Datasheet

dsPIC33FJ32GS406/606/608/610 and dsPIC33FJ64GS406/606/608/610
DS70591E-page 410  2009-2012 Microchip Technology Inc.
FIGURE 27-25: QEI MODULE INDEX PULSE TIMING CHARACTERISTICS
TABLE 27-45: QUADRATURE DECODER TIMING REQUIREMENTS
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
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 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 TQUFH 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.
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”.
QEA
(input)
Ungated
Index
QEB
(input)
TQ55
Index Internal
Position Counter
Reset
TQ50
TQ51