AMS TMD2620 Manual de usuario

User guide

TMD2620 EVM

TMD2620 Proximity Sensor Evaluation Module

Version 1.0

page 2/13

Contents

Establishing basic functionality ............................................................................................ 5

TMD2620 EVM graphical user interface (GUI).................................................................... 5

2.1

Software overview................................................................................................................ 5

2.1.1

Device ID Information........................................................................................................... 6

2.1.2

Log Status and Control Information ..................................................................................... 7

2.1.3

System Menus ..................................................................................................................... 7

2.1.4

System Level Controls......................................................................................................... 9

2.1.5

“Prox” Tab..........................................................................................................................10

Resources..........................................................................................................................13

page 3/13

TMD2620

The TMD2620 device features advanced proximity measurement. The slim module incorporates an

IR LED and factory calibrated LED driver.

Initial hardware setup

The software should be installed prior to connecting any hardware to the computer. Follow the

instructions found in the Quick Start Guide (QSG). This will load the required driver for the USB

interface and also the control software and graphical user interface (GUI).

The hardware consists of the EVM Controller v2.2a, the TMD2620 EVM daughterboard and a USB

interface cable.

page 4/13

When the USB cable is connected, the green LED should flash indicating that power is being

received via the USB interface, and the controller board processor is running. If the green LED does

not flash, check the USB cable connections; unplug the USB cable and try again. If the green LED

still does not flash, check the PC for USB error messages. See the Resources section at the end of

this document for additional assistance.

page 5/13

1 Establishing basic functionality

The software should be started selecting ams->TMD2620 EVM->TMD2620 EVM command in the

Windows menu or by double clicking the AOS_EVM.exe file from the installation directory. The

default installation directory, depending on the device and the operating system you are using, is:

C:\Program Files\ams\TMD2620_EVM Windows 32 bit operating systems

C:\Program Files (x86)\ams\TMD2620_EVM Windows 64 bit operating systems

A different install path may be selected by the user. When started, the TMD2620 window will open

on the PC.

The balance of this document identifies and describes the controls available on the GUI. In

combination with the TMD2620 datasheet, the QSG and application notes available on the ams

website, www.ams.com. There should be enough information to allow evaluation of the TMD2620

device.

2 TMD2620 EVM graphical user interface (GUI)

2.1 Software overview

On successful initialization, the software displays a main window, containing controls pertinent to

the connected device. If the software detects an error, it will display an error window.

If “Device not found or is unsupported” appears, verify that the correct daughterboard is properly

connected to the motherboard. If “Cannot connect to EVM board” appears, verify the USB cable is

connected. A green LED on the EVM Controller will flash to indicate that the USB cable is

connected and providing power to the system.

If the EVM board is disconnected from the USB bus while the program is running it will display an

error message and then terminate. Reconnect the EVM board and restart the program.

page 6/13

The main window for the TMD2620 is shown below.

Clicking on the red “X” will close the window and terminate the application.

The checkboxes near the top of the window power on the chip and enable the Prox function. The

Prox tab contains controls for the remaining functions and displays status and data from the device

as it operates.

2.1.1 Device ID Information

The lower left corner of the window displays the ID number of the EVM motherboard, identifies the

device being used and displays the ID of the device.

page 7/13

2.1.2 Log Status and Control Information

The lower right corner of the window contains status information and controls for the logging

function:

This section contains two text boxes that are stored in the log file data and used to build the file

name for the log file. If you change the data in these fields, the new values will be stored with all

new log data. The default log file name will be based on these values at the time the log file is

written. If nothing is entered in these boxes they default to a period (“.”).

Sample default file name:

TMD2620_1-2-3_Log_HH_MM_SS.csv

From AOS_EVM.exe

From User Input

The Count value displayed is a count of the number of samples currently in the log buffer.

The Elapsed Time value indicates the elapsed time since data logging was started.

The final field in this section controls the number of log samples that will be collected before logging

is automatically stopped and the log data is stored. If the count of log entries reaches the amount

shown in this field, the program will stop the logging function and pop up a window asking for a file

name to save the collected data. After saving the collected data the log is cleared and the count is

set back to 0.

2.1.3 System Menus

At the top of the window there are three pull-down menus labeled “File”, “Log”, and “Help”. The File

menu provides basic application-level control. The Log menu is used to control the logging function,

and the Help menu provides version and copyright information for the application.

2.1.3.1 File Menu

The File menu contains the following functions:

page 8/13

The Reread Registers function forces the program to re-read all of the control registers from the

device and display them on the screen. This does not read the status or PROX result registers,

because those registers are continually read while the program is running.

Click on the Exit command to close the main window and terminate the application. Any unsaved

log data will be cleared.

2.1.3.2 Log Menu

The Log menu is used to control the logging function and to save the log data to a file. Log data is

accumulated in memory until it is discarded or written to a data file.

Click Start Logging to start the logging function. Each time the program polls the Prox information

from the device, it will create a new log entry showing the raw data values, the values of various

control registers, and the values entered by the user into the text fields near the bottom right corner

of the window.

Click Stop Logging to stop the logging function. Once logging is stopped, the data can be written to

a file, or you can continue collecting additional data by clicking Start Logging again.

The Log a Single Entry command will cause logging to start, collect one single entry, and

immediately stop again. This function is not available when logging is already running.

Click Clear Log to discard any data that has already been collected. If there is data in memory,

which has not been saved to disk, this function will display a prompt asking you to verify that it is OK

to discard the data. If the log is running when this function is clicked, the log will continue running

after the existing data is discarded.

Click Save Log to save the collected log data to a data file. This will stop the logging function, if it is

active, and display a file dialog box for you to specify where to store the logged data. The default

file name, as described above, will be displayed, but you may change the file name if you wish.

page 9/13

2.1.3.3 Help Menu

The Help menu contains a single function; About.

The About function displays a dialog box showing the version and copyright information for the

AOS_EVM program and library.

Click the OK button to close this window and continue.

2.1.4 System Level Controls

Immediately below the top menu bar there are two checkboxes that are used to control the system

level functions of the TMD2620 device.

The Power-On checkbox controls the PON function of the TMD2620. When this box is checked, the

power is on and the device can operate. When this box is unchecked, the power is off and the

device will not operate (The control registers can still be written, but the device will not function).

The Prox Enable checkbox controls the PEN function of the TMD2620. Proximity detection is

enabled when this box is checked or disabled when unchecked.

page 10/13

2.1.5 “Prox” Tab

The main portion of the screen contains a tab labeled Prox. The controls in this tab are divided into

3 sections, each performing a separate function.

2.1.5.1 Prox Controls

The left side of the Prox tab contains controls to set various Prox settings.

The PPULSE controls the maximum number of pulses used for each prox cycle. To avoid saturating

the prox sensor, the Automatic Pulse Control (APC) feature of the device may reduce the number of

pulses in real-time. The maximum number of pulses selected, which is one more than the value in

the register (PPULSE = 0 →1 pulse), is displayed immediately to the right of the box.

The PPULSE_LEN control sets the width of all IR LED pulses within the proximity cycle. Longer

pulses result in increased proximity range and typically result in less electrical noise generated in

the analog front end.

The PGAIN control is a pulldown menu that lets you select the analog gain of the proximity IR

sensor. The values that can be chosen are 1x, 2x, 4x and 8x.

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