The DS1673 is an integrated circuit that incorporates many of the functions necessary for low-power portable products into a single 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. The RTC provides seconds, minutes, hours, day, date, month, and year information with leap year compensation. The RTC also provides an alarm interrupt. This interrupt works when the DS1673 is powered by the system power supply or when in battery-backup operation, so the alarm can be used to wake up a system that is powered down. Automatic backup and write protection of an external SRAM is provided through the VCCO, CEOL, and CEOH pins. The backup energy source used to power the RTC is also used to retain RAM data in the absence of VCC through the VCCO pin. The chip- enable outputs to RAM (CEOL and CEOH) are controlled during power transients to prevent data corruption.
The DS1673 portable system controller integrates a real‑time clock, non‑volatile RAM controller, microprocessor monitor and a 3‑channel, 8‑bit successive‑approximation ADC. Communication is performed via a simple 3‑wire serial interface and the device operates from either a 3.0 V or 5.0 V supply.
The chip includes automatic backup and write‑protect features for external SRAM, a watchdog timer, push‑button reset, and configurable alarm functions. It is offered in 20‑lead TSSOP and SO packages and is specified for operation from 0 °C to +70 °C.
| Supply Voltage | +3.0 V or +5.0 V |
|---|---|
| Operating Temperature Range | 0 °C to +70 °C |
| ADC Resolution | 3‑channel, 8‑bit |
| RTC Features | Seconds to year with leap‑year compensation, alarm interrupt |
The DS1673 communicates through a simple 3‑wire serial interface.
The device can operate from either a 3.0 V or a 5.0 V supply.