Rainbow-electronics MAX6973 Manual de usuario descargar pdf (Pagina 12)

MAX6972/MAX6973

Multiplexed vs. Nonmultiplexed Operation

The MAX6972/MAX6973 can double the number of

LEDs driven from 16 to 32 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).

16-Output PWM LED Drivers

for Message Boards

12 ______________________________________________________________________________________

+5.55V

FMMTL717

(REDS)

(GREENS)

560Ω

180Ω

120pF

+5.55V

FMMTL717

560Ω

180Ω

120pF

SUBFRAME 31

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 NONMULTIPLEXED VIDEO FRAME

MUX0

MUX1

Figure 5. MAX6973 Multiplexing Two Sets of Eight RG 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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Rainbow-electronics MAX6973 Manual de usuario Pagina 12

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