Microchip Technology MA330031-2 Data Sheet
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)
(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
(unless otherwise stated)
Operating temperature
-40°C
T
A
+85°C for Industrial
-40°C
T
A
+125°C for Extended
Param
No.
Symbol
Characteristic
(
)
Typ.
Max.
Units
Conditions
TQ30
T
QU
L
Quadrature Input Low Time
6 T
CY
—
ns
TQ31
T
QU
H
Quadrature Input High Time
6 T
CY
—
ns
TQ35
T
QU
IN
Quadrature Input Period
12 T
CY
—
ns
TQ36
T
QU
P
Quadrature Phase Period
3 T
CY
—
ns
TQ40
T
QUF
L
Filter Time to Recognize Low,
with Digital Filter
with Digital Filter
3 * N * T
CY
—
ns
N = 1, 2, 4, 16, 32, 64, 128
and 256 (Note
and 256 (Note
)
TQ41
T
QUF
H
Filter Time to Recognize High,
with Digital Filter
with Digital Filter
3 * N * T
CY
—
ns
N = 1, 2, 4, 16, 32, 64, 128
and 256 (Note
and 256 (Note
)
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.
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.
(DS70601) in the “dsPIC33/PIC24 Family Reference Manual”. Please see the Microchip web site for the
latest family reference manual sections.