70291E Datasheet, PDF (367/436 Pages) Microchip Technology – High-Performance, 16-bit Digital Signal Controllers

dsPIC33FJ32MC302/304, dsPIC33FJ64MCX02/X04 AND dsPIC33FJ128MCX02/X04
FIGURE 31-13:
QEA
(input)
QEI MODULE INDEX PULSE TIMING CHARACTERISTICS
QEB
(input)
Ungated
Index
Index Internal
TQ51
Position Counter
Reset
TQ50
TQ55
TABLE 31-31: QEI 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 ≤ TA ≤ +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 * TCY —
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 * TCY —
ns N = 1, 2, 4, 16, 32, 64,
128 and 256 (Note 2)
TQ55 Tqidxr Index Pulse Recognized to Position
3 TCY
—
ns
—
Counter Reset (ungated index)
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 falling edge.
© 2011 Microchip Technology Inc.
DS70291E-page 367