Athena IIII User Manual Rev A.00
www.diamondsystems.com
Page
4
14.
PERFORMING AN A/D CONVERSION ...................................................................................................................... 60
14.1
I
NTRODUCTION
............................................................................................................................................................... 60
14.2
S
ELECT THE
I
NPUT
C
HANNEL
............................................................................................................................................. 60
14.3
S
ELECT THE
I
NPUT
R
ANGE
................................................................................................................................................. 60
14.4
W
AIT FOR
A
NALOG
I
NPUT
C
IRCUIT TO
S
ETTLE
...................................................................................................................... 60
14.5
P
ERFORM AN
A/D
C
ONVERSION ON THE
C
URRENT
C
HANNEL
.................................................................................................. 60
14.6
W
AIT FOR THE
C
ONVERSION TO
F
INISH
............................................................................................................................... 61
14.7
R
EAD THE
D
ATA FROM THE
B
OARD
..................................................................................................................................... 61
14.8
C
ONVERT THE NUMERICAL DATA TO A MEANINGFUL VALUE
..................................................................................................... 62
14.8.1
Conversion Formula for Bipolar Input Ranges ................................................................................................... 62
14.8.2
Conversion Formula for Unipolar Input Ranges ................................................................................................. 63
15.
A/D SCAN, INTERRUPT AND FIFO OPERATION ........................................................................................................ 64
16.
DIGITAL-TO-ANALOG OUTPUT RANGES AND RESOLUTION .................................................................................... 66
16.1
D
ESCRIPTION
................................................................................................................................................................. 66
16.2
R
ESOLUTION
.................................................................................................................................................................. 66
16.3
O
UTPUT
R
ANGE
S
ELECTION
.............................................................................................................................................. 66
16.4
D/A
C
ONVERSION
F
ORMULAS AND
T
ABLES
.......................................................................................................................... 67
16.4.1
D/A Conversion Formulas for Unipolar Output Ranges ..................................................................................... 67
16.4.2
D/A Conversion Formulas for Bipolar Output Ranges ........................................................................................ 68
17.
GENERATING AN ANALOG OUTPUT ........................................................................................................................ 69
17.1
C
OMPUTE THE
D/A
C
ODE FOR THE
D
ESIRED
O
UTPUT
V
OLTAGE
............................................................................................... 69
17.2
W
RITE THE
V
ALUE TO THE
S
ELECTED
O
UTPUT
C
HANNEL
R
EGISTERS
.......................................................................................... 69
17.3
W
AIT FOR THE
D/A
TO
U
PDATE
......................................................................................................................................... 69
18.
ANALOG CIRCUIT CALIBRATION ............................................................................................................................. 70
19.
DIGITAL I/O OPERATION ........................................................................................................................................ 71
20.
COUNTER/TIMER OPERATION ................................................................................................................................ 72
20.1
C
OUNTER
0
–
A/D
S
AMPLE
C
ONTROL
................................................................................................................................ 72
20.2
C
OUNTER
1
–
C
OUNTING
/T
OTALIZING
F
UNCTIONS
................................................................................................................ 72
20.3
C
OMMAND
S
EQUENCES
................................................................................................................................................... 73
20.3.1
Load and Enable (Run) a Counter Sequence ...................................................................................................... 73
20.3.2
Read a Counter Sequence .................................................................................................................................. 73
20.3.3
Disabling the Counter Gate Command............................................................................................................... 74
20.3.4
Clearing a Counter Sequence ............................................................................................................................. 74
21.
USB FLASHDISK MODULE ....................................................................................................................................... 75
21.1
I
NSTALLING THE
F
LASHDISK
M
ODULE
.................................................................................................................................. 75
22.
BIOS OPTION LISTING ............................................................................................................................................. 76
22.1
V
IEWING AND
M
ODIFYING THE
BIOS
S
ETTINGS
.................................................................................................................... 76
22.2
BIOS
S
CREEN
D
ESCRIPTIONS
............................................................................................................................................. 77
23.
SPECIFICATIONS ..................................................................................................................................................... 80
23.1
CPU............................................................................................................................................................................. 80
23.2
D
ATA
A
CQUISITION
C
IRCUITRY
.......................................................................................................................................... 80
23.3
P
OWER
S
UPPLY
.............................................................................................................................................................. 81
23.4
G
ENERAL
....................................................................................................................................................................... 81