The DS1677 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, power-fail warning, and
a 3-channel, 8-bit analog-to-digital converter
(ADC). Communication with the DS1677 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 DS1677
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 and
active-low CEO 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. Active-low CEO, the chip-enable output to SRAM, is controlled
during power transients to prevent data
corruption.
Notes: **This pricing is BUDGETARY, for comparing similar parts. Prices are in
U.S. dollars and subject to change. Quantity pricing may vary
substantially and international prices may differ due to local
duties, taxes, fees, and exchange rates. For volume-specific prices
and delivery, please see the price and availability page
or contact an authorized distributor.
다운로드