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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. RL78/G22 touch off detection

    Hi, I'm developing a product on RL78/G22 and I'm using the touch peripheral. I noticed that if the MCU starts running with the touch pressed, then, the "touch on" condition is never met. Is there a way to work around this without re-starting the MCU ...

    Feb 22, 2024
  2. RL78/G22 UART and I2C conflict

    I receive a warning in the configurator when I have an I2C and an UART peripherals. It is not clear what's wrong in this situation.

    Sep 26, 2023
  3. RL78/G22 touch off detection

    Hi, I'm developing a product on RL78/G22 and I'm using the touch peripheral. I noticed that if the MCU starts running with the touch pressed, then, the "touch on" condition is never met. Is there a way to work around this without re-starting the MCU ...

    Feb 22, 2024
View All Results from Support Communities (35)

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 (58)

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