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MSP430G2230 with external reference?

HS FAE Germany
Mastermind 30485 points
Other Parts Discussed in Thread: MSP430G2230

Hello,
can the MSP430G2230 be used with an external reference? It is described in the datasheet page 29 ("10-Bit ADC, External Reference (MSP430G2230 Only)(1)") but I think the pins are missing. I think VCC can be used as external ref. Right?

If the internal ref is used, what happend if
- ADC input voltage > VCC?
 eg. ADC ch = 3.0V, Vref=2.5V, what this damage the ICß

Regards, Holger

  • 0
    TI__Guru**** 202106 points
    Hello Holger,

    This seems to be a mistake in the MSP430G22x0 datasheet as there is indeed no VEREF+ pin on the MSP430G2230, I will ask the documentation team for confirmation. Otherwise the ADC input voltage can exceed the internal voltage reference of 2.5 V without damaging the IC (readings will clip at 1023) so long as the voltage in question does not exceed the power supply voltage at DVCC.

    Regards,
    Ryan
  • 0 in reply to Ryan Brown1
    TI__Mastermind 30485 points

    may be the information are in the d/s if the VCC is used as a ref?

    Regards, Holger

  • 0 in reply to HS FAE Germany
    TI__Guru**** 202106 points
    The response I received from the Documentation Team is as follows:

    It should be updated on next version as below:

    P1.3/ADC10CLK/VREF-/VEREF-/A3
    P1.4/TA0.2/SMCLK/A4/VREF+/VEREF+

    According to this question, ADC reference supports both internal and external controlled by SREFx bits.

    SREFx Bits 15-13 Select reference.
    000 VR+ = VCC and VR- = VSS
    001 VR+ = VREF+ and VR- = VSS
    010 VR+ = VeREF+ and VR- = VSS. Devices with VeREF+ only.
    011 VR+ = Buffered VeREF+ and VR- = VSS. Devices with VeREF+ pin only.
    100 VR+ = VCC and VR- = VREF-/ VeREF-. Devices with VeREF- pin only.
    101 VR+ = VREF+ and VR- = VREF-/ VeREF-. Devices with VeREF+/- pins only.
    110 VR+ = VeREF+ and VR- = VREF-/ VeREF-. Devices with VeREF+/- pins only.
    111 VR+ = Buffered VeREF+ and VR- = VREF-/ VeREF-. Devices with VeREF+/- pins only.

    Regards,
    Ryan
  • 0 in reply to Ryan Brown1
    TI__Mastermind 30485 points

    Hello Ryan,
    it is not completely clear, P1.3 and P1.4 are not available on MSP430G2230.

    Regards, Holger

  • 0 in reply to HS FAE Germany
    TI__Guru**** 202106 points
    You are correct Holger, I have requested for further details/information.

    Regards,
    Ryan
  • 0 in reply to Ryan Brown1
    TI__Guru**** 202106 points
    Hi Holger,

    It has now been confirmed that the F2230/2210 does not support external ADC inputs, the ADC external info will be removed from the datasheet. Thank you for finding and reporting this documentation error.

    Regards,
    Ryan

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