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RL78/I1A

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Product Longevity: 2031

Microcontrollers that Output High-resolution PWM for Fine Dimming and Toning of Led Lighting

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Overview

RL78/I1A microcontrollers realize PWM output of a minimum 0.98 ns resolution using 64 MHz timer operation and dithering function, supporting fine dimming and toning. Through cooperation between the PWM timer and comparator/external interrupt input, PFC control and protection functions can be realized by hardware. Low consumption current of 3.3 mA during LED and power supply control and 0.23 μA when waiting for UART (DALI) communication allows the power consumption of the system to be reduced. DALI/DMX512 lighting communication and Power Management Bus (PMBus) and System Management Bus (SMBus) power communication are supported. These microcontrollers can be used in LED lighting equipment and digital power supplies.

RL78/I1A Block Diagram
RL78/I1A Block Diagram
  • CPU: RL78 core, Max. 32MHz
  • Voltage: 2.7V to 5.5V
  • Package: 32-pin QFN, 20 to 38-pin SOP
  • Memory: SRAM Max. 4KB, Program Flash Max. 64KB

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Resources

Support Communities

  1. RL78/I1A DALI protocol

    HI, ALL,  i was wondering whether the RL78/I1A support the 3bytes hardware decode for DALI protocol or not?  Thanks!

    Sep 25, 2015
  2. Starting with this controller

    Hello everyone my name is Rajdeep sing. I am starting with this controller, anybody tell me how to write program in this controller,send me the code for LED flashing.

    Jul 25, 2012
  3. RL78/G14

    Have anyone has a reference code for LED dimming using  PWM DAC using a potentiometer knob??

    Aug 19, 2021
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FAQs

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

    ... G1G, RL78/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 ...

    Apr 28, 2025
  2. RL78 Family product in which the frequency accuracy of the high-speed on-chip oscillator is high at high temperatures

    The M-version of RL78/G15 and RL78/I1A has a frequency accuracy of ±2% at temperatures ranging between -40 to +125°C with a voltage ranging between 2.4 to 5.5 V. Moreover, a frequency accuracy of ±1% is achieved at temperatures ranging between -20 to +85°C ...

    Jan 12, 2023
  3. RL78/G24 position, target application

    ... application? Answer: The RL78/G24 is positioned as a high-function, high-performance product in the RL78 family, and like the RL78/G14, RL78/G1F, and RL78/I1A, its target applications include motors, inverters, power supplies, and lighting. Suitable Products RL78/G24   日本語

    Sep 28, 2023
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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.

News & Blog Posts

Blog Post
Jun 29, 2023
DALI Lighting Control: A Sustainable Solution for the Future’s Green Buildings