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MSP430Gxx series MCU selection help

user397859
Prodigy 110 points
Other Parts Discussed in Thread: MSP430G2233

My application need one Capacitive Touch buttom,  three PWM signal, one I2C, which MSP430Gxx series MCU could be selected.

Does MSP430G2233 could achieve these function.

  • 0
    Guru 46710 points
    Three PWM shall be phase-sychronous? What PWM frequency you are looking for? 244Hz ok or not?
  • 0
    Guru 58965 points

    Because you do not need ADC, if G2233 works for you, so would G2203. For that mater, any of the other 6 chips included in the data-sheet of G2233 would work for you too.

    I think it might be difficult to do Capacitive Touch sensing and 3 PWM at the same time with any one of those 7 chip. The Timer0_A3 can only generate 1 PWM and the Timer1_A3 can generate 2 PWM. This means you need to use both Timers to have 3 PWM. Capacitive Touch sensing will need Timer0_A3 CC2, But it Timer0_A3 is in count up to CC0 mode due to PWM, can you still use CC2 for Capacitive Touch sensing?

  • 0 in reply to old_cow_yellow
    Guru 46710 points

    old_cow_yellow said:
    Timer0_A3 is in count up to CC0 mode due to PWM

    To get PWM, you can use continuous mode (count to timer overflow), thus you get CCR0 for PWM output too. That's why I asked question about PWM frequency. 244Hz (16MHz/65536) is more than enough for LED brightness control for instance

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