DSPIC30F4012 datasheet(202/238 Pages) MICROCHIP

202 / 238 page

dsPIC30F4011/4012

DS70135G-page 202

FIGURE 24-15:

QEI MODULE INDEX PULSE TIMING CHARACTERISTICS

QEA

(input)

Ungated

Index

QEB

(input)

TQ55

Index Internal

Position Counter

Reset

TQ50

TQ51

TABLE 24-31: QEI INDEX PULSE 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)

Min

Max

Units

Conditions

TQ50

TqIL

Filter Time to Recognize Low,

with Digital Filter

3 * N * TCY

—

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

128 and 256 (Note 2)

TQ51

TqiH

Filter Time to Recognize High,

with Digital Filter

3 * N * TCY

—

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

128 and 256 (Note 2)

TQ55

Tqidxr

Index Pulse Recognized to Position

Counter Reset (ungated index)

3 TCY

—ns

Note 1:

These parameters are characterized but not tested in manufacturing.

Alignment of index pulses to QEA and QEB is shown for position counter Reset timing only. Shown for

forward direction only (QEA leads QEB). Same timing applies for reverse direction (QEA lags QEB) but

index pulse recognition occurs on falling edge.

DSPIC30F4012 Datasheet(PDF) 202 Page - Microchip Technology

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