Microcontrollers that output high-resolution PWM for fine dimming and toning of LED lighting


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.


Key Features:

Pin Count 20-pin 30-pin 38-pin
Part Name R5F1076xxxSP  R5F107AxxxSP R5F107DxxxSP
I/O Port Total 16 26 34
CMOS I/O 13 23 29
CMOS input 3 3 5
Timer 16-bit timer (TAU) 8 channels (no timer output) 8 channels (timer output: 1, PWM output: 1) 8 channels (timer outputs: 3, PWM outputs 3)
16-bit timer (KB) 2 channels (PWM outputs: 4) 3 channels (PWM outputs: 6)
16-bit timer (KC) 1 channel (PWM outputs: 3) 1 channel (PWM outputs: 6)
Real time clock (RTC) 1 channel (no output) 1 channel (1 output)
8/10-bit A/D converter 6 channels 11 channels
Comparator 4 channels 6 channels
Programmable gain amplifier 1 channel (Input: 4 channels) 1 channel (Input: 7 channels)
Serial interface UART (Supporting LIN-bus and DMX512) 1 channel -
UART (Supporting DALI communication) 1 channel
UART - 1 channel
CSI/UART (Supporting LIN-bus and DMX512): - - 1 channel
I2C bus 1 channel
Vectored interrupt sources 7 external / 27 internal 10 external / 30 internal 11 external / 30 internal
Operating ambient temperature -40 to +105 ℃ (R5F107xxxGSP) / -40 to +125 ℃ (R5F107xxxMSP)

Pin Count / Memory Size Lineup:

Program Flash

  *1 *1

*1 : 3KB available when the self-programing function is used.


Block Diagram:

You can find an explanation of orderable part numbers here.


Resources for Software and Hardware

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Software Design Support

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CS+ This integrated development environment (IDE) can be used for coding, assembly, compiling, and simulation. CS+ is also included with starter kits.
E2 emulator Lite This entry-level on-chip debugging emulator provides functionality equivalent to that of the E1 emulator at a low price.
E2 emulator This on-chip debugging emulator has advanced features that improve the efficiency of development. In addition to the basic functions from debugging to flash programming, this emulator supports hot plug-in and external triggers as standard items. This emulator also helps to reduce development time by downloading at high speeds (compared to the E1 emulator) and the ability to work in combination with various solutions such as the tuning of current drawn by systems under development.
E1 emulator This on-chip debugging emulator is a standard model which provides basic debugging functions (production is to be discontinued at the end of December 2019).


Hardware Design Support

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Characteristics data Information on observed values. Please use this as reference data when developing your set.
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