STMicroelectronics Real Time Clock 64 bit Binary, D:D:M:Y:C, 28-Pin SOX Surface Package M41ST85WMX6TR

STMicroelectronics M41ST85WMX6TR is a high-performance real-time clock (RTC) device delivering 64-bit binary coded decimal time and calendar functions with automatic power backup switching. Designed for industrial and embedded applications, the device combines RTC, NVRAM supervisor, and microprocessor supervision into a low-power CMOS SRAM architecture.

The device features a 64-byte memory map comprising 44 bytes of non-volatile RAM and 20 RTC registers that operate in binary coded decimal (BCD) format for day, date, month, year, and century data. It communicates through a 400 kHz I2C two-line bidirectional serial interface, facilitating seamless integration with microprocessors and microcontrollers.

An integrated power sense circuit detects power failures and switches automatically to an external backup battery to maintain the RTC and NVRAM operation indefinitely. The switchover mechanism also includes write-protecting logic via a chip-enable gate to safeguard LPSRAM data integrity during power transitions.

The on-chip microprocessor supervisor incorporates a programmable watchdog timer, power-on reset, and low voltage detect functions essential for system reliability. The built-in 32.768 kHz crystal oscillator ensures precise timing with a small footprint 28-pin SOX surface mount package offering compactness for space-constrained applications. The device operates over a broad temperature range from -40°C to 85°C and supports supply voltages between 2.7V and 3.6V.

This RTC is suited to industrial automation, embedded systems, data loggers, telemetry, and portable equipment requiring accurate timekeeping and non-volatile memory retention. The unit supports date formats in Binary D:D:M:Y:C and time in HH:MM:SS:hh, enhancing its adaptability to various regional and application requirements.

64-byte memory including 44 bytes of NVRAM and 20 real-time clock registers configured in BCD format. Automatic backup battery switchover circuit to maintain RTC and external LPSRAM during power failures. Built-in 32.768 kHz crystal-controlled oscillator for accurate timekeeping.

Microprocessor supervisor with programmable watchdog, power-on reset, and low voltage detect features. Operating temperature range from -40°C to 85°C suitable for diverse industrial environments. Compact 28-pin SOX surface mount package with dimensions 18.01mm x 7.67mm x 2.39mm (LxWxH).

Supply voltage range from 2.7V to 3.6V ensuring low power consumption. EnvMart offers a reliable catalog of semiconductor real-time clocks including STMicroelectronics products designed for demanding industrial and embedded applications.

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