LSx22 Hardware Interfaces

10 min

HDMI Output

The LS422 has a single HDMI® connector that is compliant with HDMI 1.3 A/V standards. It is capable of outputting 1080i and 720p video resolutions.

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)	--

3.5mm Stereo Connectors

The LS322 and LS422 have a 3.5mm stereo connector for variable analog audio output. The full-scale voltage output of the audio is 2V RMS. The minimum load impedance of the audio connector is 32Ω.

The audio connector has the following pinout:

Tip: Left audio
Ring: Right audio
Base: Ground for audio signal

SPDIF (TOSLink) Connector

The LS322 and LS422 have a SPDIF connector capable of outputting 16-bit, 48 kHz (AC3 5.1 encoded) stereo audio streams. Muting this connector produces digital silence.

USB Host Ports

The LS322 and LS422 each have a single USB 2.0 host port capable of providing 500mA of power. Each port also supports HID, and devices can be hot swapped without the need to reboot.

The following table illustrates the pinout of the USB host port:

Pin	Description	Pin	Description
1	VBUS	2	D-
3	D+	4	Ground

DA15 GPIO

The LS322 and LS422 have a DA15 female switch/led connector. This connector allows the player to control external LEDs or other devices requiring 24mA of current or less.

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 connector also allows the 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 DA15 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.

If one BrightSign player is driving the inputs on another BrightSign player, then you can drive at most three inputs from one output. The following calculations explain this limitation:

The GPIO outputs have 100Ω series resistors; the GPIO inputs have 1K pullup resistors to 3.3V; and the input threshold on the 541 chips 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 the maximum is one output driving three inputs)

The following table illustrates the pinout of the DA15 on LS players:

Pin	Description	Pin	Description
1	IR blaster input	2	Ground
3	Button 6 I/O	4	Button 5 I/O
5	Button 3 I/O	6	Ground
7	Button 1 I/O	8	+3.3V output at 500mA
9	Ground	10	Button 7 I/O
11	Ground	12	Button 4 I/O
13	Button 2 I/O	14	Ground
15	Button 0 I/O	--	--

Here is the DA15 female connector as viewed from the front:

A button/LED/IR board can be used to demonstrate the GPIO and IR functions on a BrightSign player. This board is built by a third-party manufacturer and can be purchased upon request.

RJ45 Ethernet

The LS322 and LS422 have a single 10/100 RJ45 port for networking. The maximum length for the Ethernet cable is 100 meters. The following table illustrates the pinout of the RJ45:

Pin	Description	Pin	Description
1	TX+	2	TX-
3	RX+	4	RC to ground
5	RC to ground	6	RX-
7	RC to ground	8	RC to ground

SD Port

The LS322 and LS422 have a card slot that supports SD, SDHC, and SDXC cards. It is capable of streaming video at 25Mbps or streaming three stereo PCM audio tracks simultaneously.

On-Board LEDs

LS322 and LS422 have a single red LED located on the side of the device to indicate that the power is on.