2
\$\begingroup\$

I am used to work with PICs, but I want to start using AVRs as well. One thing I like in the PICs is the EPWM (enhanced PWM) peripheral, in which you just set a couple of registers, and the PIC will generate all the control signals for a H-Bridge, or Half-Bridge control, including dead-time and push-pull signals.

I want to know if there is something like this in the Atmel MCUs, and it's name, so I might find it on the datasheet and select the proper MCU for my projects.

\$\endgroup\$
  • \$\begingroup\$ I've read about dead time generator in the datasheet for ATtiny45, which is an AVR. So it is worth the effort to check other AVR datasheets or the selection tool on atmel.com \$\endgroup\$ – jippie Feb 17 '13 at 17:29
1
\$\begingroup\$

I work mainly with PICs (and ARM) also, but the AVRs have very similar peripherals which will do what you are looking for.

The ATxmega 8-bit series micros have the standard timers and input/output capture/compare peripherals (similar to the PICs CCP). These can be set up for motor driving, with dead time, etc.

To quote from this App note on BLDC motor control:

ATxmega128A1 provides 16-bit timers/counters with : 
Four Compare or Capture (CC) Channels in Timer/Counter 0 
Two Compare or Capture (CC) Channels in Timer/Counter 1 
To generate PWM frequency, this Application Note uses three compare channels 
(A,B,C) of Timer0 and the Advanced Waveform Extension (AWEX) additional feature 
to Timer 0. AWEX function is available for ports C and E (Port C is used in this 
Application Note). 
The benefits of AWEX features for motor control are : 
• Complementary outputs from each Capture channel 
• Four Dead Time Insertion (DTI) which avoid cross conduction 
• Separate High and Low Side Dead-Time Setting
• Double Buffered Dead-Time 
• Event Controlled Fault Protection 
• Single Channel Multiple Output Operation  
• Double Buffered Pattern Generation 

I would have a browse round the site, read some app notes and check out a few of the offerings.

\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.