Analog Configuration: Base+11 (Write)
Bit:
7
6
5
4
3
2
1
0
Name:
-
-
SCINT1
SCINT0
RANGE
ADBU
G1
G0
SCINT1-0 Scan interval. This is the time between A/D samples when performing a scan (SCANEN = 1). The
driver sets a default of 10μs.
SCINT1
SCINT0
Interval
0
0
20µS
0
1
15µS
1
0
10µS
1
1
4µS
RANGE
5V or 10V A/D positive full-scale voltage (0 = 5V, 1 = 10V)
ADBU
A/D bipolar/unipolar setting; 0 = bipolar, 1 = unipolar. These control bits define the A/D input range
for a gain setting of 1.
RANGE
ADBU
A/D Range
0
0
+/- 5V
0
1
0-5V
1
0
+/- 10V
1
1
0-10V
G1-0
A/D programmable gain amplifier setting:
G1
G0
Gain
0
0
1
0
1
2
1
0
4
1
1
8
The gain setting is the ratio between the full-scale voltage range at the A/D converter and the full-scale
voltage range at the input to the board. The gain should never cause the input signal to exceed the
range of the A/D, because incorrect measurements will result (clipping).
The A/D full-scale voltage range is defined by the RANGE and ADBU bits above. To calculate the
optimum gain setting, select the highest gain that does not allow the input signal to exceed the selected
A/D range over its entire expected fluctuation range. Note that these settings can be changed at any
time, even between A/D conversions, so you can tune the board’s settings to each input signal.
Note: On power up or system reset, the board is configured for A/D bipolar mode, input range = ±5V,
and gain = 1, corresponding to all zeros in this register.
Diamond Systems Corporation
Poseidon User Manual
Page 65
