LP3958 datasheet(3/28 Pages) NSC

3 / 28 page

Connection Diagrams and Package Mark Information (Continued)

PIN DESCRIPTIONS

Pin #

Name

Type

Description

Output

Boost Converter Power Switch

Input

Boost Converter Feedback

KEY1

Output

Keypad LED Output 1 (Current Sink)

KEY2

Output

Keypad LED Output 2 (Current Sink)

KEY3

Output

Keypad LED Output 3 (Current Sink)

GND_SW

Ground

Power Switch Ground

NRST

Input

External Reset, Active Low

SCL

Logic Input

Clock Input for I

2C Compatible Interface

IKEY

Input

External Keypad LED Maximum Current Set Resistor

GND_KEY

Ground

Ground for KEY LED Currents

VDD2

Power

Supply Voltage 3.0...5.5 V

VDDIO

Power

Supply Voltage for Digital Input/Output Buffers and Drivers

SDA

Logic Input/Output

Data Input/Output for I

2C Compatible Interface

GPIO[2]

Logic Input/Output

General Purpose Logic Input/Output

GPIO[0] / PWM

Logic Input/Output

General Purpose Logic Input/Output / External PWM Input

GND_WLED

Ground

Ground for White LED Currents (MAIN and SUB Outputs)

GNDT

Ground

VDD1

Power

Supply Voltage 3.0...5.5 V

VREF

Output

Reference Voltage (1.23V)

GPIO[1]

Logic Input/Output

General Purpose Logic Input/Output

MAIN

Output

MAIN Display White LED Current Output (Current Sink)

SUB

Output

SUB Display White LED Current Output (Current Sink)

VDDA

Output

Internal LDO Output (2.80V)

GND

Ground

Ground for Core Circuitry

IRT

Input

Oscillator Frequency Set Resistor

LP3958 Datasheet(PDF) 3 Page - National Semiconductor (TI)

LP3958 Datasheet(HTML) 3 Page - National Semiconductor (TI)

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