AM1808AZCED3 datasheet(231/264 Pages) TI

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AM1808

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SPRS653A – FEBRUARY 2010 – REVISED APRIL 2010

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.

Peripheral Information and Electrical Specifications

231

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AM1808AZCED3 Datasheet(PDF) 231 Page - Texas Instruments