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.