LM3509SDEV National Semiconductor, LM3509SDEV Datasheet - Page 9

• Manufacturer Part Number: LM3509SDEV
• Description: BOARD EVALUATION FOR LM3509SD
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LM3509SDEV

• Current - Output / Channel: 40mA
• Outputs And Type: 2, Non-Isolated
• Voltage - Output: 21V
• Features: Dimmable, I²C Interface
• Voltage - Input: 2.7 ~ 5.5V
• Utilized Ic / Part: LM3509
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

LM3509 I
Program
In order to fully evaluate the LM3509 with the National Semi-
conductor USB Interface Board, National has created an I
compatible program (LM3509 .exe) . To begin with, plug the
LM3509 evaluation board iinto the USB docking board via the
USBL and USBR connectors and plug the National Semicon-
ductor USB Interface Board into a PC via a standard USB
cable. The USB docking board will provide all of the control
signals for the simple interface as well as power to the
LM3509 Evaluation Board.
A jumper on the LM3509 evaluation board labeled VIN/VUSB
allows the user to either connect an external power supply to
the IN header on the LM3509 evaluation board, or draw power
from the docking board. If the jumper is installed the USB
docking board supplies power to the LM3509 Evaluation
board. Removal of the jumper disconnects the 3.3V supply
from the USB Interface Board. Once removed, an external
supply is required at the IN header. For proper operation, the
USB docking board must be plugged into the PC before the
interface program is opened.
Once connected, and the program is executed, a basic inter-
face window will open. (see Figure 12). At the top of the
interface, the user can read or write to any of the data regis-
ters on the LM3509 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 ac-
cepts hex data while the read and write buttons directly below
the Address pull-down menu execute the Read or Write com-
mand. Just below the Write and Read buttons are 5 enable
2
C Compatible Interface
FIGURE 12. LM3509.exe
2
C
9
buttons. Two dedicated enable bits (ENM and ENS) will en-
able the two LED banks (MAIN and SUB). A dedicated bit
(UNI) enables the unity function 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 32 levels of brightness for the MAIN and SUB
banks. Just below the 2 brightness level slider bars are 6
convenient action buttons: 3 set buttons and 3 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.
ResetM resets the MAIN and SUB brightness levels to zero
and disables the MAIN and SUB banks.
To the right of the 2 brightness level slider bars are 2 pulldown
menus which control the ramp rate of the brightness levels
and the delay between turning on the LM3509's boost con-
verter and the enabling of the current sources. To the left of
the 2 brightness level slider bars are convenient controls for
the Hardware RESET /GPIO pin. NOTE: If the part is enabled
to any brightness level and the program is closed, the LM3509
will remain in the last programmed state.
30011116
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