MAX6970 Datasheet | Maxim Integrated

Description The MAX6970 serial-interfaced LED driver provides eight open-drain, constant-current-sinking LED driver outputs rated at 36V. The device operates from a 3V to 5.5V supply. The MAX6970 supply and the LEDs’ supply can power up in any order. The constant-current outputs are programmed together up to 55m A using a single external resistor. The MAX6970 operates with a 25Mbps, industry-standard, 4-wire serial interface. The MAX6970 uses the industry-standard shift-registerplus-latch-type serial interface. The driver accepts data shifted into an 8-bit shift register using data input DIN and clock input CLK. Input data appears at output DOUT eight clock cycles later to allow cascading of multiple MAX6970s. The latch-enable input, LE, loads the 8 bits of shift register data into an 8-bit output latch to set which LEDs are on and which are off. The outputenable input, OE, gates all eight outputs on and off, and is fast enough to be used as a PWM input for LED intensity control. For applications requiring LED fault detection, refer to the MAX6981 data sheet that automatically detects open-circuit LEDs. For safety-related applications requiring a watchdog timer, refer to the MAX6980 data sheet, which includes a fail-safe feature that blanks the display if the serial interface bees inactive for more than 1s. The MAX6970 is one of a family of 10 shift-register-pluslatch-type LED drivers. The family includes 8-port and 16-port types, with 5.5V- or 36V-rated LED outputs, with and without open-circuit LED detection and watchdog. All versions operate from a 3V to 5.5V supply, and are specified over the -40°C to +125°C temperature range. Features - 25Mbps Industry-Standard 4-Wire Serial Interface at 5V - 3V to 5.5V Logic Supply - Eight Constant-Current LED Outputs Rated at 36V - Up to 55m A Continuous Current per Output - Output Current Programmed by Single Resistor - 3% Current Matching Between Outputs - 6% Current Matching Between ICs - -40°C to +125°C Temperature...