Datasheet

PWM
(B)
TZ
XCLKOUT
(A)
t
w(TZ)
t
d(TZ-PWM)HZ
TMS320F2809, TMS320F2808, TMS320F2806
TMS320F2802, TMS320F2801, TMS320C2802
TMS320C2801, TMS320F28016, TMS320F28015
www.ti.com SPRS230N –OCTOBER 2003–REVISED MAY 2012
6.10 Enhanced Control Peripherals
6.10.1 Enhanced Pulse Width Modulator (ePWM) Timing
PWM refers to PWM outputs on ePWM1–6. Table 6-22 shows the PWM timing requirements and Table 6-
23, switching characteristics.
Table 6-22. ePWM Timing Requirements
(1)
TEST CONDITIONS MIN MAX UNIT
t
w(SYCIN)
Sync input pulse width Asynchronous 2t
c(SCO)
cycles
Synchronous 2t
c(SCO)
cycles
With input qualifier 1t
c(SCO)
+ t
w(IQSW)
cycles
(1) For an explanation of the input qualifier parameters, see Table 6-15.
Table 6-23. ePWM Switching Characteristics
PARAMETER TEST CONDITIONS MIN MAX UNIT
t
w(PWM)
Pulse duration, PWMx output high/low 20 ns
t
w(SYNCOUT)
Sync output pulse width 8t
c(SCO)
cycles
t
d(PWM)tza
Delay time, trip input active to PWM forced high no pin load 25 ns
Delay time, trip input active to PWM forced low
t
d(TZ-PWM)HZ
Delay time, trip input active to PWM Hi-Z 20 ns
6.10.2 Trip-Zone Input Timing
A. TZ: TZ1, TZ2, TZ3, TZ4, TZ5, TZ6
B. PWM refers to all the PWM pins in the device. The state of the PWM pins after TZ is taken high depends on the PWM
recovery software.
Figure 6-17. PWM Hi-Z Characteristics
Table 6-24. Trip-Zone input Timing Requirements
(1)
MIN MAX UNIT
t
w(TZ)
Pulse duration, TZx input low Asynchronous 1t
c(SCO)
cycles
Synchronous 2t
c(SCO)
cycles
With input qualifier 1t
c(SCO)
+ t
w(IQSW)
cycles
(1) For an explanation of the input qualifier parameters, see Table 6-15.
Copyright © 2003–2012, Texas Instruments Incorporated Electrical Specifications 115
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TMS320C2801 TMS320F28016 TMS320F28015