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GENERAL DESCRIPTION

The DS1673 portable system controller is a circuit that incorporates many of the functions necessary for low-power portable products integrated into one chip. The device provides a real-time clock (RTC), NV RAM controller, microprocessor monitor, and a 3-channel, 8-bit analog-to-digital converter (ADC). Communication with the DS1673 is established through a simple 3-wire interface.

FEATURES

■ Provides Real-Time Clock

??? Counts Seconds, Minutes, Hours, Date of the Month, Month, Day of the Week, and Year with Leap Year Compensation Valid Up to 2100

??? Power-Control Circuitry Supports System Power-On from Day/Time Alarm

■ Microprocessor Monitor

??? Halts Microprocessor During Power Fail

??? Automatically Restarts Microprocessor after Power Failure

??? Monitors Pushbutton for External Override

??? Halts and Resets an Out-of-Control Microprocessor

■ NV RAM Control

??? Automatic Battery Backup and Write Protection to External SRAM

■ 3-Channel, 8-Bit ADC

■ Simple 3-Wire Interface

■+3.0V or +5.0V Operation