1.3 KiB
1.3 KiB
HDMI Pinout Mapping
This document maps the 19 HDMI pins to the multiplexer channels.
HDMI Type A Connector Pinout
- TMDS Data2+
- TMDS Data2 Shield
- TMDS Data2-
- TMDS Data1+
- TMDS Data1 Shield
- TMDS Data1-
- TMDS Data0+
- TMDS Data0 Shield
- TMDS Data0-
- TMDS Clock+
- TMDS Clock Shield
- TMDS Clock-
- CEC
- Reserved (HEAC+ in 1.4)
- SCL (DDC)
- SDA (DDC)
- DDC/CEC Ground
- +5V Power
- Hot Plug Detect (HEAC- in 1.4)
Multiplexer Mapping (2x CD74HC4067)
We use two 16-channel muxes.
Mux A (High Speed Data)
- Channel 0: Pin 1 (Data2+)
- Channel 1: Pin 3 (Data2-)
- Channel 2: Pin 4 (Data1+)
- Channel 3: Pin 6 (Data1-)
- Channel 4: Pin 7 (Data0+)
- Channel 5: Pin 9 (Data0-)
- Channel 6: Pin 10 (Clock+)
- Channel 7: Pin 12 (Clock-)
Mux B (Control & Power)
- Channel 0: Pin 13 (CEC)
- Channel 1: Pin 14 (Reserved/HEAC+)
- Channel 2: Pin 15 (SCL)
- Channel 3: Pin 16 (SDA)
- Channel 4: Pin 18 (+5V)
- Channel 5: Pin 19 (HPD)
Expected Diode Mode Values (General Guide)
- TMDS Lines (1, 3, 4, 6, 7, 9, 10, 12): 0.3V - 0.7V
- DDC Lines (15, 16): 0.5V - 0.8V
- CEC (13): 0.6V - 0.9V
- +5V (18): Usually high or varies depending on console (check for shorts!)
- HPD (19): 0.6V - 0.9V
Note: Shields (2, 5, 8, 11) and GND (17) should be tied to common ground for the measurement.