The MC68185FN is a Real-Time Clock Plus RAM (RTCRAM) integrated circuit manufactured by Freescale Semiconductor (now NXP). It combines the functionality of a real-time clock, which maintains accurate timekeeping, with a static RAM (SRAM) memory component. This integration makes it suitable for applications requiring precise timing and non-volatile data storage.

Applications

• Embedded systems that require accurate timekeeping.
• Industrial control systems.
• Data logging equipment.
• Metering devices.
• Battery-backed memory applications.

Features

• Real-Time Clock (RTC): Provides accurate timekeeping with programmable alarm functions.
• Static RAM (SRAM): Integrated SRAM for non-volatile data storage.
• Low Power Consumption: Designed for battery-backed operation, ensuring long-term timekeeping and data retention.
• Serial Interface: Uses a serial interface for communication with a host processor.
• Programmable Alarm: Ability to set alarms for specific times and dates.
• Century Byte: Supports century byte for long-term date tracking.

Benefits

• Accurate Timekeeping: Ensures precise time information for critical applications.
• Non-Volatile Data Storage: SRAM retains data even when power is removed, eliminating the need for frequent reprogramming.
• Reduced System Complexity: Integrated RTC and SRAM simplify circuit design and reduce component count.
• Low Power Operation: Extends battery life in portable and battery-backed systems.
• Easy Integration: Serial interface allows for straightforward communication with microcontrollers and other processors.

Additional Details

The MC68185FN operates with a 32.768 kHz crystal oscillator to maintain accurate timekeeping. It provides registers for seconds, minutes, hours, day of the week, date, month, and year. The integrated SRAM is typically used for storing configuration data, calibration parameters, or logged information. The device is designed to operate over a wide temperature range, making it suitable for industrial and automotive applications. The serial interface minimizes the number of pins required for communication, further simplifying system design. Specific supply voltage requirements and package information can be found in the device datasheet. The device also has provision for battery backup, allowing it to maintain time and data even when the main power supply is off.

This RTCRAM offers a robust and reliable solution for applications requiring both accurate timekeeping and non-volatile memory.