Toshiba TMPM311CHDUG microcontroller for smart meters

Toshiba has announced the microcontroller TMPM311CHDUG as the latest addition to its ARM Cortex-M3-based TX03 series. The microcontroller is designed for smart meter applications.

The product’s built-in, four-channel, 24-bit, ΔΣ-type AD converter measures current and voltage simultaneously, with high precision. The allowance for measurement error of single-phase power calculation is within 0.1%. A built-in, low-noise variable gain amplifier in each conversion channel of the converter enables high-precision measurement for current from a current sensor, supporting both a power calculation meter and various sensor equipment.

The three-phase power meter solution supports simultaneous current and voltage measurement for up to eight channels by using two units of the microcontroller in an interlocking manner. A built-in temperature sensor meanwhile enables various temperature corrections.

In combination with the TMPM411F20 - which incorporates two Cortex-M4F cores and performs measurement and communication controls on one chip, and enables tamper detection in the power failure and interrupt detection for measurement and communications at low power consumption - the microcontroller can realise a smart meter system that integrates measurement and communication on a board.