MobileRead Forums - View Single Post

Popup · 10-03-2012, 04:40 AM

I took apart my unresponsive K3 the other day, and measured the battery voltage. To my surprise there was a grand total of 0V between the '+' and '-' terminals!

There was also 2.8V between either of these and either of the SDA/SDC terminals. I'm not a stranger to I²C, and there are typically pull-up resistors on both the data and clock lines, so maybe that shouldn't be so shocking.

So, here are my questions:

Is it normal that there is no voltage whatsoever between the terminals of the battery? (I mean, it could be that there's some kind of I²C handshaking necessary before the battery connects it's cells to the outside world, but it sounds curious.)
Is it normal that the battery/kindle I²C connection works with 2.8V? (I'm more used to 3.3V, but hten I haven't worked with modern consumer electronics, where I understand that all voltages creep downwards.)

10-03-2012, 04:40 AM	#1
Popup Zealot Posts: 102 Karma: 100000 Join Date: May 2011 Device: kindle3, paperwhite-2012, Oasis-2016, paperwhite-2019	K3 battery voltage? (I²C details) I took apart my unresponsive K3 the other day, and measured the battery voltage. To my surprise there was a grand total of 0V between the '+' and '-' terminals! There was also 2.8V between either of these and either of the SDA/SDC terminals. I'm not a stranger to I²C, and there are typically pull-up resistors on both the data and clock lines, so maybe that shouldn't be so shocking. So, here are my questions: Is it normal that there is no voltage whatsoever between the terminals of the battery? (I mean, it could be that there's some kind of I²C handshaking necessary before the battery connects it's cells to the outside world, but it sounds curious.) Is it normal that the battery/kindle I²C connection works with 2.8V? (I'm more used to 3.3V, but hten I haven't worked with modern consumer electronics, where I understand that all voltages creep downwards.)