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I have been using a SparkFun BlueSMiRF module with a MSP430G2553 chip on a breadboard. I want to create a custom circuit to have everything on one board.

Here are a few questions before I go about this:

  1. Can I connect the Tx and Rx lines from the RN42 directly to the MSP430 without the level shifting circuits since the MSP430 runs on 3.3v as well?
  2. Can I leave the RTS and CTS connections on the RN42 floating since I will only be using 9600 bps?
  3. I have a Vcc of 3.3V, so I will be removing the voltage regulator circuit at the top left. (Not really a question, but if I'm doing something wrong here, hopefully someone will point it out).

(SparkFun schematics: http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Wireless/Bluetooth/BlueSMiRF-Gold-ChipAnt-v1_rotat2.pdf)

Thanks for reading!

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  1. Yes - but don't forget to connect MSP430 Tx to RN42 Rx, and vice versa.
  2. Yes - but you should pull CTS low, or loop it back into RTS via SJ1.
  3. OK.
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  • \$\begingroup\$ Thanks for the reply. Would there be a difference between pulling CTS low and shorting it with RTS? \$\endgroup\$ – user2218339 Nov 22 '13 at 2:28
  • \$\begingroup\$ Not really, but the jumper's there so you may as well use it. \$\endgroup\$ – markt Nov 22 '13 at 4:18

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