AN100| Application Note
Maxim > App Notes > REAL-TIME CLOCKS Keywords: portable system controller, DS1670, DS1673, DS1677, 3 wire serial interface, real time clocks, real- Apr 23, 2001 time clocks, RTCs
APPLICATION NOTE 100
DS1670 Portable System Controller
Abstract: This application note describes how to use the DS1670 Portable System Controller, a 3-wire serial interface real-time clock (RTC). The DS1670 supplies features that are targeted at portable (hand held) systems.
Features
There is an increasing trend in the industry today towards portable battery-operated products. These products typically require extremely small form factors and low power. The DS1670 Portable System Controller is designed to help the portable system designer in meeting these two requirements by integrating key functions typically needed in these systems while consuming very little power. Key functions frequently required in portable products include a real time clock; nonvolatile RAM control to ensure that data is not lost in the event of a power-down or battery-fail; microprocessor monitoring to ensure that the microprocessor does not "run out of control"; and analog-to-digital converters for interfacing with external environmental sensors, battery monitoring, etc. The DS1670 Portable System Controller replaces as many as four separate integrated circuits by incorporating all of these functions in a single device. The DS1670 provides a very accurate real time clock, nonvolatile SRAM controller, microprocess
or monitor, and 3-channel 8bit analog-to-digital converter. Communication with the device is established through a simple 3-wire interface.
Using the DS1670
The DS1670 can be directly interfaced with any microprocessor or microcontroller through a 3-wire serial interface. The serial interface gives the microprocessor access to the DS1670 registers, which consist of the Real Time Clock Registers, Control Register, Status Register, Watchdog Register, and ADC (Analog-to-Digital Converter) Register. Figures 1 and 2 illustrate a block diagram and address map of the DS1670, respectively. The following paragraphs briefly describe the operation of the various components of the DS1670 as well as the functions of the various control and status registers. For more detailed information, please consult the DS1670 data sheet.
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