DESCRIPTION
The Portable System Controller is a circuit which incorporates many of the functions necessary for low power portable products integrated into one chip. The DS1673 provides a Real Time Clock, NV RAM controller, microprocessor monitor, and a 3-channel, 8-bit analog-to-digital converter. Communication ith 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 analog-to-digital converter
■ Simple 3-wire interface
■ +3.0 or +5.0V operation