TM1629C SMD IC Digital display driver IC 7 SEGMENT SOP32 TM1629C

Product Overview:The TM1629C is a specialized LED driver and keyboard scanning controller, similar to the TM1629B, but optimized for slightly different display configurations. It is primarily designed for high-segment display applications in home appliances.

Core Specifications

• Manufacturer: Titan Micro Electronics (TITAN MICRO)

• Package: SOP32

• Display Capacity: 15 segments × 8 digits.

• Keyboard Scanning: 8 × 1 bit matrix.

• Control Interface: 3-wire synchronous serial interface (CLK, STB, DIO).

• Brightness Control: 8-level duty cycle adjustment.

Key Differences & Functional Notes

• Display Addressing: The TM1629C uses addresses C0H to CFH for its 16-byte display register.

• Keyboard Matrix: Unlike the TM1629B (which uses an 8x2 matrix), the TM1629C uses an 8x1 bit keyboard scan matrix.

• Electrical Requirements:

  • It operates on a logic supply voltage of 5V.

  • DIO Pull-up: When reading keys, you must connect an external pull-up resistor (1kΩ to 10kΩ) to the DIO line; the manufacturer recommends 10kΩ.

  • Timing: When reading data, there is a required wait time of at least 2µs between the command and data readout.

Design Considerations

• Multiplexing: The device utilizes an N-channel open-drain output for Grids (GRID1–GRID8) and a P-channel open-drain output for Segments (SEG1–SEG15).

• PCB Layout: To ensure stable operation, keep the filter capacitors between $V_{DD}$ and GND as close to the chip as possible.

• Noise Reduction: Adding a 100pF capacitor to the DIO, CLK, and STB lines is recommended to minimize interference on the communication pins.

For complex systems, ensure you follow the address auto-increment or fixed-address programming flows as outlined in the provided documentation to correctly map your LED segments to the specified register addresses.