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LP3954TL/NOPB Datasheet(PDF) 31 Page - Texas Instruments

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No. de pieza LP3954TL/NOPB
Descripción Electrónicos  Advanced Lighting Management Unit
PDF  60 Pages
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

LP3954TL/NOPB Datasheet(HTML) 31 Page - Texas Instruments

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SW
BATTERY
VDD1
VDDA
LDO
Analog
supply
voltage
2.8V
LP3954
Digital
supply
voltage
LDO
2.8V
VDD2
CIN
10 PF
CVDD
100 nF
CVDDA
1 PF
4.7 PH
0
0.2
0.4
0.6
0.8
1
00
20
40
60
80
A0
C0
E0
FF
INPUT VOLTAGE × VDDA
TEMPERATURE (°C)
-40
-20
0
20
40
60
80
100 120
100
10
1
0.1
0.01
LP3954
www.ti.com
SNVS340D – JUNE 2005 – REVISED MARCH 2013
Figure 33. ADC Code vs Input Voltage in
Figure 34. Example Curve for Thermistor
Temperature Measurement Mode
EXAMPLE TEMP SENSOR READING AT DIFFERENT TEMPERATURES (R(25°C)=1M
Ω)
T°C
R(M
Ω)
Rt(M
Ω)
V(ASE)
-40
1
60
2.7540984
0
1
4
2.24
25
1
1
1.4
60
1
0.2
0.4666667
100
1
0.04
0.1076923
7V Shielding
To shield LP3954 from high input voltages 6…7.2V the use of external 2.8V LDO is required. This 2.8V voltage
protects internally the device against high voltage condition. The recommended connection is as shown in the
picture below. Internally both logic and analog circuitry works at 2.8V supply voltage. Both supply voltage pins
should have separate filtering capacitors.
In cases where high voltage is not an issue the connection is as shown below.
Copyright © 2005–2013, Texas Instruments Incorporated
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Product Folder Links: LP3954



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