STLED524 Datasheet, PDF (1/72 Pages) STMicroelectronics – Intelligent matrix LED display driver

STLED524
Intelligent matrix LED display driver
CSP 56 bumps 0.4 mm pitch 3.4x3.0 mm
Features
• Operating input voltage range from 2.7 V to
5.5 V
• 5x24 LED matrix driver
• Adjustable luminance separately for each LED
thanks to internal registers in 255 steps
• Internal registers store 2 patterns
• 4-way scroll function with the possibility to lock
column data
• PWM dimming in 255 steps
• Adjustable blanking time
• Automatic slope function
• Cycle time and slope time adjustable for each
dot separately
• SPI interface
• Integrated step-up converter with adjustable
output voltage
• Integrated LDO with 3.1 V output @ 80 mA
• Boost efficiency 92% at 350 mA
• 2.4 MHz switching frequency
• CSP 56 bumps 0.4 mm pitch 3.4x3.0 mm
Applications
• Appliance user interfaces
• Display driver for handheld units
Datasheet - preliminary data
Description
The STLED524 is a 5x24 dot matrix LED display
driver. It can drive each dot with a current up to 20
mA. Rows of the matrix are multiplexed. Each
LED in a row is driven by a separate low-side
current mirror. Current regulators are supplied by
an integrated boost DC-DC converter. Its output
voltage can be adjusted by the internal register to
optimize efficiency according to the type of LEDs
(their forward voltage). This reduces current
mirror power dissipation and improves overall
efficiency. The STLED524 also includes an
internal LDO regulator, which can provide a
supply voltage for an additional circuitry.
Maximum current, provided by each current
mirror, is adjusted by R_SET resistor. Current of
each LED (dot) can be dimmed in 255 steps due
to settings of internal registers.
The STLED524 features PWM dimming in 255
steps. Automatic slope function is also supported.
Cycle time and slope time can be adjusted for
each LED (dot) separately.
Two patterns can be stored in internal registers.
The automatic scrolling of the display content is
possible in 4 ways.
Table 1. Device summary
Order code
Package
Packaging
STLED524
CSP
Tape and reel
April 2014
DocID026217 Rev 1
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to
change without notice.
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