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:
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