Rainbow-electronics MAX6975 Bedienungsanleitung PDF herunterladen (Seite 12)

MAX6974/MAX6975

Multiplexed vs. Nonmultiplexed Operation

The MAX6974/MAX6975 can double the number of

LEDs driven from 24 to 48 through multiplexing. When

multiplexing, the two outputs, MUX0 and MUX1, drive

two external pnp transistors, such as FMMTL717, used

as common-anode power switches (see Figure 5).

24-Output PWM LED Drivers

for Message Boards

12 ______________________________________________________________________________________

(REDS)

(REDS) (GREENS) (GREENS) (BLUES) (BLUES)

FMMTL717

560Ω

180Ω

120pF

+5.55V

FMMTL717

560Ω

180Ω

120pF

MUX0

MUX1

SUBFRAME 15

MUX1

16,384 CLKs

SUBFRAME 0

MUX0

16,384 CLKs

SUBFRAME 0

MUX1

16,384 CLKs

SUBFRAME 1

MUX0

16,384 CLKs

SUBFRAME 1

MUX1

16,384 CLKs

SUBFRAME 14

MUX0

16,384 CLKs

SUBFRAME 14

MUX1

16,384 CLKs

SUBFRAME 15

MUX0

16,384 CLKs

SUBFRAME 15

MUX1

16,384 CLKs

SUBFRAME 0

MUX0

16,384 CLKs

ONE COMPLETE 524,288 CLOCK CYCLE MULTIPLEXED VIDEO FRAME

Figure 5. MAX6975 Multiplexing Two Sets of Eight RGB Pixels with a Single LED Supply and Subframe Timing

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 22 23

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