AN1292: Si5332-AM SmartClock™ Fault Detection and Monitoring
Automotive electronics system designs have traditionally depended on multiple pieces of quartz crystals and quartz crystal oscillators to provide timing references for all the required system clocks. One of the largest drawbacks to this approach is that quartz-based components have the highest FIT rates of any electronic systems component,which greatly affects system reliability. As designs continue to adopt processors with greater functionality with higher speed SerDes, Ethernet connectivity, and PCI-Express data buses, the need for more reference clocks arises, with both single-ended and differential formats, and lower RMS phase jitter.
The Si5332-AM family of clock generators is designed to overcome the challenges associated with increasingly complex clock tree design in automotive electronics. These devices are capable of supporting up to 12 unique frequency outputs, all of which can be individually programmed to its own electrical format (i.e., LVCMOS, LVDS, HCSL,etc.). By consolidating the functionality of many pieces of quartz-based components into a silicon-based clock generator, system designers can eliminate many points of failure and greatly improve overall system reliability.
In addition to component count reduction and reliability improvements, clock generators offer numerous additional benefits that are not available from quartz-based timing components.The Si5332-AM clock generators provide in-system programming capability,spread spectrum modulation, output enable control, and frequency selection capabilities. To help system designers meet system level safety goals, the Si5332-AM devices also come equipped with SmartClock features that include redundant reference inputs,health monitoring, fault detection, communication with an external safety manager, primary/back-up reference source switching,and Always ON outputs.This application note provides an overview of the SmartClock features and outlines system level examples on how to implement them.
●KEY POINTS:
■SmartClock features
■System implementation examples
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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2021/01/21 |
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Rev. 0.1 |
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AN1292 |
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633 KB |
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