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Texas Instruments LMP92001 Sensor AFE Evaluation Board User guides
LMP92001 Evaluation Board
User’s Guide
1.
Kit Components
Item
Qty.
Description
LMP92001 Eval
Board
1
Device evaluation board
SPUSI2
1
USB interface board purchased separately at:
http://www.national.com/store/view_item/index.html?nsid=SPUSI2
2. Software Installation
TinyI2CSPI software, and LMP92001 specific Personality Files, can be obtained from the National
Semiconductor Corp. website. Use the link below to download the self extracting archive and the
installation manual.
http://www.national.com/analog/webench/sensors/spusi2
Follow the instructions and install the software in the Windows XP environment.
When connecting SPUSI2 for the first time to your PC the operating system will attempt to install the
appropriate drivers. Follow the instructions on the screen and allow the wizard to automatically search for
required driver files.
3. Kit Assembly
Equipment needed to conduct basic functionality tests:
• 5V power supply
• DC Voltmeter
Assemble the kit as follows:
• Connect 5V power supply (power off) to +Vsupply and GND banana sockets
• Connect the SPUSI2 dongle to the LMP92001 Eval Board 14-pin header marked GPSI-14 (watch
the alignment, the Eval Board connector is actually 16-pin, see picture below for correct
alignment)
• Connect USB cable between host PC and the SPUSI2 dongle
Figure below shows the complete assembly:
© 2009 National Semiconductor Corporation
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User’s Guide
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LMP92001 Evaluation Board
User’s Guide
4.
Default Set-Up and Power-Up
Verify the following default jumper settings on the Eval Board (these should already be factory set):
Jumper block
Shunt position
Function
IDD_sense
in
This header allows for measurement of supply to the DUT (only to
the DUT). This header should have a shunt installed
DREF
Local,DREF
Selects a locally generated 4.1V voltage as the reference input to
the DUT’s DACs (DUT by default uses off-ship reference source)
AREF
Local, AREF
Selects a locally generated 4.1V voltage as the reference input to
the DUT’s ADC (DUT by default uses off-ship reference source)
Pullup_Rail_Sel
I2C_3.3
Selects the 3.3V potential generated by the I2C interface dongle
as the GPIO, INT[2:1] pull-up rail.
AS1
H
Sets the upper address bit of the DUT’s I2C bus address
AS0
L
Sets the lower address bit of the DUT’s I2C bus address.
NOTE: The factory set address is AS1,AS0=H,L which
corresponds to I2C address 0x4C
Once the above jumpers are in place, turn on the 5V power supply
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User’s Guide
5. TinyI2CSPI User Interface Software
Start TinyI2CSPI User Interface software (START->TinyI2CSPI->RunTinyI2CSPI)
NOTE: Currently on some systems the software does not start properly using method described above: a
command window flashes on the screen momentarily, but GUI never starts. If this occurs in your system
start the software by START->TinyI2CSPI-> TinyI2CSPI Environment. This will open a command window.
At the prompt:
C:\...\TinyI2CSPI> cd dist
C:\...\TinyI2CSPI \dist\> tinyi2cspi.exe
This will launch the GUI
The initial screen will look as below:
Use the Load button to select and load personality files. Or use Add I2C to open new I2C interface
command window and enter your own sequences.
NOTE: Personality files are text files containing I2C bus sequences. The files are either available
for download from the TinyI2CSPI Software web page, or are provided in the archive containing
this document.
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User’s Guide
6. Quick example
Load in the WriteAllDAC.txt personality file. The screen will look as follows:
Note the DUT address 0x4C (as set on the Eval Board, see sec. 4 of this manual). Executing this script
will send data to DUT register address 0x90 (updates all on-board DAC registers to ½ scale), and will
disable the OFF bit in CDAC register i.e. all DAC outputs will be activated.
Press Write All. Successful transaction will cause items in the ERROR column to turn GREEN or display
‘OK’ string
Use the voltmeter to check the output voltages at all OUT1 through OUT12 pins: 2.05V (approx)
NOTE: Personality files provided with this product may have extensions tpf or txt
© 2009 National Semiconductor Corporation
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