Overview
The M41T56MH6E, produced by STMicroelectronics, is a low-power, serial real-time clock (RTC) with 56 bytes of non-volatile RAM (NVRAM). This component features a built-in 32,768 Hz oscillator controlled by an external crystal and includes the first 8 bytes of the RAM for the clock/calendar function, configured in binary coded decimal (BCD) format. The device operates as a slave on the I2C bus with a 100 kHz protocol and supports automatic power-fail detection and switching to a battery supply during power failures. It is supplied in an 8-lead plastic SOIC package and is RoHS compliant.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Package | 8-lead plastic SOIC (SO8) | SO-8 |
| Operating Temperature | –40 °C to 85 °C | –40 °C to 85 °C |
| Supply Voltage | 5 V ±10% | 5 V ±10% |
| Timekeeping Voltage | Down to 2.5 V | Down to 2.5 V |
| Battery Supply Current | 450 nA (typ at 3 V) | 450 nA |
| NVRAM Size | 56 bytes | 56 bytes |
| Oscillator Frequency | 32,768 Hz | 32,768 Hz |
| I2C Bus Frequency | 100 kHz | 100 kHz |
| Data Retention Time | In excess of 10 years with a 50 mAh, 3 V lithium cell | In excess of 10 years |
Key Features
- Counters for seconds, minutes, hours, day, date, month, years, and century
- 32 KHz crystal oscillator integrating load capacitance (12.5 pF) for exceptional oscillator stability
- Serial interface supports I2C bus (100 kHz protocol)
- Ultra-low battery supply current of 450 nA (typ at 3 V)
- Automatic power-fail detect and switch circuitry
- 56 bytes of general purpose RAM
- Software clock calibration to compensate crystal deviation due to temperature
- Automatic leap year compensation
- RoHS compliant and lead-free second level interconnect
Applications
The M41T56MH6E is suitable for a variety of applications requiring accurate timekeeping and low power consumption. These include:
- Consumer electronics such as smart home devices, appliances, and wearables
- Industrial control systems and automation
- Medical devices requiring precise timing
- Automotive systems where reliable timekeeping is crucial
- IoT devices that need to maintain time accurately over long periods
Q & A
- What is the primary function of the M41T56MH6E?
The M41T56MH6E is a serial real-time clock (RTC) with 56 bytes of NVRAM, designed for accurate timekeeping and low power consumption.
- What type of package is the M41T56MH6E available in?
The M41T56MH6E is available in an 8-lead plastic SOIC (SO8) package.
- What is the operating temperature range of the M41T56MH6E?
The operating temperature range is –40 °C to 85 °C.
- How does the M41T56MH6E handle power failures?
The device has automatic power-fail detect and switch circuitry, which switches to a battery supply during power failures.
- What is the typical battery supply current of the M41T56MH6E?
The typical battery supply current is 450 nA at 3 V.
- How much NVRAM does the M41T56MH6E have?
The device has 56 bytes of general purpose NVRAM.
- What is the frequency of the oscillator in the M41T56MH6E?
The oscillator frequency is 32,768 Hz.
- What is the data retention time of the M41T56MH6E with a lithium cell?
The data retention time is in excess of 10 years with a 50 mAh, 3 V lithium cell.
- Does the M41T56MH6E support software clock calibration?
Yes, it supports software clock calibration to compensate for crystal deviation due to temperature.
- Is the M41T56MH6E RoHS compliant?
Yes, the M41T56MH6E is RoHS compliant and has lead-free second level interconnect.
