Datasheet

© 2007-2012 Microchip Technology Inc. DS70291G-page 381
dsPIC33FJ32MC302/304, dsPIC33FJ64MCX02/X04 AND dsPIC33FJ128MCX02/X04
FIGURE 31-12: QEA/QEB INPUT CHARACTERISTICS
TQ30
TQ35
TQ31
QEA
(input)
TQ30
TQ35
TQ31
QEB
(input)
TQ36
QEB
Internal
TQ40TQ41
TABLE 31-30: 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 T
QUH Quadrature Input High Time 6 TCY —ns —
TQ35 T
QUIN Quadrature Input Period 12 TCY —ns —
TQ36 TQUP Quadrature Phase Period 3 TCY —ns —
TQ40 T
QUFL Filter Time to Recognize Low,
with Digital Filter
3 * N * TCY — ns N = 1, 2, 4, 16, 32, 64,
128 and 256 (Note 3)
TQ41 T
QUFH Filter Time to Recognize High,
with Digital Filter
3 * N * TCY — ns N = 1, 2, 4, 16, 32, 64,
128 and 256 (Note 3)
Note 1: These parameters are characterized but not tested in manufacturing.
2: Data in “Typ” column is at 3.3V, 25°C unless otherwise stated. Parameters are for design guidance only
and are not tested.
3: N = Index Channel Digital Filter Clock Divide Select bits. Refer to Section 15. “Quadrature Encoder
Interface (QEI)” in the “dsPIC33F/PIC24H Family Reference Manual”. Please see the Microchip web site
for the latest dsPIC33F/PIC24H Family Reference Manual sections.