Datasheet

dsPIC30F3010/3011
DS70141F-page 192 © 2010 Microchip Technology Inc.
FIGURE 23-14: QEA/QEB INPUT CHARACTERISTICS
TABLE 23-30: 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 ≤ T
A ≤ +125°C for Extended
Param
No.
Symbol Characteristic
(1)
Typ
(2)
Max Units Conditions
TQ30 TQUL 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).
TQ30
TQ35
TQ31
QEA
(input)
TQ30
TQ35
TQ31
QEB
(input)
TQ36
QEB
Internal
TQ40TQ41