Set-Up
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Figure 5. TPS61177A GUI - Register Control Page
The I2C-compatible device address is fixed at 0x58 (8-bit, 2Ch for 7-bit) in this program. The checkbox
“Enable I2C Pullup” is used to enable internal pullup (3.3 V) of USB2ANY when I2C pullup on
TPS61177AEVM is not available. I2C clock speed can be also selected from 1 0kHz to 400 kHz and
default speed is set to 100 kHz. EN signal from USB2ANY can be inserted by checking “Enable Pin”
checkbox. This is a useful control by GUI when Vin is not used as EN input by JP1(pin 1 and 2). J18
should be closed in this case. Register table on the right side can show the current values of the registers.
Press “Read All” button to read back all the registers and the values will be updated on this table. If any
register values need to changed, simply double click on the individual bit values to change it in this table
or press “Write Register” button to write all the registers at a time if “Deferred” is selected instead of
“Immediate” from dropdown box. “Brightness PWM” checkbox can be used to generate PWM input to the
device by USB2ANY and J17 should be closed for this control. Vin can be also used as PWM input(100%)
when JP9 (pins 1 and 2) is closed.
The minimum procedure for turning on the LEDs is as follows:
1. Connect the LED board (user-designed or WLEDEVM-260 from TI) to the TPS61177AEVM evaluation
board. Set jumpers for number of LEDs per string.
2. Connect external power and ground to the board.
•
Suggest 12 V to VIN jack.
•
Connect ground to GND jack.
3. Run “C:\Program Files (x86)\Texas Instruments\TPS61177A\nw.exe" or desktop icon
“TPS61177AEVM”.
16
List of Tables
SNVU490 – OCTOBER 2015
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