Renesas Electronics RX14T Motor Control Microcontrollers

Renesas Electronics RX14T Motor Control Microcontrollers offer improved performance and enhanced functionality compared to the RX13T and RX23T MCU groups. These MCUs are entry-level inverters that feature a 48MHz RXv2 core with a Trigonometric Function Unit (TFU) and rich analog and timer functions. The RX14T motor control MCUs feature a sensorless FOC for a single motor at a 20kHz carrier frequency (50µs cycle), with approximately 65% CPU usage. These MCUs incorporate a GPT timer, integrated MTU3 timer, automatic deadtime insertion for sawtooth PWM, and asymmetric complementary PWM generation. The RX14T MCUs feature a Program Gain Amplifier (PGA), a comparator, and a DAC, which help reduce the external circuits required for overcurrent detection and motor drive. Typical applications include motor control, system control, PFC control, home appliances, and building automation.

The RX14T MCUs support packages up to 64 pins and include the RX family’s first 24-pin QFN (4mm x 4mm) and the first 125°C-capable models. These microcontrollers operate at a 5V power supply to improve noise immunity and analog dynamic range.

Features

Capability to control single motor + α (system control and PFC control)
RX13T and RX23T successor, pin-to-pin compatible
5V support and RXv2 48MHz with TFUv1 (trigonometric accelerator)
Increase GPIO (ex. GPIO 44pin on 48pinPKG), system pin 4pin only
Supports automatic deadtime insertion for sawtooth PWM and asymmetric complementary PWM generation
GPT timer and traditional MTU3 timer
RX14T also supports the 5V power supply commonly required in motor controllers, improving noise immunity and analog input dynamic range
Supports the Flexible Motor Control Kit (MCK), allowing users to easily begin evaluation using brushless DC motors (PMSM/BLDC)

Inverter timer for both have MTU3 and GPT: set pin-layout with PWM output for dual motors
12bit ADC 2unit, converter time minimum 0.5us and PGA 3ch, CMP 3ch with DAC 2ch for ref voltage
First RX product to support high temperatures T_a =125°C
Additional analog features include Program Gain Amplifier (PGA), comparator, and DAC—helping reduce external circuits required for overcurrent detection and motor drive
High precision HOCO (±1%) eliminates the need for an external oscillator, contributing to the reduction of PCB area and BOM cost
QFN 24, 32, 48-pin, wide pitch PKG 32(0.8mm), 44(0.8mm), 52(0.65mm), and 64(0.65mm) pin