Datasheet

© 2010 Microchip Technology Inc. DS70135G-page 201
dsPIC30F4011/4012
FIGURE 24-14: QEA/QEB INPUT CHARACTERISTICS
TQ30
TQ35
TQ31
QEA
(input)
TQ35
QEB
(input)
TQ36
QEB
Internal
TQ40TQ41
TQ30
TQ31
TABLE 24-30: QUADRATURE DECODER TIMING REQUIREMENTS
AC CHARACTERISTICS
Standard Operating Conditions: 2.5V to 5.5V
(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 T
QUL 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 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 2)
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 2)
Note 1: These parameters are characterized but not tested in manufacturing.
2: N = Index Channel Digital Filter Clock Divide Select bits. Refer to Section 16. “Quadrature Encoder
Interface (QEI)” in the “dsPIC30F Family Reference Manual” (DS70046).