Analog Input; Software Configuration; External Connections; Calibration - VersaLogic Python EBX-11 Reference Manual

Analog Input

The EBX-11 employs a multi-range, 12-bit A/D converter that accepts up to eight single-ended
input signals. The converter features 500k samples per second, with input range of 0 to +4.095V.
The A/D converter is accessed through the SPI interface.
S C
OFTWARE ONFIGURATION
Configure the SPX registers for Analog Input as shown in Table 22. The EBX-11 cannot be
configured to issue an interrupt upon completion of an A/D conversion, so the software must poll
the BUSY bit to determine when the conversion is complete.
E C
XTERNAL ONNECTIONS
Single-ended analog voltages are applied to connectors J8 and J9 of the CBR-4004 board
(connected to J5 of the EBX-11) as shown in the following table.
J5
Pin
31
32
33
34
35
36
37
38
39
40
C
ALIBRATION
There are no calibration adjustments. Calibration, if desired, is accomplished by mathematical
transformation in software.
EBX-11 Reference manual
Table 25: Analog Input Connector
CBR-4004
Signal J5 Pin
ADCH0 31
ADCH1 32
ADCH2 33
ADCH3 34
ADGND 35
ADCH4 36
ADCH5 37
ADCH6 38
ADCH7 39
ADGND 40
Interfaces and Connectors
CBR-4004 CBR-4004
Connector Pin (Signal)
1 (IO25)
J8
2 (IO26)
Analog
3 (IO27)
4 (I028)
5 (GND4)
J9 1 (IO29)
Analog 2 (IO30)
3 (IO31)
4 (IO32)
5 (GND4)
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