Datasheet

dsPIC33EPXXX(GP/MC/MU)806/810/814 and PIC24EPXXX(GP/GU)810/814
DS70616G-page 524  2009-2012 Microchip Technology Inc.
FIGURE 32-13: QEA/QEB INPUT CHARACTERISTICS
(dsPIC33EPXXX(MC/MU)806/810/814 DEVICES ONLY)
TQ30
TQ35
QEA
(input)
TQ35
QEB
(input)
TQ36
QEB
Internal
TQ40TQ41
TQ31
TQ31
TQ30
TABLE 32-31: QUADRATURE DECODER TIMING REQUIREMENTS
(dsPIC33EPXXX(MC/MU)806/810/814 DEVICES ONLY)
AC CHARACTERISTICS
Standard Operating Conditions: 3.0V to 3.6V
(unless otherwise stated)
Operating temperature -40°C  T
A  +85°C for Industrial
-40°C  T
A  +125°C for Extended
Param. 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 T
QUP 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)” (DS70601) in the “dsPIC33E/PIC24E Family Reference Manual”. Please see the
Microchip web site for the latest family reference manual sections.