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MAX6978AEE Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX6978AEE Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 13 page 8-Port, 5.5V Constant-Current LED Driver with LED Fault Detection and Watchdog 6 _______________________________________________________________________________________ Pin Description PIN NAME FUNCTION 1 GND Ground 2 DIN Serial-Data Input. Data is loaded into the internal 8-bit shift register on CLK’s rising edge. 3 CLK Serial-Clock Input. Data is loaded into the internal 8-bit shift register on CLK’s rising edge. 4LE Load-Enable Input. Data is loaded transparently from the internal shift register to the output latch while LE is high. Data is latched into the output latch on LE's falling edge, and retained while LE is low. 5–12 OUT0–OUT7 LED Driver Outputs. OUT0–OUT7 are open-drain, constant-current sinking outputs rated to 5.5V. 13 OE Output-Enable Input. High forces outputs OUT0–OUT7 to high impedance, without altering the contents of the output latches. Low enables outputs OUT0–OUT7 to follow the state of the output latches. 14 DOUT Serial-Data Output. Data is clocked out of the 8-bit internal shift-register to DOUT on CLK’s rising edge. 15 SET LED Current Setting. Connect SET to GND through a resistor (RSET) to set the maximum LED current. 16 V+ Positive Supply Voltage. Bypass V+ to GND with a 0.1µF ceramic capacitor. PAD Exposed Pad* Exposed pad on package underside. Connect to GND. SERIAL-TO-PARALLEL SHIFT REGISTER LATCHES OUT0 OUT1 OUT2 DOUT DIN CLK OUT7 CONSTANT-CURRENT SINKS OUT5 OUT6 POWER-ON RESET V+ CURRENT REFERENCE V+ OE GND GND LE D0 D7 D0 D7 D0 D7 RSET MAX6978 FAULT DETECTION WATCH DOG Figure 1. MAX6978 Block Diagram *TSSOP package only. |
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