Texas Instruments TMS320F2802 Enhanced Capture eCAP Timing Requirement1, MIN TYP MAX Unit

TMS320F2809, TMS320F2808, TMS320F2806

TMS320F2802, TMS320F2801, TMS320C2802

TMS320C2801, TMS320F28016, TMS320F28015

SPRS230L –OCTOBER 2003 –REVISED DECEMBER 2009 www.ti.com

Table 6-25shows the high-resolution PWM switching characteristics.

Table 6-25. High-Resolution PWM Characteristics at SYSCLKOUT = (60–100 MHz)

	MIN	TYP	MAX	UNIT
Micro Edge Positioning (MEP) step size(1)		150	310	ps

(1)Maximum MEP step size is based on worst-case process, maximum temperature and maximum voltage. MEP step size will increase with low voltage and high temperature and decrease with voltage and cold temperature.

Applications that use the HRPWM feature should use MEP Scale Factor Optimizer (SFO) estimation software functions. See the TI software libraries for details of using SFO function in end applications. SFO functions help to estimate the number of MEP steps per SYSCLKOUT period dynamically while the HRPWM is in operation.

Table 6-26shows the eCAP timing requirement and Table 6-27shows the eCAP switching characteristics.

Table 6-26. Enhanced Capture (eCAP) Timing Requirement(1)

		TEST CONDITIONS	MIN	MAX	UNIT
tw(CAP)	Capture input pulse width	Asynchronous	2tc(SCO)		cycles
		Synchronous	2tc(SCO)
		With input qualifier	1tc(SCO) + tw(IQSW)

(1)For an explanation of the input qualifier parameters, see Table 6-15 .

Table 6-27. eCAP Switching Characteristics

	PARAMETER	TEST CONDITIONS	MIN	MAX	UNIT
tw(APWM)	Pulse duration, APWMx output high/low		20		ns

Table 6-28shows the eQEP timing requirement and Table 6-29shows the eQEP switching characteristics.

Table 6-28. Enhanced Quadrature Encoder Pulse (eQEP) Timing Requirements(1)

		TEST CONDITIONS	MIN	MAX	UNIT
tw(QEPP)	QEP input period	Asynchronous/synchronous	2tc(SCO)		cycles
		With input qualifier	2[1tc(SCO) + tw(IQSW)]
tw(INDEXH)	QEP Index Input High time	Asynchronous/synchronous	2tc(SCO)		cycles
		With input qualifier	2tc(SCO) +tw(IQSW)
tw(INDEXL)	QEP Index Input Low time	Asynchronous/synchronous	2tc(SCO)		cycles
		With input qualifier	2tc(SCO) + tw(IQSW)
tw(STROBH)	QEP Strobe High time	Asynchronous/synchronous	2tc(SCO)		cycles
		With input qualifier	2tc(SCO) + tw(IQSW)
tw(STROBL)	QEP Strobe Input Low time	Asynchronous/synchronous	2tc(SCO)		cycles
		With input qualifier	2tc(SCO) +tw(IQSW)

(1)For an explanation of the input qualifier parameters, see Table 6-15 .

Table 6-29. eQEP Switching Characteristics

	PARAMETER	TEST CONDITIONS	MIN	MAX	UNIT
td(CNTR)xin	Delay time, external clock to counter increment			4tc(SCO)	cycles
td(PCS-OUT)QEP	Delay time, QEP input edge to position compare sync output			6tc(SCO)	cycles

116 Electrical Specifications Copyright © 2003–2009, Texas Instruments Incorporated

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