User's Manual

Chapter 3 - Development Environment Landis+Gyr
32 98-1546 Rev AA UtiliNet SCADA Single Board Radio
This A/D converter has the following specifications:
The actual sampling time is 0.25 µS and the conversion time is 2.75 µS, but the rate at which signals
on these inputs can be sampled in-practice is limited by the DCW execution. It is recommended that
these channels be used only for DC voltage measurement, and that the sampling rate can not exceed
100 mS.
The register below can be used to control either of the two general purpose Analog pins (A1 & A2).
Table 3-2.
A/D characteristic Specification
Resolution 10 bit
INL +/-5 LSB
Absolute Accuracy +/-5 LSB
DNL +/-1 LSB
Offset Error +/-3 LSB
Gain Error +/-3 LSB
Table 3-3. Control Register 2
Bit Feature Description Dflt.
0 Pin A1 Direction 0: Input
1: Output
0
1 Pin A1 State When A1, bit 0 is "0" and bit 2 is "0", then bit 1 returns current
state as "0" or "1".
When A1, bit 0 is "0" and bit 2 is "1", then read location 7702-
7703 which returns the Hex value of the sampled voltage between
0-2.5 VDC.
When A1, bit 0 is "1", then the value of bit 1 can be set.
0
2 Pin A1 Control 0: General Purpose I/O
1: Analog to Digital Channel (Bit 0 = "0" only)
0
3 Reserved Not Used 0
4 Pin A2 Direction 0: Input
1: Output
0
5 Pin A2 State When A2, bit 4 is "0" and bit 6 is "0", then bit 5 returns current
state as "0" or "1".
When A2, bit 4 is "0" and bit 6 is "1", then read location 7704-
7705 which returns the Hex value of the sampled voltage between
0-2.5 VDC.
When A2, bit 4 is "1", then the value of bit 5 can be set.
0
6 Pin A2 Control 0: General Purpose I/O
1: Analog to Digital Channel (Bit 0 = "0" only)
0
7 Reserved Not Used 0