Datasheet

dsPIC33FJ12MC201/202
DS70265E-page 246 © 2007-2011 Microchip Technology Inc.
FIGURE 24-13: QEI MODULE INDEX PULSE TIMING CHARACTERISTICS
TABLE 24-30: QUADRATURE DECODER TIMING REQUIREMENTS
AC CHARACTERISTICS
Standard Operating Conditions: 3.0V to 3.6V
(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 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 TQUFL 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 by similarity, but are 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)” (DS70208) in the dsPIC33F/PIC24H Family Reference Manual. Please see the
Microchip (www.microchip.com) web site for the latest family reference manual chapters.
QEA
(input)
Ungated
Index
QEB
(input)
TQ55
Index Internal
Position Coun-
ter Reset
TQ50
TQ51