Datasheet

dsPIC33EPXXXGM3XX/6XX/7XX
DS70000689D-page 458  2013-2014 Microchip Technology Inc.
FIGURE 33-14: QEIx MODULE INDEX PULSE TIMING CHARACTERISTICS
QEAx
(input)
Ungated
Index
QEBx
(input)
TQ55
Index Internal
Position
Counter Reset
TQ50
TQ51
TABLE 33-31: QEIx INDEX PULSE 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)
Min. Max. Units Conditions
TQ50 TqIL Filter Time to Recognize Low
with Digital Filter
3 * N * T
CY — ns N = 1, 2, 4, 16, 32, 64,
128 and 256 (Note 2)
TQ51 TqiH Filter Time to Recognize High
with Digital Filter
3 * N * T
CY — ns N = 1, 2, 4, 16, 32, 64,
128 and 256 (Note 2)
TQ55 Tqidxr Index Pulse Recognized to Position
Counter Reset (ungated index)
3 T
CY —ns
Note 1: These parameters are characterized but not tested in manufacturing.
2: Alignment of index pulses to QEAx and QEBx is shown for Position Counter Reset timing only. Shown for
forward direction only (QEAx leads QEBx). Same timing applies for reverse direction (QEAx lags QEBx)
but index pulse recognition occurs on falling edge.