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Six-digit LED driver with key scanning

TM1637 Basic Circuit

Build a basic TM1637 circuit with labeled pins, component values and connection guidance.

Package view

TM1637 in a circuit

5 V host, bidirectional data, pull-ups and local bypassing.

Physical TM1637 DIP20 and six common-anode digits, shared segment cathodes, distinct grid anodes, 10k pull-ups and supply bypass capacitors.
Matching net names connect; each display bus represents separate wires. Optional segment resistors must be selected for the actual LED and pulse-current limits.

Connect it, step by step

Follow the component values and pin connections

Power and bypass

Use regulated 5 V, common ground, 100 nF and 100 µF near the IC.

Release DIO for ACK

Pull CLK and DIO up through 10 kΩ and use a compatible host.

Write and enable

Write the six display bytes with 0x40 / 0xC0, then enable with 0x8B. K1/K2 are unused in this example.

Component view