CH452A

The CH452 chip has several features mentioned in the document: 1. It has built-in clock oscillation circuit for dynamic driving of 8-digit displays or 64 LEDs, with functions like BCD decoding, blinking, shifting, segment addressing, and column decoding . 2. It can scan up to 64 keys on a keyboard and exchange data with a microcontroller via a cascading 4-wire serial interface or a 2-wire serial interface . 3. It provides a reset signal to the microcontroller upon power-up . 4. It has internal current driving levels, with segment current not less than 20mA and digit current not less than 100mA . 5. It supports various display control functions such as left/right shifting, blinking control, brightness control, and independent control of segments or LEDs . 6. It offers options for non-decoding or BCD decoding of segment data, as well as custom BCD codes for special characters . 7. It allows for individual control of each digit's blinking and offers 16 levels of brightness control through duty cycle settings . 8. It supports scanning limits for 1 to 8 digits, allocating scan time only to active digits . 9. It can drive common cathode displays and scan up to 64 keys on a keyboard . CH452芯片具有以下功能： 1. 具有内置时钟振荡电路，可动态驱动8位数码管或64只LED，具有BCD译码、闪烁、移位、段位寻址和光柱译码等功能。 2. 可扫描多达64个键盘按键，并通过级联的4线串行接口或2线串行接口与微控制器交换数据。 3. 在上电时向微控制器提供复位信号。 4. 具有内部电流驱动级，段电流不小于20mA，字电流不小于100mA。 5. 支持各种显示控制功能，如左/右移动、闪烁控制、亮度控制以及段或LED的独立控制。 6. 提供数码管段数据的非译码或BCD译码选项，以及用于特殊字符的自定义BCD码。 7. 可以独立控制每个数码管的闪烁，并通过占空比设置提供16级亮度控制。 8. 支持1到8个数码管的扫描限制，仅为活动数码管分配扫描时间。 9. 可以驱动共阳数码管并扫描多达64个键盘按键.

The two interface options for exchanging data with the CH452 chip are the 4-wire serial interface and the 2-wire serial interface. The 4-wire serial interface supports multiple chips cascaded together, with a clock speed ranging from 0 to 2MHz, and it is compatible with the CH451 chip. On the other hand, the 2-wire serial interface supports two CH452 chips connected in parallel, with a clock speed of 400KHz, and it is also compatible with the I2C bus, saving pins.

The CH452 chip can drive up to 64 LEDs for dynamic display scanning control.