LP3954TLSLASHNOPB datasheet(32/58 Pages) TI2

32 / 58 page

BATTERY

VDD1

VDDA

LDO

Analog

supply

voltage

2.8V

LP3954

Digital

supply

voltage

VDD2

CIN

10 F

CVDD

100 nF

CVDDA

1 PF

4.7 H

LP3954

SNVS340D – JUNE 2005 – REVISED MARCH 2013

www.ti.com

Logic Interface Characteristics

(1.65V

≤ VDDIO ≤ VDD1,2V) (Unless otherwise noted)

Parameter

Test Conditions

Min

Typ

Max

Unit

LOGIC INPUTS SS, SI, SCK/SCL, SYNC/PWM, IF_SEL, EN_FLASH

VIL

Input Low Level

0.2 ×

VDDIO

VIH

Input High Level

0.8 ×

VDDIO

Logic Input Current

−1.0

1.0

µA

I2C Mode

400

kHz

SPI Mode,

MHz

fSCL

Clock Frequency

VDDIO > 1.8V

SPI Mode,

MHz

1.65V

≤ VDDIO < 1.8V

LOGIC OUTPUT SO

ISO = 3 mA

0.3

0.5

VDDIO > 1.8V

VOL

Output Low Level

ISO = 2 mA

0.3

0.5

1.65V

≤ VDDIO < 1.8V

ISO = −3 mA

VDDIO −

VDDIO > 1.8V

0.5

0.3

VOH

Output High Level

ISO = -2 mA

VDDIO −

1.65V

≤ VDDIO < 1.8V

0.5

0.3

Output Leakage Current

VSO = 2.8V

1.0

µA

LOGIC OUTPUT SDA

VOL

Output Low Level

ISDA = 3 mA

0.3

0.5

Control Interface

The LP3954 supports two different interface modes:

•

SPI interface (4 wire, serial)

•

I2C compatible interface (2 wire, serial)

User can define the serial interface by IF_SEL pin. IF_SEL=0 selects the I2C mode.

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LP3954TL/NOPB Datasheet(PDF) 32 Page - Texas Instruments

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