Microchip Technology MA330031-2 Data Sheet
2011-2013 Microchip Technology Inc.
DS70000657H-page 425
dsPIC33EPXXXGP50X, dsPIC33EPXXXMC20X/50X AND PIC24EPXXXGP/MC20X
FIGURE 30-13:
QEI MODULE INDEX PULSE TIMING CHARACTERISTICS
(dsPIC33EPXXXMC20X/50X and PIC24EPXXXMC20X DEVICES ONLY)
(dsPIC33EPXXXMC20X/50X and PIC24EPXXXMC20X DEVICES ONLY)
QEA
(input)
QEB
(input)
Ungated
Index
Index Internal
Position Counter
Reset
TQ51
TQ50
TQ55
TABLE 30-32: QEI INDEX PULSE TIMING REQUIREMENTS
(dsPIC33EPXXXMC20X/50X and PIC24EPXXXMC20X DEVICES ONLY)
AC CHARACTERISTICS
Standard Operating Conditions: 3.0V to 3.6V
(unless otherwise stated)
Operating temperature
(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
Min.
Max.
Units
Conditions
TQ50
TqiL
Filter Time to Recognize Low,
with Digital Filter
with Digital Filter
3 * N * T
CY
—
ns
N = 1, 2, 4, 16, 32, 64,
128 and 256 (Note
128 and 256 (Note
TQ51
TqiH
Filter Time to Recognize High,
with Digital Filter
with Digital Filter
3 * N * T
CY
—
ns
N = 1, 2, 4, 16, 32, 64,
128 and 256 (Note
128 and 256 (Note
TQ55
Tqidxr
Index Pulse Recognized to Position
Counter Reset (ungated index)
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 QEA and QEB is shown for position counter Reset timing only. Shown for
forward direction only (QEA leads QEB). Same timing applies for reverse direction (QEA lags QEB) but
index pulse recognition occurs on the falling edge.
forward direction only (QEA leads QEB). Same timing applies for reverse direction (QEA lags QEB) but
index pulse recognition occurs on the falling edge.