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Would that mean it is safe for me to use my regulated 5V from my $50 board?
So if there is say at least a 10k resistance between pin 1 and pin 7,
are you saying I don't even need to connect the vcc and the gnd to my augmented micro controller at all, only the tx and the rx?
Hi,Quote from: ErikY on July 17, 2012, 12:25:20 PMSo if there is say at least a 10k resistance between pin 1 and pin 7,NO!If there's very little resitance, say a few Ohm tops (to account for contact error and such - it will be a copper trace if it's there)Quote from: ErikY on July 17, 2012, 12:25:20 PM are you saying I don't even need to connect the vcc and the gnd to my augmented micro controller at all, only the tx and the rx?You always need to connect the ground.
The CP2103 includes an on-chip 5 to 3 V voltage regulator. This allows the CP2103 to be configured as either aUSB bus-powered device or a USB self-powered device. These configurations are shown in Figure 7 and Figure 8.When enabled, the 3 V voltage regulator output appears on the VDD pin and can be used to power external 3 V devices. See Table 9 for the voltage regulator electrical characteristics.
Hi,Quote from: Datasheet_p14The CP2103 includes an on-chip 5 to 3 V voltage regulator. This allows the CP2103 to be configured as either aUSB bus-powered device or a USB self-powered device. These configurations are shown in Figure 7 and Figure 8.When enabled, the 3 V voltage regulator output appears on the VDD pin and can be used to power external 3 V devices. See Table 9 for the voltage regulator electrical characteristics.
He is clearly connecting vcc to the $50 robot micro controller regulated 5v.I am assuming that is because the serial port ? is not self powered like a USB?
And this would mean I can connect my Rx, Tx to my PD0, PD1 respectively, and connect ground to any ground prong available on my sensor/servo bus and I should be good, leaving out the vcc completely, all of course assuming pin 1 and pin 7 are in fact connected?
Hi,Quote from: ErikY on July 17, 2012, 01:50:37 PMHe is clearly connecting vcc to the $50 robot micro controller regulated 5v.I am assuming that is because the serial port ? is not self powered like a USB?Yes. The serial port haven't got a power rail like USBQuote from: ErikY on July 17, 2012, 01:50:37 PMAnd this would mean I can connect my Rx, Tx to my PD0, PD1 respectively, and connect ground to any ground prong available on my sensor/servo bus and I should be good, leaving out the vcc completely, all of course assuming pin 1 and pin 7 are in fact connected?Yes, but connect the ground solidly, either to the nearest ground, or to close to the bttery ground terminal - no wildly flying wires.You may need level converters between the board and the microcontroller - check the I/O levels (as spec'd in the datasheet for your microcontroller).