# pinout

* [RS232](#rs232)
* [RS485](#rs485)
* [USB3](#usb3)
  * [Type-C](#type-c)
* [PCI-E](#pci-e)
* [HMDI](#hmdi)
  * [19 Pins](#19-pins)
* [Channel](#channel)
* [DVI/HMDI](#dvihmdi)

## I2C

<https://en.wikipedia.org/wiki/I%C2%B2C>

* differential driver: 20-100m

  VCC - 3V–5V GND - GND SDA - Data SCL - Clock

## RS232

[RS232簡單接法(3線)](http://flykof.pixnet.net/blog/post/24074586-rs232%E7%B0%A1%E5%96%AE%E6%8E%A5%E6%B3%95\(3%E7%B7%9A\))\
![](https://pic.pimg.tw/flykof/4a729ba808337.jpg)

## RS485

Line Termination Resistor Calculator: <http://www.alciro.org/tools/RS-485/RS485-resistor-termination-calculator.jsp>

## USB3

VBUS/GND: shared by USB2/3; D-/D+: USB2 only.

![](https://imgur.com/Z8covNr.png)\
<https://en.wikipedia.org/wiki/USB\\_3.0>

![](https://upload.wikimedia.org/wikipedia/commons/8/82/USB_2.0_and_3.0_connectors.svg)

### Type-C

* Receptacles: 12+12 Pins
* Plugs: 12+10 Pins: B6/7 n/a & CC2 -> VCONN

| Pin    | Name            | Description                                         |
| ------ | --------------- | --------------------------------------------------- |
| A1/B12 | GND             | Ground return                                       |
| A2     | SSTXp1 ("TX1+") | SuperSpeed differential pair #1, transmit, positive |
| A3     | SSTXn1 ("TX1−") | SuperSpeed differential pair #1, transmit, negative |
| A4     | VBUS            | Bus power                                           |
| A5     | CC1             | Configuration channel                               |
| A6     | D+              | USB 2.0 differential pair, position 1, positive     |
| A7     | D−              | USB 2.0 differential pair, position 1, negative     |
| A8     | SBU1            | Sideband use (SBU)                                  |
| A9     | VBUS            | Bus power                                           |
| A10    | SSRXn2 ("RX2−") | SuperSpeed differential pair #4, receive, negative  |
| A11    | SSRXp2 ("RX2+") | SuperSpeed differential pair #4, receive, positive  |
| A12    | GND             | Ground return                                       |

## PCI-E

<https://en.wikipedia.org/wiki/PCI\\_Express#Pinout>

```
side A: PRSNT1# shorter than the rest | side B: component side
×1/4/8/16 cards end at pin 18/32/49/82  
+12 V power: 75 W (6-pin) or 150 W (8-pin) | 300 W total (2 × 75 W + 1 × 150 W)
```

![](https://imgur.com/u3rUvyL)

## HDMI

<https://en.wikipedia.org/wiki/HDMI>

| Type | Name       | -       |
| ---- | ---------- | ------- |
| A    | Std        |         |
| C    | Mini       |         |
| D    | Micro      |         |
| E    | Automotive | locking |

### 19 Pins

```
Pin 17	Ground for ARC, CEC, DDC and HEC
Pin 18	+5 V (up to 50 mA)

Pin 1	TMDS data 2 (+)
Pin 2	TMDS data 2 ground
Pin 3	TMDS data 2 (−)

Pin 4	TMDS data 1 (+)
Pin 5	TMDS data 1 ground
Pin 6	TMDS data 1 (−)

Pin 7	TMDS data 0 (+)
Pin 8	TMDS data 0 ground
Pin 9	TMDS data 0 (−)

Pin 10	TMDS clock (+)
Pin 11	TMDS clock ground
Pin 12	TMDS clock (−)

Pin 15	SCL (I2C clock for DDC)
Pin 16	SDA (I2C data for DDC)

Pin 13	CEC / Consumer Electronic Control

Pin 14
        HDMI 1.0–1.3a: Unused
        HDMI 1.4+: ARC (+) or HEC (+)
Pin 19
        All versions: Hot plug detect
        HDMI 1.4+: ARC (−) or HEC (−)
```

## Channel

* Audio Return Channel (ARC): supports stereo PCM
* HDMI Ethernet Channel (HEC): IP-based @ 100 Mbit/s

## DVI/HMDI

DVI: <http://www.alciro.org/alciro/conectores\\_26/conector-DVI-interfaz-visual-digital\\_269\\_en.htm>

```
C1	Red analog	
C2	Green analog	
C3	Blue analog	
C4	Analog horizontal sync	
C5	Ground (analog)	Return for analog signals
```

HDMI to DVI-D: <http://www.alciro.org/alciro/conectores\\_26/patillas-cable-HDMI-a-DVI-D\\_274\\_en.htm>