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LMP91200 Evaluation Board User Guide
LMP91200 Evaluation Board User Guide
(551600628-001 RevB)
The LMP91200 evalboard (LMP91200EVAL) can be used as stand-alone or as part of SensorAFE eval
platform (refer to SensorAFE platform
http://www.national.com/en/industrial/sensing/sensor_afe/tools.html
for software and required hardware). It allows configuring the LMP91200 through a 3-wire SPI interface and
testing the device with real PH probe. Moreover the eval board allows the connection of external RTD (for
instance Pt100, Pt1000).
Figure 1 LMP91200EVAL
1. PH probe and RTD connection
The LMP91200 evalboard is not provided with any PH probe and RTD.
The PH probe can be connected to the BNC connector labeled PH_SENSOR.
The footprint of PH_SENSOR allows the connection of a Triaxial BNC. So in case of need replace the BNC
soldered on the eval board with a triaxial BNC (refer to Schematic section to check the pinout of the Triaxial
BNC).
The external RTD can be connected to the RTD_IN connector. The eval board is already provided with two
reference resistors labeled R_CAL_100 and R_CAL_1000, but in case of need an external reference
resistor can be connected to the T_CAL_EXT connector.
After the connection of the RTD, configure the JP6 according to the table below
Jumper name
Configuration
Description
JP6
Select
one of
the three
options
1-3
shorted
Reference resistor = 100ohm, when a Pt100 is
connected to the board
3-5
shorted
Reference resistor = 1000ohm, when a Pt1000 is
connected to the board
4-6
shorted
External reference resistor
Rev 0.7
Verzeichnis
- ・ Blockdiagramm on Seite 1 Seite 6
- ・ Anwendungsbereich on Seite 10 Seite 13
