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Input/Output Module (I/O)
- Fabrication Responsibility:
- Lyle Johnson, WA7GXD (USA)
Chuck Green, N0ADI (USA)
- Size:
- Extension 200x270
- Average Power Dissipation:
- 1 Watt
Description
The Phase 3D spacecraft is very complex and requires considerably more
Input/Output (I/O) capacity than can be conveniently provided by the IHU's 1802 processor. Previous Phase 3 spacecraft
used an analog multiplexer to provide 24 temperature inputs, 24 voltage
measurement points and 12 current measurement points. The Phase 3D
multiplexer provides
- 48 temperature measurement points,
- 64 voltage measurement points and
- 12 current measurements points.
In addition, numerous 8-bit and 16-bit digital output ports are latched
and/or decoded by the I/O module.
Like the IHU, the I/O Module is designed using
flight-proven 4000-series CMOS logic operating at 10 volts, as well as
bipolar op-amps and comparators. The basis of the circuitry uses
legacy designs by DJ4ZC.
Last updated: Feb 4, 1996
by Ralf Zimmermann, DL1FDT