Datasheet

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)
TQ30
TQ35
TQ31
QEB
(input)
TQ36
QEB
Internal
TQ40TQ41
AC CHARACTERISTICS
Standard Operating Conditions: 3.0V to 3.6V
(unless otherwise stated)
Operating temperature -40°C ≤ TA ≤ +85°C
Param
No.
Symbol Characteristic
(1)
Typ
(2)
Max Units Conditions
TQ30 T
QUL Quadrature Input Low Time 6 TCY —ns —
TQ31 TQUH 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 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 5V, 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 16. “Quadrature Encoder
Interface (QEI)” in the “dsPIC30F Family Reference Manual” (DS70046).