資料來源:https://www.sparkfun.com/products/9622
The MAX7219CNG is a compact, serial input/output common-cathode display driver that can interface microprocessors to 7-segment numeric LED displays of up to 8 digits, bar-graph displays, or 64 individual LEDs. Included on-chip are a BCD code-B decoder, multiplex scan circuitry, segment and digit drivers, and an 8x8 static RAM that stores each digit.
Communication with the MAX7219 is achieved through a convenient 4-wire serial interface (supports SPI). Individual digits may be addressed and updated without rewriting the entire display. Only one external resistor is required to set the segment current for all LEDs.
The IC also includes a 150μA low-power shutdown mode, analog and digital brightness control, a scanlimit register that allows the user to display from 1 to 8 digits, and a test mode that forces all LEDs on.
This device comes in a 24-pin DIP package.
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該MAX7219CNG是可以連接微處理器7段數字緊湊型,串行輸入/輸出共陰極顯示驅動LED的高達8位數,條形圖顯示器或64個獨立的LED顯示器。包括片上是BCD碼-B解碼器,复用掃描電路,段和數字驅動器,以及存儲每一個數字一個8x8的靜態RAM。
與MAX7219的通信是通過方便的4線串行接口(支持SPI)來實現的。單個數字可尋址和刷新無需重寫整個顯示器。只有一個外部電阻需要設置段電流對於所有的LED。
該IC還包括一個150μA低功耗關斷模式中,模擬和數字亮度控制,一個scanlimit寄存器,允許用戶從1到8位數字顯示,這迫使所有LED的測試模式。
該器件採用24引腳DIP封裝。
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