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LP5526TL/NOPB Datasheet(PDF) 18 Page - Texas Instruments

Part # LP5526TL/NOPB
Description  Lighting Management Unit With High-Voltage Boost Converter With up to 150-mA Serial Flash LED Driver
PDF  41 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LP5526TL/NOPB Datasheet(HTML) 18 Page - Texas Instruments

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background image
EN_RGB
RGB_PWM
RGB max
current reg
XSW
RGB total current
0A
Max current
Pre-flash
Flash
Pre-flash current value
Max current value
EN_RGB
XSW
RGB_PWM
EN_EXT_X_PWM
EN_PWM_PIN
GPIO[0]/PWM
RGB total current
0A
Max current
Pre-flash
Flash
LP5526
SNVS431D – FEBRUARY 2006 – REVISED MARCH 2013
www.ti.com
Figure 18. Using External PWM Control for Flash
Controlling RGB Max Current Register Values
In this case pre-flash brightness is adjusted by adjusting the current values in the RGB max current register.
Note that in this mode flash control speed and timing depends on the I2C communication speed.
•
Enable RGB functions and disable PWM mode (EN_RGB = 1, RGB_PWM = 0)
•
Enable RGB constant current mode (CC_SW = 0)
•
Write pre-flash values for each output to RGB max current register (e.g. 00b for 25% of maximum current)
•
Start pre-flash by switching on the LEDs (RSW = 1, GSW = 1, BSW = 1). Pre-flash brightness can be
adjusted also by setting on only one or two LEDs during the pre-flash
•
Start flash by writing each output maximum current values to RGB max current register
•
Stop flash by switching off the LEDs (RSW = 0, GSW = 0, BSW = 0)
Figure 19. Controlling RGB Max Current Values to Introduce Flash
18
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Copyright © 2006–2013, Texas Instruments Incorporated
Product Folder Links: LP5526



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