Sony PlayStationPortable, Documentation

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3 HARDWARE OVERVIEW 21
Crystal oscillator 27 MHz
2700L
E52QA
Crystal 4 MHz
[M] 4.00B
Crystal 32.768 KHz
A507Y
3.3 Headphones/Remote Control
The headphone jack is a standard 3.5mm stereo, but there is also a small 6 pin connector next to it for the "remote control" that is
included in the Value Pack. If we assume the following pin numbering (socket in the PSP as viewed from the outside):
Then the pinout is as follows (tip/ring/sleeve refers to the three parts of the stereo jack)
Pin Wire color Function
1 Brown ? Shield ? (GND) - (unused by standard Remote/Headphones)
2 Blue Digital ground (GND)
3 Orange TXD
4 Green Sense? (+2.5V, seems to be controlled by PSP) - (unused by standard Remote/Headphones)
5 Yellow +2.5V (0V when Plug isnt inserted) *1
6 Grey RXD
Tip Pink Left audio (plus 600mv DC BIAS)
Ring Red Right audio
Sleeve Black Audio ground (GND)
*1) If a jack is plugged in and the PSP is on standby, the 2.5V output is always active, regardless of whether the external device
replies to potential PSP queries or not (see below). In other words, when the PSP is on standby, external power is applied indefinitely to
any remote device. This is done so the PSP may be woken up using a PLAY command(
0x0001
) over the serial bus.
If a jack is plugged in and the PSP is turned on, things become interesting:
As soon as the PSP is turned on, voltage on pin 5 drops from +2.5V to 0V for about 0.5 seconds => this provides any external
device plugged onto the remote port with a cold reset, as was previously identified
After this reset phase, +2.5V is turned back on but it is only maintained if the remote device replies to a specific query within 5
secs.
If no proper reply came from the external device within 5 secs, external voltage is turned off, until the PSP itself is powered off in
3.4 Memory Stick