Texas Instruments LP5864 Bruksanvisning

Läs gratis den bruksanvisning för Texas Instruments LP5864 (49 sidor) i kategorin ej kategoriserat. Guiden har ansetts hjälpsam av 2 personer och har ett genomsnittsbetyg på 5.0 stjärnor baserat på 8 recensioner. Har du en fråga om Texas Instruments LP5864 eller vill du ställa frågor till andra användare av produkten? Ställ en fråga

LP5864 4 × 18 LED Matrix Driver With 8-Bit Analog and 8-/16-Bit PWM Dimming

1 Features

•LED matrix topology:

–18 constant current sinks with 4 scan switches

for 72 LED dots

–Configurable for 1 to 4 scan switches

•Operating voltage range:

–V

CC

/V

LED

range: 2.7 V to 5.5 V

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

•18 constant current sinks with high precision:

–0.1 mA–50 mA per current sink when V

CC

≥ 3.3

V

–Device-to-device error: ±5%

–Channel-to-channel error: ±5%

–Phase-shift for balanced transient power

•Ultra-low power consumption:

–Shutdown mode: I

CC

≤ 2 uA when EN = Low

–Standby mode: I

CC

≤ 10 uA when EN = High

and CHIP_EN = 0 (data retained)

–Active mode: I

CC

= 3 mA (typ.) when channel

current = 5 mA

•Flexible dimming options:

–Individual ON and OFF control for each LED

dot

–Analog dimming (current gain control)

•Global 3-bit Maximum Current (MC) setting

for all LED dots

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

for red, green, and blue

•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 and short detection

•Deghosting and low brightness compensation

•Interface options:

–1-MHz (max.) I

2

C interface when IFS = Low

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

2 Applications

•LED animation and indication for:

–Keyboard, mouse, and gaming accessories

–Major and smart home appliances

–Smart speaker, wired and wireless speaker

–Audio mixer, DJ equipment, and broadcast

–Access equipment, switches, and servers

•Constant current sinks for optical module

3 Description

Electronic devices are becoming smarter, requiring

to use larger quantity of LEDs for animation and

indication purposes and high performance LED matrix

driver is required to improve user experience with

small solution size.

The LP586x devices are a family of high performance

LED matrix drivers. The device integrates 18 constant

current sinks with N (N = 1/2/4/6/8/11) switching

MOSFETs to support N × 18 LED dots or N × 6 RGB

LEDs. The LP5864 integrates 4 MOSFETs for up to

72 LED dots or 24 RGB LEDs.

The LP5864 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 LP5864 device implements full addressable

SRAM to minimize the data traffic. The ghost-

cancellation circuitry is integrated to eliminate both

upside and downside ghosting. The LP5864 also

supports LED open and short detection functions.

Both 1-MHz (maximum) I

2

C and 12-MHz (maximum)

SPI are available in LP5864.

Device Information

PART NUMBERPACKAGE

(1)

BODY SIZE (NOM)

LP5864VQFN (32)4 mm × 4 mm

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

the end of the data sheet.

VIO_EN

SDA_MOSI

SCL_SCLK

SW0

CS17

MCU

VCC

GND

LP5864

ADDR1_MISO

VCAP

CS2

CS0

VSYNC

CS1

VLED

ADDR2_SS

IFS

V

LED

: 2.7 V to 5.5 V

V

CC

: 2.7 V to 5.5 V

C

VLED

C

VCC

C

VIO

V

IO

: 1.8 V to 5 V

R

Pullup

C

VCAP

AGND

4.7 k



1



F

1



F

1 nF

1



F

Op



onal

SW1

Red LED

Green LED

Blue LED

SW2

SW3

Simplified Schematic

LP5864

SNVSC52 – DECEMBER 2021

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.

Produktspecifikationer