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Six-digit LED driver with key scanning

TM1637 Working Principle

Learn how TM1637 works with an illustrated explanation and practical readings.

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TM1637 at a glance

Follow the labeled connections and functional stages

TM1637 working principle: illustrated functional stages, basic circuit and connections
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How it works

3 stages · Explore one step at a time

Step 1 / 3

Connect a common-anode display

GRID1–GRID6 feed the digit anodes; SEG1–SEG8 sink the corresponding segment cathodes.

Step 2 / 3

Write segment patterns

Choose sequential or fixed-address writes and acknowledge each byte.

Step 3 / 3

Set brightness and read keys

Display control selects one of eight PWM duties; 0x42 requests key data.

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