1 Features

1. 48 Constant-Current Sink Output Channels

. Sink Current Capability with Maximum MC, DC,

and BC Data:

. 23.9 mA (VCC ≤ 3.6 V, MC = 5)

. 31.9 mA (VCC > 3.6 V, MC = 7)

. Grayscale (GS) Control:

. 16-Bit (65,536 Steps) with Enhanced Spectrum

or Conventional PWM

. Maximum Current (MC) Control:

. 3 Bits (8 Steps) with a 3-mA to 30-mA Range

. 3 MC Sets for Each Color Group

. Dot Correction (DC) Control:

. 7 Bits (128 Steps) with a 26.2% to 100%

Range

. Global Brightness Control (BC):

. 7 Bits (128 Steps) with a 10% to 100% Range

. 3 BC Sets for Each Color Group

. LED Power-Supply Voltage: Up to 10 V

. VCC: 3.0 V to 5.5 V

. Constant-Current Accuracy:

. Channel-to-Channel: ±2% (typ), ±5% (max)

. Device-to-Device: ±2% (typ), ±4% (max)

. Data Transfer Rate: 25 MHz

. Grayscale Control Clock: 33 MHz

. Auto Display Repeat

. Display Timing Reset

. Auto Data Refresh (GS and DC Only)

. LED Open Detection (LOD)

. LED Short Detection (LSD)

. UVLO Sets Default Data

. Delay Switching to Prevent Inrush Current

. Operating Temperature: .40°C to +85°C

2 Applications

• LED Video Displays

• Variable Message Signs (VMS)

• Illumination

3 Description

The TLC5955 is a 48-channel, constant-current sink

driver. Each channel has an individually-adjustable, pulse width modulation (PWM), grayscale (GS)

brightness control with 65,536 steps and 128 steps of

constant-current dot correction (DC). DC adjusts

brightness deviation between channels. All channels

have a 128-step global brightness control (BC). BC adjusts brightness deviation between the R, G, B

color group. The eight-step maximum current control

(MC) selects the maximum output current range for

all channels of each color group. GS, DC, BC, and

MC data are accessible with a serial interface port.

The TLC5955 has two error flags: LED open

detection (LOD) and LED short detection (LSD). The

error detection results can be read with a serial

interface port.