Routing IS31s to ESP32 Bus

flux

0:39

Below is a schematic update proposal for adding a fully routed 16ร—9 LED matrix to U1. This example assumes a common anode configuration; if you require a common cathode arrangement, the LED orientation and resistor placement should be inverted accordingly.
Schematic Update Proposal:
  1. Matrix Organization:
    • Matrix Dimensions: 16 columns ร— 9 rows = 144 LEDs.
    • Net Definitions:
      • Define 16 column nets (e.g., COL1 to COL16) to be driven by dedicated LED driver outputs.
      • Define 9 row nets (e.g., ROW1 to ROW9) to be controlled by the remaining LED driver channels.
  2. LED and Series Resistor Placement (Common Anode Example):
    • LED Selection: Use an SMD LED from the Flux library (for example, LED 0603 (1608 Metric)).
    • Resistor Selection: Use a currentโ€“limiting resistor (e.g., 330ฮฉ; you may adjust this based on your LED datasheet and operating voltage). Use a resistor from the Flux library (for example, Resistor).
    • Wiring:
      • LED Anode: Connect the anode of each LED directly to the corresponding column net (e.g., one column net from U1โ€™s output channels).
      • LED Cathode: Connect the LED cathode to one end of its series resistor.
      • Resistor Other End: Connect the other end of the resistor to the corresponding row net.
    • Labeling: Clearly indicate the channel assignment (e.g., Column 1, Row 1 corresponds to LED(1,1)).
  3. Driver Output Connections (U1):
    • Column Routing: Route 16 output channels from U1 to the 16 column nets (COL1โ€“COL16).
    • Row Routing: Route 9 output channels from U1 to the 9 row nets (ROW1โ€“ROW9).
    • Channel Assignment: Follow the chipโ€™s datasheet guidelines to assign the outputs correctly to columns and rows. Ensure that each LED channelโ€™s electrical characteristics (current drive levels, voltage drop, etc.) are respected.
  4. Additional Considerations:
    • Datasheet Guidelines: Verify the electrical specifications and channel assignment from the IS31FL3731 datasheet to ensure that the matrix wiring (common anode vs. common cathode) and resistor values are in compliance.
    • Decoupling & Grounding: Ensure that all Ground connections are made and that proper decoupling capacitors are added at the power pins of U1.
    • Schematic Organization: Consider using hierarchical sheets or replication features (if supported) due to the large number of LED-resistor pairs.
You can use the "Apply changes" button to incorporate these schematic updates into your project. If you need further adjustments (resistor value changes, common cathode wiring, or different driver output assignments), please let me know.
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LED3
LED4
LED2
R1
Resistance
330 ฮฉ
 

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