Author Topic: Fitbit Charge HR charger pinout  (Read 3242 times)

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Offline 0b01010011

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Fitbit Charge HR charger pinout
« on: December 05, 2016, 05:45:02 am »
Hi guys,

The wife has lost her Fitbit Charge HR charger lead, and has asked me to see if I can at least charge it until she gets another one.

I did do some searching and could not find the pinout - there are some of other Fitbits but seems they all have different charge connectors.  What I am after is the pinout of the one in the attached image, circled in red.  I'm pretty sure one will be 5v and one will be GND.

Thank you...
 

Offline brainwash

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Re: Fitbit Charge HR charger pinout
« Reply #1 on: December 05, 2016, 11:34:07 am »
I normally run a diode test on the device and if I see a conduction path (600mV or so) then it usually means that the polarity is reversed (protection diode). Then I would feed 5V at a very small current (10-20mA) to see if anything breaks.
However a google search shows this: https://community.fitbit.com/t5/Charge-HR/Temporary-USB-charge-lead/td-p/732222
"I just tested my charging cable and if I hold the cable with the bend/notch to the top the left pin is negative and the right is positive according to my voltmeter."

Make sure you current-limit everything before testing.
 

Offline Postal666

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Re: Fitbit Charge HR charger pinout
« Reply #2 on: December 05, 2016, 08:29:50 pm »
Please excuse the crude MS Paint...

Both pins show as short (both directions) in diode mode.

Vcc is 2 Ohms

Hope that helps
 

Offline 0b01010011

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Re: Fitbit Charge HR charger pinout
« Reply #3 on: December 05, 2016, 10:19:10 pm »
Fantastic thanks for the info guys, yes if I didn't get any info I would have tried a current limited PSU at first, but as you suggest brainwash a diode test is a good idea so I'll remember that for the future.

I am guessing the FitBit must have either reverse diode protection or a series diode as minimum as it is possible to 'fudge' the connector backwards, not sure if it makes contact though.

Will give this a try tonight.
 


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