Texas Instruments LP5868T Bedienungsanleitung

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LP5868T 8 × 18 LED High-Current Matrix Driver

with 8-Bit Analog and 8-Bit or 16-Bit PWM Dimming

1 Features

•LED matrix topology:

–18 constant current sinks with 8 scan switches

for 144 LED dots

–Configurable for 1 to 8 scan switches

•Operating voltage range:

–V

CC

/V

LED

range: 2.7V to 5.5V

–Logic pins compatible with 1.8V, 3.3V, and 5V

•18 constant current sinks with high precision:

–100mA per current sink when V

CC

≥ 3.3V

–Device-to-device error: ±5%

–Channel-to-channel error: ±5%

–Phase-shift for balanced transient power

•Ultra-low power consumption:

–Shutdown mode: I

CC

≤ 1μA when EN = Low

–Standby mode: I

CC

≤ 10μA when EN = High

and CHIP_EN = 0 (data retained)

–Active mode: I

CC

= 5mA (typ.) when channel

current = 12.5mA

•Flexible dimming options:

–Individual ON/OFF control for each LED dot

–Analog dimming (current gain control)

•Global 7-step Maximum Current (MC)

setting for all LED dots

•3 groups of 7-bit Color Current (CC) RGB

setting

•Individual 8-bit Dot Current (DC) setting for

each LED dot

–PWM dimming with audible-noise-free

frequency

•Global 8-bit PWM dimming for all LED dots

•3 programmable groups of 8-bit PWM

dimming for LED dot arbitrary mapping

•Individual 8-bit or 16-bit PWM dimming for

each LED dot

•Full addressable SRAM to minimize data traffic

•Individual LED dot open/short detection

•De-ghosting and low brightness compensation

•Interface options:

–1MHz (max.) I

2

C interface when IFS = Low

–12MHz (max.) SPI interface when IFS = High

2 Applications

•LED animation and indication for:

–Major and smart home appliances

–Global RGB keyboard backlighting

–Outdoor keypad backlighting

–IR module for video surveillance and IP camera

–Laser diode in optical module

3 Description

The LP5868T is a high-current and high-performance

LED matrix driver. The device integrates 18 constant

current sinks with N (N = 6/8/11) switching MOSFETs

to support . The LP5868T integrates 8 MOSFETs for

up to 144 LED dots or 48 RGB LEDs.

The LP5868T supports both analog dimming and

PWM dimming methods. For analog dimming, each

LED dot can be adjusted with 256 steps. For PWM

dimming, the integrated 8-bit or 16-bit configurable

PWM generators enable smooth and audible-noise-

free dimming control. Each LED dot can also be

arbitrarily mapped into 8-bit Group PWM to achieve

dimming control together.

The LP5868T device implements full addressable

SRAM to minimize the data traffic. The ghost-

cancellation circuitry is integrated to eliminate both

upside and downside ghosting. The LP5868T also

supports LED open and short detection functions.

Both 1MHz (maximum) I

2

C and 12MHz (maximum)

SPI are available in LP5868T.

Package Information

PART NUMBERPACKAGE

(1)

BODY SIZE (NOM)

LP5868TRKP (VQFN, 40)5.00mm × 5.00mm

(1)For all available packages, see the orderable addendum at

the end of the data sheet.

VIO_EN

SDA_MOSI

SCL_SCLK

SW0

SW1

CS17

MCU

VCC

GND

LP5868T

ADDR1_MISO

SW2

VCAP

CS2

CS0

VSYNC

CS1

VLED

SW7

ADDR2_SS

IFS

V

LED

V

CC

C

VLED

C

VCC

C

VIO

V

IO

R

Pullup

C

VCAP

Red LED

Green LED

Blue LED

Simplified Schematic

LP5868T

SNVSCE2B – MAY 2023 – REVISED NOVEMBER 2023

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

Produktspezifikationen