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|
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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).|
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