ATXMEGA8E5 datasheet(45/153 Pages) MICROCHIP

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Data Sheet Complete

DS40002059A-page 45

ATxmega32E5/16E5/8E5

20. Fault Extension

20.1 Features

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Connected to timer/counter output and waveform extension input

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Event controlled fault protection for instant and predictable fault triggering

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Fast, synchronous and asynchronous fault triggering

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Flexible configuration with multiple fault sources

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Recoverable fault modes

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Restart or halt the timer/counter on fault condition

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Timer/counter input capture on fault condition

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Waveform output active time reduction on fault condition

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Non-recoverable faults

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Waveform output is forced to a pre-configured safe state on fault condition

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Optional fuse output value configuration defining the output state during system reset

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Flexible fault filter selections

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Digital filter to prevent false triggers from I/O pin glitches

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Fault blanking to prevent false triggers during commutation

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Fault input qualification to filter the fault input during the inactive output compare states

20.2 Overview

The fault extension enables event controlled fault protection by acting directly on the generated waveforms from timer/

counter compare outputs. It can be used to trigger two types of faults with the following actions:

• Recoverable faults: the timer/counter can be restarted or halted as long as the fault condition is preset. The compare

output pulse active time can be reduced as long as the fault condition is preset. This is typically used for current sensing

regulation, zero crossing re-triggering, demagnetization re-triggering, and so on.

• Non-recoverable faults: the compare outputs are forced to a safe and pre-configured values that are safe for the

application. This is typically used for instant and predictable shut down and to disable the high current or voltage drivers.

Events are used to trigger a fault condition. One or several simultaneous events are supported, both synchronously or

asynchronously. By default, the fault extension supports asynchronous event operation, ensuring predictable and instant

fault reaction, including system power modes where the system clock is stopped.

By using the input blanking, the fault input qualification or digital filter option in event system, the fault sources can be fil-

tered to avoid false faults detection.

There are two fault extensions, one for each of the timer/counter 4 and timer/counter 5 on PORTC. The notation of these

are FAULTC4 and FAULTC5, respectively.

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