Texas Instruments LP5812 Handleiding

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LP5812 4 × 3 Matrix RGB LED Driver with Autonomous Control

1 Features

•Operating voltage range:

–V

CC

range: 2.7V to 5.5V

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

•Time-cross-multiplexing (TCM) topology:

–Drives up to 12 LEDs or 4 RGB LEDs

–¼, ⅓, ½, 1 multiplexing ratio

–Supports direct, TCM, and mix-drive modes

•4 constant current sinks with high precision:

–0.1mA to 51mA per current sink

–Device-to-device error: max ±5%

–Channel-to-channel error: max ±5%

–Ultra-low headroom voltage: 110mV (typ.) at

25.5mA; 210mV (typ.) at 51mA

–PWM phase shift configurable for each LED

•Ultra-low power consumption:

–Standby: I

STB

= 26μA (typical) when CHIP_EN

= 0 (data retained)

–Active: I

NOR

= 0.4mA (typical) when LED

current = 25.5mA

•Analog dimming (current gain control)

–Global 1-bit Maximum Current (MC): 25.5mA or

51mA

–Individual 8-bit Dot Current (DC) setting

•PWM dimming up to audible-noise-free 24kHz

–Individual 8-bit PWM dimming resolution

–Linear or exponential dimming curves

•Autonomous animation engine control

•Individual LED dot open/short detection

•Integrated de-ghosting function

•1MHz (max.) I

2

C interface

•–40°C to 85°C operating temperature range

2 Applications

LED animation and indication for:

•Portable and wearable electronics - earbud and

charging case, E-cigarette, smart watch

•Gaming and home entertainment - smart speaker,

RGB mouse, VR headset, and controller

•Internet-of-Things (IOT) - E-tag, video doorbell

•Networkings - router, access point

•Industrial HMI - EV charger, factory automation

3 Description

The LP5812 is a 4 × 3 matrix RGB LED driver with

autonomous animation engine control. The device has

ultra-low normal operation current with 0.4mA (typical)

when illuminate LEDs.

The time-cross-multiplexing (TCM) structure is

adopted, which uses 4 output pins to control 12 LED

dots individually. Both high-side scan switch and low-

side current sink are contained in one output. The

total solution size are minimized for space limited

system.

The autonomous animation engine can significantly

reduce the real-time loading of controller. Each LED

can be configured through the related registers to

realize vivid and fancy lighting effects. The device

can generate 6MHz clock signal and use it for

synchronizing the lighting effects among multiple

devices.

Package Information

PART NUMBERPACKAGE

(1)

BODY SIZE (NOM)

LP5812

DSBGA (9)1.43mm × 1.34mm

WSON (8)3mm × 3mm

(1)Product Preview

2.7 V - 5.5 V

LP5812

OUT0

OUT1

OUT2

OUT3

1 uF

GND

VCC

SCL

SDA

SYNC

MCU

V

MCU

D0

D1

D2

D3

Red LED

Green LED

Blue LED

4.7kΩ 4.7kΩ

Simplified Schematic

LP5812

SNVSCC9C – NOVEMBER 2023 – REVISED FEBRUARY 2025

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.

Product specificaties