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LED drivers with industry-standard SPI-compatible serial interface

Posted: 01 Nov 2005 ?? ?Print Version ?Bookmark and Share

Keywords:maxim integrated products? max6971? max6983? max6970? max6980?

Constant-current led drivers

Maxim Integrated Products has introduced the MAX6971/MAX6983 16-port and the MAX6970/MAX6980/MAX6981 8-port constant-current LED drivers that all feature a 25MHz, 4-wire, industry-standard SPI-compatible serial interface.

The 16 or 8 open-drain, constant-current-sinking LED driver outputs are rated at 36V. Using a single external resistor with a 2 percent current matching between outputs and 6 percent matching between cascaded devices, each port can sink up to 55mA for all LEDs. They operate from a 3V to 5.5V supply and are specified for the -40C to 125C operating range. All the devices are designed to support standard lighting and signage applications.

The MAX6971/MAX6983 16-port drivers use the industry-standard, shift-register-plus-latch-type serial interface. The driver accepts data shifted into a 16-bit shift register using data input, DIN and clock input, CLK. Input data appears at the DOUT output 16 clock cycles later to allow cascading of multiple devices. The latch-enable input, LE, loads the 16 bits of shift register data into a 16-bit output latch to determine which LEDs are on and which are off. The output enable, OE-bar, gates all 16 outputs on and off, and is fast enough to be used as a PWM input for LED intensity control, said Maxim.

Among the 8-port LED drivers, the MAX6970 provides standard, register-latched LED driver functionality. The MAX6981 adds LED open-circuit fault-detection.

The 16-port MAX6971/MAX6983 are available in 24-pin TSSOP and 24-pin narrow PDIP packages, while the 8-port MAX6970/MAX6980/MAX6981 are available in 16-pin TSSOP and PDIP packages. The price for the MAX6971 and MAX6083 16-port devices is $1.98 and $2.14, respectively; the MAX6970 is priced at 99 cents; the MAX6981 at $1.03; and the MAX6980 at $1.11. All driver prices are 1,000-up, FOB USA.

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