Overview
The CAT4008W-T2, produced by onsemi, is an 8-channel constant current LED driver designed for LED billboard and general display applications. This device allows for precise control over LED currents through an external RSET resistor, enabling a wide range of current settings from 2 mA to 100 mA. The CAT4008W-T2 features a high-speed 4-wire serial interface with a clock frequency of up to 25 MHz, facilitating the programming of each LED channel independently. Additionally, it includes thermal shutdown protection and a blanking control pin to disable all channels simultaneously.
Key Specifications
| Parameter | Rating/Range | Units |
|---|---|---|
| VDD Supply Voltage | 3.0 to 5.5 | V |
| Logic Input/Output Voltage (SIN, SOUT, CLK, BLANK, LATCH) | −0.3 V to VDD+0.3 V | V |
| LEDn Voltage | 0.4 to 5.5 | V |
| DC Output Current on LED1 to LED8 | 150 | mA |
| Storage Temperature Range | −55 to +160 | °C |
| Junction Temperature Range | −40 to +150 | °C |
| Lead Soldering Temperature (10 sec.) | 300 | °C |
| CLK Clock Frequency | Up to 25 | MHz |
| LED Current Range | 2 to 100 | mA |
| Thermal Shutdown Temperature | 160 | °C |
| Thermal Hysteresis | 20 | °C |
Key Features
- 8 Constant Current-sink Channels
- High-speed 4-wire Serial Interface up to 25 MHz Clock Frequency
- LED Current Range from 2 mA to 100 mA set by External RSET Resistor
- Low Output Voltage Operation on LED Channels as Low as 0.4 V
- Thermal Shutdown Protection
- Blanking Control Pin to Disable All Channels Independently of the Interface
- Available in 16-lead SOIC and TSSOP Packages
- Pb-Free, Halogen Free/BFR Free, and RoHS Compliant
Applications
- Billboard Display
- Marquee Display
- Instrument Display
- General Purpose Display
Q & A
- What is the CAT4008W-T2 used for?
The CAT4008W-T2 is used as an 8-channel constant current LED driver for LED billboard and general display applications.
- How is the LED current set in the CAT4008W-T2?
The LED current is set using an external RSET resistor, allowing for a range of 2 mA to 100 mA.
- What is the maximum clock frequency of the serial interface?
The maximum clock frequency of the serial interface is up to 25 MHz.
- What is the purpose of the BLANK pin?
The BLANK pin is used to disable all LED channels simultaneously while maintaining the data in the latch register.
- What type of protection does the CAT4008W-T2 include?
The CAT4008W-T2 includes thermal shutdown protection to disable the LED outputs if the die temperature exceeds a set limit.
- In what packages is the CAT4008W-T2 available?
The CAT4008W-T2 is available in 16-lead SOIC and TSSOP packages.
- Is the CAT4008W-T2 RoHS compliant?
Yes, the CAT4008W-T2 is Pb-Free, Halogen Free/BFR Free, and RoHS compliant.
- What is the storage temperature range for the CAT4008W-T2?
The storage temperature range is −55 to +160 °C.
- What is the junction temperature range for the CAT4008W-T2?
The junction temperature range is −40 to +150 °C.
- How does the serial output data pin (SOUT) function?
The SOUT pin allows multiple devices to be cascaded and programmed via one serial interface.
