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If you are using the GPIO connector to drive LEDs, connect the LED outputs to the LED ANODE and connect the LED CATHODE to the ground. If you want to connect another device, then the output is capable of sourcing or sinking up to 3.3V at 24mA, but there is a series resistor of 100Ω in each line.
The GPIO also allows for connecting of external contact closures to the ground. In order to connect a switch, connect one side of the switch to the switch input, and connect the other side to one of the ground pins on the GPIO connector. The connector can also supply 3.3V at up to 500mA to an external device. The 3.3V output is polyfuse-protected and can source up to 500mA.
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The GPIO outputs have 100Ω series resistors; the GPIO inputs have 1K pullup resistors to 3.3V; and the input threshold is 2V high and .8V low. The high voltage is not problematic, but the low voltage can be if there are too many inputs connected to one output. |
1 out driving 1 in | V=3.3*100/(100+1,000)=0.3 |
1 out driving 2 in | V=3.3*100/(100+500)=0.55 |
1 out driving 3 in | V=3.3*100/(100+333.3)=0.76 |
1 out driving 4 in | V=3.3*100/(100+250)=.94 (This is too high, so 1 output driving 3 inputs is the maximum) |
The following table describes the pinout of the GPIO on the XT243 and XT1143:
Pin | Function | Pin | Function |
|---|---|---|---|
1 | GND | 7 | GND |
2 | 3.3V | 8 | 3.3V |
3 | BUTTON 0 | 9 | BUTTON 4 |
4 | BUTTON 1 | 10 | BUTTON 5 |
5 | BUTTON 2 | 11 | BUTTON 6 |
6 | BUTTON 3 | 12 | BUTTON 7 |
The following schematic illustrates the pinout of the GPIO connector.
RJ45 LAN
The XD233 and XD1033 have an RJ45 connector for 1000BASE-T networking. The maximum length for Cat 5E cable is 100 meters; the allowed length can be higher or lower depending on the quality of the cable.
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The XD1033 has two USB 2.0 ports: one Type A and one Type C. The Type A connector can act as a dedicated charging port (DCP) when the two data pins are shorted together, and the Type C connector can operate as either a host or a device (i.e. a dual-role port).
The Type A connector can supply up to 1.5A of power for peripherals, while the Type C connector can supply up to 1A. Note that these values are subject to a total of 2A current for peripherals.
Both ports are capable of transfer speeds up to 480 Mbit/s. The maximum length for a USB cable is 5 meters.
The following table illustrates the pinout of the USB 2.0 Type A host port:
pin | Description | pin | Description |
|---|---|---|---|
1 | VBUS | 2 | D- |
3 | D+ | 4 | Ground |
The following table illustrates the pinout of the USB 2.0 Type C host port:
pin | Signal Name | Description | Mating Sequence | pin | Signal Name | Description | Mating Sequence |
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A1 | GND | Ground return | First | B12 | GND | Ground return | First |
A2 |
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A3 |
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| B10 |
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A4 | VBUS | Bus power | First | B9 | VBUS | Bus power | First |
A5 | CC1 | Configuration channel | Second | B8 |
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A6 | Dp1 | Positive half of USB 2.0 differential pair – position 1 | Second | B7 | Dn2 | Negative half of USB 2.0 differential pair – position 2 | Second |
A7 | Dn1 | Negative half of USB 2.0 differential pair – position 1 | Second | B6 | Dp2 | Positive half of USB 2.0 differential pair – position 2 | Second |
A8 |
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| B5 | CC2 | Configuration channel | Second |
A9 | VBUS | Bus power | First | B4 | VBUS | Bus power | First |
A10 |
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A11 |
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A12 | GND | Ground return | First | B1 | GND | Ground return | First |
3.5mm Audio Connector
The XD233 and XD1033 have a combination analog/optical audio jack. To transmit a digital audio signal, use a TOSLINK optical audio cable with a 3.5mm connector. Analog and digital audio cannot be transmitted simultaneously.
The full-scale voltage output of the analog audio is 2V RMS. The minimum load impedance is 32Ω.
The analog audio connector has the following pinout:
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The following table illustrates the pinout of the HDMI connector:
pin | Description | pin | Description |
|---|---|---|---|
1 | TX2p | 2 | Ground |
3 | TX2n | 4 | TX1p |
5 | Ground | 6 | TX1n |
7 | TX0p | 8 | Ground |
9 | TX0n | 10 | TXCp |
11 | Ground | 12 | TXCn |
13 | CEC | 14 | NC |
15 | DDC SCL | 16 | DDC SDA |
17 | Ground | 18 | +5V DDC |
19 | HPD (Hot Plug Detect) | -- |
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