Renesas Electronics announced the release of the RX63T, the latest member of the broad RX series of microcontrollers (MCUs).
It features special inverter control timers and analog functions required for today’s inverter control applications like air conditioners, washing machines, solar inverter solutions and lighting control.
The six new RX63T MCUs include two three-phase motor control timer units: a multifunction timer pulse unit 3 (MTU3) and a 16-bit general-purpose PWM timer (GPT). The MTU3 supports the complementary PWM, while the GPT can independently control four channels of single-phase inverter, and control of the right and the left dead-time can be controlled individually.
The timer uses the same clock as the CPU at 80 MHz. This enables it to achieve a wide range of width measurements for PWM output waveforms with resolutions as high as 12,5 ns. Improved analog functions to enable increased system cost reduction and improve ease of use in motor vector control applications have also been implemented with the new MCUs. It features one 12-bit A-D converter (ADC) unit which can capture analog input values with a minimum conversion time of one microsecond.
The ADCs can be used for sensorless vector control methods, such as three-shunt or single-shunt current detection, as simultaneous sampling of three input channels is possible. Continuous A-D conversion is supported by the double data registers installed in the module. In addition, the RX63T has three-channel analog comparators assigned to the 12-bit ADC inputs. Each comparator has three detection levels, enabling easy monitoring and emergency shutdown of external IGBTs.
The new MCUs also incorporate many safety features, such as an independent watchdog with its own on-chip clock source (IWDT), a self-check function, a DOC (data operation circuit) enabling RAM checking without CPU involvement, a CAC (clock frequency accuracy measurement circuit) to check clock frequencies and an RWP (register write protection) function that protects important registers from being accidentally overwritten.
As fractional calculations are required in vector control algorithms, the RX63T supports a single precision floating point unit (FPU). This simplifies decimal point calculation, boosting the overall processing performance.
The devices in the RX63T group provide a scalable memory solution from 32 KB to 64 KB Flash with up to 8 KB of embedded SRAM. They also include an additional independent 8 KB of data Flash memory with a background operation (BGO) function that enables data to be written while a program is executing.
The embedded Flash memory is based on Renesas’ proven MONOS (metal oxide nitride oxide silicon) technology that can be accessed without wait state insertion. This enables a maximum performance level of 1,65 DMIPS/MHz at any CPU frequency, without any limitation from Flash technology.
The products are offered in 48-pin and 64-pin LQFP packaging. To help customers shorten the development cycles of new embedded systems, Renesas, third-party suppliers and the alliance partner network support the RX with a variety of hardware and software tools.
For more information contact Marinus Rudman, Hi-Q Electronics, +27 (0)21 595 1307, [email protected], www.hi-q.co.za
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