pin | I/O | label | description | remark
:--- | :--- | :--- | :--- | :---
1|-|GND|ground|
2|I/O|I2CSCL|I²C clock|(pulled up by camera)
3|I/O|I2CSDA|I²C data|(pulled up by camera)
4|-|GND|ground|
5|I|BATTIN|battery input|
6|I|BATTIN|battery input|
7|O|3V8OUT|unregulated power out 3.8V|0V when camera is off.
8|O|3V8STBY|unregulated power out 3.8V|always keep 3.8V unless battery is out.
9|I|BPRDY|bacpac ready|set low I²C EEPROM to be read by camera. (pulled up by camera)
10|I|VSYNC|3D genlock vertical sync|[LCD touch bacpac only: pulled up. set low to sleep LCD touch bacpac]
11|-|PIN11||[LCD touch bacpac only: low on audio ready]
12|-|PIN12||[LCD touch bacpac only: high on video ready]
13|-|PIN13||
14|I|TRIG|3D sync trigger|
15|I|I2CINT|I²C interrupt|read request from slave. (pulled up by camera)
16|I|AUDIOIN_L|left mic in|impedance 2.2k, reserved power bias 3.3V, unbalanced
17|I|AUDIOIN_R|right mic in|impedance 2.2k, reserved power bias 3.3V, unbalanced
18|-|PIN18|[LCD touch bacpac only: playback button]|(pulled up by camera)
19|I|PWRBTN|power/mode button|(pulled up by camera)
20|I|HSYNC|3D genlock horizontal sync|[LCD touch bacpac only: left audio out]
21|-|PIN21||[LCD touch bacpac only: right audio out]
22|-|GND|ground|
23|I/O|USB_D−|USB D−|
24|I/O|USB_D+|USB D+|
25|-|USB_VBUS|USB VBUS|charging camera battery through this pin is not possible.
26|-|USB_VBUS|USB VBUS|charging camera battery through this pin is not possible.
27|-|PIN27||
28|O|HBUSRDY|high on Herobus ready|
29|O|VIDEO|composite video out|
30|-|GND|ground|