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2.8 D/A Conversion
The OME-A-822PGL/PGH provides two 12 bit D/A converters. Before
using the D/A converter function, you should address the following items:
D/A output register, BASE+4/BASE+5/BASE+6/BASE+7, (sec. 2.4.3)
JP1 jumper set to internal reference voltage -5V or -10V (sec. 2.3.1)
JP2 jumper set to internal or external reference voltage (sec. 2.3.2)
If JP2 is set to internal and JP1 is set to -5V, the D/A output range is 0 to 5V
If JP2 is set to internal and JP1 is set to -10V, the D/A output range is 0 to 10V
If JP2 is set to external, the external reference voltage can be AC/DC +/- 10V
The block diagram is given below:
D0..D7
OME-A-822PGL/PGH
NOTE : The D/A output latch registers use a "double buffer" structure.
send the low byte data first, then send the high byte data
only sends the high byte, the low byte data will be the previous value.
D/A channel 0
Base+4/+5
Ref
-5/-10 V
JP1
Internal
JP2
Reference
Ref
Base+6/+7
D/A channel 1
OME-A-822PGL/PGH Hardware Manual ---- 31
CN3
30
9,10,14,28,29
Analog
31
Gnd
12
32
V0+
V0-
Vref0+
Vref0-
Vref1+
Vref1-
V1+
V1-
The user must
. If the user
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