DS1557 - 4M非易失、Y2K兼容时钟RAM

DS1557是Maxim美信半导体公司的一款1-Wire器件产品，DS1557是4M非易失、Y2K兼容时钟RAM，本站介绍了DS1557的封装应用图解、特点和优点、功能等，并给出了与DS1557相关的Maxim元器件型号供参考。

DS1557 - 4M非易失、Y2K兼容时钟RAM - 1-Wire器件 - Maxim美信半导体高性能芯片品质 - 美信半导体

产品概述

The DS1557 is a full-function, year-2000-compliant (Y2KC), real-time clock/calendar (RTC) with an RTC alarm, watchdog timer, power-on reset, battery monitor, and 512k x 8 nonvolatile static RAM. User access to all registers within the DS1557 is accomplished with a byte-wide interface as shown in Figure1. The RTC registers contain century, year, month, date, day, hours, minutes, and seconds data in 24-hour BCD format. Corrections for day of month and leap year are made automatically.

The RTC registers are double-buffered into an internal and external set. The user has direct access to the external set. Clock/calendar updates to the external set of registers can be disabled and enabled to allow the user to access static data. Assuming the internal oscillator is turned on, the internal set of registers is continuously updated; this occurs regardless of external registers settings to guarantee that accurate RTCinformation is always maintained.

The DS1557 has interrupt (active-low IRQ/FT) and reset (active-low RST) outputs which can be used to control CPU activity.The (active-low IRQ/FT) interrupt output can be used to generate an external interrupt when the RTC register values match user programmed alarm values. The interrupt is always available while the device is powered from the system supply and can be programmed to occur when in the battery-backed state to serve as a system wakeup. Either the active-low IRQ/FT or active-low RST outputs can also be used as a CPU watchdog timer, CPU activity ismonitored and an interrupt or reset output will be activated if the correct activity is not detected within programmed limits. The DS1557 power-on reset can be used to detect a system power down or failure and hold the CPU in a safe reset state until normal power returns and stabilizes; the active-low RST output is used for this function.

The DS1557 also contains its own power-fail circuitry, which automatically deselects the device when the VCC supply enters an out-of-tolerance condition. This feature provides a high degree of data securityduring unpredictable system operation brought on by low VCC levels.

关键特性

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