LP5861T中文資料德州儀器數(shù)據(jù)手冊PDF規(guī)格書

1 Features

? Operating voltage range:

– VCC/VLED range: 2.7 V to 5.5 V

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

? 18 high current and precision constant current

sinks:

– 125-mA per current sink when VCC ≥ 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: ICC ≤ 2 μA when EN = Low

– Standby mode: ICC ≤ 10 μA when EN = High

and CHIP_EN = 0 (data retained)

– Active mode: ICC = 5 mA (typical) when channel

current = 12.5 mA

? Flexible dimming options:

– Individual ON/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.) I2C interface when IFS = Low

– 12-MHz (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 LP5861T 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 N × 18 LED dots or N × 6 RGB LEDs. The

LP5861T is the direct driving version to support 18

LED dots or 6 RGB LEDs.

The LP5861T 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-noisefree

dimming control. Each LED dot can also be

arbitrarily mapped into 8-bit Group PWM to achieve

dimming control together.

The LP5861T device implements full addressable

SRAM to minimize the data traffic. The ghostcancellation

circuitry is integrated to eliminate both

upside and downside ghosting. The LP5861T also

supports LED open and short detection functions.

Both 1-MHz (maximum) I2C and 12-MHz (maximum)

SPI are available in LP5861T.