DSPIC33FJ12MC02ESS datasheet(253/284 Pages) MICROCHIP

253 / 284 page

Preliminary

DS70265B-page 251

dsPIC33FJ12MC201/202

FIGURE 23-13:

QEI MODULE INDEX PULSE TIMING CHARACTERISTICS

QEA

(input)

Ungated

Index

QEB

(input)

TQ55

Index Internal

Position

Counter Reset

TQ50

TQ51

TABLE 23-31: QEI INDEX PULSE 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)

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.

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