Hi-Rho Controller Signal Assignments:
The signal assignment section of this manual contains descriptions of the signal assignments for the Hi-Rho CCD Controller. It corresponds to the Signal Assignment tab in the electronics schematics binder.
The signal assignments on this sheet show the signals generated on the Leach Utility board that are used within the controller. Most of these signals are generated under software control and exit the Utility board via the 96-pin din connector on the front edge of the board. A 64-pin ribbon cable connects the utility board to the Lick Interconnect board. The cable uses IDC connectors which only pass the A1-32 and C1-32 rows of the 96-pin connectors, row B is not passed (0.1 spacing ribbon cable can only accommodate 64 conductors). The table is divided into two halves. The left side shows the connections for row A pins 1 through 32 and the right side shows the C row.
Notice first of all, pin A1 is labeled -15V and pin C1 is labeled +15V. These power supply connections are inputs to the Utility board. Because the +15V and -15V power supplies are switched on and off at the backplane via software control at the Power Monitor board, we have to provide a path into the Utility board for +Vee and -Vee. (The same holds true for the Video cards. The this case, the +15 and -15V is connected via the DB-37 cables between the Interconnect board and the Leach Video boards.)
Continuing on the left side of the table, DOUT5, 15V ENABLE, and DOUT4, 48V ENABLE of the Utility board are used to control the application of the +/-15V and +48V supplies to the controller backplane. These signals are true when pulled low. They are wired via the ribbon cable stub that is routed to the front of the controller chassis. DOUT0 on pin A9 is used with ground on A18 to open and close the shutter. This signal is carried in the 17-pin power cable between the controller chassis and the dewar electronics box. Pin A22, EXRES+ is an input that connects an external reset line for the Leach electronics. This signal is generated on the EL-1183 Power Monitor board and is asserted if the +5V power supply drops below about 4.7 volts. This signal is also wired via the ribbon cable stub. AOUT 2 on pin A25 is used to drive the front panel temperature display. This signal along with it's return are also wired via the ribbon cable stub. The last signal used from the A-side of the connector is I SOURCE. This line is used to present a constant current source to the temperature diode within the CCD chamber of the dewar. This output is not under software control.
On the C-side of the table, pins 5 through 9, DIN 0 through 4, are available for inputting a hard wired dewar ID code. At the time of this writting these lines are wired all of the way to the dewar electronics box but are not implemented. Pin C22 is labeled shutter control but for this controller, DOUT 0 is used to control the shutter. Pins C25 and C23 are used to control the temperature in the vacumm chamber containing the CCD. In normal operation, the AOUT 0 voltage is adjusted to maintain an even temperature. The software on the Leach Timing board adjusts the voltage depending on the input it recieves at AIN 5 on pin C32. Also, note that pin C32 is wired to pin A27 and reads the voltage developed across the temperature diode.
Video Board
Signal Assignments, 
EL-1279
This sheet shows the signal assignments for the two Leach Video boards. The left table presents the signals from board 1 and the right table presents the signals of board 2. In each case the first seven pins are programmed DC levels that are used as bias levels for the CCD. The voltage range of each output is noted in the fourth column. Pins 8 through 19 are programmable clock outputs. The timing of these output waveforms are programmed on the timing board. Pins 20 and 21 are not connected and the rest of the pins, 22 through 37 are grounds.
For the Hi-Rho CCD four bias voltages are generated on the Video board. the table below gives the nominal values for the bias levels:
Output Drain Reset Drain Output transfer gate Substrate voltage Hi Rho CCD bias levels
Note: these voltages are nominal and the actual measured voltage may differ. In any case, ADJUSTMENTS TO THESE LEVELS MUST ONLY BE DONE BY OR UNDER DIRECTION OF THE CCD LAB PERSONNEL. In addition to the bias levels shown above, the controller also contains -34V and +48V power supplies. These supplies are used for????????????????????????????????????????????????
The rest of the signals on the board are the clocked outputs. As shown, each