LP3954TLSLASHNOPB datasheet(31/60 Pages) TI1

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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

0.2

0.4

0.6

0.8

INPUT VOLTAGE × VDDA

TEMPERATURE (°C)

-40

-20

100 120

100

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

2.7540984

2.24

1.4

0.2

0.4666667

100

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.

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