D/A Conversion | Omega Engineering OME-A8111 instruction

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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Omega Engineering OME-A8111 manual D/A Conversion

Contents

User’sGuide Benelux CanadaMexico Czech Republic OME-A-8111 Table of Contents Calibration Features General Description Analog Inputs SpecificationsPower Consumption 3 A/D Converter Interrupt Channel DA ConverterDigital I/O Applications Programmable Timer/CounterProduct Check List Hardware Configuration Board Layout I/O Base Address Setting Default base address is Jumper Setting 1 JP1 D/A Internal Reference Voltage Selection I/O Register Address Address Read Write 8254 Counter 2 A/D Input Buffer Register 3 D/A Output Latch Register 4 D/I Input Buffer Register Clear Interrupt Request 6 A/D Gain Control Register 7 A/D Multiplex Control Register 8 A/D Mode Control Register SI2 SI1 SI0 9 A/D Software Trigger Control Register 10 D/O Output Latch Register Digital I/O CN3 8254 Timer/Counter Counter A/D Conversion Sec 1 A/D conversion flow If switching from one channel to the next secPacer Trigger Mode 2 A/D Conversion Trigger Modes Using software trigger and polling transfer 3 A/D Transfer Modes D/A Conversion Analog Input Signal Connection Signal Shielding Pin Assignment CN1 Analog input/Analog output/Connect Pin Assignment CN2 Analog input/Analog output/Connect Pin Assignment CN3 Analog input/Analog output/Connect Pin Assignment OME-DB-16P Daughter BoardOME-CA-4002 OME-DB-16R Calibration Calibration VR Description A/D Calibration Steps DI/O TestingD/A Calibration Steps WARRANTY/DISCLAIMER Temperature