ZUSBOPTSC01ZAC datasheet(89/402 Pages) ZILOG

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PS024604-1005

P R E L I M I N A R Y

Architecture

Z8FMC16100 Series Flash MCU

Product Specification

Pulse-Width Modulator

The Z8FMC16100 Series Flash MCU includes a Pulse-Width Modulator (PWM) opti-

mized for Motor Control applications. The PWM features include:

• 6 independent PWM outputs or 3 complementary PWM output pairs

• Programmable deadband insertion for complementary output pairs

• Edge-aligned or center-aligned PWM signal generation

• PWM OFF state is option-bit-programmable

• PWM outputs driven to OFF state on System Reset

• Asynchronous disabling of PWM outputs on system fault; outputs are forced to OFF

state

• FAULT inputs generate pulse-by-pulse or hard shutdown

• 12-bit reload counter with 1-, 2-, 4-, or 8-bit programmable clock prescaler

• High current source and sink on all PWM outputs

• PWM pairs can be used as general-purpose inputs when outputs are disabled

• Analog-to-digital converter synchronized with PWM period

• Narrow pulse suppression with programmable threshold

Architecture

The PWM unit consists of a master timer to generate the modulator time base and six inde-

pendent compare registers to set the pulse-width modulation for each output. The six out-

puts are designed to provide control signals for inverter drive circuits. As such, the outputs

are grouped into pairs consisting of a High driver and a Low driver output. The output

pairs are programmable to operate independently or as complementary signals. In comple-

mentary output mode, a programmable dead time is inserted to ensure nonoverlapping sig-

nal transitions. The master count and compare values feed into modulator logic that

generates the proper transitions in the output states. Output polarity and fault/OFF state

control logic allows programming of the default OFF states, which forces the outputs to a

safe state in the event a fault in the motor drive is detected.

Figure 7 illustrates the architecture of the PWM modulator.

ZUSBOPTSC01ZAC 数据表(PDF) 89 Page - Zilog, Inc.