MAX6978 查看數據表（PDF） - Maxim Integrated

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MAX6978

8-Port, 5.5V Constant-Current LED Driver with LED Fault Detection and Watchdog

Maxim Integrated 

8-Port, 5.5V Constant-Current LED Driver with

LED Fault Detection and Watchdog

Pin Description

PIN

1

2

3

4

5–12

13

14

15

16

PAD

NAME

FUNCTION

GND

Ground

DIN

Serial-Data Input. Data is loaded into the internal 8-bit shift register on CLK’s rising edge.

CLK

Serial-Clock Input. Data is loaded into the internal 8-bit shift register on CLK’s rising edge.

LE

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.

OUT0–OUT7 LED Driver Outputs. OUT0–OUT7 are open-drain, constant-current sinking outputs rated to 5.5V.

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.

DOUT

Serial-Data Output. Data is clocked out of the 8-bit internal shift-register to DOUT on CLK’s rising edge.

SET

LED Current Setting. Connect SET to GND through a resistor (RSET) to set the maximum LED current.

V+

Positive Supply Voltage. Bypass V+ to GND with a 0.1µF ceramic capacitor.

Exposed Pad* Exposed pad on package underside. Connect to GND.

*TSSOP package only.

CLK

MAX6978

DIN

D0 SERIAL-TO-PARALLEL SHIFT REGISTER D7

LE

D0

LATCHES

D7

POWER-ON

RESET

WATCH

OE

DOG

V+

D0

CONSTANT-CURRENT SINKS

D7

FAULT DETECTION

CURRENT

REFERENCE

OUT0

OUT2

OUT1

Figure 1. MAX6978 Block Diagram

OUT5

OUT7

OUT6

GND

DOUT

V+

RSET

GND

6 _______________________________________________________________________________________

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