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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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L9800 데이터시트(PDF) 38 Page - STMicroelectronics |
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L9800 데이터시트(HTML) 38 Page - STMicroelectronics |
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38 / 55 page  10 Limp-home mode The limp is intended to handle limited functionality of the device in critical faulty situations. A typical application scenario is reported in the Figure 28, with a system, which is reconfigured during the limp- home as shown in the Figure 29. If the microcontroller that controls the device fails, an external safety microcontroller takes over controlling parallel inputs IN0 and IN1. The SBC forces the IDLE signal low, which brings the device in limp home. Once the switching activity on IN0, IN1 is over, being the IDLE pin still de- asserted, the device reaches sleep mode. During this mode active, the L9800 is only capable of driving two outputs that is, OUT2 through IN0 and OUT3 through IN1; such a mapping is fixed and overcomes an eventual different mapping programmed via SPI once the limp-home is reached. Figure 28. Possible system configuration during normal operating conditions OUT1D OUT2D OUT3D OUT4D OUT5D OUT6D OUT7D OUT0D OUT07S OUT56S OUT34S OUT12S L9800 Limp-home mode DS14041 - Rev 2 page 38/55 |
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