24-bit ΔΣ A/D converter, RTC backup and high-accuracy oscillator combine to introduce RL78 low power microcontrollers to electricity meter market
RL78/I1B microcontrollers adapt various electricity meter metrologies for different regulations by country and realize the 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 includes the low power ΔΣ A/D converter 0.53mA/ch. RL78/I1B microcontrollers have +/- 1% high-accuracy high-speed on-chip oscillator with +/-0.05% frequency correction function and keep the system robust by the benefit of the accurate on-chip oscillator even when the external oscillator is stopped.
|Memory||CODE FLASH||128 KB||64 KB||128 KB||64 KB|
|RAM||8 KB||6 KB||8 KB||6 KB|
|24-bit ΔΣ A/D Converter||SNDR||～80 dB(x1)|
|Analog input voltage||±0.500 V(x1)|
|Sampling frequency||3.906 kHz/1.953 kHz|
|Programmable gain amplifier||Current channels x1～x32 ・Voltage channels x1～x16|
|Internal refernce voltage||Yes|
|Channels||3 channels||4 channels|
|8/10-bit SAR A/D Converter||Channels||4 channels||6 channels|
|Temperature sensor||1 channel||1 channel|
|LCD Controller/Driver||Segment/Common||30 seg. x 8 com.||38 seg. x 8 com.|
|(32 seg. x 6 com., 34 seg. x 4 com.)||(40 seg. X 6 com., 42 seg. X 4 com.)|
|Method||Internal voltage boosting method / capacitor split method / external resistance division|
|Real time clock||Error correction function||Yes|
|Error correction resolution||0.96 ppm|
|1 Hz output||1 channel|
|Infrared data communication||1 channel|
|Battery backup function (VBAT)||Yes|
|Package||Pin count / package||80 pin LQFP (12mm)||100 pin LQFP (14mm)|
|Current consumption (typ.)||Normal operation||A/D Converter 3 channels|
|RTC backup mode operation||0.66 uA|
Pin Count / Memory Size Lineup:
Below you will find information to support the development of your application.
You can find an explanation of orderable part numbers here.
Resources for Software and Hardware
|My Renesas||Create a My Renesas account to use our tool download services, receive e-newsletter/update notifications, and take advantage of our other services.|
|e-learning||Information for studying and learning about microcontrollers and microprocessors.|
|FAQ||Frequently asked questions and useful hints for development.|
|Forum||A forum and community site to share technical information, questions and opinions with others who use Renesas products.|
|Video||Watch videos related to this product.|
The information contained herein has been provided by a member of Renesas Partners. This information is provided on the Renesas website provided for convenience and informational purposes only. Renesas is not responsible for the contents of this page or any changes or updates to the information posted on this page. Certain links provided herein permit you to leave this site and enter non-Renesas sites. These linked sites are not under control of Renesas. Renesas is not responsible for the contents of any linked site or any changes or updates to such sites. These links are provided for convenience and informational purposes only. The inclusion of any link does not imply endorsement by Renesas of any linked site.
Renesas's Publication of information regarding third-party products or services does not constitute an endorsement regarding the suitability of such products or services or a warranty, representation or endorsement of such products or services either alone or in combination with any of Renesas's product or service.