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LM3533 Graphical User Interface

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7.1 Main Control Tab

The Main Control tab (Figure 8) contains the pulldown menu's and buttons for configuring the LM3533's

global registers. The main tab is separated into different sections, where each section represents a

specific register within the LM3533. When any of the pulldown menus or buttons are selected the specific

data will get written to the LM3533. The exception is for the Control Bank Enable Buttons. These must first

be selected and then the Enable Selected Control Banks button must be pressed to write the data. A

button that is pushed indicates a 1 is written to the register. A button un-pushed indicates a 0. Table 1

through Table 10 show the break down of each register in the Main Control Tab.

Table 1. Output Configuration 1 (0x10)

Bit [7:6] Bits [5:4] Bits [3:2] Bit [1] Bit 0

LVLED3 LVLED2 LVLED1 HVLED2 HVLED1

00 = LVLED3 is 00 = LVLED2 is 00 = LVLED1 is controlled 0 = HVLED2 is 0 = HVLED1 is

controlled by Control controlled by Control by Control Bank C controlled by Control controlled by Control

Bank C Bank C (Default) Bank A Bank A (Default)

01 = LVLED3 is 01 = LVLED2 is 01 = LVLED1 is controlled 1 = HVLED2 is 1 = HVLED1 is

controlled by Control controlled by Control by Control Bank D controlled by Control controlled by Control

Bank D Bank D (Default) Bank B (Default) Bank B

10 = LVLED3 is 10 = LVLED2 is 10 = LVLED1 is controlled

controlled by Control controlled by Control by Control Bank E

Bank E (Default) Bank E

11 = LVLED3 is 11 = LVLED2 is 11 = LVLED1 is controlled

controlled by Control controlled by Control by Control Bank F

Bank F Bank F

Table 2. Output Configuration 2 (0x11)

Bits [3:2] Bits [1:0]

LVLED5 LVLED4

00 = LVLED5 is controlled by Control Bank C 00 = LVLED4 is controlled by Control Bank C

01 = LVLED5 is controlled by Control Bank D 01 = LVLED4 is controlled by Control Bank D

10 = LVLED5 is controlled by Control Bank E 10 = LVLED4 is controlled by Control Bank E

11 = LVLED5 is controlled by Control Bank F (Default) 11 = LVLED4 is controlled by Control Bank F (Default)

Table 3. Charge Pump Control (0x26)

Bits [2:1] Bit 0

Gain Select Charge Pump Disable

0X = Automatic gain select (Default) 0 = Charge pump enabled (Default)

10 = Gain set at 1x 1 = Charge pump disabled (high impedance from IN to CPOUT)

11 = Gain set at 2x

Table 4. Start-Up/Shutdown (0x12)

Bits [5:3] Bits [2:0]

Start-up Transition Time Shutdown Transition Time

000 = 2.048ms (Default) 000 = 2.048ms (Default)

001 = 262ms 001 = 262ms

010 = 524ms 010 = 524ms

011 = 1.049s 011 = 1.049s

100 = 2.097s 100 = 2.097s

101 = 4.194s 101 = 4.194s

110 = 8.389s 110 = 8.389s

111 = 16.78s 111 = 16.78s

Startup time is from when the device is enabled via I

C to when Shutdown ramp time is from when the device is shutdown via

the initial target current is reached. I

C until the current sink ramps to 0.

AN-2250 LM3533 Evaluation Kit SLOA172B–June 2012–Revised April 2013

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