Roku BrightSign Compact
Hardware Guide
PCBA: C
Version: .1
Saratoga, CA, USA
1
Table of Contents
OVERVIEW ..................................................................................................................................... 3
PORTS .......................................................................................................................................... 5
POWER CONNECTOR..................................................................................................................... 5
DB9 RS232 CONNECTOR .............................................................................................................. 5
DB15 SWITCH/LED CONNECTOR ................................................................................................... 6
ETHERNET .................................................................................................................................... 9
USB............................................................................................................................................. 9
DB15 VGA CONNECTOR................................................................................................................ 9
TRIPLE RCA COMPONENT HD VIDEO CONNECTOR.......................................................................... 9
1/8” AUDIO CONNECTORS ............................................................................................................ 10
HDMI CONNECTOR...................................................................................................................... 10
5V SERIAL CONNECTOR............................................................................................................... 10
POWER USAGE ........................................................................................................................... 11
ENVIRONMENTAL ....................................................................................................................... 11
MECHANICAL............................................................................................................................... 12
THEORY OF OPERATION........................................................................................................... 13
POWER SUPPLY .......................................................................................................................... 13
RESET ........................................................................................................................................ 13
PNX8935 CPU........................................................................................................................... 13
BUILT IN FLASH............................................................................................................................ 13
SDRAM ..................................................................................................................................... 13
SERIAL PORT .............................................................................................................................. 13
VIDEO ENCODER AND FILTER ....................................................................................................... 13
HDMI ENCODER.......................................................................................................................... 14
AUDIO OUTPUTS .......................................................................................................................... 14
ON BOARD LEDS ........................................................................................................................ 14
ON BOARD SWITCH ..................................................................................................................... 14
RESET SWITCH/GPIO BUTTON: .................................................................................................... 14
SDHC & SD FLASH SLOT............................................................................................................ 14
NAND FLASH .............................................................................................................................. 15
ETHERNET .................................................................................................................................. 15
USB........................................................................................................................................... 15
APPENDIX A................................................................................................................................. 16
FLOW CHART: (FOR REPAIR CENTER USE) ........................................................................... 16
(1) POWER START ....................................................................................................................... 16
(2) POWER LED COMES ON, NO SERIAL PORT OUTPUT................................................................... 17
GENERAL TROUBLESHOOTING NOTES:................................................................................. 19
1) •VTT (1.25V) SHOULD BE HALF OF VDD (2.5V).................................................................... 19
2
BrightSign Compact
Overview
This hardware reference manual specifies the hardware interfaces on the Brightsign Compact, as well as
providing a guide to troubleshoot the hardware of the Brightsign Compact for in-field service. This
manual will not describe any software functions.
The Brightsign Compact is a device that can be used to drive a variety of HDTV and computer monitors
for digital sign and kiosk applications. As well as driving the Video Display, the Compact has many
different control interfaces built in to allow the sign to be controlled.
There are several different models of Brightsign Compact that Roku sells. This hardware manual will
document all the features on the Compact, even though certain models of the Compact may not have
every feature. For example, only some models of the Compact have the Ethernet interface. Brightsign
This information applies to a product under development. Its characteristics and specifications are subject to change without notice. Roku assume s no
obligation regarding future manufacturing unless otherwise agreed to in writing. www.rokulabs.com
© Roku 2008
BrightSign Compact
Compact Block Diagram
This information applies to a product under development. Its characteristics and specifications are subject to change without notice. Roku assume s no
obligation regarding future manufacturing unless otherwise agreed to in writing. www.rokulabs.com
© Roku 2008
BrightSign Compact
Ports
On back of the unit:
Power plug for 5V power input at 3A
10/100 Ethernet jack
HDMI connector
Triple RCA jacks for Component Hi-Def output (Y-Pr-Pb).
DB15 VGA video connector.
Stereo 1/8” mini plugs for audio output
On the side of the unit:
USB connector
GPIO button
Reset button
On front of the unit:
SD & SDHC flash card slot
Green Flash Activity LED
Green Power LED
Red Status/Err LED
Yellow Upgrade LED
DA15 Female for GPIO, IR in & out, and 3.3V power.
DB9 Male RS232
1/8” serial connector (0-5V serial)
Note: Unless otherwise specified, Roku recommends that all cable lengths be 10 Meters or less. The
customer may be able to use longer cables in specific cases, but the customer must test the cable to see if
it will work. Generally higher quality cables with lower capacitances can be run longer than cheaper
cables.
Power Connector
The power connector on our board is rated at 5V @ 3A. The plug to go into our connector is standard
5.5MM plug, center positive, with a 1.65MM center pin hole. The power is over voltage protected and
reverse polarity protected with two 5W 6V zener diodes. Note that we actually supply our board with
5.2V in order to meet the HDMI specification, but we will refer to this voltage in this document as 5V.
DB9 RS232 connector
RS232 connector is a male DB9. The HD2000 is a DTE device (like a PC). The input to our chip accepts
up to +25V and -25V, so it is compatible with standard +12 and -12 volt signaling. The output of our chip
is rated at +5.4V and -5.4V typical which exceeds the voltage required by the RS232 specification.
The baud rate is 115,200, No parity, 8 data bits, 1 stop bit. No hardware or software flow control.
Maximum cable length is 50 Meters, total cable capacitance 2500pF (using lower capacitance cable
allows longer than 50 Meters). The TX and RX signal will look like this:
This information applies to a product under development. Its characteristics and specifications are subject to change without notice. Roku assume s no
obligation regarding future manufacturing unless otherwise agreed to in writing. www.rokulabs.com
© Roku 2008
BrightSign Compact
The pinout of the DB9 on the REVB HD2000 board is as follows (NC=No Connect):
pin Description pin Description
1 NC 2 Receive data into HD2000
3 Transmit data out of
4 Available 5V @ 500mA
HD2000
5 Ground 6 NC
7 Optional TX 2nd channel 8 Optional RX 2nd channel
9 NC
DB15 Switch/LED connector
The Switch/Led connector is a DB15 Female. This connector is used to allow the Compact to control
external LEDs or other devices requiring 24mA of current or less. Connect the LED outputs to the LED
ANODE and connect LED CATHODE to ground. If you want to connect up some other device then the
output is capable of sourcing or sinking up to 24mA at 3.3V, but we do have a series resistor of 100 Ohms
in each line. This connector also allows connecting up external contact closures to ground. In order to
connect a switch, connect one side of the switch to the switch input, and connect the other side of the
switch to one of the ground pins on the DB25 connector. Finally 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 a Brightsign is driving the inputs on another Brightsign, then you can at most drive 3 inputs from 1
output. Calculations follow showing why this is:
The GPIO outputs have 100 Ohm series resistors, the 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 a problem, but the low
voltage can be if there are too many inputs connected to 1 output.
Here are the calculations:
1 out driving 1 in: V=3.3*100/(100+1000)=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)=0.94 (Too high, so we can only let 1 output drive 3 inputs
MAX!)
This information applies to a product under development. Its characteristics and specifications are subject to change without notice. Roku assume s no
obligation regarding future manufacturing unless otherwise agreed to in writing. www.rokulabs.com
© Roku 2008
BrightSign Compact
The DB15 female has the following pinout:
pin Description pin Description
1 IR Blaster output 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 @ 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
DA15 female as viewed from the back of Brightsign Compact:
Roku makes a button/LED/IR board that can be used to demonstrate how the GPIO and IR works. Here is
the schematic to that board as an example of how to connect things to the GPIO connector:
This information applies to a product under development. Its characteristics and specifications are subject to change without notice. Roku assume s no
obligation regarding future manufacturing unless otherwise agreed to in writing. www.rokulabs.com
© Roku 2008
BrightSign Compact
In this example schematic, we are using a Vishay TSOP39338 IR receiver, which can operate properly on
3.3V. The TSOP39138 will also work. We are using a Honeywell SEP8506-003 IR Diode as the IR
blaster output.
This information applies to a product under development. Its characteristics and specifications are subject to change without notice. Roku assume s no
obligation regarding future manufacturing unless otherwise agreed to in writing. www.rokulabs.com
© Roku 2008
BrightSign Compact
Ethernet
The Brightsign Compact has a standard RJ45 connector for 10/100 base T Ethernet. Maximum cable
length is 100 Meters. The pinout of the RJ45 is as follows:
pin Description pin Description
1 TX+ 2 TX3 RX+ 4 RC to ground
5 RC to ground 6 RX
7 RC to ground 8 RC to ground
USB
The Brightsign Compact has a high speed (480 mbit) USB host port. Maximum cable length is 5 Meters.
The port has the following pinout:
pin Description pin Description
1 VBUS 2 D3 D+ 4 Ground
DB15 VGA connector
The VGA connector is able to output RGB video. The connector has the following pinout:
pin Description pin Description
1 RED analog video output 2 GREEN analog video output
3 BLUE analog video output 4 NC
5 Digital ground 6 Analog ground
7 Analog ground 8 Analog ground
9 +5V DDC supply 10 Digital ground
11 NC 12 DDC SDA
13 HSYNC output 14 VSYNC output
15 DDC SCL
Triple RCA Component HD video connector
The component triple RCA connector is a able to output the following formats:
480P video: Y from Green jack, Pr from Red jack, and Pb from Blue jack.
720P video: Y from Green jack, Pr from Red jack, and Pb from Blue jack.
This information applies to a product under development. Its characteristics and specifications are subject to change without notice. Roku assume s no
obligation regarding future manufacturing unless otherwise agreed to in writing. www.rokulabs.com
© Roku 2008
BrightSign Compact
1080i video: Y from Green jack, Pr from Red jack, and Pb from Blue jack.
1/8” Audio connectors
The Brightsign Compact has one 1/8” female audio connectors. The connector has a stereo audio signal.
The full scale voltage output of the audio is 2V RMS, with no load. The minimum load resistance that
should be connected to the audio output is 5K Ohms. The connector is NOT capable of driving
headphones directly. If you need to drive headphones, look into our Brightsign Expander module, which
can drive 3 sets of 5 Ohm headphones directly.
The audio connector has the following pinout:
Tip: Left audio
Ring: Right audio
Base: Ground for audio signal
HDMI connector
The HDMI connector is used to send digital video and audio to HDMI enabled sink devices. This is 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) 20 Ground
5V Serial connector
The HD2000 has a single 1/8” female connector 5V serial access. This port is used to communicate with
devices that require 0 and 5V serial signaling.
This connector has the following pinout:
Tip: Receive data
Ring: Transmit data
Base: Ground
This information applies to a product under development. Its characteristics and specifications are subject to change without notice. Roku assume s no
obligation regarding future manufacturing unless otherwise agreed to in writing. www.rokulabs.com
© Roku 2008
BrightSign Compact
Power usage
The power supply on the Brightsign Compact is a 15W 5.2V @ 3A power supply. The Brightsign
Compact will use approximately 1A of power when playing a 720p or 1080i MPEG2 HD source file. 1A
at 5.2V is about 5W.
This implies that there is 2A of additional available power that can be used by peripherals connected to
the Brightsign Compact. The user should not connect up any combination of peripherals that will exceed
2A draw. If more than 2A is drawn, then the external power supply will shut down due to overcurrent
conditions. The unit will not be damaged, but it may cause the unit to reboot or to not operate properly
until the overload is removed.
This 2A can be shared any way you like on the following connectors.
Ethernet – About 180mA when transferring data
USB – 1500mA max (USB spec is 500mA, but we decided to put out more current on the USB connector
just like some PCs do, in order to be able to use the Brightsign Expander in some cases without an
additional 5V power supply).
DB9 5V – 500mA
DB25 3.3V – 500mA
HDMI 5V – 55mA max
Each of 6 LED outputs on DB25 – up to 24mA each
IR Blaster output – Up to 24mA
Environmental
The Brightsign Compact is designed to be used between the temperatures of 0 to 40C with 90% maximum
relative humidity, non-condensing.
This information applies to a product under development. Its characteristics and specifications are subject to change without notice. Roku assume s no
obligation regarding future manufacturing unless otherwise agreed to in writing. www.rokulabs.com
© Roku 2008
BrightSign Compact
Mechanical
This information applies to a product under development. Its characteristics and specifications are subject to change without notice. Roku assume s no
obligation regarding future manufacturing unless otherwise agreed to in writing. www.rokulabs.com
© Roku 2008
BrightSign Compact
Theory of operation
Power Supply
The Brightsign Compact has a five voltages present. These are 5V, 3.3V, 2.5V, 1.8Vand 1.2V. 5V
comes in from the power connector and is used directly for USB, the video filter chip.. 3.3V is created
from 5V by a Semtech SC196 switching regulator. Similar regulators are used to create 2.5V for the DDR
SDRAM, 1.8V for the HDMI chip, and 1.2V for the PNX8935 core voltage.
Reset
The Brightsign Compact has a Low Voltage Reset circuit made up of a ADM809SAKS. This circuit will
hold the RESET_L signal low until a valid 3.3V power is present.
PNX8935 CPU
The Brightsign Compact has a Philips PNX8935 Multimedia CPU in it. This CPU runs on 3.3V, 2.5V,
and 1.2V. The PNX8935 runs from a 27MHz oscillator. The PNX8935 is reset by the signal RESET_L
from the low voltage reset circuit going into the RESET_IN pin on the PNX8935. When the RESET_IN
pin goes from low to high, then the PNX8935 will boot from NAND flash.
Built in Flash
The HD2000 contains 3 flash devices. The boot code in the PNX8935 instructs the PNX8935 to continue
the boot process by reading additional code from the on board NAND flash. This flash can be updated in
the field, either from on the flash slots or USB mass storage. Part of the NAND flash is also used to hold
non-volatile parameters. The contents of the boot flash is copied into the SDRAM, then the PNX8935
jumps to the boot code. There is also a serial settings flash that can be used to contain non-volatile
settings. The last flash is the Ethernet flash that is used to configure the Ethernet PHY chip.
SDRAM
The HD2000 contains four DDR SDRAM devices. When the PNX8935 boots, it will copy the code from
the NAND flash device into SDRAM, and then execute the code from SDRAM. The SDRAM runs at
clock rate 200MHz, with data rate 400MHz.
Serial Port
The Brightsign Compact has a built in UART that that communicates with the RS232 level shifter. The
MAX232 creates valid RS232 voltage levels for the transmit pin by using a capacitive voltage switcher.
Video Encoder and Filter
The PNX8935 streams decoded video out of the QVCP5L digital port using single data rate clock, and it
also streams the same video out of the on board DACs. Analog video comes out of the PNX8935 and is
connected to the FMS6203 video filter chip. This chip has a programmable cutoff frequency of either
8MHz, 16MHz or 32MHz, or no filter. Since the video filter has a low impedance output, we can drive
both VGA and COMPONENT 75Ohm terminated cables at the same time with no degradation (with the
This information applies to a product under development. Its characteristics and specifications are subject to change without notice. Roku assume s no
obligation regarding future manufacturing unless otherwise agreed to in writing. www.rokulabs.com
© Roku 2008
same signal). Some VGA monitors will sync at 720p and 1080i, so only in this case can a picture be
displayed on both component and VGA at the same time.
BrightSign Compact
HDMI encoder
The QVCP5L video is also sent over to the TDA9984B HDMI encoder chip, which drives the HDMI data
out of the Brightsign Compact. The HDMI chip is also connected to I2S audio and SPDIF audio, so that
audio will be driven out the HDMI connector. The TDA9984A is capable of upscaling video to 1080P.
Audio outputs
The Brightsign Compact has a single AK4420 high quality audio DAC device. This device take in digital
audio signals from the PNX8935 for I2S audio. The AUD_LRCIN signal is the framing signal for the
audio, running at the frame rate of the audio source. The frame rate is usually either 44.1KHz or 48KHz.
AUD_BITCLK signal is typically 64 times higher than AUD_LRCIN. The AUD_MCLK is usually 4
times faster than the AUD_BITCLK signal. The I2S audio is also routed to the HDMI chip.
The audio output from the AK4420 DAC is sent directly to the audio output jack. The AK4420 can drive
a 5K load with a 2V RMS signal.
On Board LEDs
There are 4 on board LEDs, as follows:
Green Flash Activity LED, one anytime the SD card is being accessed.
Green Power LED, is on any time the board is powered up and not in reset.
Yellow Upgrade LED, flashes when the board is being upgraded.
Red Status/Err LED
On Board Switch
The on board switch is connected to a GPIO32. There is a pullup on the button so that GPIO32 is high
normally, and it is pulled low when the button is pressed.
Reset switch/GPIO button:
The on board reset switch is connected to GPIO12. Pressing the reset button down will make GPIO12 go
low. If you hold the reset button low for approximately 10 seconds, then the board will be hard reset.
When the board goes into reset, then the power LED will go out until the reset button is released.
SDHC & SD Flash Slot
The SDHC & SD flash slot supports SHDC and SD flash cards. Power is controlled by internal mosfets
inside the SMSC USB2250 USB Flash controller chip.
This information applies to a product under development. Its characteristics and specifications are subject to change without notice. Roku assume s no
obligation regarding future manufacturing unless otherwise agreed to in writing. www.rokulabs.com
© Roku 2008
BrightSign Compact
NAND flash
The HD2000 has a built in NAND flash. All the code for the unit is stored on the NAND flash, and it may
also be possible to store some content on the NAND flash. The NAND flash is connected to the PCI/XIO
bus on the PNX8950.
Ethernet
10/100 Base T Ethernet is implemented on the HD2000 by a Realtek RTL8100C PHY controller. This
device takes the PNX8950 Ethernet signals and converts them to the differential Ethernet signals. The
PHY chip is also connected to an on-board Ethernet magnetic and a RJ45 for cable termination. The
DM9161 chip is able to signal to the PNX8950 that its state has changed by toggling the INT_ETH line,
which is connected to GPIO11.
USB
The USB 2.0 High speed host controller is implemented internally inside the PNX8935 SOC chip. There
is also a dual over-current protected switch TPS2069 device, which is used to turn on and off power to the
USB device, and to detect over-current situations.
This information applies to a product under development. Its characteristics and specifications are subject to change without notice. Roku assume s no
obligation regarding future manufacturing unless otherwise agreed to in writing. www.rokulabs.com
© Roku 2008
BrightSign Compact
Appendix A
Flow Chart: (for Repair Center Use)
(1) Power Start
No LEDs
on
Is the Output power
adapter 5V DC
Is the Voltage of
L2 = 5V?
No
?
No
Check D12 & D33
Replace Power
Adapter
for shorts
Yes
Is the Voltage of
TP16 3.3V?
No
L3, C204
Check U17,
Yes
Check U33,
Reset circuit U36,
R76, D5
This information applies to a product under development. Its characteristics and specifications are subject to change without notice. Roku assume s no
obligation regarding future manufacturing unless otherwise agreed to in writing. www.rokulabs.com
© Roku 2008
BrightSign Compact
(2) Power LED comes on, no serial port output
port output
Is there 2.5V DC at
Is there 1.2V DC
Is there 16MHz at
Is RESET_L high at
pin 1 of U15 after
Yes
Is SYS_RES_OUT_N
high at C188 after
Yes
No serial
TP18?
at TP20?
Yes
TP7?
Yes
powerup?
powerup?
Check U25
for good
program and
good solder
joints, check
SDRAM
No
No
Check U18, L5, C212
Check U20, L6, C223
Check U3,
No
Y3, C186, C187,
R134, Nand flash
U25
No
Check U15,
U36, S2
No
Check U3
Check nand
contents U25,
check nand bus,
check sdram
This information applies to a product under development. Its characteristics and specifications are subject to change without notice. Roku assume s no
obligation regarding future manufacturing unless otherwise agreed to in writing. www.rokulabs.com
© Roku 2008
BrightSign Compact
(3) Power LED comes on, Red led is out, unit is booting.
Serial port tests are in order. Connect a PC to the HD2000 using a null modem cable (Wire up 2-3, 3-2, 5-
5). Set the terminal program to 115200,N,8,1. In order to see all boot messages, hold S1 down while
powering the unit on or while using S2 to reset the unit.
A) If the serial port is not working, then check U6 and P4.
B) Use the “dir” command to test reading the SD flash card. Use “dir USB1:” and “dir USB2:”
command to test reading from external USB mass storage devices. If the SD card fails to read,
check U12 and the SD socket, and associated resistors. If the USB mass storage reads fail, check
U30, U32, and P9.
C) Use the “videoplay” command to test the video and audio outputs, for example “videoplay
test.mp3” or “videoplay test.mpg”. If the analog audio fails to work, check U1. Check for the
audio master clock on R7, should be 11.288MHz or 12.288MHz. Check for audio bit clock R9,
should be ¼ of the MCLK. Check for LRCLK on R11, should be 44.1KHz or 48KHz. Check for
audio data on R13. Check passives on outputs of U1. The voltage output of the audio during this
test (fullscale) is 2V RMS, with no load. Check AUD_AVCC5V power supply.
D) Connect a Roku Brightsign Compact Test board to the DA15. Run the following script to test the
LEDs. If any LED fails to come on, then check U8, U9, U10, U11 and the resistors on the outputs
of these.
[TBD: Need GPIO LED script for Compact inserted here]
E) Connect a Roku Brightsign Compact Test board to the DA15. Run the following script to test the
buttons on the test board. Press each button and the screen should show which button is pressed. a
led should blink on and off several ight for each button pressed. If any switch fails to read, or is
stuck on, then check U7 as well as the resistors and beads on the inputs to U7. This script will test
the side panel switch as well as the switches connected to the DA15.
[TBD: Need GPIO button script for Compact inserted here]
F) Connect a Ethernet cable to a switch. Exit the shell by typing “exit” and return. Now type
“ifconfig eth0 192.168.1.21” (Use an unused address on your network). The switch should show
link on, and you should be able to ping the unit and ping other things on your network. If this does
not work, check U5, Y1, T1, P3 and associated passives.
This information applies to a product under development. Its characteristics and specifications are subject to change without notice. Roku assume s no
obligation regarding future manufacturing unless otherwise agreed to in writing. www.rokulabs.com
© Roku 2008
BrightSign Compact
General troubleshooting notes:
1) •VTT (1.25V) should be half of VDD (2.5V)
This information applies to a product under development. Its characteristics and specifications are subject to change without notice. Roku assume s no
obligation regarding future manufacturing unless otherwise agreed to in writing. www.rokulabs.com
© Roku 2008
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