DSPIC33FJ12MC202 Microchip Technology Inc., DSPIC33FJ12MC202 Datasheet - Page 253

• Manufacturer Part Number: DSPIC33FJ12MC202
• Description: High-performance, 16-bit Digital Signal Controllers
• Manufacturer: Microchip Technology Inc.

FIGURE 23-13:
TABLE 23-31: QEI INDEX PULSE TIMING REQUIREMENTS
© 2007 Microchip Technology Inc.
AC CHARACTERISTICS
TQ50
TQ51
TQ55
Note 1:
Param
No.
2:
QEA
(input)
QEB
(input)
Ungated
Index
Index Internal
Position
Counter 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
dsPIC33FJ12MC201/202
3 * N * T
3 * N * T
3 T
Min
CY
CY
CY
TQ50
-40°C ≤ T
-40°C ≤ T
Max
—
—
—
A
A
≤ +125°C for Extended
≤ +85°C for Industrial
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)
Conditions
DS70265B-page 251
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