TLC5905

LED DRIVER

SLLS401 – NOVEMBER 1999

1

POST OFFICE BOX 655303

– 80 mA (Current Sink)

× 16 Bits

– 120 mA (Current Sink)

× 8 Bits

– 5 mA to 80 mA/10 mA to 120 mA

(Selectable by MODE Terminal) (Current

Value Setting for All Output Terminals

Using External Resistor and Internal

Brightness Control Register)

Error Between Bits)

Terminals:

– Minimum 0.4 V (Output Current 5 mA to

40 mA)

– Minimum 0.7 V (Output Current 40 mA 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 1 Bit Serial Input

(Shmitt-Triggered Input)

– Clock Synchronized 1 Bit Serial Output

(3-State Output)

– CMOS Level

(Max)

–20

°C to 85°C

description

The TLC5905 is a constant current driver that incorporates shift register, data latch, constant current circuitry

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

be selected as maximum 80 mA with 16 bits or 120 mA with 8 bit. The current value of the constant current output

is set by one external resistor. After this device is mounted on a printed-circuit board (PCB), the brightness

deviation between LED modules (ICs) can be adjusted using an 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 constant current output.

Moreover, the device incorporates watchdog timer (WDT) circuitry, which turns constant current output off when

the scan signal stops during dynamic scanning operation, and thermal shutdown (TSD) circuitry, which turns

constant current output off when the junction temperature exceeds the limit.

Copyright

© 1999, 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.