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RL78/I1E

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High-precision Analog Microcontroller with Configurable AFE

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Overview

The RL78/I1E microcontroller is an intelligent, flexible analog MCU suitable for countless industrial and medical sensing applications such as flow measurement, strain gauges, pressure or temperature sensing. With enhanced analog features such as configurable op-amps with programmable gain, supporting inverting, non-inverting topologies, or instrumentation amplifiers, the RL78/I1E can be a platform for different types of sensors. The RL78/I1E features a 24-bit delta-sigma A/D, and a separate 10-bit A/D block, with a 12-bit D/A. The package lineup for RL78/I1E MCU goes down to 4 mm x 4 mm or 5 mm x 5 mm reducing PCB footprint. Operating temperature up to 125°C makes it an ideal solution for the harshest of environments.

RL78/I1E Block Diagram
RL78/I1E Block Diagram
  • CPU: RL78 core, Max. 32MHz
  • Voltage: 2.4V to 5.5V
  • Package: 36-pin BGA, 32-pin QFN
  • Memory: SRAM Max. 8KB, Program Flash Max. 32KB

Documentation

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/I1E CSI interface, can it be used as SPI

    Hello,    In the RL78/I1E MCU, Can the CSI interface used for interfacing a SPI slave and use SPI protocol. In that case, Is there any document that guides how CSI port can be used for SPI communication.   Can you please help me with this query   Thanks in advance.

    Oct 23, 2018
  2. RL78/I1E timer g

    Generate interrupt on positive edge of pwm signal from timer g

    Jul 20, 2023
  3. RL78/I1E 24 bit Sigma Delta ADC offset

    I'm not sure I properly understand the data sheet for the ADC offset specs - In my application I will have Gset1 & Gset2  both set at 8. From the data sheet it seems the offset adjustment range is ± 164/8 = ± 20mV, with an offset adjustment step size of ...

    May 19, 2023

FAQs

  1. Tell me the points to be aware of when using the RL78 Code Generator with the WDT.

    In the RL78 Code Generator, the Watchdog Timer (WDT) is set to 'Enabled' by default, as shown in the diagram below. To avoid unintended resets by the WDT, please either select 'Disabled' for the 'Watchdog Timer Operation Setting' or add a program to clear the Watchdog Timer counter.

    Dec 10, 2024
  2. RL78 Family: Is it possible to initialize the on-chip debug security ID?

    ... 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

    Aug 1, 2025
  3. 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
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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.