AN874 MAXIM | Alldatasheet
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displays instead of regular single digit 7 segment displays. (MAX6950) or eight (MAX6951) digits (Table 1). Table 1. Standard Driver Connections to Single-Digit Displays
*These digits are not available for the MAX6950. (Figure 1) and these displays present issues. connections internally (Figure 1), effectively shorting Pin 5 and Pin 6 of the driver. Figure 1. Internal connections for a multiplex dual-digit display Two simple solutions are presented here. within the seven-segment digit. no-decode operation should not be selected when this (or any other nonstandard) pin mapping is used. the standard display connections are being used.
Table 2. Example Driver Connections to Dual-Digit Displays When No DPs Are Required *These digits are not available for the MAX6950. up to 8 discrete LEDs, to take place of each unused dp segment per digit. This is shown in Table 3. Table 3. Example Driver Connections to Dual-Digit Displays When No DPs Are Required, Plus 8
(cathode to CC0) CC1 SEG g SEG f SEG e SEG d SEG c SEG b SEG a LED Digit SEG f SEG g CC2 Discrete LED anode (cathode to CC3) SEG e SEG d SEG c SEG b SEG a LED Digit SEG f SEG g Discrete LED anode (cathode to CC2) CC3 SEG e SEG d SEG c SEG b SEG a LED Digit SEG d SEG g SEG f SEG e CC4 Discrete LED anode (cathode to CC5) SEG c SEG b SEG a LED Digit SEG d SEG g SEG f SEG e Discrete LED anode (cathode to CC4) CC5 SEG c SEG b SEG a LED Digit SEG b SEG g SEG f SEG e SEG d SEG c CC6 Discrete LED anode (cathode to CC7 ) SEG a LED Digit SEG b SEG g SEG f SEG e SEG d SEG c Discrete LED anode (cathode to CC6) CC7 SEG a *These digits are not available for the MAX6950. The second solution can be used if all digits' segments are required. This time, hexadecimal-decode operation can be selected because the standard segment connection pattern is used (Table 4). The penalty for this configuration is that one diode is required per digit (Figure 2). Each diode is passing only one segment's current, so it can be a low-cost single signal diode like 1N4148, BAS16 (silicon), or BAT54, BAR43 (Schottky). Better still, use surface mount dual common-cathode diodes like BAV70 (silicon) and BAT54C (Schottky). The minimum supply voltage to the MAX6950/MAX6951 must also be raised by the selected diode's forward voltage drop: typically 1.0V for a silicon signal diode or 0.4V for a Schottky signal diode at 50mA.
SEG f SEG e SEG d SEG c CC6 Diode to SEG b of Digit 6 and Digit 7 SEG a LED Digit SEG dp SEG g SEG f SEG e SEG d SEG c Diode to SEG b of Digit 6 and Digit 7 CC7 SEG a *These digits are not available for the MAX6950. December 2001 More Information MAX6950: QuickView -- Full (PDF) Data Sheet -- Free Samples MAX6951: QuickView -- Full (PDF) Data Sheet -- Free Samples