AM1808AZCED3 datasheet(238/264 Pages) TI

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PWM(A)

tw(TZ)

td(TZ-PWM)HZ

AM1808

SPRS653A – FEBRUARY 2010 – REVISED APRIL 2010

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6.29.2 Trip-Zone Input Timing

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 6-79. PWM Hi-Z Characteristics

Table 6-128. Trip-Zone input Timing Requirements

PARAMETER

TEST CONDITIONS

1.3V, 1.2V, 1.1V, 1.0V

MIN

MAX

UNIT

tw(TZ)

Pulse duration, TZx input low

Asynchronous

1tc(SCO)

cycles

Synchronous

2tc(SCO)

cycles

Table 6-129 shows the high-resolution PWM switching characteristics.

Table 6-129. High Resolution PWM Characteristics at SYSCLKOUT = (60 - 100 MHz)

PARAMETER

1.3V, 1.2V

1.1V

1.0V

MIN

TYP

MAX

MIN

TYP

MAX

MIN

TYP

MAX UNIT

Micro Edge Positioning (MEP) step size(1)

200

(1)

MEP step size will increase with low voltage and high temperature and decrease with high 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.

238

Peripheral Information and Electrical Specifications

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