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From: Dave Wright <wrda@mbari.org>
Subject: Rocky Doc...
To: markp@wave.mbari.org (Mark Pickerill), bobh@wave.mbari.org (Bob Herlien),
        thga@wave.mbari.org (Gary Thurmond)
Date: Thu, 16 May 96 12:51:41 PDT
Mailer: Elm [revision: 70.85]
Status: RO


                      MBARI 2080 "Rocky Board"

The Rocky board replaces the "handwired board" within the OASIS assembly.
It provides the following system resources; sixteen FET power switches, eight
relays for serial data multiplexing, a power and data isolation interface for
CTD connection, housekeeping sensors for can temperature, battery voltage and
current, signal conditioning for two PAR sensors, four current sinking and
four current sourcing "wakeup" signals, and an LED status indicator.


Programming notes:

Unlike the handwired board, the Rocky board is connected to the bus expansion
port of the OASIS controller rather than the PIA port. The power switches and
the wakeup signals are non-volatile and are not affected by OASIS controller
power cycling. The are however affected by an interruption of can power, and
will come up in an indeterminate state.

The power switches are organized as two bytewide output ports at sequential
addresses, and may be written to as a word if desired. A logical one will turn
on the associated switch. There are no bit toggle operations required as was
necessary with the handwired board.

The diagnostic LED can be used for any purpose the programmer desires. To turn
it on, a byte write to the "on" address is required. The data is irrelevant.
The same is true for a write to the "off" address.

The relays are handled in the same manner as those that are on the OASIS
controller board.

The wakeup port is now a non-volatile device. When using the current sourcing
outputs it must be remembered to turn them off before powering down the
controller. If the connected instrument should require a continuous active
high signal it must be insured that the current requirements are in the
sub milliamp regime.

\ Rocky board equates
$610  PWRSW1    \ Power switch port, lobyte  b0-b3  J22,1-7 /  b4-b7  J21,1-7
$611  PWRSW2    \ Power switch port, hibyte  b8-b11 J24,1-7 / b12-b15 J23,1-7
$612  WAKEPORT  \ Wakeup port
$613  RELAYC    \ Relays 8-11
$614  RELAYD    \ Relays 12-15
$660  LEDOFF    \ A write to this address turns off the diagnostic LED
$670  LEDON     \ A write to this address turns on the diagnostic LED


Assembly notes:

The devices VR1-3 must be installed in the -opposite- direction from that
indicated on the silkscreen.

The device U6 requires that a .01uF "flat cap" be installed on the solderside
of the board between pins 4 and 8, and that pin 4 be routed to analog ground
and pin 8 to +8V. There is a via to the agnd plane located close to U6,4 such
that the pin of the flat cap will reach it. A short wire will be required from
U6,8 to J4,17 where +8V can be picked up.

When converting existing OASIS cans to the Rocky board it is necessary to
modify the OASIS controller board. Perform the modifications listed in
o_pcb2.mod, operations 1 and 2. No other changes are necessary. These mods
affect the bus expansion port tristate enable.

                               -END-