CH457

Overview:

CH457 is a LED display driver chip for 128 LEDs. It features a built-in clock oscillator circuit, capable of dynamically driving 128 LEDs arranged in a 32-bit 4-stage structure or a 16-bit 8-stage structure. CH457 exchanges data with microcontrollers and other devices through a 2-wire or 3-wire serial interface.

Features:

• Built-in display current driving levels, segment current not less than 25mA, and character current not less than 120mA.
• Dynamic display scan control, directly driving 128 LEDs arranged in a 32-bit 4-stage structure or a 16-bit 8-stage structure.
• Internal current limiting, providing 8-level brightness control through duty cycle setting.
• High-speed 2-wire or 3-wire serial interface, clock speed ranging from 0 to 2MHz. Universal 2-wire compatibility with the I2C bus, saving pins.
• Built-in clock oscillator circuit, eliminating the need for an external clock or oscillator component, enhancing resistance to interference.
• Automatic low-power sleep mode for energy conservation.
• Enhanced ESD performance of 8KV.
• Supports low-cost single-panel PCB wiring.
• Package form: SOP28, lead-free packaging, RoHS compliant.