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If a segment does not light in display test mode this indicates a connection problem that should be investigated. Enable display test mode by writing 0x01 to register 0x07. Display test mode overrides, but does not alter, all control and digit registers and turns all segments on. Connection Scheme for Eight 16-Segment Digits DIGITĭisplay test mode can be used to verify connections after connecting the MAX6954 to 16-segment displays.

Segment labeling for 16-segment displays. MAX6954 16-segment application circuit.įigure 2. Figure 1 illustrates an eight digit, 16-segment application circuit for the MAX6954.įigure 1. The letters in Table 1 correspond to the segment labels shown in Figure 2. Table 1 lists the connection scheme for 16-segment digits that is compatible with the MAX6954 multiplex scheme and the built in 104-character font map. The technique is discussed in "Charlieplexing - Reduced Pin-Count LED Display Multiplexing". This differs from the standard LED multiplex connection, which uses separate driver pins for anodes and cathodes. The MAX6954 utilizes a multiplex technique that reduces driver pin count by using ports alternately as cathode and anode drivers. This application note guides the user through the process of connecting the MAX6954 to 16-segment displays and configuring the internal registers to control the displays using the included 104-character font map. "Quick-Start: Driving 7-Segment Displays with the MAX6954" and "Quick-Start: Driving 14-Segment Displays with the MAX6954" are similar application notes that discuss configuring the MAX6954 for 7-segment and 14-segment applications, respectively.Ī common application for the MAX6954 is driving up to eight 16-segment mono-color LEDs. See the MAX6954 data sheet for additional information about MAX6954 features. This application note shows a typical application and configuration for driving eight mono-color, 16-segment LEDs. The MAX6954 is a versatile display driver, capable of controlling a mix of discrete, 7-segment, 14-segment, and 16-segment LED displays through a serial interface. This article is how-to guide, intended as a quick learning aid for engineers considering using the MAX6954 to drive 16-segment monocolor LEDs.