Pin description – Rainbow Electronics MAX6971 User Manual

Page 6

MAX6971

16-Port, 36V Constant-Current LED Driver

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Pin Description

PIN

NAME

FUNCTION

GND

Ground

DIN

Serial-Data Input. Data is loaded into the internal 16-bit shift register on CLK’s rising edge.

CLK

Serial-Clock Input. Data is loaded into the internal 16-bit shift register on CLK’s rising edge.

Load - E nab l e Inp ut. D ata i s l oad ed tr ansp ar entl y fr om the i nter nal shi ft r eg i ster ( s) to the outp ut l atch( es)
w hi l e LE i s hi g h. D ata i s l atched i nto the outp ut l atch( es) on LE ’ s fal l i ng ed g e, and r etai ned w hi l e LE i s l ow .

5–20

OUT0–OUT15

LED Driver Outputs. OUT0 to OUT15 are open-drain, constant-current-sinking outputs rated to 28V.

Output-Enable Input. High forces outputs OUT0 to OUT15 high impedance, without altering the contents
of the output latches. Low enables outputs OUT0 to OUT15 to follow the state of the output latches.

DOUT

Serial-Data Output. Data is clocked out of the 16-bit internal shift register to DOUT on CLK’s rising edge.

SET

LED Current Setting. Connect SET to GND through a resistor (R

SET

) to set the maximum LED current.

V+

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

SERIAL-TO-PARALLEL SHIFT REGISTER

LATCHES

OUT0

OUT1

OUT2

DOUT

DIN

CLK

OUT15

CONSTANT-CURRENT SINKS

OUT3

OUT4

POWER-ON

RESET

V+

CURRENT

REFERENCE

GND

D15

SET

MAX6971

V+

Figure 1. Block Diagram