DSPIC33FJ64GS406 datasheet(411/456 Pages) MICROCHIP

411 / 456 page

 2009-2012 Microchip Technology Inc.

DS70591E-page 411

dsPIC33FJ32GS406/606/608/610 and dsPIC33FJ64GS406/606/608/610

FIGURE 27-26:

TIMERQ (QEI MODULE) EXTERNAL CLOCK TIMING CHARACTERISTICS

TABLE 27-46: 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.

2: 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 the falling edge.

TQ11

TQ15

TQ10

TQ20

QEB

POSCNT

TABLE 27-47: QEI MODULE EXTERNAL CLOCK 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

Typ

Max

Units

Conditions

TQ10

TtQH

TQCK High Time

Synchronous,

with prescaler

TCY + 20

—

Must also meet

Parameter TQ15

TQ11

TtQL

TQCK Low Time

Synchronous,

with prescaler

TCY + 20

—

Must also meet

Parameter TQ15

TQ15

TtQP

TQCP Input

Period

Synchronous,

with prescaler

2 * TCY + 40

—

TQ20

TCKEXTMRL Delay from External TxCK Clock

Edge to Timer Increment

0.5 TCY

—

1.5 TCY

—

Note 1: These parameters are characterized but not tested in manufacturing.

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