User guide
TMD3782 EVM
TMD3782 Light-To-Digital Color Ambient
Light / Proximity Sensor Evaluation Kit
Content
1
2
2.1
2.1.1
2.1.2
2.1.3
2.1.4
2.1.5
2.1.6
Establishing basic functionality ............................................................................................ 4
TMD3782 EVM graphical user interface (GUI) .................................................................... 6
Software overview ................................................................................................................ 6
Input side, “Functional” tab .................................................................................................. 8
Input side, “Register” tab .................................................................................................... 10
Output side, “Functional” tab .............................................................................................. 16
Output side, “PROXHISTO” tab ......................................................................................... 17
Output side, “PLOT” tab ..................................................................................................... 17
Output Side “Plot” Tab ....................................................................................................... 18
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TMD3782 Color Light-To-Digital Converter with Proximity Sensing
The TMD3782 device will perform color temperature measurement, ambient light sensing (ALS) and
proximity detection with background light rejection. The device detects light intensity under a variety
of lighting conditions and through a variety of attenuation materials, including dark glass.
The proximity detection feature allows a large dynamic range of operation for accurate distance
detection, such as in a cell phone when the user positions the phone close to their ear. IR LED sink
current is factory trimmed to provide consistent proximity response without requiring customer
calibrations. An internal state machine provides the ability to put the device into a low power
state between proximity and RGBC measurements providing very low average power consumption.
The color sensing feature is useful in applications such as backlight control, solid state lighting,
reflected LED color sampler, or fluorescent light color temperature detection. The integrated IR
blocking filter makes this device an excellent ambient light sensor, color temperature monitor, and
general purpose color sensor.
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 v2.1, the TMD3782 evaluation daughterboard and a
USB interface cable and a USB Flash Drive. When the USB cable is connected the green LED
should flash indicating that power is being received via the USB interface, and the motherboard
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.
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Note:
After the “DigitalLightSensor” application program begins executing, it will turn this LED off
so that it does not interfere with testing.
1
Establishing basic functionality
The software should be started using the desktop icon or by double clicking the
DigitalLightSensor.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\TMD3782EVM Windows 32 bit operating systems
C:\Program Files (x86)\ams\TMD3782EVM Windows 64 bit operating systems
A different install path may be selected by the user. When started, two windows will open on the
PC. The top window, or Parent Window (PW), is not typically needed and may be placed out of the
way. The bottom window, or Child Window (CW), is the main user interface and should be
positioned on the screen for easy access. Clicking on the red “X” on the PW will close both windows
and terminate the application. Clicking on the red “X” on the CW will close only the CW.
The “Functional” tabs on both the left and right side of the main display (bottom window) will be
selected by default. On the right side, numbers should be changing, showing that the ALS and
proximity functions are operational. By changing the ambient light source or waving your hand over
the sensor at <4 inch (100mm) separation you should see the ALS and proximity readings change
respective to the light intensity reaching the sensor.
page 4/19
The balance of this document identifies and describes the controls available on the different tabs of
the GUI. In combination with the TMD3782 datasheet, the QSG and application notes available on
the ams website,
www.
ams
.com,
there should be enough information to allow evaluation of the
TMD3782 device.
page 5/19
PCB设计
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