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Xtreme I/O Express ADC-DAC
Users Guide
Document: CTIM-00435
Revision: 0.08
Page 26 of 47
Connect Tech Inc. 800-426-8979 | 519-836-1291
Date: 2016-11-18
CH2_ZERO / CH2_GAIN (Offset 0x0014 : Read/Write)
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
Reserved / Future Use
CH2_ZERO
CH2_GAIN
CH2_ZERO
stores user-calibration data that is used to eliminate offset error
CH2_GAIN
stores user-calibration data that is used to eliminate gain error
CH3_ZERO / CH3_GAIN (Offset 0x0018 : Read/Write)
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8
7
6
5
4
3
2
1
0
Reserved / Future Use
CH3_ZERO
CH3_GAIN
CH3_ZERO
stores user-calibration data that is used to eliminate offset error
CH3_GAIN
stores user-calibration data that is used to eliminate gain error
IO_PINS_CONTROL (Offset 0x001C : Read/Write)
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8
7
6
5
4
3
2
1
0
Reserved / Future Use
UB UA RST LD
This register sets the Unipolar and Bipolar modes of the outputs for each group of DAC outputs. It is
unique among all the other registers in that it is actually a direct mapping to pins on the peripheral
bearing the same designations.
UB
0 = Sets DAC2 & DAC3 to Bipolar Mode (-10V to +10V)
1 = Sets DAC2 & DAC3 to Unipolar Mode (0V to +15V)
UA
0 = Sets DAC0 & DAC1 to Bipolar Mode (-10V to +10V)
1 = Sets DAC0 & DAC1 to Unipolar Mode (0V to +15V)
RST
0 = Take DACs output of reset (Normal Operation)
1 = Put DACs input reset state
LD
0 = Enable DAC Updating (Normal operation)
1 = Disable DAC Updating
CMD_PASSTHRU (Offset 0x0020 : Read/Write)
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8
7
6
5
4
3
2
1
0
Zeros (Must always be zeros)
Command
Addr
Command Data
This register communicates directly with the SPI connected DAC IC. Whatever data is in this register
gets shifted out to the DAC IC. This allows access to the DAC IC’s internal register bank which is
detailed below: