MAX7219 is a high-performance eight-bit serial interface LED driver chip. This article mainly introduces its internal structure, application points and programming method with AT89C2051 serial interface. Keywords: MAX7219 LED display serial driver AT89C2051 power-saving operation brightness control MAX7219 is a high-performance eight-bit serial interface LED display driver chip, using common cathode dynamic scanning mode. Its peak segment current can reach 40mA, the highest serial clock rate is 10MHz, and the typical scanning rate is 1300Hz (V + = 5V, eight-bit scanning). As the serial interface of the MCS251 series microcontroller, it only occupies 3 I/O lines. Except for the peak segment current setting resistor RSET, no other external components are required to drive the eight-bit common cathode LED display. Compared with other eight-bit LED display driver chips (such as ICM7218), the comprehensive performance indicators are much higher. In particular, when working in the shutdown mode, not only can the microcontroller still transmit data and modify the control mode, but the chip consumes only 150μA, so the LED display can be used in battery-powered portable instruments. If the retail price drops below 30 yuan (currently 49 yuan), the chip will be widely used in various industries in China.
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