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Renesas Electronics’ RX21A microcontroller family is the ideal solution for compact electricity meters,
offering compatible and optimized devices for 3-phase and single-phase electricity meter applications.
The RX21A offers 50 MHz MONOS Flash performance, full 1.8 – 3.6 V Flash operation, DSP functions,
seven separate 24-bit ADC modules, RTC, memory protection, AES hardware encryption, temperature
sensor, up to 9 serial communications interfaces, and includes up to 512 Kbytes of Flash memory,
8 kbytes of data Flash and 64 kbytes of on chip SRAM in 64- to 100-pin packages.
In combination with dedicated metrology rmware this all enables the design of compact electricity
meters at lowest investment. The RX21A is supported by a complete suite of tools including software,
debugger, and a meter evaluation platform that allows IEC type tests to be performed.
Applications
●High accuracy electric energy meters
●Power Analyzer
Key Benets
●Full single-chip concept providing flexible software-defined metrology architecture, and application MCU
●True RX family concept that saves software investment thus future-proof
●Integration of dedicated meter features to reduce system cost and to make the design ultra-compact
●Same platform for both single-phase and 3-phase meters to ensure cost effective meter design
●Up to seven separate 24-bit DS ADC modules with PGA to realize featured 3-ph meter
●Factory calibrated variant (G specification) available that allows for super-high < 0.1 % accuracy over a greater than
6600 : 1 dynamic range, plus a 10 ppm/°C bandgap temperature coefficient
●Full RTC with alarm, calibration, binary count mode, and anti-tamper function
●Calibrated temperature sensor to ease adjustments
●Various communication interfaces that allow easy connection of various modems
●Complete metrology firmware provided, enabling the design of precision single and multi-phase e-meters featuring true
single-point calibration, active and reactive power calculation, harmonic content calculation, and energy pulse output generation.
Extended dynamic range and higher accuracy automatically achieved through detection of G specification devices
RX21A Block Diagram
2016.10
RX21A
The Power Analyzer and Electric Energy Meter MCU
COMMUNICATION
MTU2
16-bit 6 ch
TIMERSSYSTEM ANALOG MEMORY
Zero-wait Flash
up to 512 KB
SRAM
up to 64 KB
Data Flash
8 KB
2 x SPI
4 x SCI
2 x I2C
IrDA
7 x 24-bit ADC
7 x 10-bit ADC
Data Mgmt.
DTC/DMA
Interrupt Cont.
16 levels 8 pins
Clock Generation
OSC PLL IRC
POR/LVD
2 x 10-bit DAC
4 x Comp.
2 x TMR
8-bit 2 ch
2 x CMT
16-bit 2ch
WDT
8-bit 1 ch
I-WDT
14-bit 1 ch
RTC
Calendar
Multifunction
Pin Controller
Event Link
Controller
Metering
Tamper, MPU, AES
1 x SCIX
Safety
CAC, DOC, CRC
Temp. Sensor
RX 32-BIT CPU
50 MHZ 78 DMIPS
Digital Signal Processing
MAC 48-bit
Barrel Shifter 32-bit
RMPA 80-bit
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© 2016 Renesas Electronics Europe.
All rights reserved. Printed in Germany.
Before purchasing or using any Renesas Electronics products listed herein, please refer to the latest product manual and/or data sheet in advance.
Key Features
Ordering Information
Pin Count Flash ROM Data Flash RAM Package Part Number
100-pin 512 K 8 K 64 K PLQP0100KB-A (14 x 14 mm, 0.5 mm pitch) R5F521A8BGFP
80-pin 512 K 8 K 64 K PLQP0080KB-A (14 x 14mm, 0.5 mm pitch) R5F521A8BGFN
64-pin 512 K 8 K 64 K PLQP0064KB-A (14 x 14mm, 0.5 mm pitch) R5F521A8BGFM
100-pin 384 K 8 K 64 K PLQP0100KB-A (14 x 14 mm, 0.5 mm pitch) R5F521A7BGFP
80-pin 384 K 8 K 64 K PLQP0080KB-A (14 x 14mm, 0.5 mm pitch) R5F521A7BGFN
64-pin 384 K 8 K 64 K PLQP0064KB-A (14 x 14mm, 0.5 mm pitch) R5F521A7BGFM
Note: The number of available 24-bit ADC modules depends on package (100-pin: 7 modules, 80-pin: 4, 64-pin: 3)
Note: G-specied versions listed here. For less demanding applications a D-specied version including a 256 K Flash/32 K
RAM option is available
Document No. R01PF0055ED0300
RX21A – The Power Analyzer and Electric Energy Meter MCU
32-bit RX CPU core
●Enhanced Harvard Architecture
●50 MHz operating frequency (max.) ~ 165 DMIPS (1.8 – 3.6 V)
●DSP functions (MAC, RMPA, Barrel shifter)
●Memory protection unit (MPU)
Memory Line-up
●256 kbytes to 512 kbytes zero wait-state Flash
●8 kbytes data Flash with background operation (BGO)
function
●32 kbytes to 64 kbytes SRAM
Low-power design and architecture
●1.62 to 5.5 V operation (program and erase)
●200 µA/MHz Operation, all peripherals active
●0.9 µA Deep standby with RTC running
●0.45 µA Standby mode
Optimized System & Peripherals
●System
» 4 channel DMA, Data Transfer Controller (DTC)
» Interrupt Controller
» Power On Reset (POR), Low Voltage Detection (LVD)
» AES Hardware encryption
» 50 MHz High speed oscillator, 125 kHz low speed
oscillator, 32 kHz sub-system oscillator
» Event Link Controller (ELC)
» Safety functions (CAC, DOC, CRC)
●Real-time clock
» Full calendar with leap year; Alarm, calibration,
binary count mode; 3 Time stamps for anti-tamper
●General Purpose Timers
» 6 channel 16-bit MTU2, 2x 2ch 16-bit CMT,
2 x 2ch 8-bit TMR
●Watchdog Timers
» 1 channel 14-bit, 1 channel 8-bit
●Communications
» 5 x SCI (simple SPI, simple I2C), 2 x RSPI interfaces with
CS, 1 x IrDA, 2 x Multi-Master I2C bus interface, GPIO
●Analog functions
» 2.7 to 3.6 V operation
» Up to seven 24-bit ∆Σ ADC channels with PGA
» Up to 85 dB SINAD
» Bandgap with guaranteed 30 ppm/°C temp co.
(typ. 10 ppm/°C for G specification)
» Up to seven channels 10-bit ADC
» 4 channel comparator
» Temperature sensor for measuring temperature within
the chip
Operating temperature range
●-40°C to +105°C (G specification)
●-40°C to +85°C (D specification)
Package line-up
●64-pin to 100-pin
