LP3950SLSLASHNOPB datasheet(3/38 Pages) TI1

3 / 38 page

LP3950

www.ti.com

SNVS331C – NOVEMBER 2004 – REVISED APRIL 2013

PIN DESCRIPTIONS

Pin #

Name

Type

Description

Input

Boost converter feedback.

GND_BOOST

Ground

Power switch ground.

Output

Open drain, boost converter power switch.

VDD2

Power

Supply voltage for internal digital circuits.

GND2

Ground

Ground return for VDD2 (internal digital).

DME

Logic Input

Default mode enable (internal pull down 1 M

Ω).

AMODE

Logic Input

Audio mode selection (internal pull down 1 M

Ω).

VDDA

Power

Supply voltage for audio circuits.

ASE

Input

Analog audio input, single-ended.

AD1

Input

Analog audio input, differential.

AD2

Input

Analog audio input, differential.

GNDA

Ground

Ground for analog audio inputs.

Input

Oscillator resistor.

VDD1

Power

Supply voltage for internal analog circuits.

GND1

Ground

Ground.

VREF

Output

Internal reference bypass capacitor.

GND3

Ground

Ground.

NRST

Logic Input

Low active reset input.

SS/SDA

Logic I/O

SPI slave select/ I2C data line.

Logic Output

SPI serial data output.

Logic Input

SPI serial data input.

SCK/SCL

Logic Input

SPI/ I2C clock.

PWM_LED

Logic Input

Direct PWM control for LEDs.

VDDIO

Power

Supply voltage for logic IO signals.

IF_SEL

Logic Input

SPI/I2C select (IF_SEL = 1 in SPI mode).

Output

Open drain output, blue LED2.

Output

Open drain output, green LED2.

Output

Open drain output, red LED2.

GND_RGB

Ground

RGB driver ground.

Output

Open drain output, red LED1.

Output

Open drain output, green LED1.

Output

Open drain output, blue LED1.

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