Jumpers Connections
Press keys SW2 and SW3 simultaneously
Start GUI software on computer
3.
Variable Gain mode
Connect pins 2 and 3 of jumper J6.
Connect pins 1 and 2 of jumper J7.
Attach a signal generator to the EXT_IN connector (SMA or SMB connector may need to be
populated).
Press keys SW2 and SW3 simultaneously
Start GUI software on computer
Connect the LaunchPad and TPL0501EVM to a computer through the USB connector
4
Jumpers Connections
1.
J1
&
J2
–
LaunchPad Headers
These connectors mate with the male headers on the LaunchPad
2.
J3
–
External LED Power
This connector is where the external +5V supply is attached to power the two RGB LEDs.
3.
J4
–
TCA7408 GPIO
This is a pin out of the four unused GPIO pins from the TCA7408, GPIO4-GPIO7.
4.
J5
–
Feedback loop
For the TPL0401A to function as a voltage reference circuit the negative feedback loop must be
shorted, placing a jumper across this header will short the inverting input to the output.
5.
J6
–
LED or Op-amp
This header controls what the TPL0401B is attached to. When shorted across position 1 and 2 the
TPL0401B is connected in series with the external resistor to control the current through the LED
driver. When shorted across position 2 and 3 the TPL0401B is connected to the inverting input of the
op-amp to change the gain of the circuit.
6.
J7
–
Op-amp input
This header controls the input to the non-inverting pin of the LMV321. When shorted across position 1
and 2, the TPL0401A in a voltage divider mode is attached to the non-inverting input of the LVM321.
This setup is used to test the voltage reference setup. When shorted across pins 2 and 3, the SMA
connector is attached to the non-inverting input.
7.
J9
–
Test Points
This connector offers test points for the serial data lines, SDA, SCL and the DIN that drives the
TCA5405
Table 1. Description of Connectors and Jumpers
Label
J1, J2
J3
J4
J5
J6
J7
J8
J9
Description
Connectors to interface with LaunchPad
External 5V for LED
GPIO4-GPIO7 from TCA7408
Control jumper to short feedback loop
Jumper to control LED or Op-Amp
Jumper to control input to Op-Amp
SMA/B Footprint for external input
Test points for DIN, SDA and SCL
5
Software Setup
The EVM does not require any software set up to operate in the LED mode. The keys SW1-SW4 control
the blinking rate of the LEDs and the color mixing of the LEDs, without any additional software setup.
To operate the EVM in any other mode, GUI software is required. The GUI software is available in a zip
SLIU008
–
September 2011
TPL0401EVM
Copyright
©
2011, Texas Instruments Incorporated
3
TI [ TEXAS INSTRUMENTS ]
