数码管驱动及键盘控制芯片CH452外文资料翻译.docVIP

外文资料原文 Digital Driving and keyboard control chip CH452 1. Overview CH452 digital control display driver and keyboard scan control chip. CH452 built-in clock oscillation circuit, dynamic driving control eight digital or 64 LED, BCD is decoding, scintillation, displacement, Dan addressable, the light beam decoding functions; It can also carry out 64 key keyboard scanning; CH452 can cascade through the four-lane or two serial interface Serial Line Interface and SCM to exchange data; and to be able to provide electricity MCU reset signal. 2.Features 2.1 Driver （1）Duilt-driven current level of the current is less than 15 MA .the current word is not less than 80 MA. （2）Dynamic display scanning control, direct-drive eight digital control, 64-LED light beam or 64. （3）BCD decoding support from the definition of a BCD, a show for special characters. （4）Digital data of the characters left, right side, left circle, right circle. （5）Arbitrary Dan addressable, the independent control of each LED or the digital control of all the bright and destruction. 2.2 Keyboard Control （1）built-in 64 key keyboard controller, based on the 8 × 8 matrix keyboard scanner. （2）Embedded keypad input state of the drop-down resistors, built to dither circuit. （3）Keyboard interrupt, we can choose effective low-level or low-level output pulse output. 2.3 External Interface （1）Same chip, the optional four-lane high-speed serial interface or economic lines two serial interface. （2）4 Serial Line Interface : Support for multiple cascading chip, the clock speed from 0 to 2 MHz, compatible LED chip. （3）2 Serial Line Interface : support two parallel chip CH452 (ADDR pin-level set their address). Functional Description 3.1 Driver CH452 of digital control and LED-driven dynamic scanning, to the order of DIG0 DIG7. When inhaled in which a pin current, the other pins are not current inhalation. CH452 internal drive with current levels, and can directly drive 0.5-inch to an inch of a total of Yam Dig