TM1629A SMD IC digital display driver SOP32 7 SEGMENT TM1629A

Overview

The TM1629A is a dedicated LED drive control circuit designed by Titan Micro Electronics. It integrates an MCU digital interface, data latches, and high-voltage LED drivers, making it ideal for high-end displays in home appliances like refrigerators, air conditioners, and home theater systems.

Key Features

• Fabrication & Package: Uses power CMOS process and is available in a SOP32 package.

• Display Capacity: Supports a display mode of 16 segments × 8 bits.

• Brightness Control: Features built-in dimming circuitry with 8 levels of adjustable duty cycles.

• Communication Interface: Uses a standard 3-wire serial interface consisting of CLK, STB, and DIO pins.

• Internal Functions:

  • Equipped with a built-in RC oscillator (450KHz ±5%).

  • Includes an internal power-on reset circuit.

  • Operates on a logic supply voltage (VDD) of 5V ±10%.

Pin Functions

• DIO: Data input; accepts serial data on the rising edge of the clock, starting from the least significant bit.

• STB: Chip select/strobe; used to initialize the serial interface. When STB is low, the first byte received is treated as a command.

• CLK: Clock input; serial data is input on the rising edge.

• SEG1–SEG16: Segment output pins (P-channel open-drain).

• GRID1–GRID8: Grid (digit) output pins (N-channel open-drain).

Design Considerations

• Output Polarity: The SEG pins are P-channel open-drain and must connect to the LED anodes. The GRID pins are N-channel open-drain and must connect to the LED cathodes; they cannot be reversed.

• Noise Suppression: Place filtering capacitors for VDD and GND as close to the TM1629A chip as possible. Adding 100pF capacitors to the DIO, CLK, and STB lines helps reduce interference.

• Voltage Requirements: Because blue LED displays have a forward voltage drop of approximately 3V, it is recommended to power the TM1629A with 5V.