STP24DP05 Datasheet, PDF (1/26 Pages) STMicroelectronics – 24-bit constant current LED sink driver with output error detection

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
■ Shift register data flow registers control
■ Accepts 3.3 V and 5 V micro driver
■ Output current: 5-80 mA
■ 25 MHz clock frequency
■ High thermal efficiency package
Description
The STP24DP05 is a monolithic, low voltage, low
current power 24-bit shift register designed for
LED panel displays. The device contains a
8 x 3-bit serial-in, parallel-out shift register that
feeds a 8 x 3-bit D-type storage register. In the
output stage, twenty-four regulated current
sources were designed to provide 5-80 mA
constant current to drive the LEDs.
The 8x3 shift registers data flow sequence order
can be managed with two dedicated pins.
The STP24DP05 has a dedicated pin to activate
the outputs with a sequential delay, that will
prevent inrush current during outputs turn-ON.
The device detection circuit checks 3 different
conditions that can occur on the output line: short
to GND, short to V_O or open line.
TQFP48
The data detection results are loaded in the shift
registers and shifted out via the serial line output.
The detection functionality is activated with a
dedicated pin or as alternative, through a logic
sequence that allows the user to enter or exit from
detection mode.
Through three external resistors, users can adjust
the output current for each 8-channel group,
controlling in this way the light intensity of LEDs.
The STP24DP05 guarantees a 20 V output
driving capability, allowing users to connect more
LEDs in series.
The high clock frequency, 25 MHz, makes the
device suitable for high data rate transmission.
The 3.3 V of voltage supply is useful for
applications that interface any micro from 3.3 V.
Table 1.
Device summary
Order code
STP24DP05BTR
Package
TQFP48
Packaging
Tape and reel
May 2008
Rev 1
1/26
www.st.com
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