Datasheet

dsPIC33EPXXXGP50X, dsPIC33EPXXXMC20X/50X AND PIC24EPXXXGP/MC20X
DS70000657H-page 424  2011-2013 Microchip Technology Inc.
FIGURE 30-12: QEA/QEB INPUT CHARACTERISTICS
(dsPIC33EPXXXMC20X/50X and PIC24EPXXXMC20X DEVICES ONLY)
QEA
(input)
QEB
(input)
TQ35
TQ30
TQ41 TQ40
TQ35
QEB
Internal
TQ36
TQ31
TQ31 TQ30
TABLE 30-31: QUADRATURE DECODER TIMING REQUIREMENTS
(dsPIC33EPXXXMC20X/50X and PIC24EPXXXMC20X DEVICES ONLY)
AC CHARACTERISTICS
Standard Operating Conditions: 3.0V to 3.6V
(unless otherwise stated)
Operating temperature -40°C  TA  +85°C for Industrial
-40°C  T
A  +125°C for Extended
Param
No.
Symbol Characteristic
(1)
Typ.
(2)
Max. Units Conditions
TQ30 T
QUL Quadrature Input Low Time 6 TCY —ns
TQ31 T
QUH Quadrature Input High Time 6 TCY —ns
TQ35 TQUIN 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 “Typical” 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 “Quadrature Encoder Interface (QEI)”
(DS70601) in the “dsPIC33/PIC24 Family Reference Manual”. Please see the Microchip web site for the
latest family reference manual sections.