IC-GD Datasheet, PDF (21/55 Pages) IC-Haus GmbH – UNIVERSAL I/O INTERFACE

iC-GD
UNIVERSAL I/O INTERFACE
preliminary
Rev A1, Page 21/55
Both voltage and current outputs must be calibrated
to reach the specified accuracy. The accuracy accord-
ing to the characteristics O02 to O05 is summarized in
table 8.
Output ranges
Range Maximum ratings Digital values
±10 V
-10.500 V
10.499 V
0x8000
0x7FFC
0. . . 20 mA
0 mA
20.999 mA
0x0000
0xFFFC
4. . . 20 mA
4 mA
20.999 mA
0x0000
0xFFFC
0. . . 2 mA
0 mA
2.0999 mA
0x0000
0xFFFC
0. . . 200 µA
0 mA
209.99 µA
0x0000
0xFFFC
Table 7: Output ranges of the analog outputs
Accuracy of output ranges
Tj
25 °C -40...100 °C -40...120 °C
±10 V 5.25 mV
21 mV
42 mV
0. . . 20 mA 42 µA
84 µA
168 µA
4. . . 20 mA 34 µA
68 µA
136 µA
0. . . 2 mA 4.2 µA
8.4 µA
16.8 µA
0. . . 200 µA 0.42 µA
0.84 µA
1.68 µA
earization can also be used. The accuracy according
to the Electrical Characteristics Item No. S06 is sum-
marized in table 11.
Temperature range
Range
Maximum ratings
Thermo couple,
0K
PT sensor
6,553.5 K
Digital value
0x0000
0xFFFF
Table 9: Temperature range
Thermo couples
Typ
Temperature range
J
-100. . . 1200 °C
K
-100. . . 1370 °C
T
-100. . . 400 °C
N
-100. . . 1300 °C
E
-100. . . 1000 °C
R
-50. . . 1768 °C
S
-50. . . 1768 °C
B
600. . . 1820 °C
PT sensors
Typ
Temperature range
PT-100
-100. . . 800 °C
PT-1000 -100. . . 800 °C
Valid range
0x06C4. . . 0x398B
0x06C4. . . 0x402F
0x06C4. . . 0x1A4B
0x06C4. . . 0x3D73
0x06C4. . . 0x31BB
0x08B8. . . 0x4FBB
0x08B8. . . 0x4FBB
0x221C. . . 0x51C3
Valid range
0x06C4. . . 0x29EB
0x06C4. . . 0x29EB
Table 10: Temperature measurement
Table 8: Accuracy of the output ranges depending on
chip temperature
Thermocouples and PT temperature sensors
Table 10 shows the supported thermocouples and PT
temperature sensors. The temperature is determined
with a resolution of 0.1 K.
To calculate the temperature of the thermocouples at
the measuring point, the cold junction temperature is
also required. The cold junction temperature needs to
be stored as a digital value in the range of -20...105 °C
for both channels and in the same format as the tem-
perature itself via the SPI in the register TEMP_KSK.
The cold junction temperature is limited internally to its
valid range. The linearization of the measuring temper-
ature continues, even when leaving the valid temper-
ature range (see table 10). This prevents an overflow
of the number range. Additionally, the negative range
is limited to -209.15 °C. The upper and lower values
of temperature range apply as threshold values for the
range excess. This is compared to the final calculated
temperature, i.e. for the thermocouples after cold junc-
tion compensation. Table 65 shows by way of example
further settings for additional PT features for which lin-
Accuracy of the temperature ranges
Tj
25 °C -40...100 °C
TE Type J 1.95 °C
3.9 °C
TE Type K 2.21 °C
4.41 °C
TE Type T 0.75 °C
1.5 °C
TE Type N 2.1 °C
4.2 °C
TE Type E 1.65 °C
3.3 °C
TE Type R 2.73 °C
5.45 °C
TE Type S 2.73 °C
5.45 °C
TE Type B 1.83 °C
3.66 °C
PT100, PT1000 1.35 °C
2.7 °C
-40...120 °C
7.8 °C
8.82 °C
3.0 °C
8.4 °C
6.6 °C
10.9 °C
10.9 °C
7.32 °C
5.4 °C
Table 11: Accuracy of the temperature ranges depend-
ing on chip temperature
Diagnostic measurements
For diagnostic purposes, several voltages and the cur-
rents in the outputs IAx as well as internal reference
voltages can be measured by a 14 bit ADC. The con-
verter maps the voltage range of 0 to 5.25 µA or 0 to
60 µA respectively with a 14-bit resolution to the digital
values DAC[13:0] of 0x0000 to 0x3FFF. Due to internal
limitations, the actual usable measuring range is lower
as shown in table 12.