IC-GD datasheet(21/55 Pages) ICHAUS

21 / 55 page

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iC-GD

UNIVERSAL I/O INTERFACE

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

0x8000

10.499 V

0x7FFC

0. . . 20 mA

0 mA

0x0000

20.999 mA

0xFFFC

4. . . 20 mA

4 mA

0x0000

20.999 mA

0xFFFC

0. . . 2 mA

0 mA

0x0000

2.0999 mA

0xFFFC

0. . . 200 µA

0 mA

0x0000

209.99 µA

0xFFFC

Table 7: Output ranges of the analog outputs

Accuracy of output ranges

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

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-

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 Digital value

Thermo couple,

0 K

0x0000

PT sensor

6,553.5 K

0xFFFF

Table 9: Temperature range

Thermo couples

Typ

Temperature range

Valid range

-100. . . 1200 °C

0x06C4. . . 0x398B

-100. . . 1370 °C

0x06C4. . . 0x402F

-100. . . 400 °C

0x06C4. . . 0x1A4B

-100. . . 1300 °C

0x06C4. . . 0x3D73

-100. . . 1000 °C

0x06C4. . . 0x31BB

-50. . . 1768 °C

0x08B8. . . 0x4FBB

-50. . . 1768 °C

0x08B8. . . 0x4FBB

600. . . 1820 °C

0x221C. . . 0x51C3

PT sensors

Typ

Temperature range

Valid range

PT-100

-100. . . 800 °C

0x06C4. . . 0x29EB

PT-1000

-100. . . 800 °C

0x06C4. . . 0x29EB

Table 10: Temperature measurement

Accuracy of the temperature ranges

25 °C -40...100 °C -40...120 °C

TE Type J

1.95 °C

3.9 °C

7.8 °C

TE Type K

2.21 °C

4.41 °C

8.82 °C

TE Type T

0.75 °C

1.5 °C

3.0 °C

TE Type N

2.1 °C

4.2 °C

8.4 °C

TE Type E

1.65 °C

3.3 °C

6.6 °C

TE Type R

2.73 °C

5.45 °C

10.9 °C

TE Type S

2.73 °C

5.45 °C

10.9 °C

TE Type B

1.83 °C

3.66 °C

7.32 °C

PT100, PT1000 1.35 °C

2.7 °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.

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