Texas Instruments LMP92066 User manual

Using the LMP92066 Evaluation Module
User's Guide
Literature Number: SNAU153
MARCH 2014

Contents
1 Quick Start ......................................................................................................................... 5
1.1 Software Installation ..................................................................................................... 5
1.2 Kit Assembly ............................................................................................................. 5
1.3 Software Startup ......................................................................................................... 6
1.4 VDACx vs Temperature Sweep ......................................................................................... 11
2 Schematic ......................................................................................................................... 13
2Table of Contents SNAU153–MARCH 2014
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User's Guide
SNAU153–MARCH 2014
LMP92066 Dual Temperature-Controlled DAC Evaluation
Module
Introduction
The LMP92066EVM is designed for rapid evaluation of functionality and performance of the LMP92066
GaN and LDMOS PA Bias Controller.
Kit Components
ITEM DESCRIPTION
LMP92066EVM Evaluation Board LMP92066 device
USB2Any Interface dongle – USB to I2C bus
Software. Available from the Texas Instruments website.
Please contact your TI representative for access authorization.
LMP92066 EVM GUI The installer and the application have been developed for Windows XP and Windows 7, 32-
and 64-bit environments.
Evaluation Module – LMP92066EVM
The LMP92066EVM is a connectivity board: provisions are made for ease of interfacing LMP92066 to the
lab test equipment and the I2C bus controller. The only active device on the board is the LMP92066
device.
The EVM, by default, is powered from the USB2Any interface board, which in turn is powered from the
host PC USB port. The user can provide external supplies via the SUPPLY terminal block. All digital and
analog I/O is accessible via the dual row headers: J1 and J2.
CONNECTOR DESCRIPTION
Interface to the USB2Amy board.
11 – SDA. I2C interface bidirectional data.
12 – SCL. I2C interface clock input.
16 – 3.3V supply to the EVM.
J1 17 – A0. By default not connected to the LMP92066
18 – A1. By default not connected to the LMP92066
19 – DRVEN0.
20 – DRVEN1
28 – 5.0V supply to EVM
Analog outputs from LMP92066.
2 – A1
4 – A0
J2 6 – DAC1 output
8 – FETDRV1 output
12 – FETDRV0 output
14 – DAC0 output
External power supply block.
1 – VDD
2 – VIO
SUPPLY 3 – GND
4 – VDDB
5 – VSSB
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SELECTOR BLOCK DESCRIPTION FACTORY SETTING
J3 VDD source:
1-2: External via SUPPLY block 2 - 3
2-3: Provided by J2-28
J4 VIO source:
1-2: External via SUPPLY block 2 - 3
2-3: Provided by J2-16
J5 VDDB source:
1-2: External via SUPPLY block 2 - 3
2-3: Provided by J2-28
J6 VSSB source:
1-2: External via SUPPLY block 2 - 3
2-3: Local ground (GND)
J7 I2C bus slave address A1 input control:
No Shunt – A1 = N.C.
1-2 – A1 = HI The I2C slave address of the LMP92066
2-3 – A1 = LO is set to A1 = LO, A0 = LO. This
corresponds to the I2C slave address =
J8 I2C bus slave address A1 input control: 0111111 = 0x3F
No Shunt – A0 = N.C.
1-2 – A0 = HI
2-3 – A0 = LO
J9 DRVEN0 manual control: DRVEN0 is forced LO by a shunt,
No Shunt – DRVEN0 controlled by J2-19 input disabling the FETDRV0 output. Remove
1-2 – DRVEN0 forced HI the shunt to enable FETDRV0.
2-3 – DRVEN0 forced LO
J10 DRVEN1 manual control: DRVEN1 is forced LO by a shunt,
No Shunt – DRVEN1 controlled by J2-20 input disabling the FETDRV0 output. Remove
1-2 – DRVEN1 forced HI the shunt to enable FETDRV1.
2-3 – DRVEN1 forced LO
USB to I2C interface – USB2Any
USB2Any is provided as an interface between the PC and the LMP92066EVM. This interface is user
controlled via the application LMP92066EVM GUI.
USB2Any is provided as either enclosed or unenclosed unit.
The LMP92066EVM plugs in directly to USB2Any. For in-system evaluation of the LMP92066, a ribbon
cable is provided for connecting of USB2Any to a target system equipped with a suitable header.
Figure 1. USBAny
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User Software
The LMP92066EVM GUI application software is available as a download from the Texas Instruments
website (www.ti.com). With this software and the USB2Any interface dongle the user will be able to fully
exercise the functionality of the LMP92066, including:
• Read and Write operations from and to internal registers of the LMP92066.
• Control the DRVENx inputs of the LMP92066.
• Write data into the internal EEPROM.
• Plot and log, in real time, the Temperature Sensor output and DAC input data.
• Plot and log the VDACx vs Temperature transfer function.
1 Quick Start
1.1 Software Installation
To install the LMP92066 EVM GUI, run the setup.exe, a self-extracting archive that will install all the
necessary components of the user application – this includes the LabView run-time environment. The
setup.exe will also install Python 2.7, if it is not already present in the target system.
1.2 Kit Assembly
The EVM mates directly to the USB2Any via the 30-pin dual row header. Note that the EVM header spans
the 3 headers on the USB2Any controller board.
After the boards are plugged in together, install the USB cable between the USB2Any and the host PC.
Ensure that the 3-pin selectors J3 through J10 are in the factory default positions – see diagrams in
Figure 10 and Figure 11 for reference. The factory default set up establishes the device I2C slave address
that is expected by the GUI default settings. It also allows the kit to operate from the power supply offered
by the USB interface – no other power supplies are necessary at this point.
The figures below show the assembled kit for both enclosed and unenclosed versions of the USB2Any
controller. Note that the SUPPLY block is left open.
Figure 2.
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Figure 3.
1.3 Software Startup
The application program can be invoked through the START menu: look for LMP92066 EVM GUI in ‘All
Programs’ tab. Alternatively, the executable can be found in the installation directory – default is
C:/Program Files(86)/Texas Instruments/LMP92066 EVM GUI/LMP92066 EVM GUI.exe
GUI – LMP92066 Data Path Control
Upon start-up the application will search for the USB2Any/LMP92066EVM hardware and establish
communication. When successfully initialized, the screen below will be shown.
Figure 4. LMP92066 EVM GUI
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The panel on the left of the main window shows a list of control pages available to the user. Upon
selecting “Low Level Configuration” the following page will be shown.
Figure 5.
The “Low Level Configuration” page gives direct access to the internal registers of the LMP92066.
Selecting a line in the “Register Map” will bring up the “Register Data” set of controls, which lets the user
set and un-set the individual bit fields. The new values are set to the device by clicking “Write Register”
button. “Read Register” button will report the state of the selected LMP92066 register.
“Access Level” buttons send series of transfers that set the device’s memory Access Level. The default
access level is “L0”, and it gives only READ access to all internal registers.
Click “L2” prior to leaving this control page.
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Select “Data Path Control” from the panel on the left of the main window. The following page will be
shown:
Figure 6.
This page gives an overview of the current state of the LMP92066. “Read All” button downloads current
data from the device and updates the GUI screen. All controls with white background can be modified by
the user and sent immediately to the device (left-click on the control, enter new HEX value, and press
ENTER). Note that device must be in Access Level L2 to allow changes to the internal registers values on
this page. Currently enabled Access Level is indicated at the top of the page. The controls with gray
backgrounds are indicators only.
The 2 Radio Buttons “DRVEN0” and “DRVEN1” enable/disable the FETDRV0 and FETDRV1 outputs of
LMP92066.
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LUT Programming
Select “EEPROM Content” from the panel on the left of the main window. The following page will be
shown:
Figure 7.
The table in Figure 7 above shows the current content of the LUT in the operating memory of the device.
This also reflects the EEPROM content after the initial power up.
The factory default for the EEPROM content is:
• DELx (increments) = 0
• BASEx = 0x800 (midscale)
• X.POL = 0 (monotonically increasing function)
The content of the table can be edited by double clicking on table values and entering a new HEX number
(0 through F). In the example above all DELx entries were set to 0xF (maximum slope), and
DAC0_BASEM.POL was set for monotonically decreasing function implementation.
Click “Save File” button to save the new LUT configuration in the text file on the host PC. The file names
are the date stamps of when the file was created, and are stored in ‘C:/Program Data/Texas
Instruments/LMP92066 EVM GUI/Logs/EEPROM/’ directory
Click “Load LUT File”. A file selection window will appear, already preset to the above listed directory.
Select the file with the name corresponding to the time of save of interest. After selecting the file press
“OK”, which will both read in the file into the GUI and send the LUT data to the operating memory of
LMP92066.
At this point the new values of the LUT take effect in the signal path of LMP92066. Note that the
EEPROM has not been written with new values, yet (no Burn has been performed). The LUT values
can be validated/tested without committing them to EEPROM, through the use of the external text file.
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To Burn the EEPROM, that is, to copy the data from the operating memory to the non-volatile memory,
press “BURN EEPROM” button.
NOTE: At the time of writing this manual, Texas Instruments ensured the performance of the
EEPROM for up to 10 write cycles (Burns).
Time Log
Select “Running Plot/Data Log” from the panel on the left of the main window. Select the “Running Plot &
Data Log” tab if not already activated. The following page will be shown:
Figure 8.
The ‘START’ button begins the running plot (strip chart) of the Temperature sensor output and the
corresponding VDACx output values for the given LUT – as implemented in Section 1.4. The GUI reads the
internal TEMPM/TEMPL, DAC0M/DAC0L, and DAC1M/DAC1L registers and computes the equivalent
temperature (°C), and voltage at VDACx outputs (here the assumption is made that the internal DAC
reference is 5 V, and the DAC itself is ideal). The sampling interval can be set with the “Sampling Time”
control.
“STOP” terminates the logging. At that time a text log file is created in the ‘C:/Program Data/Texas
Instruments/LMP92066 EVM GUI/Logs/Datalog’ directory that contains the plot data.
At any time when the “Running Plot & Data Log” is executing, the user can select the “Data Path
Control” page to verify the state of the device – press “Read All” to refresh the display. For
example, the state of the OVRD_CNTL register (controls the OVERRIDE multiplexers in the signal
path), and DACx_BASEM.BYP (controls the multiplexer at the output of the LUT/ALU/Sum) will
affect the “Running Plot” output.
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