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AN3981 Datasheet(PDF) 49 Page - STMicroelectronics |
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AN3981 Datasheet(HTML) 49 Page - STMicroelectronics |
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49 / 54 page  AN3981 Common application information Doc ID 022217 Rev 1 49/54 Figure 59. LED matrix panel driving solution Eight channels out of sixteen are connected to the common cathodes (8 cathodes per channel) and, if turned on, sink current from 1 to 8 LEDs (according to the number of LEDs activated in each column). The remaining channels are dedicated to driving the base of 8 transistors (used as switches), each one used to connect or not eight anodes (of the same row) to the LED voltage rail (if any, or to VCC if the voltage supply is the same as that which sources the IC). The timing diagram in Figure 60 shows how to send data properly in order to correctly display the desired information. Each 16-bit group is used to select the row (bit 15 to bit 8) and the column (bit 7 to bit 0) of the matrix. The complete image, considering a matrix of 8x8, is built in 8 cycles. Each cycle is used to select a row (activating more columns) or a column (activating more rows). |
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