BrightSign Compact
This information applies to a product under development. Its characteristics and specifications are subject to change without notice. Roku assumes no
obligation regarding future manufacturing unless otherwise agreed to in writing.
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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.
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.
