“RA2A2 devices offer multiple power structures and voltage detection hardware to realise energy-efficient operation as low as 100µA/MHz in active mode, and 0.40µA in software stand-by mode,” according to the company. “An independent power supply real-time clock extends battery life for applications requiring long lifetime management.”
Other features include AES hardware crypto- acceleration, random number generation, ±1.0% on-chip oscillator, temperature sensor, and operation over 1.6 to 5.5V and -40 to +105°C.
The 24bit ΣΔ converter gets its own 10ppm/°C reference and a programmable gain amplifier offering six input spans between ±500mV and ±15.6mV. Various sampling modes are provide between 3.9 and 8.3kHz.
Following this is a phase adjustment circuit, a digital filter and a high-pass filter.
Alongside the high-resolution ADC is a separate multi-input 12bit ADC that can convert in under 1μs, or be run slower to save power. One of the inputs is connected to an on-die temperature sensor.
There are four parts in the group, all with 2x 256kbtye programme flash, 8kbyte data flash and 48kbyte ram.
All come in LQFP packaging, one with 64pads one with 80 and two with 100pads. All get four input channels to the ΣΔ ADC, except one 100pad version which gets seven channels.
An LCD controller is included in all of the MCUs, handling more segments as the packages get larger – up to 45segments x four commons (or 41seg x 8com) in the 100pad device with four ΣΔ channels.
For enhanced operating reliability, various parity, error-correction, self-diagnosis and monitoring circuits are included.
These MCUs are aimed at smart energy management, as well as building automation, medical devices and other applications that can benefit from remote firmware updates.
“Next generation smart electricity meters with non-intrusive load management [will] enable energy consumption monitoring based on detailed analysis of the current and voltage of the total load,” said Renesas.
Find RA2A2 group MCUs thorough this web page. An evaluation kit is available.
