8-bit MCUs with integrated dimming

20 FEBRUARY 2009

The 14 new 8-bit all flash microcontrollers of the 78K0/lx2-family from NEC Electronics, designed specifically for fluorescent and LED lighting applications, enable a significant reduction in system and energy costs. Gleichmann Electronics will present these devices for the first time in Hall 9, Stand 235 at embedded world 2009. Among other things, the MCUs are equipped with up to two 16-bit PWM timers, which enable a precise PWM control in 65536 steps. An especially powerful oscillator, which allows control of the two integrated timers with a maximum of 40 MHz, hereby guarantees a fine-grained inverter control. Furthermore, both of the integrated timers are each capable of generating two non-overlapping outputs so that also four-channel LEDs with precise dimming and color control can be driven by a single MCU. In practice, one of the 16-bit PWM timers is used for control of the power factor cosj (PFC). For a reliable protection against over-current or under-voltage, comparators with outputs linked directly to the PWM timer were integrated on the chips. Thus, if needed, the PWM output is immediately shut down without intervention of the CPU.

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