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
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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
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