DSPIC30F4012 datasheet(201/238 Pages) MICROCHIP

201 / 238 page

DS70135G-page 201

dsPIC30F4011/4012

FIGURE 24-14:

QEA/QEB INPUT CHARACTERISTICS

TQ30

TQ35

TQ31

QEA

(input)

TQ35

QEB

(input)

TQ36

QEB

Internal

TQ40

TQ41

TQ30

TQ31

TABLE 24-30: QUADRATURE DECODER TIMING REQUIREMENTS

AC CHARACTERISTICS

Standard Operating Conditions: 2.5V to 5.5V

(unless otherwise stated)

Operating temperature

-40°C

≤TA ≤+85°C for Industrial

-40°C

≤TA ≤+125°C for Extended

Param

No.

Symbol

Characteristic(1)

Typ(2)

Max

Units

Conditions

TQ30

TQUL

Quadrature Input Low Time

6 TCY

—ns

TQ31

TQUH

Quadrature Input High Time

6 TCY

—ns

TQ35

TQUIN

Quadrature Input Period

12 TCY

—ns

TQ36

TQUP

Quadrature Phase Period

3 TCY

—ns

TQ40

TQUFL

Filter Time to Recognize Low,

with Digital Filter

3 * N * TCY

—

N = 1, 2, 4, 16, 32, 64, 128

and 256 (Note 2)

TQ41

TQUFH

Filter Time to Recognize High,

with Digital Filter

3 * N * TCY

—

N = 1, 2, 4, 16, 32, 64, 128

and 256 (Note 2)

Note 1:

These parameters are characterized but not tested in manufacturing.

N = Index Channel Digital Filter Clock Divide Select bits. Refer to Section 16. “Quadrature Encoder

Interface (QEI)” in the “dsPIC30F Family Reference Manual” (DS70046).

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