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AN3981 数据表(PDF) 23 Page - STMicroelectronics |
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AN3981 数据表(HTML) 23 Page - STMicroelectronics |
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23 / 54 page  AN3981 16-bit LED array drivers Doc ID 022217 Rev 1 23/54 Figure 25. Example of error detection with OUT15 and OUT0 faulty and all other outputs good 3.6.1 Correctness of the error detection results It is important to underline that the result of the diagnostic process must be compared with the data loaded into the shift register. In fact, if a channel is not switched on, the result of the detection is “0” anyway. It is recommended to follow the approach shown in Figure 26. Figure 26. Error detection results interpretation The correct interpretation of the detection results can be affected by any setup/hold time problem. Same considerations about and LE timing done in Section 4.6.3 apply also to 16-bit LED array drivers. Incorrect error detection results can be due also to an inappropriate choice of the LED supply voltage. The rules to suitably define the LED supply voltage are discussed in Section 5.1. OE |
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