Datasheet

TMS320F28335, TMS320F28334, TMS320F28332
TMS320F28235, TMS320F28234, TMS320F28232
www.ti.com SPRS439M –JUNE 2007–REVISED AUGUST 2012
6.10.5 Enhanced Quadrature Encoder Pulse (eQEP) Timing
Table 6-26 shows the eQEP timing requirement and Table 6-27 shows the eQEP switching
characteristics.
Table 6-26. Enhanced Quadrature Encoder Pulse (eQEP) Timing Requirements
(1)
TEST CONDITIONS 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 6-13.
(2) Refer to the TMS320F28335, TMS320F28334, TMS320F28332, TMS320F28235, TMS320F28234, TMS320F28232 DSC Silicon Errata
(literature number SPRZ272) for limitations in the asynchronous mode.
Table 6-27. eQEP Switching Characteristics
PARAMETER TEST CONDITIONS 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 6t
c(SCO)
cycles
output
Copyright © 2007–2012, Texas Instruments Incorporated Electrical Specifications 141
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