Microcontrollers are optimised for rechargeable NiMH applications

Optimised for compact industrial equipment requiring battery drive in noisy environments, the ML620130 microcontroller family, has been announced by Lapis Semiconductor, a Rohm Semiconductor company.

The 16bit, low power microcontrollers have ±30kV noise measurement limit, and operating voltage down to 1.6V. The reduced operating voltage extends the supply voltage detection range down to 1.63V (typical), which is very close to the voltage of two nickel metal hydride (NiMH) batteries (0.8V×2=1.6V) – reducing the number of charge cycles and memory effects while prolonging battery life. According to the company, this contributes to decreased battery consumption, and prolongs battery life in portables and battery-equipped industrial equipment.

There are nine models in the family, with a variety of memory capacities and pin counts.

According to the company, the 16MHz CPU and 32MHz (PWM) peripheral clock operations increase performance by a factor of two over Rohm standard lineup of ‘tough’ MCUs. Operating current is reduced by more than 25 per cent compared to typical published values

An on-chip RC-type oscillator is built-in (±1% at -20 degree C to ±85 degree C, ±1.5 per cent at -40 to +105 degree C). UART communication is enabled throughout the entire temperature range without an external oscillator, reducing peripheral component costs. In addition, both full-duplex and half-duplex modes are allowed. In the event that bi-directional communication is not required at the same time, the two receiving terminals and two transmission terminals can be assigned, making it possible to mount on smaller boards.

Noise immunity makes it possible to clear the ±30kV Level 4 measurement limit (air discharge: ±15kV) of the IEC61000-4-2 standard (electrostatic immunity testing standard). Power lines and noise intrusion pathways have been enhanced, and are claimed to result in a 30 per cent improvement in noise resistance.



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