Renesas offers a variety of microcontrollers for air conditioner control to realize a more comfortable living environment. The RX24T Group and RX66T Group can control two inverters and has a built-in floating-point unit (FPU) that facilitates vector control, making it suitable for outdoor units. The RL78 Family, the RX130 Group, the RX230 Group, the RX651 Group, the RA4M1 Group and the RA6M1 Group are designed for indoor units. The RL78/L12 Group and the RL78/L13 Group are for use in remote controls. Renesas delivers solutions optimized to customer requirements.

Air Conditioner (High-End)

System Block Diagram (Indoor Unit/Remote Controller)

System Block Diagram (Outdoor Unit)

Recommended Products
Block Semiconductor Device Recommended Products Features
Remote Controller MCU RL78/L12 Group
RL78/L13 Group
16-bit MCU, Segment LCD driver, optimal for remote controller
Indoor Unit MCU RX130 Group
RX230 Group
Enhanced Capacitive Touch function, 5V operation
Enhanced DSP/FPU, Connectivity (USB), HMI (Capacitive Touch), Security, Low power consumption, 5V
RX651 Group Large-capacity RAM, Connectivity (Ethernet, USB), HMI (LCD), Security, Motor
RL78/G13 Group
RL78/G13A Group
5V operation, Rich line-up, can be used in a wide variety of applications
5V operation with low operating current
RA4M1 Group
RA6M1 Group
Arm Cortex-M4 with LCD Controller and Capacitive Touch for HMI
Arm Cortex-M4 core Capacitive Touch for HMI and advanced analog
Sensors ZMOD4410
Air Quality Monitoring
High-Performance Relative Humidity and Temperature Sensor
Outdoor Unit MCU RX24T Group
RX66T Group
32-bit MCU including on-chip FPU enable to drive two motors simultaneously
RXv3 Core, Motor specialized specifications (max.4 motors)
RA6T1 Group 32-bit MCU including on-chip FPU enable to drive two motors simultaneously
Critical conduction mode interleaving
One package(IGBT + FRD) for PFC, 600V, 20A
High-speed switching, optimal IGBT for PFC, 650VA, 40A
Optimal FRD for PFC, 600V, 20A
MCU Peripheral Op-amp


Full range input/output, high slew rate
Low power consumption, high slew rate
Signal Interface in
Indoor/Outdoor Unit
Photocoupler (standard) PS23xx Series
PS28xx Series
High isolation voltage (5kVr.m.s.), 4p-LSOP, Ta=115°C
High isolation voltage (2.5kVr.m.s.), 4p-SSOP, Ta=100°C
High isolation voltage (5kVr.m.s.), 4p-LSSOP, Ta=115°C
Interface in PFC
Photocoupler (IGBT drive)


High isolation voltage (5kVr.m.s.), 2.5A output
High CMR (CMR.≧50kV/ µs), Optimal for IPM drive
Related Application Notes/Sample Code
Name Document No.
R2A20112A application note R03AN0009EJ0100
R2A20114B application note R03AN0011EJ0100
RL78/G13 Initialization R01AN0451EJ0201
RL78/G13 A/D Converter (Software Trigger and Sequential Conversion Modes) CC-RL R01AN2581EJ0200
RL78/G13 Timer Array Unit (PWM Output) R01AN0455EJ0200
RL78/G14 Timer RD in Complementary PWM Mode R01AN0865EJ0110
RL78/G14 Timer RD in Reset Synchronous PWM Mode R01AN0866EJ0110
RL78/G14 Serial Array Unit (UART Communication) CC-RL R01AN3278EJ0100
RL78/G1F Serial Array Unit (UART Communication) CC-RL R01AN3314EJ0100
RX130 Group Initial Setting R01AN2592EJ0201
RX230 Group Initial Setting R01AN2826EJ0100
RX24T Group Initial Settings Example R01AN2837EJ0100
RL78/L12 Serial Array Unit (UART Communication) CC-RL R01AN3316EJ0100
RL78/L13 Serial Array Unit (UART Communication) CC-RL R01AN3317EJ0100
RL78/L13 How to Output Remote Control Signals R01AN1509EJ0100
RX Family RX Driver Package Ver.1.11 R01AN3467EJ0111
CS+ Code Generator Tool Integrated Development Environment User's Manual: RX API Reference R20UT3103EJ0130
e2 studio Code Generator User's Manual: RX API Reference R20UT2864EJ0130
CS+ Code Generator Tool Integrated Development Environment User's Manual: RL78 API Reference R20UT3102EJ0104
e2 studio Code Generator Integrated Development Environment User's Manual:RL78 API Reference R20UT3127EJ0104
For application notes about motor control, please see the Motor Control page. -
For application notes about capacitive touch, please see the Capacitive Touch Sensor page. -
Related Software
Related Boards
Name Part No.
R2A20114B evaluation board * -
R2A20112A evaluation board * -
24V Motor Control Evaluation System for RX23T RTK0EM0006S01212BJ
RX24T CPU Card RTK0EM0009C03402BJ
RA6T1 motor RSSK RTK0EMA170S00020BJ

*: Please contact your sales representative or contact us directly.