ATXMEGA8E5_14 datasheet(39/147 Pages) ATMEL

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XMEGA E5 [DATASHEET]

Atmel-8153I–AVR-ATxmega8E5-ATxmega16E5-ATxmega32E5_Datasheet–08/2014

20.

Fault Extension

20.1

Features

Connected to timer/counter output and waveform extension input

Event controlled fault protection for instant and predictable fault triggering

Fast, synchronous and asynchronous fault triggering

Flexible configuration with multiple fault sources

Recoverable fault modes

Restart or halt the timer/counter on fault condition

Timer/counter input capture on fault condition

Waveform output active time reduction on fault condition

Non-recoverable faults

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

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

Flexible fault filter selections

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

Fault blanking to prevent false triggers during commutation

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

filtered 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.

ATXMEGA8E5 датащи(PDF) 39 Page - ATMEL Corporation