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Hi,
How do we select the resistor and zener as shown in the image above. What purpose does it solve?
The reference schematic TIDA-01617 shows resistor network with common zener. Is it okay to use common zener?
Hi Akash,
The pull-down circuit consisted by resistor and Zener is used for ghost cancellation. For LED matrix, ghost issue happens due to parasitic capacitance on every switch line. So that a pull-down path is needed to discharge the parasitic capacitor when the switch line is open. It is OK to use a common Zener.