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DRA821U4...ALM 数据表(PDF) 157 Page - Texas Instruments |
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DRA821U4...ALM 数据表(HTML) 157 Page - Texas Instruments |
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157 / 252 page  7.9.5.5.2 Switching Characteristics for ECAP NO. PARAMETER DESCRIPTION MIN MAX UNIT CAP2 tw(APWM) Pulse duration, APWMx high/low -2 + 2P (1) ns (1) P = sysclk period in ns APWM CAP2 EPERIPHERALS_TIMNG_02 Figure 7-51. ECAP Output Timings For more information, see Enhanced Capture (ECAP) Module section in Peripherals chapter in the device TRM. 7.9.5.6 EPWM The supported features by the device EPWM are: • Dedicated 16-bit time-base counter with period and frequency control • Two independent PWM outputs which can be used in different configurations (with single-edge operation, with dual-edge symmetric operation or one independent PWM output with dual-edge asymmetric operation) • Asynchronous override control of PWM signals during fault conditions • Programmable phase-control support for lag or lead operation relative to other EPWM modules • Dead-band generation with independent rising and falling edge delay control • Programmable trip zone allocation of both latched and un-latched fault conditions • Events enabling to trigger both CPU interrupts and start of ADC conversions Table 7-34 represents EPWM timing conditions. Table 7-34. EPWM Timing Conditions PARAMETER DESCRIPTION MIN MAX UNIT Input Conditions tSR Input slew rate 1 4 V/ns Output Conditions CLOAD Output load capacitance 2 7 pF Section 7.9.5.6.1, and Section 7.9.5.6.2 present timing and switching characteristics for EPWM (see Figure 7-52, Figure 7-53, Figure 7-54, and Figure 7-55). 7.9.5.6.1 Timing Requirements for EPWM NO. PARAMETER DESCRIPTION MIN MAX UNIT PWM1 tw(PWM) Pulse duration, PWM output high/low P -3 (1) ns PWM2 tw(SYNCOUT) Pulse duration, Sync output P -3 (1) ns PWM3 td(TZ-PWM) Delay time, trip input active to PWM forced high/low 11 ns PWM4 td(TZ-PWMZ) Delay time, trip input active to PWM Hi-Z 11 ns www.ti.com DRA821U-Q1 SPRSP57D – APRIL 2020 – REVISED DECEMBER 2022 Copyright © 2022 Texas Instruments Incorporated Submit Document Feedback 157 Product Folder Links: DRA821U-Q1 |
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