1 Features

1. 48 Constant-Current Sink Output Channels with

On or Off Control

. Current Capability:

. 34.9 mA for 32 Channels

. 24.4 mA 16 Channels

. No External Resistor for Current Setting

. Maximum Current Control (MC): 3 Bits (8 Steps)

. Global Brightness Control (BC) for Each Color

Group: 7 Bits (128 Steps), Three Groups

. LED Power-Supply Voltage: Up to 10 V

. VCC = 3.0 V to 3.6 V

. Constant-Current Accuracy:

. Channel-to-Channel = ±1% (typ), ±3% (max)

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

. Data Transfer Rate: 30 MHz

. BLANK Pulse Duration: 40 ns (min)

. LED Open Detection (LOD)

. LED Short Detection (LSD)

. Power-Save Mode (PSM): 7-μA Consumption,

High-Speed Recovery

. Undervoltage Lockout Sets Default Data

. Delayed Switching Minimizes Inrush Current

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

2 Applications

. LED Video Displays

. Variable Message Signs (VMS)

. Illumination

3 Description

The TLC5954 is a 48-channel, constant-current sink

LED driver. Each channel can be turned on or off by

writing data to an internal register. The output

channels (OUTXn) are grouped into three groups of

16 channels. Each channel group (R, G, and B) has a

128-step global brightness control (BC) function. The

maximum current value of all 48 channels can be set with an 8-step maximum current control (MC)

function. The device has two error flags: LED open

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

error flags can be read via a serial interface port. The device also has a power-save mode that sets the

total current consumption to 7 μA (typ) when all

outputs are off.