Sardis Technologies RTC-2417 Real-Time Clock Board
(This page is still under construction.)
(Currently in design stage)
The RTC-2417 board is a tiny expansion board that connects to the
ST-2900 CPU board (or other systems) to provide
a battery-backed-up real-time clock (RTC) function. It can also be
used as a general purpose breakout board for the DS2417 RTC chip.
RTC-2417 board features:
real-time clock chip (1-Wire bus) with 32-bit binary counter incremented at 1 Hz
- 32.768 kHz watch crystal
- optional N-FET to allow use with separate input and output pins from host
- optional interrupt output pin with programmable interrupt intervals
- 5-pin connector (.100" spacing) to connect to ST-2900 CPU board (or other systems)
- 2-pin connector (.100" spacing) for off-board battery (3V lithium)
- only 0.6" x 0.8" (15mm x 20mm)
- 6809 software drivers and utilities for FLEX and (Nitr)OS-9 Level I
The Maxim/Dallas RTC-2417 uses a
interface, typically implemented with one bidirectional I/O pin on a
host microcontroller. It can also use separate output and input pins,
such as from spare pins on the 2681/DUART on the ST-2900 CPU board,
if the optional N-FET is installed.
Another way to add a real-time clock to the ST-2900 will be with the new
(Click on a picture for a larger version.)
Tentative board layout.
"FLEX" was a trademark of Technical System Consultants (TSC).
"OS-9" is a registered trademark of Microware LP.
"1-Wire" is a registered trademark of Maxim Integrated.
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Last revised 2020-Jun-07 14:55 PDT.
Copyright 2020 by David C. Wiens.