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Six-digit LED driver with key scanning

TM1637 Internal Circuitry

Explore the internal circuitry and functional stages of TM1637.

Package view

Inside TM1637

Compact functional view of serial, display and key-scan blocks.

TM1637 functional blocks within a silver-leaded IC: serial interface, command decoder, six-byte RAM, oscillator, PWM, segment/grid drivers and key scan.
Original functional illustration; not a transistor-level die schematic.

Explore the circuit

Select a stage to see its role and connections

Receive and acknowledge

The two-wire front end recognizes START, bytes, ACK and STOP.

Store display bytes

Six RAM addresses retain raw segment patterns.

Scan LEDs and keys

Grid timing, segment sinks and the key returns work from the internal oscillator.

Component view