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32G474 数据表(PDF) 36 Page - STMicroelectronics |
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32G474 数据表(HTML) 36 Page - STMicroelectronics |
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36 / 236 page  Functional overview STM32G474xB STM32G474xC STM32G474xE 36/236 DS12288 Rev 4 3.24.1 High-resolution timer (HRTIM) The high-resolution timer (HRTIM) allows generating digital signals with high-accuracy timings, such as PWM or phase-shifted pulses. It consists of 7 timers, 1 master and 6 slaves, totaling 12 high-resolution outputs, which can be coupled by pairs for deadtime insertion. It also features 6 fault inputs for protection purposes and 10 inputs to handle external events such as current limitation, zero voltage or zero current switching. HRTIM timer is made of a digital kernel clocked at 170 MHz followed by delay lines. Delay lines with closed loop control guarantee a 184 ps resolution whatever the voltage, temperature or chip-to-chip manufacturing process deviation. The high-resolution is available on the 12 outputs in all operating modes: variable duty cycle, variable frequency, and constant ON time. The slave timers can be combined to control multiswitch complex converters or operate independently to manage multiple independent converters. The waveforms are defined by a combination of user-defined timings and external events such as analog or digital feedbacks signals. HRTIM timer includes options for blanking and filtering out spurious events or faults. It also offers specific modes and features to offload the CPU: DMA requests, burst mode controller, push-pull and resonant mode. It supports many topologies including LLC, Full bridge phase shifted, buck or boost converters, either in voltage or current mode, as well as lighting application (fluorescent or LED). It can also be used as a general purpose timer, for instance to achieve high-resolution PWM-emulated DAC. In debug mode, the HRTIM counters can be frozen and the PWM outputs enter safe state. 3.24.2 Advanced motor control timer (TIM1, TIM8, TIM20) The advanced motor control timers can each be seen as a four-phase PWM multiplexed on 8 channels. They have complementary PWM outputs with General- purpose TIM3, TIM4 16-bit Up, down, Up/down Any integer between 1 and 65536 Yes 4 No General- purpose TIM15 16-bit Up Any integer between 1 and 65536 Yes 2 1 General- purpose TIM16, TIM17 16-bit Up Any integer between 1 and 65536 Yes 1 1 Basic TIM6, TIM7 16-bit Up Any integer between 1 and 65536 Yes 0 No Table 7. Timer feature comparison (continued) Timer type Timer Counter resolution Counter type Prescaler factor DMA request generation Capture/ compare channels Complementary outputs |
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