RN8209 can measure active power, reactive power, active energy and reactive energy, and can  provide two-channel independent active power and RMS, voltage RMS, line frequency, zero-crossing interrupt, etc. to achieve flexible anti-tampering solutions.

RN8209 supports all-digital gain, phase and offset calibration, with the active and reactive energy pulses respectively output from the pins of PF and QF.

RN8209D provides two serial interfaces SPI and UART, to facilitate communication with the external MCU.RN8209C provides only one serial interfaces UART, and the baud rate is fixed at 4800bps.

The internal power supply monitoring circuit of RN8209 can ensure reliable operation of the chip when power on and off.

 Features

1.Measurement

n Three channels of Σ-△ ADC are provided.

n The active energy accuracy is less than 0.1% (< 0.1%) over a dynamic range of 8000:1 with the 

2.IEC62053-22: 2003 Standard supported.

n The reactive energy accuracy is less than 0.1% (< 0.1%) over a dynamic range of 8000:1 with 

the IEC62053-23: 2003 Standard supported.

n Two-channel current and one-channel voltage RMS is provided, with the RMS accuracy <0.1% 

3.over the 1000:1 dynamic range.

n One pulse frequency generator which can be used for user-defined power electrical energy 

accumulation points.

n Provide instantaneous sample values of the three-way ADC.

n No-load threshold is adjustable.

n Reverse active power indication is provided.

n Provide voltage channel frequency measurement.

n Provide voltage channel zero-crossing detection.

n Reference baseline monitoring function

4.Software meter calibration

n The meter constant (HFConst) is adjustable.

n Gain and phase calibration is provided.

n Offset calibration is provided for active, reactive and RMS.

n Acceleration is provided for small-signal meter calibration.

n Automatic checksum is provided for configuration parameters.

5.SPI /UART interfaces are provided

6.Power supply monitoring is provided

7.Energy registers have timed freeze function

8.UART's RX input pin along with pin reset function

9.RN8209 + 5V / 3.3V power supply, the power consumption is typically 15mW @ 5V, 8mW @ 3.3V

10.Built-in 1.25V ± 1% reference voltage, with typical temperature coefficient of 5ppm / ℃,

11.SSOP24 lead-free package is adopted for RN8209D, SOP16 lead-free package is adopted for 

RN8209C.