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Fairchild Semiconductor has introduced a programmable light-emitting-diode (LED) blinker, which eliminates the need for a microprocessor to be in continuous operation mode.

The FAN5646 enables designers of mobile handsets, ultra-portable devices, consumer products and industrial/embedded systems to implement a blinking LED solution that can be programmed to create an enhanced visual experience.

With the proprietary Tinywire single-wire digital interface, the FAN5646 can be programmed with an LED blink rate and pattern.

When the FAN5646 is enabled, it will continually play these LED blink patterns until commanded by the microprocessor to stop.

Common approaches for solving this challenge include connecting the LED to an LDO regulator or an FET as well as a lithium-ion battery.

Both of these implementations require a microprocessor to be programmed with a blinking pattern, draining battery life as the microprocessor needs to be continually operating to maintain this pattern.

The FAN5646 lowers the overall solution cost while providing a number of features and benefits.

It minimises system power consumption; the internal programmable LED blink pattern allows the microprocessor to remain in sleep mode while the FAN5646 is operating.

The device also features: low power consumption during operation or when in shutdown mode; a Tinywire single-wire digital interface, providing designer flexibility to program different blink rates and patterns; up to two different pulse widths and blink rates that can be programmed; and a low drop-out voltage of 80mV, enabling the LED to be powered without the need for inductors or switching capacitors, minimising component count.

A reduced component count results in lower inventory and procurement costs along with an easier printed circuit board (PCB) layout.

The FAN5646’s small form factor saves valuable board space in ultra-portable applications.

The WL-CSP version occupies less than 0.80mm2.

The small standard package is a five-lead SC70.

The blinker is priced at USD0.50 (GBP0.31) each in quantities of 1,000 pieces or more.

Fairchild Semiconductor

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