Omega Engineering OME-A8111 manual D/A Conversion

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2.8 D/A Conversion

The OME-A-8111 provides two 12-bit D/A converters. Before using the D/A conversion function, user should notice the following issues:

zD/A output register, BASE+4/BASE+5/BASE+6/BASE+7 (sec. 2.4.3).

zJP1/JP2 selects internal/external reference voltage (sec. 2.4.1).

NOTE: The DA output latch registers are designed as a “double buffered” structure. The

user must send the low byte data first, then send the high byte data to store the DA 12-bit digital data. If the user only sends the high byte

data, then the low byte data will be still the previous value. Also, if the user sends high byte first then sends low byte, the low byte data of DA is still held in the previous one.

OME-A-8111 Hardware Manual (ver.1.1, Jul/2003)

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Contents User’sGuide Benelux CanadaMexico Czech RepublicOME-A-8111 Table of Contents Calibration Features General DescriptionAnalog Inputs SpecificationsPower Consumption 3 A/D ConverterInterrupt Channel DA ConverterDigital I/O Applications Programmable Timer/CounterProduct Check List Hardware Configuration Board LayoutI/O Base Address Setting Default base address isJumper Setting 1 JP1 D/A Internal Reference Voltage SelectionI/O Register Address Address Read Write8254 Counter 2 A/D Input Buffer Register3 D/A Output Latch Register 4 D/I Input Buffer RegisterClear Interrupt Request 6 A/D Gain Control Register7 A/D Multiplex Control Register 8 A/D Mode Control Register SI2 SI1 SI09 A/D Software Trigger Control Register 10 D/O Output Latch Register Digital I/O CN38254 Timer/Counter CounterA/D Conversion Sec1 A/D conversion flow If switching from one channel to the next secPacer Trigger Mode 2 A/D Conversion Trigger ModesUsing software trigger and polling transfer 3 A/D Transfer ModesD/A Conversion Analog Input Signal Connection Signal ShieldingPin Assignment CN1 Analog input/Analog output/Connect Pin AssignmentCN2 Analog input/Analog output/Connect Pin Assignment CN3 Analog input/Analog output/Connect Pin AssignmentOME-DB-16P Daughter BoardOME-CA-4002 OME-DB-16RCalibration Calibration VR DescriptionA/D Calibration Steps DI/O TestingD/A Calibration Steps WARRANTY/DISCLAIMER Temperature