DSPIC30F2010 datasheet(77/204 Pages) MICROCHIP

77 / 204 page

DS70118H-page 77

dsPIC30F2010

13.0

QUADRATURE ENCODER

INTERFACE (QEI) MODULE

This section describes the Quadrature Encoder

Interface (QEI) module and associated operational

modes. The QEI module provides the interface to

incremental encoders for obtaining motor positioning

data. Incremental encoders are very useful in motor

control applications.

The Quadrature Encoder Interface (QEI) is a key

feature

requirement

for

several

motor

control

applications, such as Switched Reluctance (SR) and

AC Induction Motor (ACIM). The operational features of

the QEI are, but not limited to:

• Three input channels for two phase signals and

index pulse

• 16-bit up/down position counter

• Count direction status

• Position Measurement (x2 and x4) mode

• Programmable digital noise filters on inputs

• Alternate 16-bit Timer/Counter mode

• Quadrature Encoder Interface interrupts

These operating modes are determined by setting the

appropriate

bits

QEIM<2:0>

(QEICON<10:8>).

Figure 13-1 depicts the Quadrature Encoder Interface

block diagram.

FIGURE 13-1:

QUADRATURE ENCODER INTERFACE BLOCK DIAGRAM

Note:

This data sheet summarizes features of

this group of dsPIC30F devices and is not

intended to be a complete reference

source. For more information on the CPU,

peripherals,

descriptions

and

general device functionality, refer to the

“dsPIC30F Family Reference Manual”

(DS70046).

16-bit Up/Down Counter

Comparator/

Max Count Register

Quadrature

Programmable

Digital Filter

QEA

Programmable

Digital Filter

INDX

Encoder

Programmable

Digital Filter

QEB

Interface Logic

QEIM<2:0>

Mode Select

(POSCNT)

(MAXCNT)

QEIIF

Event

Flag

Reset

Equal

TCY

TQCS

TQCKPS<1:0>

1, 8, 64, 256

Prescaler

TQGATE

QEIM<2:0>

Synchronize

Det

Sleep Input

UPDN_SRC

QEICON<11>

Zero Detect

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