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STMicro shift register controls automotive LEDs

Posted: 21 May 2002 ?? ?Print Version ?Bookmark and Share

Keywords:stpic6595? shift register? logic ic? led driver? led controller?

STMicroelectronics has introduced the STPIC6595 power-logic 8-bit shift register that features low-side DMOS output transistors that can drive 100mA loads, including automobile LEDs for turn signals, relays, and solenoids.

The chip also features a typical on-resistance of 4 ohms to conserve energy and spike-suppressing 33V output voltage clamps to withstand inductive loads.

The logic side of STPIC6C595 has an 8-bit serial-in, parallel-out shift register feeding an 8-bit D-type storage register. Both registers are independently clocked and are provided with separate control signals to clear the shift register and enable the output buffer.

A serial-out pin is also provided to allow several of the ICs to be cascaded.

On the power side, the output of the STPIC6C595 consists of eight low-side, open-drain DMOS transistors rated for 33V and 100mA of continuous sink capability. Output current is limited to 250mA (25C) and decreases as the temperature increases.

The chip's built-in voltage clamps are each rated to absorb avalanche energy of 30mJ, while the chip itself withstands ESD spikes of up to 1.5kV (HBM) and 200V (MM).

The STPIC6C595 is rated for operation at case temperatures of -40C to 125C and comes in SO-16 or TSSOP-16 packages.

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