10pc Worldsemi WS2801SO 3 Channel RGB Constant Current PWM LED Driver WS2801

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160677260085

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Last updated on Nov 10, 2012 17:28:43 EST View all revisions

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NooElec

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Optoelectronics & Displays

10pc Worldsemi WS2801SO 3-Channel Constant Current LED Driver SOP; PWM Control

Product Details
Manufacturer	Worldsemi
Model	WS2801SO
Quantity	10

Technical Details
Datasheet
Package Type	SOP-14
Number of Pins	14
Supply Voltage	3.3V - 5.5V DC
Output Current	5-150mA total

Product Information

Open-source Arduino library available here.

Open-source AVR studio library will be available soon
(targeted towards our ATmega32U2-based NooGroove boards sold in our store)

A very useful IC, providing a low-cost way of driving RGB LEDs. There are 3 24-bit channels per IC, so for full addressable control of a string or array of RGB LEDs you would need 1 IC per RGB LED. WS2801 are meant to control common anode RGB LEDs. We have both diffused and clear lens types of RGB LEDs available which work great with this controller.

WS2801 can be operated in both constant current and constant voltage modes.

They employ a 2-wire serial data connection, similar to SPI or I2C. ICs are chained together which means whole strings can be controlled using just 2 pins on your microcontroller.

Data is clocked in starting with the MSB of the red gray scale data and ending with the LSB of the blue gray scale data. See picture below for details. Plenty more information available in the datasheet.

We have found these ICs are sensitive to power supply issues, so don't forget to add a decoupling capacitor between Vcc and Gnd pins. Although specified for a 25MHz clock we'd recommend clocking in data at <2MHz, especially for longer strings.

Features:

Supports both constant voltage and constant current drive mode
Programmable constant LED drive current
Wide constant output current range 5~150mA
Build in PWM dimming scheme for each output channel, supports free-run, especially suitable for low cost controller application
PWM free-run capability(refresh rate(2.5KHz)
Build in buffers to cascading data and clock to the next driver
Output polarity reverse function
Support hot swap
Maximum input clock frequency 25MHz
Power supply voltage 3.3~5.5V

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Item location: Niagara Falls, New York, United States

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NooElec is now proud to offer a 14-day no-questions-asked return policy. There are a few caveats to note: 1. Buyer is to pay all shipping charges. 2. For 'free shipping' items a 20% restocking fee will apply. 3. Items must be returned in the same condition as it was shipped. DOA items are excluded from these rules and will be exchanged or replaced free of charge as always. The above policy DOES NOT APPLY to items specified as 'as-is' in the auction listing.

Return policy details

NooElec is now proud to offer a 14-day no-questions-asked return policy. There are a few caveats to note: 1. Buyer is to pay all shipping charges. 2. For 'free shipping' items a 20% restocking fee will apply. 3. Items must be returned in the same condition as it was shipped. DOA items are excluded from these rules and will be exchanged or replaced free of charge as always. The above policy DOES NOT APPLY to items specified as 'as-is' in the auction listing.

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10pc Worldsemi WS2801SO 3-Channel (RGB) Constant Current PWM LED Driver; WS2801

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