Overview
The M41T56C64MY6E is a low-power, serial real-time clock (RTC) produced by STMicroelectronics. This device integrates a 32,768 Hz oscillator, which is externally crystal-controlled, and features 56 bytes of non-volatile RAM (NVRAM) along with 64 Kbit (8192 bit x 8) of EEPROM. The RTC includes counters for seconds, minutes, hours, day, date, month, years, and century, all configured in binary coded decimal (BCD) format. The device is designed to operate with ultra-low power consumption, making it suitable for battery-powered applications.
Key Specifications
| Specification | Value |
|---|---|
| Oscillator Frequency | 32,768 Hz (external crystal controlled) |
| NVRAM Size | 56 bytes |
| EEPROM Size | 64 Kbit (8192 bit x 8) |
| Supply Voltage | 5 V ±10% |
| Timekeeping Voltage | Down to 2.5 V |
| Battery Supply Current | 450 nA (typ at 3 V) |
| Operating Temperature | –40 °C to 85 °C |
| Package Type | 8-lead plastic SOIC (SO8) |
| RoHS Compliance | Ecopack3 |
Key Features
- Counters for seconds, minutes, hours, day, date, month, years, and century in BCD format
- 32 KHz crystal oscillator with integrated load capacitance (12.5 pF) for high oscillator stability
- Serial interface supporting I2C bus (100 kHz protocol)
- Ultra-low battery supply current of 450 nA (typ at 3 V)
- Automatic power-fail detect and switch circuitry
- Software clock calibration to compensate for crystal deviation due to temperature
- Automatic leap year compensation
- 56 bytes of general-purpose RAM and 64 Kbit EEPROM
- RoHS compliant and lead-free second level interconnect
Applications
The M41T56C64MY6E is suitable for a variety of applications that require precise timekeeping and low power consumption. These include:
- Battery-powered devices such as smart meters, fitness trackers, and wearable devices
- Industrial control systems and automation equipment
- Medical devices and healthcare equipment
- Consumer electronics such as set-top boxes, DVD players, and gaming consoles
- Automotive systems requiring reliable timekeeping
Q & A
- What is the primary function of the M41T56C64MY6E?
The primary function of the M41T56C64MY6E is to provide a low-power, serial real-time clock (RTC) with additional memory for data storage.
- What type of oscillator does the M41T56C64MY6E use?
The M41T56C64MY6E uses a 32,768 Hz oscillator that is externally crystal-controlled.
- How much NVRAM and EEPROM does the M41T56C64MY6E have?
The device has 56 bytes of NVRAM and 64 Kbit (8192 bit x 8) of EEPROM.
- What is the typical battery supply current of the M41T56C64MY6E?
The typical battery supply current is 450 nA at 3 V.
- What is the operating temperature range of the M41T56C64MY6E?
The operating temperature range is –40 °C to 85 °C.
- Is the M41T56C64MY6E RoHS compliant?
Yes, the M41T56C64MY6E is RoHS compliant with an Ecopack3 rating.
- What type of package is the M41T56C64MY6E available in?
The device is available in an 8-lead plastic SOIC (SO8) package.
- Does the M41T56C64MY6E support software clock calibration?
Yes, the device supports software clock calibration to compensate for crystal deviation due to temperature.
- Does the M41T56C64MY6E have automatic leap year compensation?
Yes, the device includes automatic leap year compensation.
- What is the typical data retention time with a 50 mAh, 3 V lithium cell?
The typical data retention time is in excess of 10 years with a 50 mAh, 3 V lithium cell.
