STM32F334X4 datasheet(23/115 Pages) STMICROELECTRONICS

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STM32F334x4 STM32F334x6 STM32F334x8

Functional overview

3.14.1

217 ps high-resolution timer (HRTIM1)

The high-resolution timer (HRTIM1) allows generating digital signals with high-accuracy

timings, such as PWM or phase-shifted pulses.

It consists of 6 timers, 1 master and 5 slaves, totaling 10 high-resolution outputs, which can

be coupled by pairs for deadtime insertion. It also features 5 fault inputs for protection

purposes and 10 inputs to handle external events such as current limitation, zero voltage or

zero current switching.

HRTIM1 timer is made of a digital kernel clocked at 144 MHz followed by delay lines. Delay

lines with closed loop control guarantee a 217 ps resolution whatever the voltage,

temperature or chip-to-chip manufacturing process deviation. The high-resolution is

available on the 10 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.

HRTIM1 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 HRTIM1 counters can be frozen and the PWM outputs enter safe state.

3.14.2

Advanced timer (TIM1)

The advanced-control timer can be seen as a three-phase PWM multiplexed on 6 channels.

They have complementary PWM outputs with programmable inserted dead-times. They can

also be seen as complete general-purpose timers. The 4 independent channels can be

used for:

•

Input capture

•

Output compare

•

PWM generation (edge or center-aligned modes) with full modulation capability

(0-100%)

•

One-pulse mode output

In debug mode, the advanced-control timer counter can be frozen and the PWM outputs

disabled to turn off any power switches driven by these outputs.

Many features are shared with those of the general-purpose TIM timers (described in

Section 3.14.3 using the same architecture, so the advanced-control timers can work

together with the TIM timers via the Timer Link feature for synchronization or event chaining.

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