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RL78/I1B

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Product Longevity: 2034

Low Power Microcontrollers with 24-bit ΔΣ A/D Converter, RTC Backup and High-accuracy Oscillator Ideal for Electricity Meters

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Overview

RL78/I1B microcontrollers adapt various electricity meter metrologies for different regulations by country and realize efficient power measurement by the combination of low active current 96uA/MHz, standby current 0.66uA (Halt mode with 32kHz oscillator and RTC backup on), 24-bit ΔΣA/D converter, phase adjustment circuits and high pass filter. CPU clock frequency can be minimized, taking advantage of the efficient power measurement features, which include the low power ΔΣ A/D converter 0.53mA/ch. RL78/I1B microcontrollers have a +/- 1% high-accuracy high-speed on-chip oscillator with +/-0.05% frequency correction function. The benefit of the accurate on-chip oscillator keeps the system robust even when the external oscillator is stopped.

RL78/I1B Block Diagram
RL78/I1B Block Diagram
  • CPU: RL78 core, Max. 24MHz
  • Voltage: 1.9V to 5.5V
  • Package: 80 to 100-pin QFP
  • Memory: SRAM Max. 8KB, Program Flash Max. 128KB

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Design & Development

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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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Resources

Support Communities

  1. RL78 I1B R5F10MMG , Required data flash and store 15 byte in this data flash memory

    Dear Sir, i am using the R5F10MMG MCU in our project and development almost done, we required in end time of project data flash memory for save the 15 bytes in this data flash memory. Please guide me and help for this issues. Thanks & Regards Shivali Singh

    Sep 2, 2021
  2. RL78

    Hi friends,              I am working on (RL78/I1B - R510MMGD) Controller. I am facing problem on Internal RTC. Can u suggest me to solve this Problem? Initially, i set (i.e : mark -> set initial time and date) the RTC date and RTC time on Code generator. Then i Checked without ...

    Oct 8, 2014
  3. Emulator E2 lite for serial communication

    Hi Team, Is it possible to use Emulator E2 lite connected to a RL78 target board to communicate to PC serial terminal (for e.g. I want to do some printf/sprintf from the target board and print on the PC's hyperterminal)? Can you guide with the process ...

    Apr 28, 2023
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FAQs

  1. RL78 Family: Reset signal generated by the power-on reset circuit (POR)

    ... G1H, RL78/G1M,RL78/G1N, RL78/G1P, RL78/G22, RL78/G23, RL78/G24, RL78/H1D, RL78/I1A, RL78/I1B, RL78/I1C, RL78/I1D, RL78/I1E, RL78/L12, RL78/L13, RL78/L1A, RL78/L1C   Japanese

    Apr 28, 2025
  2. Reference Materials for Migration from 78K0/Kx2 to RL78

    We have the following reference materials available.  - How to replace a program for 78K0 with a program for RL78　　Replacement Guide for 78K0 Family to RL78 Family (CcnvCA78K0)         Software for converting a C source file for CA78K0 and CA78K0R to a C source file for CC-RL　　　　CcnvCA78K0 C Source ...

    Dec 21, 2020
  3. RL78 Family: Relationship between A/D Conversion Resolution and A/D Conversion Time

    ... ✓ (Note)   ✓ ✓ Different B   ✓ ✓ ✓ Same C   ✓   ✓ Different D   ✓     N/E E     ✓ ✓ Different   Group A: RL78/I1B, RL78/I1C, RL78/I1EGroup B: RL78/G23, RL78/G24Group C: RL78/G1A, RL78/G1P, RL78/ ...

    Nov 12, 2024
View All Results from FAQs (6)

Videos & Training

The easy-to-build RL78 Quick Solutions feature Renesas' ultra-low power RL78 MCUs and analog devices. These solutions showcase device combinations that improve design performance and power efficiency to support your product development.

News & Blog Posts

Blog Post
Feb 9, 2023
Smart Energy Metering for a Greener Future