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Overview
Low-end microwave ovens must provide simple operation as affordable electric household cooking appliances. They control the output power based on data obtained from thermal sensors, weight sensors, etc. In structural terms, the main output of a microwave oven is produced by a magnetron, with switching performed at commercial frequencies and output supplied to the magnetron.
Renesas has a broad lineup of MCU products suitable for microwave ovens. These include 78K0/Kx2-L and the R8C/3xD Series of microcontrollers, which are built around a high-performance CPU and integrate a PWM (Pulse Width Modulation) function and A/D converters to handle a variety of sensor inputs.
System Block Diagram
Recommended Products
| Block | Semiconductor Device | Recommended Product Name | Features, etc. |
|---|---|---|---|
| System control | MCU | 3803H Group | 8-bit general purpose (if no LCD display) |
| 3803L Group | |||
| 3850A Group | |||
| 38D2 Group | 8-bit LCD (if with LCD display) | ||
| 78K0/Kx2-L | 8-bit general purpose | ||
| 78K0/Kx2 | 8-bit general purpose (if no LCD display) | ||
| 78K0R/Kx3-L | 16-bit general purpose (if no LCD display) | ||
| R8C/35D Group | |||
| R8C/L36A, L38A | |||
| R8C/L3AA/B Group | |||
| EEPROM | R1EX24xxx Series | I2C bus interface *1 | |
| R1EX25xxx Series | SPI bus interface *2 | ||
| Power device | TRIAC | BCR-1AM-8 | Compartment lamp |
| Power supply | IC for power supply | HA17431 Series | Shunt regulator 1%, 0.5% precision |
| HA178L05UA, UPC78L05 | 3-terminal regulator | ||
| UPC1093, UPC1943/1944 | Shunt regulator | ||
| MCU peripheral | Reset IC | RNA519xx Series | Variable detection voltage |
| Op-amp | HA1630xxx Series | CMOS op-amp | |
| Sensor output amplification, detection | Op-amp | HA1630xxx Series | General use CMOS op-amp |
| UPC324 | Low power consumption | ||
| Comparator | HA1631 Series | General use CMOS comparator | |
| UPC358 | Low power consumption | ||
| General use, surge absorption, circuit protection, etc. | Zener diode | HZMxNB Series | 3-terminal (1 device included) face-mount outline High ESD tolerance optimal for use in surge absorption |
| NNCDxxDA Series | High ESD tolerance optimal for use in surge absorption | ||
| RDxxS Series | 2-terminal face-mount outline | ||
| RKZxxKG Series | 2-terminal face-mount outline High ESD tolerance optimal for use in surge absorption | ||
| Switching diode | HSM2838C, HSM123 | 3-terminal (2 devices included) face-mount outline | |
| HSU119/HSC119 | 2-terminal face-mount outline | ||
| Schottky barrier diode | HRB0502A | 3-terminal face-mount outline (low VF) | |
| HRC0103C | 2-terminal face-mount outline (low VF and low leak current) | ||
| HRV103B | 2-terminal face-mount small outline (Io = 1 A) Low IR optimal for use in circuit protection | ||
| RKR104BKH | |||
| TRIAC control | Photocoupler (standard) | PS25xx Series PS27xx Series PS28xx Series | High isolation voltage (5 kV r.m.s.), 4p-DIP High isolation voltage (3.75 kV r.m.s.), 4p-SOP High isolation voltage (2.5 kV r.m.s.), 4p-SSOP |
*1 I2C: Inter-Integrated Circuit
*2 SPI: Serial Peripheral Interface
Related Application Notes/Sample Code
| Name | Document No. |
|---|---|
| 38D2 LCD drive control circuit (internal dividing resistor usage example 1) |
REJ05B0994-0100 |
| 38D2 LCD drive control circuit (internal dividing resistor usage example 2) |
REJ05B0995-0100 |
| 38D5 LCD drive control circuit (external dividing resister usage) |
REJ05B0926-0200 |
| 38D5 LCD drive control circuit (voltage multiplier usage) | REJ05B0927-0200 |
| LCD drive control circuit (external dividing resistor usage) |
REJ05B0996-0100 |
| Power MOS FET application note | REJ05G0001-0200 |
| R2A20112 application note * | - |
| R2A20114 application note * | - |
| R2A20117 application note * | - |
| R2A20118A application note * | - |
| R2A20121 application note * | - |
| R2A20132 application note * | - |
*：Please contact your sales representative or contact us directly.
Related Software
| Name | Document No. |
|---|---|
| M3S-S2-Tiny sound playback system * |
-
|
*: Please contact your sales representative or contact us directly.
Related Boards
| Name | Part No. |
|---|---|
| R2A20111 evaluation board * |
-
|
| R2A20112 evaluation board * |
-
|
| R2A20114 Series evaluation board * |
-
|
| R2A20115 evaluation board * |
-
|
| R2A20117 evaluation board * |
-
|
| R2A20118A evaluation board * |
-
|
| R2A20121 evaluation board * |
-
|
| R2A20132 evaluation board * |
-
|
*：Please contact your sales representative or contact us directly.
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