Omega Engineering OME-A8111 - Manual (Page 4)

Table of Contents
1. Introduction_________________________________________________________ 4
1.1 General Description ___________________________________________________ 4
1.2 Features _____________________________________________________________ 4
1.3 Specifications _________________________________________________________ 5
1.3.1 Power Consumption _________________________________________________________ 5
1.3.2 Analog Inputs ______________________________________________________________ 5
1.3.3 A/D Converter _____________________________________________________________ 5
1.3.4 DA Converter ______________________________________________________________ 6
1.3.5 Digital I/O_________________________________________________________________ 6
1.3.6 Interrupt Channel ___________________________________________________________ 6
1.3.7 Programmable Timer/Counter _________________________________________________ 7
1.3.8 Applications _______________________________________________________________ 7
1.4 Product Check List ____________________________________________________ 7
2. Hardware Configuration ______________________________________________ 8
2.1 Board Layout_________________________________________________________ 8
2.2 I/O Base Address Setting _______________________________________________ 9
2.3 Jumper Setting ______________________________________________________ 10
2.3.1 JP1 : D/A Internal Reference Voltage Selection_____________________________________ 10
2.4 I/O Register Address__________________________________________________ 11
2.4.1 The 8254 Counter __________________________________________________________ 12
2.4.2 A/D Input Buffer Register ___________________________________________________ 12
2.4.3 D/A Output Latch Register ___________________________________________________ 13
2.4.4 D/I Input Buffer Register ____________________________________________________ 13
2.4.5 Clear Interrupt Request______________________________________________________ 14
2.4.6 A/D Gain Control Register ___________________________________________________ 14
2.4.7 A/D Multiplex Control Register _______________________________________________ 15
2.4.8 A/D Mode Control Register __________________________________________________ 16
2.4.9 A/D Software Trigger Control Register _________________________________________ 17
2.4.10 D/O Output Latch Register __________________________________________________ 18
2.5 Digital I/O __________________________________________________________ 19
2.6 8254 Timer/Counter __________________________________________________ 20
2.7 A/D Conversion ______________________________________________________ 21
2.7.1 A/D conversion flow__________________________________________________________ 22
OME-A-8111 Hardware Manual (ver.1.1, Jul/2003) 2