TLC5904

LED DRIVER

SLLS391 – NOVEMBER 1999

1

POST OFFICE BOX 655303

– 80 mA (Current Sink) x 16 Bits

– 120 mA (Current Sink) x 8 Bits

– 5 to 80 mA/10 to 120mA (Selectable by

MODE Terminal) (Current Value Setting for

All Output Terminals Using External

Resistor and Internal Brightness Control

Register)

–

±4% (Maximum Error Between Bits)

Terminals

– Minimum 0.4 V (Output Current 5 mA to

40 mA)

– Minimum 0.7 V (Output Current 40 to

80 mA)

– Pulse Width Control 256 Steps

– Output Current Adjustment for 32 Steps

(Adjustment for Brightness Deviation

Between LED Modules)

– 8 Steps Brightness Control by 8 Times

Speed Gray Scale Control Clock

(Brightness Adjustment for Panel)

– Check Error Output Signal Line Such as

Protection Circuit When Operating

– Select Data Output Timing for Shift

Register Relative to Clock

– Monitor Voltage on Constant Current

Output Terminals (Detect LED

Disconnection and Short Circuit)

– Turn Output Off When Scan Signal

Stopped

– Turn Output Off When Junction

Temperature Exceeds Limit

– Clock Synchronized 8 Bit Parallel Input

(Schmitt-Triggered Input)

– Clock Synchronized 8 Bit Parallel Output

(3-State Output)

8 MHz (Max)

–20

_C to 85_C

description

The TLC5904 is a constant current driver incorporating shift register, data latch, and constant current circuitry

with current value adjustable and a 256 gray scale display using pulse width control. The output current can be

selected as maximum 80 mA with 16 bits or 120 mA with 8 bits, and the current value of constant current output

can be set by one external resistor. After this device is mounted on a PCB, the brightness deviation between

LED modules (ICs) can be adjusted by external data input, and the brightness control for the panel can be

accomplished by the brightness adjustment circuitry. Also, the device incorporates the output voltage monitor

(OVM) used for LED open detection (LOD) by monitoring the constant current output. Moreover, the device

incorporates watchdog time (WDT) circuitry, which turns the constant current output off when a scan signal is

stopped at the dynamic scanning operation, and thermal shutdown (TSD) circuitry, which turns the constant

current output off when the junction temperature exceeds the limit.

Copyright

© 1998, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.