Forlinx SBC OKMX8MPQ-C, User Manual

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3.4.14 HDMI
One HDMI from P16 is available on carrier board, can support HDMI2.0a up to 4Kp30 and HDMI2.1 eARC,
HDMI circuit contains level transfer circuit, users can take Forlinx circuit for reference
Note :
1. data should be equal with clock, differential impedance 100
Ω
2. HDMI is a hot plug port, please design it with ESD solution, and the chosen material should support HDMI2.0;
3. As 4K resolution is high quality requirement, please use specified cable to connect with the display.
3.4.15 Audio
OKMX8MPQ-C is designed with audio WM8960 for SAI3 on carrier board can support two
speaker output, supports dual track earphone output and one MIC input. It’s designed as a 3.5mm
jack on P32 with CTIA standard, if inserted with OMTP earphone, audio playback and record
maybe get invalid. It can support earphone hot plug detection, when it’s inserted with earphone, it
will take output audio to earphone in priority.
WM8960 is built in with D amplifier up to 1W(8Ω),earphone driver consumption is 40mW(16Ω).
to connect device with larger amplifier, it can only obtain signal from earphone but can not from
speaker.
Note:
1. speaker’s consumption is from D amplifier, but not typical analogy amplifier
2. please don’t use speaker lines or circuit speaker to ground