DSPIC33FJ12MC02ESS datasheet(252/284 Pages) MICROCHIP

252 / 284 page

dsPIC33FJ12MC201/202

DS70265B-page 250

Preliminary

FIGURE 23-12:

QEA/QEB INPUT CHARACTERISTICS

TQ30

TQ35

TQ31

QEA

(input)

TQ30

TQ35

TQ31

QEB

(input)

TQ36

QEB

Internal

TQ40

TQ41

TABLE 23-30: QUADRATURE DECODER TIMING REQUIREMENTS

AC CHARACTERISTICS

Standard Operating Conditions: 3.0V to 3.6V

(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 3)

TQ41

TQUFH

Filter Time to Recognize High,

with Digital Filter

3 * N * TCY

—

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

128 and 256 (Note 3)

Note 1:

These parameters are characterized but not tested in manufacturing.

Data in “Typ” column is at 3.3V, 25°C unless otherwise stated. Parameters are for design guidance only

and are not tested.

N = Index Channel Digital Filter Clock Divide Select bits. Refer to Section 15. “Quadrature Encoder

Interface (QEI)” in the “dsPIC33F Family Reference Manual”. Please see the Microchip

(www.microchip.com) web site for the latest dsPIC33F Family Reference Manual chapters.

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