Datasheet

AM1808

SPRS653E –FEBRUARY 2010–REVISED MARCH 2014

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6.28 Enhanced Capture (eCAP) Peripheral

The device contains up to three enhanced capture (eCAP) modules. Figure 6-76 shows a functional block

diagram of a module.

Uses for ECAP include:

• Speed measurements of rotating machinery (e.g. toothed sprockets sensed via Hall sensors)

• Elapsed time measurements between position sensor triggers

• Period and duty cycle measurements of pulse train signals

• Decoding current or voltage amplitude derived from duty cycle encoded current/voltage sensors

The ECAP module described in this specification includes the following features:

• 32 bit time base

• 4 event time-stamp registers (each 32 bits)

• Edge polarity selection for up to 4 sequenced time-stamp capture events

• Interrupt on either of the 4 events

• Single shot capture of up to 4 event time-stamps

• Continuous mode capture of time-stamps in a 4 deep circular buffer

• Absolute time-stamp capture

• Difference mode time-stamp capture

• All the above resources are dedicated to a single input pin

The eCAP modules are clocked at the ASYNC3 clock domain rate.

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