dspic33fj128mc204 Microchip Technology Inc., dspic33fj128mc204 Datasheet - Page 363

• Manufacturer Part Number: dspic33fj128mc204
• Description: High-performance, 16-bit Digital Signal Controllers
• Manufacturer: Microchip Technology Inc.

FIGURE 31-13:
TABLE 31-31: QEI INDEX PULSE TIMING REQUIREMENTS
© 2009 Microchip Technology Inc.
AC CHARACTERISTICS
TQ50
TQ51
TQ55
Note 1:
Param
No.
2:
QEA
(input)
QEB
(input)
Ungated
Index
Index Internal
Position Coun-
ter Reset
TqIL
TqiH
Tqidxr
Symbol
These parameters are characterized but not tested in manufacturing.
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.
Filter Time to Recognize Low,
with Digital Filter
Filter Time to Recognize High,
with Digital Filter
Index Pulse Recognized to Position
Counter Reset (ungated index)
QEI MODULE INDEX PULSE TIMING CHARACTERISTICS
TQ51
Characteristic
(1)
Standard Operating Conditions: 3.0V to 3.6V
(unless otherwise stated)
Operating temperature
Preliminary
TQ55
3 * N * T
3 * N * T
3 T
Min
CY
CY
CY
TQ50
-40°C ≤ T
-40°C ≤ T
Max
—
—
—
A
A
≤ +85°C for Industrial
≤ +125°C for Extended
Units
ns
ns
ns
N = 1, 2, 4, 16, 32, 64,
128 and 256 (Note 2)
N = 1, 2, 4, 16, 32, 64,
128 and 256 (Note 2)
DS70291C-page 361
Conditions
—