Datasheet

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23 Save Model File ........................................................................................................... 35
24 XTR108EVM-USB Software, Manual Calibration Tab................................................................ 36
25 Adjust RTD Emulator...................................................................................................... 37
26 Manual Calibration Tab, Post-Calibration .............................................................................. 39
27 XTR108EVM-USB Software, Automatic Calibration Tab............................................................. 40
28 Automatic Calibration Tab, Post-Calibration ........................................................................... 42
29 XTR108EVM-USB Software, Registers Tab ........................................................................... 43
30 GPIO Control Window .................................................................................................... 45
31 Debug Window............................................................................................................. 46
32 About Window.............................................................................................................. 46
33 Discrete Charge Pump on Sensor Interface Board ................................................................... 47
34 XTR108EVM-USB Interface Board Schematic ........................................................................ 48
35 XTR108EVM-USB Sensor Board Schematic .......................................................................... 49
36 XTR108 Input MUX Example (T
MIN
= –200°C, PT100 RTD) ......................................................... 52
37 XTR108 Input MUX Example (T
MAX
= +850°C, PT100 RTD) ........................................................ 53
38 XTR108 Input MUX Example (T
MAX
= +850°C, PT1000 RTD) ....................................................... 53
39 R
SET
Circuitry ............................................................................................................... 54
40 R
LIN
Circuitry ................................................................................................................ 54
41 Linearity Correction Method.............................................................................................. 55
42 Linearity Improvement .................................................................................................... 55
List of Tables
1 XTR108EVM-USB Kit Contents........................................................................................... 5
2 Related Documentation .................................................................................................... 6
3 Multimeter Connect Pinout ................................................................................................ 9
4 J1 Pinout (15-Pin Female DSUB)......................................................................................... 9
5 J2 Pinout (Vo_XTR108).................................................................................................... 9
6 J3 Pinout (Io_XTR108) ................................................................................................... 10
7 J4 Pinout (Loop Supply) .................................................................................................. 10
8 J5 Pinout (25-Pin Female DSUB) ....................................................................................... 10
9 J6 Pinout (25-Pin Male DSUB) .......................................................................................... 11
10 J7 Pinout (SPI)............................................................................................................. 11
11 J8 Pinout (RTD_CON) .................................................................................................... 12
12 Interface Board Jumper Functions ...................................................................................... 12
13 J1 Pinout (SPI)............................................................................................................. 14
14 J3 Pinout (Io_XTR108) ................................................................................................... 14
15 J4 Pinout (Vo_XTR108) .................................................................................................. 14
16 J5 Pinout (RTD_CON) .................................................................................................... 14
17 Sensor Board Jumper Functions ........................................................................................ 15
18 XTR108EVM-USB Interface Board Default Jumper Settings........................................................ 23
19 XTR108EVM-USB Sensor Board Default Jumper Settings.......................................................... 25
20 PGA Gain, Loop Transconductance, and Input Full-Scale Differential Voltage................................... 28
21 Equations for Calculating Zero Output.................................................................................. 28
22 Equations for Calculating I
REF
Current .................................................................................. 29
23 Overscale Threshold ...................................................................................................... 30
24 Underscale Threshold..................................................................................................... 30
25 Alarm Configuration Register ............................................................................................ 31
26 Standard RTD Equations................................................................................................. 33
27 Control Bits Functions .................................................................................................... 45
2
XTR108EVM-USB Evaluation Board and Software Tutorial SBOU123–March 2012
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