Texas Instruments LMP92066 Manuale utente

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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Quick Start

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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Quick Start

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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Quick Start

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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