A standard USB Mini B normally only has 4 wires connected (+5V, 0V/Gnd, and 2 x Data Wires). The Nuvi has a 5th Pin (Pin 5 or Pin 'X') which it uses to sense what type of Cable is connected, and controls the charging current.Quote:
Originally Posted by carputer [Only registered and activated users can see links. Click Here To Register...]
Inside the Nuvi there will be a resistor connected to the +5V rail and the other end connected to the ID Sensor and Pin 5 (or pin 'X' as it otherwise referred to as).
External to the Nuvi this wire (white) will connect to a Resistor of about 18K ohm in value, and the other end of the resistor to Gnd/Ov.
These 2 resistance values (1 internal, the other external, via the cable), for a 'potential divider' such that changing the resitance of the externalk Resistor, changes the voltage to the ID Sensor pin inside the Garmin Nuvi.
As stated the Garmin Nuvi USB Mini B socket has a Cable ID circuit n Pin 5 (or Pin 'X').
There will no doubt be an internal resistor from the +5V rail to that ID Pin on the Min B USB, and external Resistor (18k Ohm) to Ground (Ov) completes the poential divider and the Voltage on that Cable ID Detect
I learned of this website from a Arvin on RoadGui9de.ph:-
[Only registered and activated users can see links. Click Here To Register...] as has been quated here.
Here is my reply to that pinouts.ru website:-
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Because I was using a Garmin Nuvi 255 in a wether resistant handlebar mount case, on my motorcycle, powered from a 12V Power outlet (marine version CIGAR LIGHTER SOCKET with waterproof cap), I did not want to use a standard USB A to USB- Mini B, as this causes it to go into Data Mode, then after 20 seconds it will finally go into GPS Navigation mode.
Sure the Garmin 12V PSU worked OK (but it sticks out rather far, and was prone to vibrating loose and power lost to Nuvi and I would have to push it back down to re-seat it, before the 15 sec count down to Power-Off.
I have since found I can tip the 12V Socket into a more vertical position, so less of a problem.
Regardless. running the Garmin Nuvi off a Dual USB Charger and a custom Cable with 90 Degree USB Min B (having 5P, with 18K resistor off that Pin5 (or Pin 'X'), gets it detected as a PSU Cable, is a cheaper alternative to buying a genuine Garmin 12V Charger (US$25 typically)
Some USB Mini B 5 have a 200K Ohm resistor to ground already fitted. I soldered a 20K Ohm in parallel to get a Garmin Nuvi accptable value to detect as Power Cable.
CDR King have low cost USB 12V Chargers:-
Quote:
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USB Car Charger Adapter(Dual Power Output)
Php 100.00
Quote:
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USB CAR Charger Adapter (Dual Power Output)
Php 150.00
New Arrival
USB1 - 2.1A
USB2 - 1.0A
Seems CDR King have a new (cheaper) white version of that SBC-10 2000mAh Battery /Solar Charger
Quote:
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2000mAh Solar Charger
Php 480.00 (Php100 less than the SBC-10)
New Arrival
Can be charged on the Sun Or PC/Laptop
Polished case and LED power meter
Suitable for mobile phones, iPhone, iPad, Camera, MP3/MP4, PDZ, NDS, PSP and other gadgets
LED torchlight and charging indicator
Specifications:
Solar panel: 0.55W
Built-in Li-on rechargeable battery (3.7V/2000mAh)
Light distance: 3 meters
Charging times:
Sunlight: 9 ~10hrs
PC/Laptop: 3 ~4hrs
Mobile phone: 1 ~2hrs
Size: 100mm x 60mm x 15mm
3pcs. mobile connectors
Package Contents:
1 x Solar Charge (2000mAh)
3 x Mobile connectors
1 x Mobile connector cable
1 x Manual
Can be charged on the Sun Or PC/Laptop
Polished case and LED power meter
Suitable for mobile phones, iPhone, iPad, Camera, MP3/MP4, PDZ, NDS, PSP and other gadgets
LED torchlight and charging indicator
Specifications:
Solar panel: 0.55W
Built-in Li-on rechargeable battery (3.7V/2000mAh)
Light distance: 3 meters
Charging times:
Sunlight: 9 ~10hrs
PC/Laptop: 3 ~4hrs
Mobile phone: 1 ~2hrs
Size: 100mm x 60mm x 15mm
3pcs. mobile connectors
Package Contents:
1 x Solar Charge (2000mAh)
3 x Mobile connectors
1 x Mobile connector cable
1 x Manual
It seems to have all the features of the SBC-10 (unless I am missing something?), but is white color and Php100 less!
It still comes with the multi-Tip Connectors also
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It is fairly easy to add a 20k Ohm Resistor in parallel with the 200K Ohm one fitted inside the USB Mini B 'Tip'.
I also cut the plastic case at 45 Degree and inverted one half amd using superglu to join them into 90 Degree Connector
(Filling with Epoxy resin/car body filler to make it stronger if required, once confirmed working).
The only problem is the DC Plug Lead of the Multi-Tip is rather short!
Most USB - DC Power cables are to a DC Plug not socket!
So how about this, as a possible 'fix' to that problem - solder a USB cable of the required length, in place of the solders DC Power 'protrusion'!
For those not so good at DIY and soldering, and want to buy something costing less than a genuine Garmin 12V PSU check this out on eBAY:-
For those with motorcycles, perhaps ands not having a 12V Power Outlet (Cigar Lighter Socket) there is this alternative to genuine Garmin wired supply:-Quote:
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US $9.75
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Quote:
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US $15.50
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