I was looking at the Arduino Nano's schematic and noticed a resistor that seems to be pointless (RP2C on this picture). Strange resistor RP2C Also there is numbers 6 and 3 on it, does it mean that resistor is connected to pins 6 and 3 on FT232 or to the same pins on Atmega328?
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I have very limited electric knowledge.. I seen on some circuits a small capacitor between VCC and GND (pins 6 and 3), but never a resistor without any other component in between.Michel Keijzers– Michel Keijzers2017年07月03日 14:18:52 +00:00Commented Jul 3, 2017 at 14:18
2 Answers 2
It's an unused element of resistor array RP2. Both ends are grounded in order to reduce noise.
answered Jul 3, 2017 at 14:20
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I get it now, thanks! And numbers represent pins of the resistor array.after– after2017年07月03日 14:43:56 +00:00Commented Jul 3, 2017 at 14:43
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1What noise are you talking about?sa_leinad– sa_leinad2017年07月03日 16:04:03 +00:00Commented Jul 3, 2017 at 16:04
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1en.wikipedia.org/wiki/Johnson%E2%80%93Nyquist_noiseIgnacio Vazquez-Abrams– Ignacio Vazquez-Abrams2017年07月03日 16:47:16 +00:00Commented Jul 3, 2017 at 16:47
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@IgnacioVazquez-Abrams, for better clarity: I think what you mean to say is: "Because this resistor in the array is unused, both ends are grounded in order to reduce noise." Right?Gabriel Staples– Gabriel Staples2018年06月19日 17:37:47 +00:00Commented Jun 19, 2018 at 17:37
The resistor is one of 4 resistors that make up an SMD resistor array, RP2. It is seen on the board here:
Arduino Nano underside
The resistor array works like this:
Resistor array
The resistor on this array is spare, so both terminals are grounded.
answered Jul 3, 2017 at 16:01
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Can you please provide me any link regarding this resistor array,mine got faulty.I need to replace it!S.Das– S.Das2017年09月22日 18:11:36 +00:00Commented Sep 22, 2017 at 18:11
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1The marking says
102so that means each resistor in the array is 1k ohms. The size looks like a 1206 package. Digikey: digikey.com/product-detail/en/panasonic-electronic-components/…, RS/Allied: au.rs-online.com/web/p/array-resistors/5225406, Farnel/Newark/Element14: au.element14.com/vishay/cra06p0831k00jta/…sa_leinad– sa_leinad2017年09月23日 12:08:48 +00:00Commented Sep 23, 2017 at 12:08 -
1Best answer: this part you said is key for my understanding: "The resistor on this array is spare, so both terminals are grounded."Gabriel Staples– Gabriel Staples2018年06月19日 17:42:43 +00:00Commented Jun 19, 2018 at 17:42