AM1808 datasheet(233/262 Pages) TI

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PWM(A)

tw(TZ)

td(TZ-PWM)HZ

AM1808

www.ti.com

SPRS653C

– FEBRUARY 2010 – REVISED DECEMBER 2011

5.29.3 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 5-79. PWM Hi-Z Characteristics

Table 5-128. Trip-Zone input Timing Requirements

PARAMETER

TEST CONDITIONS

1.3V, 1.2V, 1.1V, 1.0V

UNIT

MIN

MAX

tw(TZ)

Pulse duration, TZx input low

Asynchronous

1tc(SCO)

cycles

Synchronous

2tc(SCO)

cycles

Table 5-129 shows the high-resolution PWM switching characteristics.

Table 5-129. High Resolution PWM Characteristics at SYSCLKOUT = (60 - 100 MHz)

PARAMETER

1.3V, 1.2V

1.1V

1.0V

UNIT

MIN

TYP

MAX

MIN

TYP

MAX

MIN

TYP

MAX

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.

Peripheral Information and Electrical Specifications

233

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