TLC5944

具有 6 位点校正功能和预充电 FET 的 16 通道 12 位 PWM LED 驱动器

The is a 16-channel, constant current sink driver. Each channel is individually adjustable with 4096 pulse-width modulated PWM steps and 64 constant sink current dot correction steps. The dot correction DC adjusts for brightness variations between LEDs. Both grayscale GS control and DC are accessible via a common serial interface port. The maximum current value of all 16 channels can be set by a single external resistor.

The TLC5944 has an internal pre-charge FET to prevent the ghost-lighting phenomenon that occurs on multiplexed LED systems. The TLC5944 has three error detection circuits for LED open detection LOD, a thermal error flag TEF, and a pre-thermal warning PTW. The LOD detects a broken or disconnected LED, and a shorted LED to GND during the display period. The TEF indicates a too-high temperature condition; when the TEF is set, all output drivers are turned off by the thermal shutdown TSD protection. Additionally, when the TEF is cleared, all output drivers are restarted. The PTW indicates that the IC is operating in a high temperature condition. The output drivers remain on when PTW is set.

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16 Channels, Constant Current Sink Output

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60-mA Capability Constant Current Sink

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12-Bit 4096 Steps Grayscale Control with PWM

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6-Bit 64 Steps Dot Correction with Sink Current

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Internal Pre-Charge FET to Prevent LED Ghosting Phenomenon on Multiplexed LED Systems

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LED Power-Supply Voltage up to 15 V

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VCC = 3.0 V to 5.5 V

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Constant Current Accuracy:

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Channel-to-Channel = ±1%

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Device-to-Device = ±3%

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CMOS Logic Level I/O

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30-MHz Data Transfer Rate

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33-MHz Grayscale Control Clock

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Continuous Base LED Open Detection LOD:

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Detect LED opening and LED short to GND during display with auto output off function

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Thermal Shutdown TSD:

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Automatic shutdown at over-temperature conditions

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Restart under normal temperature

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Pre-Thermal Warning PTW:

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High temperature operation alert

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Readable Error Information:

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LED Open Detection LOD

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Thermal Error Flag TEF

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Pre-Thermal Warning PTW

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Noise Reduction:

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4-channel grouped delay to prevent inrush current

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Operating Temperature: -40°C to +85°C

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APPLICA ONS

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Monochrome, Multicolor, Full-Color LED Displays Using Multiplexing System

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LED Signboards Using Multiplexing System

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