Datasheet

TMS320F28069, TMS320F28068, TMS320F28067, TMS320F28066
TMS320F28065, TMS320F28064, TMS320F28063, TMS320F28062
SPRS698D –NOVEMBER 2010–REVISED DECEMBER 2012 www.ti.com
5.21.1 Enhanced Quadrature Encoder (eQEP) Electrical Data/Timing
Table 5-62 shows the eQEP timing requirement and Table 5-63 shows the eQEP switching
characteristics.
Table 5-62. Enhanced Quadrature Encoder Pulse (eQEP) Timing Requirements
(1)
MIN MAX UNIT
t
w(QEPP)
QEP input period Asynchronous
(2)
/Synchronous 2t
c(SCO)
cycles
With input qualifier 2[1t
c(SCO)
+ t
w(IQSW)
] cycles
t
w(INDEXH)
QEP Index Input High time Asynchronous
(2)
/Synchronous 2t
c(SCO)
cycles
With input qualifier 2t
c(SCO)
+t
w(IQSW)
cycles
t
w(INDEXL)
QEP Index Input Low time Asynchronous
(2)
/Synchronous 2t
c(SCO)
cycles
With input qualifier 2t
c(SCO)
+ t
w(IQSW)
cycles
t
w(STROBH)
QEP Strobe High time Asynchronous
(2)
/Synchronous 2t
c(SCO)
cycles
With input qualifier 2t
c(SCO)
+ t
w(IQSW)
cycles
t
w(STROBL)
QEP Strobe Input Low time Asynchronous
(2)
/Synchronous 2t
c(SCO)
cycles
With input qualifier 2t
c(SCO)
+t
w(IQSW)
cycles
(1) For an explanation of the input qualifier parameters, see Table 5-69.
(2) Refer to the TMS320F28069, TMS320F28068, TMS320F28067, TMS320F28066, TMS320F28065, TMS320F28064, TMS320F28063,
TMS320F28062 Piccolo MCU Silicon Errata (literature number SPRZ342) for limitations in the asynchronous mode.
Table 5-63. eQEP Switching Characteristics
over recommended operating conditions (unless otherwise noted)
PARAMETER MIN MAX UNIT
t
d(CNTR)xin
Delay time, external clock to counter increment 4t
c(SCO)
cycles
t
d(PCS-OUT)QEP
Delay time, QEP input edge to position compare sync output 6t
c(SCO)
cycles
140 Peripheral and Electrical Specifications Copyright © 2010–2012, Texas Instruments Incorporated
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