Overview
The STLED524 is a 5x24 dot matrix LED display driver produced by STMicroelectronics. This component is designed to drive each dot of the matrix with a current up to 20 mA, with rows of the matrix being multiplexed. Each LED in a row is driven by a separate low-side current mirror, and the current regulators are supplied by an integrated boost DC-DC converter. The output voltage of the converter can be adjusted to optimize efficiency based on the type of LEDs used, reducing current mirror power dissipation and improving overall efficiency. The STLED524 also includes an internal LDO regulator that can provide a supply voltage for additional circuitry.
Key Specifications
| Specification | Value |
|---|---|
| Operating Input Voltage Range | 2.7 V to 5.5 V |
| LED Matrix Size | 5x24 |
| Maximum Current per LED | 20 mA |
| Dimming Steps | 255 steps |
| Internal Registers for Patterns | 2 patterns |
| Scroll Function | 4-way scroll with column data lock |
| PWM Dimming | 255 steps |
| Blanking Time | Adjustable |
| Automatic Slope Function | Supported |
| Cycle and Slope Time Adjustment | Adjustable for each dot separately |
| Interface | SPI interface |
| Integrated Step-Up Converter | Adjustable output voltage |
| Integrated LDO | 3.1 V output @ 80 mA |
| Boost Efficiency | 92% at 350 mA |
| Switching Frequency | 2.4 MHz |
| Package Type | CSP 56 bumps, 0.4 mm pitch, 3.4x3.0 mm |
Key Features
- Operating input voltage range from 2.7 V to 5.5 V
- 5x24 LED matrix driver
- Adjustable luminance separately for each LED 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 of 92% at 350 mA
- 2.4 MHz switching frequency
- CSP 56 bumps 0.4 mm pitch 3.4x3.0 mm package
Applications
The STLED524 is suitable for various applications, including:
- Appliance user interfaces
- Display drivers for handheld units
- Industrial displays and control panels
Q & A
- What is the operating input voltage range of the STLED524?
The operating input voltage range of the STLED524 is from 2.7 V to 5.5 V. - How many LEDs can the STLED524 drive?
The STLED524 can drive a 5x24 LED matrix. - What is the maximum current per LED that the STLED524 can provide?
The maximum current per LED is up to 20 mA. - How many steps of dimming does the STLED524 support?
The STLED524 supports dimming in 255 steps. - Does the STLED524 have an integrated step-up converter?
Yes, the STLED524 includes an integrated step-up converter with adjustable output voltage. - What is the switching frequency of the boost converter in the STLED524?
The switching frequency is 2.4 MHz. - What type of package does the STLED524 come in?
The STLED524 comes in a CSP 56 bumps package with a 0.4 mm pitch and dimensions of 3.4x3.0 mm. - Does the STLED524 support PWM dimming?
Yes, the STLED524 supports PWM dimming in 255 steps. - Can the STLED524 store multiple display patterns?
Yes, the STLED524 can store two patterns in its internal registers. - Is the STLED524 RoHS compliant?
Yes, the STLED524 is RoHS compliant.
