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MSP430F2274-EP: What is the minimum VCC for a calibrated 8MHz internal DCO clock?

Part Number: MSP430F2274-EP
Other Parts Discussed in Thread: MSP430F2274

Hello,

What is the minimum VCC required to run the MSP430F2274 at a calibrated 8MHz frequency? I've been looking at the datasheet and it appears to give conflicting information. Figure 1 (pasted below) suggests the minimum VCC is greater than 2.2V. However, the DCO frequency table (also pasted below) lists the minimum VCC as 1.8V. So which is it? On top of that, errata problem CPU45 suggests increasing the minimum VCC by 200mV to work around the problem, but since I don't know the minimum VCC for 8MHz, I also don't know what 200mV above that value is. I would appreciate any clarification.

Thanks

Figure 1 Image:

DCO Frequency Table:

  • Hello,

    adevries said:
    What is the minimum VCC required to run the MSP430F2274 at a calibrated 8MHz frequency?

    The operating area in that Figure 1 does not show reaching 8 MHz system clock unless you have Vcc > 2.2V. The listing for DCO table that has minimum Vcc of 1.8V is considering a wide range of frequencies. You have to read it with the minimum system frequency of operation. The RSELx=13 that you highlighted starts at 6 MHz. So if you need 8 MHz minimum frequency, I think you will need to use the minimum of 2.2V.

    Srinivas

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