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AN3981 Datasheet(PDF) 21 Page - STMicroelectronics |
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AN3981 Datasheet(HTML) 21 Page - STMicroelectronics |
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21 / 54 page  AN3981 16-bit LED array drivers Doc ID 022217 Rev 1 21/54 Figure 21. Fault conditions detected by error detection mode: a) shorted LED; b) open LED; c) short-circuit from current generator to VLED; d) open channel; e) short-circuit from current generator to GND The diagnostic circuitry embedded in the STP16DPxy05 can detect these faulty conditions (in accordance with the detection thresholds of Table 3) and provide the results of the detection as an “Error status code” coming out of the SDO pin (see Figure 22), with “0” logic level indicating a faulty channel, whereas “1” logic level indicates a “good” channel. Figure 22. Error status code Table 3. Detection conditions Detection conditions Detection result IODEC (1) = 0.5·I O (2) 1. IODEC is the detected output current in detection mode. 2. IO is the programmed output current. Open channel or output short to GND detected IODEC = 0.5·IO No error detected VO = 2.4 V Short on LED or short to LED supply voltage VO = 2.2 V No error detected |
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