Drive Capability and Output Counts:

– 80 mA (Current Sink) × 16 Bits

– 120 mA (Current Sink) × 8 Bits

Constant Current Output Range:

– 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)

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 mA 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 Shut Down):

– Turn Output Off When Junction

Temperature Exceeds Limit

Data Input:

– Clock Synchronized 1 Bit Serial Input

(Shmitt-Triggered Input)

Data Output:

– Clock Synchronized 1 Bit Serial Output

(3-State Output)

Input Signal Level:

– CMOS Level

Power Supply Voltage . . . 4.5 V to 5.5 V

Maximum Output Voltage . . . 17 V

Data Transfer Rate . . . 15 MHz (Max

Gray Scale Clock Frequency . . . 8 MHz

(Max)

Operating Free-Air Temperature Range

–20°C to 85°C

64-Pin HTQFP Package (PD = 4.9 W,

TA = 25°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.