Microchip Technology MA330027 Data Sheet
2009-2012 Microchip Technology Inc.
DS70616G-page 525
dsPIC33EPXXX(GP/MC/MU)806/810/814 and PIC24EPXXX(GP/GU)810/814
FIGURE 32-14:
QEI MODULE INDEX PULSE TIMING CHARACTERISTICS
(dsPIC33EPXXX(MC/MU)806/810/814 DEVICES ONLY)
(dsPIC33EPXXX(MC/MU)806/810/814 DEVICES ONLY)
QEA
(input)
(input)
Ungated
Index
Index
QEB
(input)
(input)
TQ55
Index Internal
Position Counter
Reset
Reset
TQ50
TQ51
TABLE 32-32: QEI INDEX PULSE TIMING REQUIREMENTS
(dsPIC33EPXXX(MC/MU)MU806/810/814 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. 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.
index pulse recognition occurs on the falling edge.