Drive Capability and Output Counts

– 80 mA (Current Sink) x 16 Bits

– 120 mA (Current Sink) x 8 Bits

Constant Current Output Range

– 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)

Constant Current Accuracy

– ±4% (Maximum Error Between Bits)

Voltage Applied to Constant Current Output

Terminals

– Minimum 0.4 V (Output Current 5 mA to

40 mA)

– Minimum 0.7 V (Output Current 40 to

80 mA)

256 Gray Scale Display

– Pulse Width Control 256 Steps

Brightness Adjustment

– 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)

Error Output Signal Check

– Check Error Output Signal Line Such as

Protection Circuit When Operating

Data Output Timing Selectable

– Select Data Output Timing for Shift

Register Relative to Clock

OVM (Output Voltage Monitor)

– Monitor Voltage on Constant Current

Output Terminals (Detect LED

Disconnection and Short Circuit)

WDT (Watchdog Timer)

– Turn Output Off When Scan Signal

Stopped

TSD (Thermal ShutDown)

– Turn Output Off When Junction

Temperature Exceeds Limit

Data Input

– Clock Synchronized 8 Bit Parallel Input

(Schmitt-Triggered Input)

Data Output

– Clock Synchronized 8 Bit Parallel Output

(3-State Output)

Input Signal Level . . . CMOS Level

Power Supply Voltage . . . 4.5 V to 5.5 V

Maximum Output Voltage . . . 17 V (Max)

Data Transfer Rate . . . 15 MHz (Max)

Gray Scale Clock Frequency

8 MHz (Max)

Operating Free-Air Temperature Range

–20
C to 85
C

100-Pin HTQFP Package (PD=4.7 W,

TA = 25°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.