Toshiba Expands Line-up of ARM® Cortex®-M3-based Microcontroller for Smart Meters

TOKYO — (BUSINESS WIRE) — March 11, 2015Toshiba Corporation (TOKYO:6502) today announced the launch of a new microcontroller, “TMPM311CHDUG”, as the latest addition to its ARM® Cortex®-M3-based TX03 series. The microcontroller is designed for smart meter applications. Sample shipments will start in April, with mass production scheduled to start in September, 2015.

Toshiba: ARM(R) Cortex(R)-M3-based microcontroller "TMPM311CHDUG" for smart meters. (Photo: Business ...

Toshiba: ARM(R) Cortex(R)-M3-based microcontroller "TMPM311CHDUG" for smart meters. (Photo: Business Wire)

A power measurement analog front-end (AFE) for single-phase and three-phase smart meters requires simultaneous high-precision current measurement, voltage measurement and power calculation. A 24-bit delta-sigma(∆Σ)-type AD converter incorporated in the new product enables high-precision current measurement, voltage measurement and power calculation at the same time. This ensures the realization of high-end smart meters.

Smart meters
Measuring equipment

Key Features of New Products
-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 %.
-Three-phase power meter solution: Simultaneous current and voltage measurement for up to eight channels is supported by using two units of the microcontroller in an interlocking manner.
-Built-in low-noise variable gain amplifier in each conversion channel of the 24-bit ΔΣ-type AD converter: Enables high-precision measurement for current from a current sensor. This supports both power calculation meter and various sensor equipment.
-Built-in temperature sensor: Enables various temperature corrections.
-In combination with “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 super-low power consumption, “TMPM311CHDUG” can realize a smart meter system that integrates measurement and communication on a board.



Part number   TMPM311CHDUG
Sample price (tax included) 300 yen


  CPU ARM® Cortex®-M3
Maximum frequency 20MHz
Internal memory SRAM 21 Kbytes
Operating voltage 2.7 to 3.6 V
24-bit ∆Σ AD converter

4 ch

• Built-in variable gain amplifier for each channel

Variable gain: x1, x2, x4, x8, x16

• 1 channel is also used as an input of the internal temperature sensor.

μDMA controller 1 unit
16-bit timer 5 ch
Interrupt input 2 ch
SSP 1 ch
Temperature sensor 1 ch
Package LQFP48 (7mm x 7mm, 0.5mm pitch)
Note   DMA: Direct Memory Access
1 Kbyte is calculated as 1024 bytes.

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