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Texas Instruments LMP92018 Analog System Monitor and Controller User guides
National Semiconductor
LMP92018SQEVAL User’s Guide
October 25, 2011
Rev – 1.00
RoHS Compliant
Evaluation Board User's Guide
LMP92018 Analog System Monitor and Controller
 2011 National Semiconductor Corporation
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National Semiconductor
LMP92018SQEVAL User’s Guide
1. Kit Components
Item
Qty.
Description
LMP92018SQEVAL
1
LMP92018SQ Device evaluation board
SPUSI2
1
USB interface board purchased separately at:
http://www.national.com/store/view_item/index.html?nsid=SPUSI2
 2011 National Semiconductor Corporation
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LMP92018SQEVAL User’s Guide
2. Software Installation
TinyI2CSPI software, and LMP92018 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, or Windows 7 32bit
environments. At present Windows 7 64bit is not supported.
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.
 2011 National Semiconductor Corporation
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National Semiconductor
LMP92018SQEVAL User’s Guide
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 VDD and GND screw terminals
• Supply desired potential to the VREF and VGPIO screw terminals. For example, install
jumper wires between VDD and VREF, and VDD and VGPIO screw terminal pairs.
• Connect the SPUSI2 dongle to the LMP92018SQEVAL board 14-pin header marked GPSI14 (watch the alignment, the evaluation 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:
 2011 National Semiconductor Corporation
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National Semiconductor
LMP92018SQEVAL 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
Default
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
Selects externally supplied voltage, via REF screw terminal, as the
input to REF pin of LMP92018. To select locally generated 4.1V
reference voltage move the shunt to LOCAL position. NOTE: if
LMP92018 is programmed to source the internally generated
reference voltage, this shunt must be removed.
Selects the 3.3V potential generated by the SPUSI2 dongle as the
SPI interface rail. Use VIO screw terminal and move the shunt to
EXT position to supply external voltage as the SPI rail reference.
REF_SEL
EXT
VIO_SEL
SPUSI_3V3
IN1_TO_OUT1
not present
Shunt will connect the output OUT0 (DAC0) to the analog input
IN0 (ADC0)
TO_IN1
not present
Shunt will connect VDD sense resistive divider output to analog
input IN0 (ADC0)
Once the above jumpers are in place, turn on the 5V power supply
 2011 National Semiconductor Corporation
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National Semiconductor
LMP92018SQEVAL 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 SPI to open new SPI interface
command window and enter your own sequences.
NOTE: Personality files are text files containing SPI bus sequences. The files are either
available for download from the TinyI2CSPI Software web page, or are provided in the
archive containing this document.
 2011 National Semiconductor Corporation
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National Semiconductor
LMP92018SQEVAL User’s Guide
6. Quick Example
Insert shunt in the IN1_TO_OUT1 header prior to executing the instructions below.
Load in the ADC.tpf personality file. The screen will look as follows:
NOTE: CKPOL and CKPHA values determine the phase and polarity relationship between the SPI
data (DOUT/DIN) and serial clock (SCLK). Values as shown above are required for proper
operation of the LMP92018 SPI bus.
In the figure above each line represents a single SPI bus transaction. MOSI is the 24 bit value that
will be shifted into the LMP92018. MISO will contain data returned from LMP92018 during the
same frame.
To execute a transaction, press “Execute” button at the end of the corresponding line. At the
beginning it is advisable to execute transactions in order listed.
The example above will program LMP92018 to use internal reference block as the reference source
to both ADC and the DACs. The DAC0 will source out ½FS (Full Scale) via the on-board shunt to
the ADC0 input. As the result the “Read ADC0” transaction will result ½FS value returned from the
 2011 National Semiconductor Corporation
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LMP92018SQEVAL User’s Guide
LMP92018. The value returned from the LMP92018 will be shown in MOSI column of line 5
(NOOP)
NOTE: Read operations from LMP92018 require 2 SPI transactions: one to issue READ command,
and one to shift out the requested content. NOOP in line 6 is used to complete the data shift
operation out of the LMP92018
 2011 National Semiconductor Corporation
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National Semiconductor
LMP92018SQEVAL User’s Guide
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 2011 National Semiconductor Corporation
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