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B
Register Definitions
Open Collector Output (W) Base + B
Digital Output (W) Base + C
DAC2 Output MSB(W) Base + D
N O T E
B-8
The Open Drain Output register controls the state of the
Switch/Load Unit backplane mounted open drain drivers. The
open drain drivers can sink up to 200 mA individual, 150 mA
with all drivers on at once. The drivers have a light pull-up to
Vcc (100 k ohm).
Bits
7
6
Write
OCout
OCout
7
Table B-5 OCout
Register State
0
1
Writing to the Digital Output register sets the output value of
the Spare_DigOut[0]-Spare_DigOut[7] signals present on back
plane connector J104. Spare_DigOut[0]- Spare_DigOut[7]
outputs will directly reflect the contents of this register (1 =
high, 0 = low).
Bits
7
Write
Dout
Writing to the DAC2 Output register sets the Most Significant
Bit (MSB) of the DAC2 digital input.
To set the value of the DAC output, always write the MSB first, followed
by the LSB (register offset E
the LSB is written. See
Bits
7
6
x
x
Write
h
5
4
OCout
OCout
OCout
6
5
4
States
x
Driver State
Nominal Output value
off
Float to +5 V
on
Pulled to ground.
h
6
5
4
Dout
Dout
Dout
7
6
5
h
). The output of the DAC will not update until
h
"DAC
Scaling".
5
4
DAC2
DAC2
DAC2
13
12
E6198B Switch/Load Unit User Manual
3
2
1
Ocout
OCout
3
2
1
3
2
1
Dout
Dout
Dout
4
3
2
3
2
1
DAC2
DAC2
11
10
9
0
OCout
0
0
Dout
1
0
0
DAC2
8
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