continuous operation.
Key Specifications
| Specification | Value |
|---|---|
| Operating Voltage | 2.0 to 5.5 V |
| Operating Temperature | –40 to 85°C |
| Crystal Oscillator Frequency | 32.768 kHz |
| NVRAM Size | 56 bytes |
| Interface | I²C bus (100 kHz protocol) |
| Battery Supply Current | 0.8 μA (typ. at 3 V) |
| Package Types | 8-lead SOIC, 28-lead SOIC with SNAPHAT |
| RoHS Compliance | Ecopack3 (SO-8), Ecopack2 (SOH28) |
Key Features
- Counters for seconds, minutes, hours, day, date, month, years, and century
- 32 kHz crystal oscillator integrating load capacitance (12.5 pF)
- Serial interface supports I²C bus (100 kHz protocol)
- Ultra-low battery supply current of 0.8 μA (typ. at 3 V)
- Automatic switchover and deselect circuitry
- 56 bytes of general-purpose RAM
- Software clock calibration to compensate for crystal deviation due to temperature
- Automatic leap year compensation
- Packaging includes a 28-lead SOIC and SNAPHAT (to be ordered separately)
- RoHS compliant and lead-free second level interconnect
Applications
The M41T11MH6F is suitable for a variety of applications requiring accurate timekeeping and low power consumption. These include:
- Industrial control systems
- Medical devices
- Consumer electronics
- Automotive systems
- IoT devices
Q & A
- What is the primary function of the M41T11MH6F?
The M41T11MH6F is a low-power serial real-time clock (RTC) with 56 bytes of NVRAM. - What is the operating voltage range of the M41T11MH6F?
The operating voltage range is 2.0 to 5.5 V. - What type of interface does the M41T11MH6F use?
The device uses an I²C bus interface with a 100 kHz protocol. - How much current does the battery supply typically consume?
The battery supply current is typically 0.8 μA at 3 V. - What are the available package types for the M41T11MH6F?
The device is available in 8-lead SOIC and 28-lead SOIC with SNAPHAT packages. - Is the M41T11MH6F RoHS compliant?
Yes, the M41T11MH6F is RoHS compliant. - What is the purpose of the SNAPHAT package?
The SNAPHAT package includes the battery and crystal and can be mounted on top of the SOIC package after the surface mount process to prevent damage from high temperatures. - How does the device handle power failures?
The device includes automatic power sense circuitry that switches to a battery supply during power failures. - What is the typical data retention time with a lithium cell?
The typical data retention time is in excess of 5 years with a 50 mA/h, 3 V lithium cell. - Does the M41T11MH6F support software clock calibration?
Yes, the device supports software clock calibration to compensate for crystal deviation due to temperature.
