A three-phase power meter needs to deal with more current and voltage information compared to a single-phase power meter and requires analog input for a maximum of seven channels and high processing capacity for power calculation. Further, the smart power meter needs to meet the security requirements of the Device Language Message Specification (DLMS) international standard.

Renesas offers microcontrollers (MCUs) for three-phase power meters equipped with optimum analog input structure and calculation support functions.

The 32-bit CPU RX21A microcontroller is equipped with an up to 7-channel 24-bit Delta-Sigma A/D converter, AES encryption engine and 1.56 DMIPS/MHz processing performance suitable for high-end three-phase power meters.

The 16-bit CPU RL78/I1C microcontroller is equipped with an up to 4-channel 24-bit Delta-Sigma A/D converter, a phase adjustment function, a high pass filter, and a 32-bit multiply-accumulator, making it suitable for low-end three-phase power meters. In addition, it is equipped with an encryption/decryption processing hardware engine that supports AES encryption GCM mode to support DLMS standard security requirements.

The three-phase 4-wire power meter can be supported by linking a 4-channel Delta-Sigma A/D converter and a 3-channel sequential A/D converter with the event link controller.

Three-phase Power Meter

 

Documentation & Downloads

Title Other Languages Type Format File Size Date
Application Notes & White Papers
RX21A Group 日本語 Application Note PDF 585 KB
RX210, RX21A, and RX220 Groups Power Line Frequency (50/60 Hz) Discrimination 日本語 Application Note PDF 266 KB
RX21A Group Transition to Low Power Consumption Modes 日本語 Application Note PDF 343 KB
RX21A Group Asynchronous Communication Using the SCI 日本語 Application Note PDF 392 KB
RX21A Group Delta-sigma A/D Converter User's Guide 日本語 Application Note PDF 968 KB
RX21A Group Example Settings for Simultaneous Conversion on Seven Channels of 24-Bit Delta-sigma A/D Converter 日本語 Application Note PDF 377 KB
Downloads
- RX21A Group Initial Setting 日本語 Sample Code ZIP 620 KB
- RX210, RX21A, and RX220 Groups Power Line Frequency (50/60 Hz) Discrimination 日本語 Sample Code ZIP 433 KB
- RX21A Group Transition to Low Power Consumption Modes 日本語 Sample Code ZIP 517 KB
- RX21A Group Asynchronous Communication Using the SCI 日本語 Sample Code ZIP 581 KB
- RX21A グループ 24 ビットΔΣA/D コンバータ 7 チャネル同時変換設定例 Sample Code ZIP 731 KB