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LP3954TL/NOPB Datasheet(PDF) 26 Page - Texas Instruments

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Part # LP3954TL/NOPB
Description  Advanced Lighting Management Unit
PDF  60 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LP3954TL/NOPB Datasheet(HTML) 26 Page - Texas Instruments

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VIEW FINDER / FOCUS
HIGH CURRENT
FLASH
FL_T[1:0]
FLASH_EN input
HC[1:0]
Current
Time
HC[11] = IMAX
EN_HCFLASH bit
HC[1:0] = 00
HC[1:0] = 01
HC[1:0] = 10
HC[1:0] = 11
For mode
FL_T[1:0]=11
LP3954
SNVS340D – JUNE 2005 – REVISED MARCH 2013
www.ti.com
Figure 24 shows the functionality of the built-in flash.
Figure 24. Built-In Flash
HIGH CURRENT DRIVER ELECTRICAL CHARACTERISTICS
Parameter
Test Conditions
Min
Typ
Max
Unit
ILEAKAGE
FLASH pin leakage current
0.1
2
µA
IMAX(FLASH)
Maximum Sink Current
400
mA
Accuracy at 300 mA
RFLASH=1.18 kΩ ±1%
±5
±10
%
Current mirror ratio
1:300
Backlight Drivers
LP3954 has 2 independent backlight drivers. Both drivers are regulated constant current sinks. LED current for
both LED banks (WLED1…4 and WLED5…6) are controlled by 8-bit current mode DACs with 0.1 mA step.
WLED1…4 and WLED5…6 can be also controlled with one DAC for better matching allowing the use of larger
displays having up to 6 white LEDs in parallel.
Display configuration is controlled with DISPL bit as shown below.
DISPL
Configuration
Matching
Main display up to 4 LEDs
Good btw WLED1…4
0
Sub display up to 2 LEDs
Good btw WLED5…6
1
Large display up to 6 LEDs
Good btw WLED 1…6
Display backlight enables
1
WLED1-4 enabled
EN_W1-4
0
WLED1-4 disabled
EN_W5-6
1
WLED5-6 enabled
0
WLED5-6 disabled
26
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Copyright © 2005–2013, Texas Instruments Incorporated
Product Folder Links: LP3954



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