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# MSP430F67471A: About Output Current of MSP430F67471A

Part Number: MSP430F67471A

Hello.

I have 3 questions about the content of the datasheet In page of 37, 38.

1.Does the indicated graph show the total value of current that can be output at all pins on the microcomputer?

2.Is there data when Vcc is 3.6 V?

3.If the answer of question 2 is "No", in page of 37, from Figure 5-5, can I assume that only the current close to 0 mA can flow only when the high output is 3 V?

Regards,

uchida-k

• Hello,

Uchida-K said:
1.Does the indicated graph show the total value of current that can be output at all pins on the microcomputer?

No, these plots indicate the output currents versus the output voltages for a single pin (depending on VCC and PxDS.y settings). You can find the maximum total output current from all pins to hold the maximum voltage drop specified in Tables 5-9 and 5-10 in the datasheet.

Uchida-K said:
2.Is there data when Vcc is 3.6 V?

Unfortunately, no. Looking at the differences between Figure 5-3 (VOL, VCC = 3V) and Figure 5-4 (VOL, VCC = 1.8V), I'd assume (no guarantee) that more output current could be sinked before reaching the same output voltage for a higher VCC (assuming the max total output current from all pins hasn't been exceeded).

Uchida-K said:
3.If the answer of question 2 is "No", in page of 37, from Figure 5-5, can I assume that only the current close to 0 mA can flow only when the high output is 3 V?

This means as the pin sources more and more output current, the output voltage will drop as shown. At approximately 0mA, the voltage level would be around 3V.

Regards,

James

MSP Customer Applications

• Hi James,

I understand.

Regards,

uchida-k
• Thanks for letting me know!

Regards,

James

MSP Customer Applications

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