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RL78/G22

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Product Longevity: 2037

General-Purpose Microcontrollers with Excellent Low-Power Performance and Rich Capacitive Touch Channels

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Overview

The RL78/G22 microcontroller features the industry's lowest current consumption levels of 37.5µA/MHz during CPU operation and 200nA during STOP, as well as a rich array of capacitive touch channels. The lineup of new-generation RL78 general-purpose microcontrollers is extended by offering a variety of 16-pin to 48-pin packages and 32KB to 64KB of flash memory.

Along with a maximum operating frequency of 32MHz, a wide operating voltage range of 1.6V to 5.5V, and enhanced analog and security functions, the SNOOZE mode sequencer significantly reduces power consumption during intermittent operation. A rich development environment is provided for the RL78/G22 including an evaluation board (Fast Prototyping Board) that enables program writing/debugging without additional tools, simply by connecting a USB cable, and a Smart Configurator that facilitates design using a GUI. It is also compatible with the existing RL78 family and can be a seamless replacement, making it suitable for a wide range of applications from home appliances and consumer electronics to industrial equipment.

RL78/G22 Block Diagram
RL78/G22 Block Diagram
  • CPU: RL78 core, Max. 32MHz
  • Voltage: 1.6V to 5.5V
  • Package: 16-pin to 48-pin
  • Memory: Program Flash: 32KB to 64KB, SRAM 4KB, Data Flash 2KB
  • Operating temperature range:​ up to 105 °C
  • Enhanced Capacitive Sensing Unit (CTSU2L)
  • Timer: 16-bit Timer (ch) x 8, Watchdog Timer (ch) x 1, 32-bit Interval Timer x 1 ch
  • PWM: PWM Output x 7
  • Analog function: 10-bit A/D Converter (ch) x 10
  • On-chip Oscillator Freq. (MHz): High-Speed: up to 32MHz
  • Middle-Speed: up to 4MHz
  • Low-speed: 32.768kHz
  • Snooze mode sequencer
  • Event link controller
  • Others: RTC, Power-On Reset, Low Voltage Detection
  • Packages: SSOP, LQFP, HWQFN, WFLGA

Documentation

Design & Development

ECAD Models

Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on the CAD Model links in the Product Options table. If a symbol or model isn't available, it can be requested directly from SamacSys.

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Models
Type Title Date
Model - IBIS
RL78/G22 IBIS Model
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Resources

Support Communities

  1. External Interrupt not triggered in RL78/G22 mcu

    Hi team, I am using the RL78/G22 mcu with Fast prototyping board to develop the PWM output. In my scenario, I am using the switch as an external interrupt to trigger. But the interrupt function is not triggered when the switch was pressed, also the output duty cycle ...

    Feb 2, 2025
  2. RL78/G22 touch slider

    Dear Renesas support, I need to know if  a slider object can wake up the microcontroller using "automatic judgment using SMS support". Thanks.

    Nov 4, 2024
  3. RL78/G22 I2C Communication Issue

    Hello, I hope you are doing well. I am writing to discuss an issue we are encountering during communication between our Renesas RL78/G22 board and a sensor using the I2C protocol. To set up the communication, I added the IIC Communication component in master mode, selecting the IICA0 ...

    Oct 16, 2023
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FAQs

  1. Differences between the touch functionality of the RL78/G22 and RL78/G23

    Last Updated: 02/21/2023 Question: How does the internal touch functionality of the RL78/G22 differ from that of the RL78/G23? Answer: Multiple electrode connection (MEC) functionality has been added to the CTSU2La featured on the RL78/G22.Multiple touch channels can be ...

    Feb 21, 2023
  2. RL78/G22: Current consumption when measuring capacitive touch

    ... μA (reference value for the RL78/G22).   Figure 1: Current consumption results(Touch measurement using SMS/MEC function) Please refer to this document for details.RL78/G22 Capacitive Touch Low Power Guide (SMS / MEC function) (R01AN6847) Suitable Products RL78/G22   日本語 中文

    Jun 30, 2023
  3. Differences between the RL78/G23, RL78/G22, and RL78/G13

    Last Updated: 02/21/2023 Question: What are the differences between the RL78/G23, RL78/G22, and RL78/G13? Answer: Differences in functions and lineups are shown in the figure below. The RL78/G23 and RL78/G22 are new generation series in the ...

    Feb 21, 2023
View All Results from FAQs (60)

Videos & Training

This video will show the steps to operate the secondary device OTA firmware update solution via primary device with the AWS Cloud, tailored for low-end microcontrollers lacking direct internet connectivity.

The evaluation environment uses Renesas' RL78/G22 Fast Prototyping Board and Cloud Kit Based on RX65N (CK-RX65N).

News & Blog Posts

Blog Post
Apr 7, 2023
RL78/G22 Achieves World's Highest EEMBC ULPMark™-PP Score!
Blog Post
Feb 16, 2023
New-Generation RL78/G22 MCU Delivers Inexpensive and Highly Functional Sensor Solutions