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ZIOL2102 Datasheet(PDF) 56 Page - List of Unclassifed Manufacturers |
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ZIOL2102 Datasheet(HTML) 56 Page - List of Unclassifed Manufacturers |
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56 / 91 page  ZIOL2xxx – IC Family IO-Link compliant HV Line Driver IC Family Data Sheet January 31, 2012 © 2012 Zentrum Mikroelektronik Dresden AG — Rev. 2.2.1 All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. The information furnished in this publication is PRELIMINARY and subject to changes without notice. 56 of 90 3.5. The Power Fail Detector 3.5.1. Overview The Power-Fail detector function is split into two tasks. The first task is the “Line-Fault” (LF) detection which shall recognize a situation in which the ZIOL2xxx is not powered regularly. This situation can happen if for instance the wiring between device and host port is not performed in the right way (interchanged wires, broken wires). The second task is the “Under-Voltage” (UV) detector which monitors the supply voltage at the VDD pin of the ZIOL2xxx. The purpose of this detector is ensure a proper working of the HV drivers COM and AUX which is not guaranteed if the supply voltage at VDD drops below the allowed minimum value. Figure 3.20 illustrated the working principle of both the LF and the UV detector in combination with the further processing to the detected events (LINE_FAULT and UNDER_VOLTAGE). Based on the IC configuration (LF_ENABLE, UV_ENABLE flags) each event (or both events) may activate the lock for both channels exactly for the period the respective event is present. The new status register [26] allows diagnosing what event is present or was present in the past. Figure 3.20 PFD Working Principle 3.5.2. Line-Fault Detector The Line-Fault (LF) detection feature assumes the utilization of both channels in device mode. In the case one channel is used only, the number of detectable failures be reduced accordingly. For more information about detectable failures, please refer to the Appendix C. The optional (configurable) detection of the situation of an abnormal power supply of the IC will be achieved by a ratiometric working voltage sensor. As sensor input works the PFD pin (formerly M_EN) in combination with two |
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