RL78/I1B
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.
Key Features:
| R5F10MMGDFB | R5F10MMEDFB | R5F10MPGDFB | R5F10MPEDFB | ||
|---|---|---|---|---|---|
| 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 | ||||
| Comparators | 2 channels | ||||
| 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:
Block Diagram:
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