使用MAX7219/7221推动更高的电压或电流

摘要：技术扩增器MAX7219和MAX7221串行接口LED驱动器的电压和电流驱动能力。

Maxim > App Notes > DISPLAY DRIVERS

Keywords: LED display drivers, LED drivers, display drivers, SPI, serial, 7 segment, 7-segment Sep 09, 2002

APPLICATION NOTE 1196
Using the MAX7219/7221 to Drive Higher Voltage or Current

Abstract: Techniques to amplify the current and voltage drive capabilities of the MAX7219 and MAX7221 serial
interface LED drivers.


The MAX7219/7221 is an 8-digit, 7-segment common-cathode multiplexed LED display driver which drives up to
40mA segment current while operating from a 4V to 5.5V supply. This application note discusses how the
MAX7219/7221 can be used with external drive transistors for applications requiring higher peak segment
currents and/or a higher drive voltage. LEDs using three or more LED dice per segment cannot be driven directly
by the M