TM1629B SMD IC Digital display driver IC 7 SEGMENT SOP32 TM1629B

Product Overview:The TM1629B is a specialized LED driver and keyboard scanning controller, typically used in appliances like air conditioners, refrigerators, and home theater systems where both display output and user input (buttons) are required.

Core Specifications:

• Manufacturer: Titan Micro Electronics (TITAN MICRO)

• Package Type: SOP32

• Function: LED Display Driver with Keyboard Scanning Interface

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

Features

• Integrated Driver & Scanner: Combines LED high-voltage driving with keyboard scanning logic (8x2 bit matrix) in a single chip.

• Display Capacity: Supports up to 14 segments × 8 digits (112 LEDs total).

• Brightness Control: Integrated 8-level duty cycle adjustment for display dimming.

• Oscillation: Uses an internal RC oscillator (typically ~450–500 kHz).

• Interface: Communicates via a simple synchronous serial interface (CLK, STB, DIO).

• Reset: Built-in power-on reset circuitry ensures the chip starts in a known state.

Functional Breakdown

1. Display Driving: The chip uses a multiplexing technique (Grid/Segment scanning) to drive the LEDs. By rapidly switching through the "Grids" and applying data to the "Segments," it creates the illusion of a static display.

2. Keyboard Scanning: It allows you to connect a matrix of buttons. When a button is pressed, the chip detects the change in the matrix state and allows the MCU to read which key was activated via the serial interface.

3. Serial Communication: The MCU acts as the master, sending commands to set the display mode, brightness, and data to be shown, or reading back keyboard scan data.

Typical Applications

• Appliance Control Panels: Front-panel displays for major home appliances (fridges, AC units).

• Home Theater Systems: Display and button interface control for audio/video receivers.

• Industrial/Commercial Displays: Custom high-segment count LED interface panels.