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LP3954TL/NOPB Datasheet(PDF) 30 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) 30 Page - Texas Instruments

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VDDA
TEMPERATURE
SENSOR
AIN
S1
S2
R
ADC
-
+
VDDA
FF
00
INPUT CURRENT (PA)
0
7
E0
C0
A0
80
60
40
20
1
2
3
4
5
6
LP3954
SNVS340D – JUNE 2005 – REVISED MARCH 2013
www.ti.com
Figure 31. ADC Code vs Input Current in Light Measurement Mode
TEMPERATURE MEASUREMENT
The temperature measurement requires two external components: resistor and thermistor (resistor that has
known temperature vs resistance curve). The ADC reads the voltage level at ASE pin and converts the result in
digital word. User can read the ADC output from register. The known temperature allows for example to monitor
the temperature inside the display module and decrease the current level of the LEDs if temperature raises too
high. This function may increase lifetime of LEDs in some applications.
Figure 32. Temperature Sensor Connection Example
30
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Copyright © 2005–2013, Texas Instruments Incorporated
Product Folder Links: LP3954



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