GENERAL DESCRIPTION
The DS1670 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 DS1670 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
■ 3.3V Operation
■ Underwriters Laboratory (UL) Recognized