Overview
The CAT4008Y-T2 is an 8-channel constant current driver designed by onsemi for LED billboard and various general display applications. This device allows for precise control over LED channel currents, which are programmed together using an external RSET resistor. It features low output voltage operation, starting as low as 0.4 V, enabling more power-efficient designs. The CAT4008Y-T2 includes a high-speed 4-wire serial interface with a clock frequency of up to 25 MHz, facilitating the control of each individual channel through a shift register and latch configuration.
Key Specifications
| Parameter | Range/Value | Units |
|---|---|---|
| VDD Supply Voltage | 3.0 to 5.5 | V |
| Logic Input/Output Voltage (SIN, SOUT, CLK, BLANK, LATCH) | −0.3 to VDD+0.3 | V |
| VLED 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 |
| Ambient Temperature Range | −40 to +85 | °C |
| LED Current Range | 2 to 100 | mA |
| CLK Clock Frequency | Up to 25 MHz | |
| Thermal Shutdown Temperature | 160 | °C |
| Thermal Hysteresis | 20 | °C |
Key Features
- 8 Constant Current-sink Channels
- 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: 0.4 V minimum on LED channels
- Thermal Shutdown Protection
- Available in 16-lead SOIC and TSSOP Packages
- Pb-Free, Halogen Free/BFR Free, and RoHS Compliant
- High-Speed 4-Wire Serial Interface for Channel Control
- Blanking Control Pin (BLANK) to Disable All Channels Independently
- Internal Pull-Up and Pull-Down Resistors for BLANK and LATCH Pins
Applications
- Billingboard Displays
- Marquee Displays
- Instrument Displays
- General Purpose Display Applications
Q & A
- What is the primary function of the CAT4008Y-T2?
The CAT4008Y-T2 is an 8-channel constant current driver designed for LED billboard and general display applications.
- How are the LED channel currents programmed in the CAT4008Y-T2?
The LED channel currents are programmed together using an external RSET resistor.
- What is the minimum output voltage operation for the LED channels?
The minimum output voltage operation for the LED channels is 0.4 V.
- 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 thermal shutdown temperature of the CAT4008Y-T2?
The thermal shutdown temperature is 160°C.
- What types of packages are available for the CAT4008Y-T2?
The device is available in 16-lead SOIC and TSSOP packages.
- Is the CAT4008Y-T2 RoHS compliant?
Yes, the CAT4008Y-T2 is Pb-Free, Halogen Free/BFR Free, and RoHS compliant.
- How does the BLANK pin function in the CAT4008Y-T2?
The BLANK pin is used to disable all LED channels independently of the serial interface.
- What is the purpose of the RSET pin in the CAT4008Y-T2?
The RSET pin is used to set the LED channel current, with each channel current being about 51 times the current pulled out of the RSET pin.
- Can multiple CAT4008Y-T2 devices be cascaded?
Yes, multiple devices can be cascaded using the serial data output pin (SOUT) connected to the serial data input pin (SIN) of the next device.
