Renesas reveals power peripherals on 32bit MCU family
“The functions are implemented in hardware, so the processing capabilities of the 32bit RX core can be applied to the main processing routine, motor or inverter control for example, while dc-dc power management control takes place simultaneously.” said the firm.
Higher resolution pulse generation comes through a 32x phase-locked loop which boosts PWM sub-system clocking to 3.2GHz, increasing resolution to 312.5ps when the core is clocked at 100MHz. This compares to 10ns resolution available previously. PWM counting is 16 bit.
The control loop block implements a hardware proportional-integral control loop algorithm that also automatically maintains PSU performance in the face of production variations in components including the main inductor and capacitor.
“Components variation of up to -35/+50% could be accepted,” said the firm.
To help designers to generate starting values for the various algorithm parameters, the company is developing an Excel-based simulation tool.
The two new blocks are only available in 100, 112, 120 and 144pin versions of RX63T microcontrollers.
Electronics Weekly has been told that the two blocks have been in the silicon for a while, but only now are they qualified and tested.