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AS1109-BSOU Datasheet(PDF) 11 Page - ams AG |
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AS1109-BSOU Datasheet(HTML) 11 Page - ams AG |
11 / 25 page www.ams.com/LED-Driver-ICs/AS1109 Revision 1.21 10 - 24 AS1109 Datasheet - Detailed Descr i p ti on Figure 14. Switching Global Error Mode Timing Diagram 8.3 Error-Detection Mode Acquisition of the error status occurs at the rising edge of OEN. Error-detection mode is started on the rising edge of LD when OEN is high. The CLK signal must be low when entering error detection mode. Error detection for open- and shorted-LEDs can only be performed for LEDs that are switched on during test time. To switch between error-detection modes clock pulses are needed (see Table 5). Note: To test all LEDs, a test pattern that turns on all LEDs must be input to the AS1109. 8.4 Global Error Mode Global error mode is entered when error-detection mode is started. Clock pulses during this period are used to select between temperature, open-LED, and shorted-LED tests, as well as low-current diagnostic mode and shutdown mode (see Table 5). In global error mode, an error flag (TFLAG, OFLAG, SFLAG) is delivered to pin SDO if any errors are encountered. Note: For a valid result SDI must be 1 for the first device. If there are multiple AS1109s in a chain, the error flag will be gated through all devices. To get a valid result at the end of the chain, a logic 1 must be applied to the SDI input of the first device of the chain. If one device produces an error this error will show up after n*tP(I/O) + tSW(ERROR) at pin SDO of the last device in the chain. This means it is not possible to identify which device in the chain produced the error. Therefore, if a global error occurs, the detailed error report can be run to identify which AS1109, or LED produced the error. Note: When no error has occurred, the detailed error report can be skipped, setting LD and subsequently OEN low. Table 5. Global Error Mode Selections Clock Pulses Output Port Error-Detection Mode Global Error Flag/Shutdown Condition 0 Don't Care Over-Temperature Detection TFLAG = SDO = 1: No over-temperature warning. TFLAG = SDO = 0: Over-temperature warning. 1 Enabled Open-LED Detection OFLAG = SDO = 1: No open-LED error. OFLAG = SDO = 0: Open-LED error. 2 Enabled Shorted-LED Detection SFLAG = SDO = 1: No shorted-LED error. SFLAG = SDO = 0: Shorted-LED error. 3 Don't Care Low-Current Diagnostic Mode 4 Don't Care Shutdown Mode SDI = 1: Wakeup SDI = 0: Shutdown tTESTING tSU(ERROR) OFLAG(IN) SFLAG(IN) TFLAG(IN) TFLAG OFLAG SFLAG tSW(ERROR) SDI OEN LD CLK SDO Acquisition of Error Status Don’t Care Don’t Care tGSW(ERROR) tP(I/O) tP4 tP(I/O) tP(I/O) tSW(ERROR) tGSW(ERROR) tGSW(ERROR) Don’t Care |
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