Pogo Pins Schematic

Question

I have a Galaxy Nexus phone which has pogo pins: enter image description here

I have determined which pins are PWR and GND but I don't know what the third pin is. I assume it is for the dock feature of the phone so it knows that it has been inserted into a dock. I'm not sure if I should just apply another 5V to it, put it to ground, or what because I can't find an schematics online for it.

Any ideas?

Those are not spring loaded, so I'd call those contacts for pogo pins in the dock to mate with, rather than pogo pins themselves. — Chris Stratton, Feb 04 '14 at 05:40

score 8 · Accepted Answer · answered Dec 07 '12 at 05:14

The middle pin is the "sense" pogo pin in the Galaxy Nexus: The phone sends out a 100 millisecond pulse on this pin, then waits for three pulsed responses, to sense what it has been connected to.

From board-tuna-pogo.c:

/* The below constants are in milliseconds */
#define POGO_WAKE_PERIOD                100
#define POGO_ID_PERIOD_TIMEOUT          750
#define POGO_ID_DESKDOCK                50
#define POGO_ID_CARDOCK                 100
#define POGO_ID_CHARGER                 50
#define POGO_ID_USB                     100
#define POGO_ID_AUDIO                   50
#define POGO_ID_NO_AUDIO                100
#define POGO_ENTER_SPDIF_WAIT_PERIOD    100
#define POGO_ID_PERIOD_TOLERANCE        20
#define POGO_DET_DEBOUNCE               80

The three response pulses expected are:

POGO_ID_DESKDOCK or POGO_ID_CARDOCK
POGO_ID_CHARGER or POGO_ID_USB
POGO_ID_AUDIO or POGO_ID_NO_AUDIO

Pogo Pins Schematic

1 Answers1