Pinout

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Multi-use port

PSVita - Multi-use port cable to USB

PSVita - Dock Multi-use connector to USB

PSVita - Multi-use port internals to USB
Pin Signal
1 another voltage input?
2 another voltage input?
3 GND
4 audio output
5 audio output
6 I/O?
7 I/O?
8 I/O?
9 I/O?
10  ?
11 headset control GND
12 headset control data / mic?
13 I/O?
14 GND?
15 I/O?
16 GND?
17 +5V charge input
18 +5V charge input
19 GND
20 USB D-
21 USB D+

Accessory Port

Pin Signal

EHCI

The accessory port found only on the original Vita models is a custom port USB interface. The port must be activated in software and so far, there does not seem to be any official public software that uses it. As of firmware 1.69, all APIs that reference the accessory port are permanently disabled. The only documented usage of this port is from an FCC filing for the PDEL-1001 development unit. It seems that some dongle attached to the device is used as part of their hardware testing framework.