Texas Instruments XTR108, User Manual

Page: 15 / 65

www.ti.com
Hardware Overview
15 SBOU123A – March 2012 – Revised September 2016
Submit Documentation Feedback
Copyright © 2012–2016, Texas Instruments Incorporated
XTR108EVM-USB Evaluation Board and Software Tutorial
2.3.2 Sensor Board Jumper Settings
Table 17 explains the function of the XTR108EVM-USB Interface Board jumpers.
Table 17. Sensor Board Jumper Functions
Jumper Default Description
JMP1 FET
This jumper selects whether to enable or bypass the depletion-mode transistor Q1.
Set the jumper to the FET position when using current-output mode. Set the jumper to the
BYPASS position when using voltage-output mode.
JMP2 FET
This jumper selects whether to enable or bypass the depletion-mode transistor Q1.
Set the jumper to the FET position when using current-output mode. Set the jumper to the
BYPASS position when using voltage-output mode.
JMP3 IOUT
This jumper selects between current-output mode or voltage-output mode.
Set the jumper to the IOUT position when using current-output mode. Set the jumper to the
VOUT position when using voltage-output mode.
JMP4 NO LOAD
This jumper selects whether to connect or disconnect a load resistor (R
L
, not installed by
default) from the voltage output of the XTR108.
Set the jumper to the NO LOAD position when using current-output mode. Set the jumper to
the LOAD position when using voltage-output mode (optional).
JMP5 IOUT
This jumper selects between the current-output or voltage-mode charge pump input at the
XTR108 I_IN pin.
Set the jumper to the IOUT position when using current-output mode. Set the jumper to the
CP position when using voltage-output mode.
JMP6 BYPASS
This jumper enables or disables the SPI clock buffer in the voltage-output mode charge pump.
Set the jumper to the BYPASS position when using current-output mode. Set the jumper to
the BUF position when using voltage-output mode.
JMP7 NO CLK
This jumper enables or disables the voltage-output mode charge pump.
Set the jumper to the NO CLK position when using current-output mode. Set the jumper to the
CP SCK position when using voltage-output mode.
JMP8 2-WIRE
This jumper selects what type of RTD is connected to the XTR108.
Set the jumper to the 2-WIRE position when using the RTD emulator on the Interface Board
or when connecting an external two-wire RTD. Set the jumper to the 3-WIRE position when
connecting an external three-wire RTD.