DSPIC30F4012 Microchip Technology Inc., DSPIC30F4012 Datasheet - Page 197
DSPIC30F4012
Manufacturer Part Number
DSPIC30F4012
Description
Dspic30f4011/4012 Enhanced Flash 16-bit Digital Signal Controller
Manufacturer
Microchip Technology Inc.
Datasheet
1.DSPIC30F4012.pdf
(236 pages)
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FIGURE 24-15:
TABLE 24-31: QEI INDEX PULSE TIMING REQUIREMENTS
© 2007 Microchip Technology Inc.
AC CHARACTERISTICS
TQ50
TQ51
TQ55
Note 1:
Param
No.
2:
Position Counter
TqIL
TqiH
Tqidxr
Symbol
Index Internal
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.
Ungated
(input)
(input)
Reset
Index
QEA
QEB
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
Characteristic
TQ51
(1)
Confidential
TQ55
Standard Operating Conditions: 2.5V to 5.5V
(unless otherwise stated)
Operating temperature -40°C ≤ T
3 * N * T
3 * N * T
3 T
Min
CY
CY
CY
dsPIC30F4011/4012
TQ50
Max
—
—
—
-40°C ≤ T
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)
A
A
≤ +85°C for Industrial
≤ +125°C for Extended
Conditions
DS70135E-page 195
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