Product category:
Power Supply ICs and Controllers
News Release from: Rohm Electronics | Subject: LED drivers with built in shift registers
Edited by the Electronicstalk Editorial
Team on 18 December 2002
LED drivers have built in shift
registers
Combining LED drivers with a choice of 8-, 12- or 16-bit shift registers, Rohm's latest single-chip driver ICs simplify LED display design.
Combining LED drivers with a choice of 8-, 12- or 16-bit shift registers, Rohm's latest single-chip driver ICs simplify LED display design, reduce component count and minimise power consumption by allowing a serial signal from a microprocessor to control up to 16 LEDs Rohm's series of LED drivers with built in shift registers includes devices that can be cascaded, making them ideal in areas such as public information boards for tram and subway applications as well as audio equipment where large numbers of LEDs need to be driven
This article was originally published on Electronicstalk on 7 Feb 2001 at 8.00am (UK)
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In addition, because the output terminals of the ICs are specified for high-voltage usage, the devices will also suit a variety of office automation and industrial applications.
Providing a drive capability of 50mA with a constant current output, the Rohm BD7851FP features a 16bit shift register and offers open collector outputs.
The BU2092/F/FV and BU2099/F/FV both provide a 12bit shift register, open drain outputs and drive currents of 20mA, while the BU2098/F/FV devices incorporate an 8bit shift register, open drain outputs and deliver maximum drive currents of 10mA.
Rohm's BD7851FP is designed for a 5.0V operating voltage and allows the constant current output to be set using only one external resistor with the result that 16 current limiting resistors for the LEDs can be saved.
The IC is equipped with an enable terminal, power on reset functionality, and built-in temperature protection, and can be cascaded if necessary.
The BU2092F/FV and BU2099/F/FV ICs will operate with voltages between 2.7 and 5.5V and both offer an terminal that forces the output to high impedance regardless of data.
Key features of the BU2098/F/FV, which also operates with a 2.7-5.5V supply, are an I2C interface, power on reset functionality, and a chip-select terminal that allows up to eight devices to be cascaded.
Supplied in a variety of packages including HSOP25, DIP16/18/20, SOP16/18/20 and SSOP-B20, Rohm's new drivers have a wide operating temperature range between -25 and +75C.
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