INFICON MDC-370 Thin Film Deposition Controller - Manual (Page 96)

MDC-370 DEPOSITION CONTROLLER
7.4 DISCRETE INPUTS
The Input circuit for the Passive I/O card is shown in Figure 7-1. The Passive
inputs are activated by shorting the input’s pins together. The inputs are
internally pulled up to 5 volt through a 4.7 Kohm resistor and incorporate a 10
millisecond filter to enhance noise immunity and provide protection from a
momentary short.
The Input circuit for the Active I/O card is shown in Figure 7-2. The Active
inputs are activated by supplying 12 to 120 volt AC or DC across the input pins.
The inputs incorporate a 10 millisecond filter to enhance noise immunity and
provide protection from a momentary short.
Pin assignments are shown in Table 8-4.
7.5 DIGITAL-TO-ANALOG CONVERTER OUTPUTS
Both of the DAC Analog outputs are single-ended and share the MDC-370
common ground, although a separate ground pin is provided for each of the two
DAC outputs. The nominal output voltage range is 0 to 5.0 volts and the output
impedance is 10 Kohm nominal. The DAC analog output circuit is shown in
Figure 7-3 and Table 8-2 provides pin assignments. Refer to Section 4.3.3.7 for
instructions on setting up the DAC parameters.
7.6 DIGITAL-TO-ANALOG CONVERTER CONTROL INPUTS
The DAC Control inputs are single-ended and share a common ground with the
MDC-370. The inputs are activated by connecting them to ground through a
jumper, mechanical switch or transistor. In the open state, the inputs are pulled
up to 5 volts through a 4.7 Kohm resistor. The DAC control input circuit is
shown in Figure 7-1. Refer to Figure 8-3 and Table 8-1 for pin assignments and
connector rating. The circuitry is located on the Main Processor board.
INPUT/OUTPUT CHARACTERISTICS 7-2