STP24DP05 24-bit constant current LED sink driver with output error detection Features Low-voltage power supply down to 3 V 8 x 3 constant current output channels Adjustable output current through external resistors Short and open output error detection Serial data IN/parallel data OUT TQFP48-EP Shift register data flow register control The detection functionality is activated with a Accepts 3.3 V and 5 V micro driver dedicated pin or alternatively, through a logic Output current: 5-80 mA sequence that allows the user to enter or exit detection mode. 25 MHz clock frequency Through three external resistors, the user can High thermal efficiency package adjust the output current for each 8-channel group, therefore controlling the light intensity Description of LEDs. The STP24DP05 is a monolithic, low-voltage, low The STP24DP05 guarantees a 20 V output current power 24-bit shift register designed for driving capability, allowing the user to connect LED panel displays. The device contains an more LEDs in series. 8 x 3-bit serial-IN, parallel-OUT shift register that The high clock frequency, 25 MHz, makes the feeds a 8 x 3-bit D-type storage register. In the device suitable for high data rate transmission. output stage, twenty four regulated current sources were designed to provide 5-80 mA The 3.3 V of voltage supply is useful for constant current to drive the LEDs. applications that interface any microcontroller from 3.3 V. The 8 x 3 shift register data flow sequence order can be managed through two dedicated pins. The STP24DP05 has a dedicated pin to activate the outputs with a sequential delay, that prevents inrush current during output turn-ON. The device detection circuit checks 3 different conditions that can occur on the output line: short to GND, short to V , or open line. O The data detection results are loaded in the shift registers and shifted out via the serial line output. Table 1. Device summary Order code Package Packaging (1) STP24DP05BTR TQFP48-EP Tape and reel 1. Thermal pad size: 3.5 mm x 3.5 mm. February 2012 Doc ID 14714 Rev 5 1/27 www.st.com 27Contents STP24DP05 Contents 1 Summary description 3 1.1 Pin connection and description . 3 2 Electrical ratings 5 2.1 Absolute maximum ratings . 5 2.2 Thermal data . 5 2.3 Recommended operating conditions . 6 3 Electrical characteristics . 7 4 Block diagram 9 5 Equivalent circuit and outputs 10 6 Timing diagrams . 12 7 Features description 15 7.1 DG: gradual output delay . 15 7.2 Error detection condition . 15 7.3 Phase one: entering detection mode . 16 7.4 Phase two: error detection . 17 7.5 Phase three: resuming normal mode . 18 7.6 Shift register data flow control . 18 7.7 EFLAG/TFLAG - output detection and overtemperature monitoring 19 8 Typical application schematic 20 9 Typical characteristics 21 10 Package mechanical data 22 11 Revision history . 26 2/27 Doc ID 14714 Rev 5