Drivings LED with limited pins

Mike Miller · 2014-03-10T22:34:48+00:00

All, I want to be able to toggle 23 separate LEDs in my application. The design challenge is that I only have about 17 pins available on my SoC. What are some options for this? 1.) Use another microcontroller with 23 available pins with some digital interface (spi/i2c) and then send over data to toggle the appropriate pins? 2.) Ideally I don't want to have to do additional firmware development on a second microcontroller. Thank you for any ideas. -Mike

Mar 10, 2014 61 Replies

Rate this thread:

John Fields 12 years ago

No TDM needed since 2 in series will get you up to 32 fully static constant-current outputs to drive the LEDs with only 3 bits in: serial data, data clock, and latch clock. John Fields

Vote

John Fields 12 years ago

Why would you want to use 3 when you can get by with one?

Vote

Join the Discussion

Have something to add? Share your thoughts — no account required.

Didn't find your answer?

Ask the community — no account required