CATALYST Manuals

This guide describes how to use Express Setup to initially configure your Catalyst 3560-C and 2960-C switches. It also covers switch management options, basic installation, port and module connectivity, and troubleshooting.

The CAT4240 is a DC/DC step-up converter that delivers an accurate constant current ideal for driving LEDs. Operation at a fixed switching frequency of 1MHz allows the device to be used with small value external ceramic capacitors and inductor. LEDs connected in series are driven with a regulated current set by the external resistor R1. The CAT4240 high-voltage output stage is perfect for driving mid-size and large panel displays containing up to ten white LEDs in series. LED dimming can be done by using a DC voltage, a logic signal, or a pulse width modulation (PWM) signal. The shutdown input pin allows the device to be placed in power-down mode with “zero” quiescent current. In addition to

The CAT24WC128 is a 128K-bit Serial CMOS E2PROM internally organized as 16384 words of 8 bits each. It features a write protect function, 100,000 program/erase cycles, 100-year data retention, and low power CMOS technology.

CAT3636 is a high efficiency quad-mode fractional charge pump that can drive up to six LEDs programmable by a one wire digital interface. It has features such as high efficiency up to 92%, low noise input ripple, short circuit protection, thermal shutdown protection, etc.

The CAT811 and CAT812 are microprocessor supervisory circuits that monitor power supplies.

The CAT24WC256 is a 256K-bit Serial CMOS EEPROM internally organized as 32,768 words of 8 bits each. It features a write protect function, supports 100,000 program/erase cycles, and has a data retention period of 100 years. It utilizes low power CMOS technology, has a 64-byte page write buffer, and operates via the I2C bus serial interface.

The CAT3643 is a high efficiency Quad-Mode® fractional charge pump that can drive up to three LEDs programmable by a one wire digital interface. The inclusion of a 1.33x fractional charge pump mode increases device efficiency by up to 10% over traditional 1.5x charge pumps with no added external capacitors. Low noise input ripple is achieved by operating at a constant switching frequency which allows the device to provide up to 92% power efficiency in any mode.

The CAT5114 is a digitally programmable potentiometer designed by Catalyst Semiconductor as an electronic replacement for mechanical potentiometers and trim pots. It is ideal for automated adjustments on high volume production lines, and is also well suited for applications where equipment requiring periodic adjustment is either difficult to access or located in a hazardous or remote environment.

The CAT4238 is a DC/DC step-up converter from Catalyst Semiconductor that provides an accurate constant current ideal for driving LEDs. It features high efficiency, low quiescent current, adjustable output current, low noise, soft start, etc.

CAT1024, CAT1025 are complete memory and supervisory solutions for microcontroller-based systems. A 2k-bit serial EEPROM memory and a system power supervisor with brown-out protection are integrated together in low power CMOS techno-logy. Memory interface is via a 400kHz I2C bus. The CAT1025 provides a precision VCC sense circuit and two open drain outputs: one (RESET) drives high and the other (RESET) drives low whenever VCC falls below the reset threshold voltage. The CAT1025 also has a Write Protect input (WP). Write operations are disabled if WP is connected to a logic high. The CAT1024 also provides a precision VCC sense circuit, but has only a RESET output and does not have a Write Protect input.

The CAT4016 is a 16 channel constant current driver for LED billboard and other general display applications. LED channel currents are programmed together via an external RSET resistor. Low output voltage operation on the LED channels as low as 0.4V (for 2 to 100mA LED current) allows for more power efficient designs. A high-speed 4-wire serial interface of up to 25MHz clock frequency controls each individual channel using a shift register and latch configuration. A serial output data pin (SOUT) allows multiple devices to be cascaded and programmed via one serial interface. The device also includes a blanking control pin (BLANK) that can be used to disable all channels independently of the interface. Thermal shutdown protection is incorporated in the device to disable the LED outputs if the die temperature exceeds a set limit.

The CAT5419 is a dual Digitally Programmable Potentiometers (DPP™) with 64 taps and a 2-wire interface. It features two linear-taper digital potentiometers, 64 resistor taps per potentiometer, end to end resistance of 2.5kΩ, 10kΩ, 50kΩ or 100kΩ, potentiometer control and memory access via a 2-wire interface (I2C like), low wiper resistance of typically 80, four non-volatile wiper settings for each potentiometer, recall of wiper settings at power up, 2.5 to 6.0 volt operation, standby current less than 1µA, 1,000,000 nonvolatile WRITE cycles, 100 year nonvolatile memory data retention, 24-lead SOIC and 24-lead TSSOP packages, and write protection for the data register.

CAT5113 100-Tap Digitally Programmable Potentiometer (DPP™) is a 100-position linear taper potentiometer that can be used for automated product calibration, remote control adjustments, offset, gain and zero control, tamper-proof calibrations, contrast, brightness and volume controls, motor controls and feedback systems.