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AS8506 Datasheet(PDF) 32 Page - ams AG |
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AS8506 Datasheet(HTML) 32 Page - ams AG |
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32 / 89 page  AS8506 – 32 ams Datasheet, Confidential:2013-Sep [1-00] De tail ed De sc rip t ion Wake-up Event The AS8506 device comes out of SLEEP mode by a wake pulse on the WAKE_IN pin. To avoid false wake by noises on the WAKE_IN, the wake signal (Low pulse) is taken through a low-pass filter from WAKE_IN pin. When a pulse of width Twake_pulse is given on the WAKE_IN by the microcontroller, the device wakes up and enters into WAKE mode. The low-pass filter discards all signals having width less than Tfilter_min and allows all signals with width greater than Tfilter_max. The filter is uncertain in Tuncertain region. The negative edge which is passing through the filter will wake the device from SLEEP mode. In chain of AS8506 devices, to propagate the negative edge the microcontroller has to give minimum low pulse of width Twake_pulse. Before entering into SLEEP mode the wake pin must be ‘High’. Figure 26: WAKE-UP Signaling WAKE_IN wake_in_fltrd Tfilter_min Tfilter_max Tuncertain Tuncertain Twake_pulse Tfilter_delay |
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