Texas Instruments LM3528TM Evaluation Board LM3528TMEV LM3528TMEV Datenbogen
Produktcode
LM3528TMEV
LM3528–USB Interface Board and I
2
C Compatible Interface Program
TI has created an I
2
C-compatible program (see
) and a USB interface board that can help
exercise the part in a simple way. The USB interface board provides all of the control signals for the
simple interface and can provide power to the part as well. A jumper on the LM3528 evaluation board
labeled V/VUSB allows you to connect either an external power supply to the V
simple interface and can provide power to the part as well. A jumper on the LM3528 evaluation board
labeled V/VUSB allows you to connect either an external power supply to the V
IN
header on the LM3528
evaluation board, or draw power from the USB board. Removal of the jumper disables the connection of
the USB power supply. Once removed, an external supply is required. If the jumper is installed, the USB
board supplies power to the LM3528 evaluation board. No adjustments to the USB board are needed. A
standard USB cable must be connected to the board from a PC in order to communicate with the LM3528
Evaluation Kit.
the USB power supply. Once removed, an external supply is required. If the jumper is installed, the USB
board supplies power to the LM3528 evaluation board. No adjustments to the USB board are needed. A
standard USB cable must be connected to the board from a PC in order to communicate with the LM3528
Evaluation Kit.
For proper operation, the USB interface board must be plugged into the PC before the LM3528.exe
interface program is opened. Once connected, and the program is executed, a basic interface window will
open. At the top of the interface, you can read or write to any of the data registers on the LM3528 using
the two pull down menus for the slave I.D. and the desired data address. The data field to the right of the
address pull-down menu accepts hex data while the read and write buttons directly below the Address
pull-down menu execute the Read or Write command.
interface program is opened. Once connected, and the program is executed, a basic interface window will
open. At the top of the interface, you can read or write to any of the data registers on the LM3528 using
the two pull down menus for the slave I.D. and the desired data address. The data field to the right of the
address pull-down menu accepts hex data while the read and write buttons directly below the Address
pull-down menu execute the Read or Write command.
Just below the Read and Write buttons are five enable buttons. Two dedicated enable bits (ENM and
ENS) enable the two LED strings (MAIN and SUB). A dedicated bit (UNI) enables the Unison Mode of the
two LED banks, and another bit (OLED) puts the part in OLED mode. The Enable All button
simultaneously enables both ENS and ENM.
ENS) enable the two LED strings (MAIN and SUB). A dedicated bit (UNI) enables the Unison Mode of the
two LED banks, and another bit (OLED) puts the part in OLED mode. The Enable All button
simultaneously enables both ENS and ENM.
Below the Enable buttons are two sliding bars and data fields that allow all 128 levels of brightness for the
MAIN and SUB banks. Just below the two brightness level slider bars are six convenient action buttons:
three set buttons and three reset buttons.
MAIN and SUB banks. Just below the two brightness level slider bars are six convenient action buttons:
three set buttons and three reset buttons.
SetM sets the MAIN brightness level to full-scale and enables the MAIN bank.
ResetM resets the MAIN brightness level to zero and disables the MAIN bank.
SetS sets the SUB brightness level to full-scale and enables the SUB bank.
ResetS resets the SUB brightness level to zero and disables the SUB bank.
Set sets the MAIN and the SUB brightness levels to full scale and enables the MAIN and SUB banks.
Reset resets the MAIN and SUB brightness levels to zero and disables the MAIN and SUB banks.
To the right of the two brightness level slider bars is a pull-down menu that controls the ramp rate of the
brightness level. To the left of the two brightness level slider bars are convenient controls for the GPIO1
pin and the HWEN/PGEN/GPIO pin.
brightness level. To the left of the two brightness level slider bars are convenient controls for the GPIO1
pin and the HWEN/PGEN/GPIO pin.
The HWEN/PGEN/GPIO pin has three functions: an active high hardware enable (HWEN), a pattern
generator output (PGEN), and a general purpose I/O (GPIO). At the bottom of the user interface are
button controls for creating the output pattern when HWEN/PGEN/GPIO is in PGEN mode. For a detailed
explanation of the pattern generator, see the LM3528 High Efficiency, Multi Display LED Driver With 128
Exponential Dimming Steps and Integrated OLED Power Supply in a 1.2mm × 1.6mm DSBGA Package
Data Sheet (
generator output (PGEN), and a general purpose I/O (GPIO). At the bottom of the user interface are
button controls for creating the output pattern when HWEN/PGEN/GPIO is in PGEN mode. For a detailed
explanation of the pattern generator, see the LM3528 High Efficiency, Multi Display LED Driver With 128
Exponential Dimming Steps and Integrated OLED Power Supply in a 1.2mm × 1.6mm DSBGA Package
Data Sheet (
). The output pattern is determined by the concatenation of four 8-bit data registers:
x90, x91, x92 and x93. Each bit for each of these data registers can be set in the user interface (Byte 0 –
Byte 3). The hex value of the data register is displayed to the right of the data bits in a data field. To the
right of the register data fields are convenient buttons to set all the bits to 1’s or reset all the bits to 0’s.
Byte 3). The hex value of the data register is displayed to the right of the data bits in a data field. To the
right of the register data fields are convenient buttons to set all the bits to 1’s or reset all the bits to 0’s.
Once you have selected the desired pattern, load the pattern into the LM3528 by clicking the “Load”
button. Once the output pattern has been loaded, select the bit period and duty cycle of the pattern using
the pull-down menus. Finally, the output pattern is executed by clicking the “Run” button.
button. Once the output pattern has been loaded, select the bit period and duty cycle of the pattern using
the pull-down menus. Finally, the output pattern is executed by clicking the “Run” button.
NOTE:
If the part is enabled to any brightness level and the program is closed, the LM3528 part will
remain in the last programmed state.
7
SNVA336A – August 2008 – Revised April 2013
AN-1823 LM3528 Evaluation Board
Copyright © 2008–2013, Texas Instruments Incorporated