Microchip Technology MA330011 Data Sheet
dsPIC33F
DS70165E-page 328
Preliminary
©
2007 Microchip Technology Inc.
FIGURE 26-12:
QEA/QEB INPUT CHARACTERISTICS
TABLE 26-29: QUADRATURE DECODER TIMING REQUIREMENTS
TQ30
TQ35
TQ31
QEA
(input)
(input)
TQ30
TQ35
TQ31
QEB
(input)
(input)
TQ36
QEB
Internal
Internal
TQ40
TQ41
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
Param
No.
Symbol
Characteristic
(1)
Typ
(2)
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 3)
128 and 256 (Note 3)
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 3)
128 and 256 (Note 3)
Note 1:
These parameters are characterized but not tested in manufacturing.
2:
Data in “Typ” column is at 5V, 25°C unless otherwise stated. Parameters are for design guidance only and
are not tested.
are not tested.
3:
N = Index Channel Digital Filter Clock Divide Select bits. Refer to Section 16. “Quadrature Encoder
Interface (QEI)” in the “dsPIC30F Family Reference Manual” (DS70046).
Interface (QEI)” in the “dsPIC30F Family Reference Manual” (DS70046).