Typically, smart meter controllers consist of an electricity calculation unit that measures current and voltage, a communication control unit that transmits and receives data using external equipment, and a display unit that sends information to the display.
On the circuit board
Toshibas new microcontroller allows independent control of the measurement and communication units on one chip and reduces board space using two Cortex-M4F cores with a maximum operation frequency of 80MHz.
It also features the security functions that are essential for network communications advanced encryption standard (AES), secure hash algorithm (SHA) and exponentiated subgradient algorithm (ESG) plus tamper detection and power failure detection with super-low consumption power.
Other features include the protection of software data in each unit. Date backup, real-time clock (RTC) operation and interrupt/tamper detection can all be operated in standby mode.
As well as smart meters, the microcontroller can also be applied to devices with sensing and communication functions; in other words, the Internet of Things (IoT).
The TMPM411F20XBG has a sample price of 1,500 yen, or approximately GBP8.70.
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