DS1688

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The DS1688 is a real-time clock device from Maxim Integrated. It provides an extremely accurate clock source, able to keep time accurately over a wide temperature range and with very low power consumption.

Description

The DS1688 is a small, low-power CMOS Real-Time Clock (RTC) and calendar integrated circuit with a serial interface. It contains a 32.768 kHz timing crystal and a low current, 10 ppm low-dropout voltage regulator. It also contains an 8-pin integrated circuit (IC) package with a 40-bit CMOS EEPROM Core, that can store up to four registers and up to 32,767 addressable bytes of non-volatile data. Additionally, the device includes a 128-bit hardware random number generator, programmable frequency output, and various alarm features.

Features

• Serial Port Interface with EEPROM Memory for Data and Time Storage
• Accurate Timekeeping over Wide Temperatures
• Low Power Consumption
• 128-bit Hardware Random Number Generator
• Programmable Frequency Output
• Alarm Features Include Time, Date, and Day Alarm

Applications

The DS1688 is suitable for a wide range of applications, including industrial, mobile computing, and automotive monitoring due to its low power consumption and accurate time maintenance. The device is ESDA- and ESDD-protected to withstand harsh EMC environments. Additional applications for the DS1688 include:

• Industrial/Medical Instruments
• Mobile Computing
• Automotive Monitoring
• Patient Monitoring
• Wireless Health Monitoring
• Utility Meters with Real-Time Clocks

Working Principle

The DS1688 offers an extremely accurate timekeeping over wide temperature ranges; only consuming 14µA at 3.0V (typical). The device is driven by an internal 32.768 KHz crystal oscillator that is connected to an on-chip low dropout (LDO) voltage regulator that is capable of providing high stability and accuracy. The device is also capable of operating over a broad range of input voltages, including the whole range from VCCP to VCCN, thereby allowing for multiple power source configurations in various applications. The device uses an internal 47pF capacitive load circuit, allowing for operation over a wide range of operating temperature ranges.

When powered up, the DS1688 begins working, immediately checking its data and configuration registers for any changes and updating its clock accordingly. The calendar section of the device is also updated during this process, allowing for time and date information to be kept accurate. Additionally, the DS1688 also contains an alarm section which can be used to set reminders and other notifications, based on time, date, or day-of-the-week entries. Furthermore, the device also contains a programmable frequency output, allowing for synchronization with external peripherals as necessary.

When it comes to data storage and access, the device contains an 8-bit serial communication interface that allows for data to be read and written to the 32,767 addressable bytes of EEPROM memory located in the device. Data is written to the device by preprogrammed patterns, allowing for rapid access and modification of data stored in the EEPROM memory. The DS1688 also contains a 128-bit hardware random number generator allowing for completely unbiased sequence of binary numbers to be generated. Furthermore, the integrated clock IC features various interrupt sources, such as a day-of-the-week alarm, allowing for additional features and flexibility when dealing with data/time management.

Conclusion

The DS1688 is an excellent real-time clock device from Maxim Integrated for use in a variety of applications due to its low power consumption, wide temperature range and accuracy. With its integrated calendar and EEPROM data storage capabilities, the device can provide time and date tracking, as well as programmable frequency output and random number generation. For applications such as industrial, mobile computing, and automotive monitoring, the DS1688 can offer an outstanding performance with low power demands and wide temperature operation.

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