Omega Engineering OME-A8111 manual 7 A/D Multiplex Control Register

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2.4.7A/D Multiplex Control Register

(WRITE)	Base+A : A/D Multiplexer Control Register Format
Bit 7	Bit 6	Bit 5	Bit 4	Bit 3	Bit 2	Bit 1	Bit 0
X	X	X	X	X	D2	D1	D0

A/D input channel selection data =3 bits: D2...D0, D2=MSB, D0=LSB, X=don‘t care

Channel	Bit_2	Bit_1	Bit_0
0	0	0	0
1	0	0	1
2	0	1	0
3	0	1	1
4	1	0	0
5	1	0	1
6	1	1	0
7	1	1	1

NOTE: The settling time of the multiplexer depends on the source resistance of input

sources.
Approx. Source resistance = 0.1 KΩ	Î Approx. Settling time =	3 µs.
Approx. Source resistance = 1 KΩ	Î Approx. Settling time = 5	µs.
Approx. Source resistance = 10 KΩ	Î Approx. Settling time = 10 µs.
Approx. Source resistance = 100 KΩ	Î Approx. Settling time = 100 µs.

Sec 2.4.6 gives information about settling time delay.

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

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Contents User’sGuide Mexico CanadaBenelux Czech RepublicOME-A-8111 Table of Contents Calibration General Description FeaturesPower Consumption SpecificationsAnalog Inputs 3 A/D ConverterInterrupt Channel DA ConverterDigital I/O Applications Programmable Timer/CounterProduct Check List Board Layout Hardware ConfigurationDefault base address is I/O Base Address Setting1 JP1 D/A Internal Reference Voltage Selection Jumper SettingAddress Read Write I/O Register Address 2 A/D Input Buffer Register 8254 Counter4 D/I Input Buffer Register 3 D/A Output Latch Register6 A/D Gain Control Register Clear Interrupt Request7 A/D Multiplex Control Register SI2 SI1 SI0 8 A/D Mode Control Register9 A/D Software Trigger Control Register 10 D/O Output Latch Register CN3 Digital I/OCounter 8254 Timer/CounterSec A/D ConversionPacer Trigger Mode If switching from one channel to the next sec1 A/D conversion flow 2 A/D Conversion Trigger Modes3 A/D Transfer Modes Using software trigger and polling transferD/A Conversion Signal Shielding Analog Input Signal ConnectionCN1 Analog input/Analog output/Connect Pin Assignment Pin AssignmentCN3 Analog input/Analog output/Connect Pin Assignment CN2 Analog input/Analog output/Connect Pin AssignmentOME-CA-4002 Daughter BoardOME-DB-16P OME-DB-16RCalibration VR Description CalibrationA/D Calibration Steps DI/O TestingD/A Calibration Steps WARRANTY/DISCLAIMER Temperature