Battery - Revision history

Somline: →Intro changed -

2010-09-19T07:58:35Z

→Intro changed -

Somline at 06:59, 19 September 2010

2010-09-19T06:59:20Z

Somline at 06:54, 19 September 2010

2010-09-19T06:54:31Z

Somline at 06:42, 19 September 2010

2010-09-19T06:42:44Z

Somline: /* Intro */

2010-09-19T06:24:34Z

Intro

Somline: /* Chip inside the battery */

2010-09-19T06:23:37Z

Chip inside the battery

Somline: /* Chip inside the battery */

2010-09-19T06:22:02Z

Chip inside the battery

Somline: /* Interface used by WebOS */

2010-09-19T06:21:44Z

Interface used by WebOS

Somline: /* Interface used by WebOS */

2010-09-19T06:21:23Z

Interface used by WebOS

Somline: New page: Here I will describe how the chip inside the battery of pre and pixi works. I used this information for the app Dr.Battery.
This is just the start. I'm still working on it.

==I...

2010-09-19T06:09:59Z

New page: Here I will describe how the chip inside the battery of pre and pixi works. I used this information for the app Dr.Battery. This is just the start. I'm still working on it. ==I...

New page

Here I will describe how the chip inside the battery of pre and pixi works. I used this information for the app Dr.Battery. 
This is just the start. I'm still working on it. 
==Intro==
The Pre and the Pixi are using the same battery. The battery includes a chip providing WebOS with all information about the condition of the battery. 
The battery communicates with the operating system through a "A 1-Wire® interface". 
The chip also includes a nonvolatile storage. All needed informations are stored within this storage. WebOS doesn't store any information about the battery on the device.

==Chip inside the battery==
The battery is using the "Dallas Semiconductor Maxim DS2784 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1". 
The manual of the chip can be found here: [http://datasheets.maxim-ic.com/en/ds/DS2784.pdf Manual of the DS2784]

==Interface used by WebOS==
The communication with the battery is done by the kernel device driver "w1_ds2784.c" written by palm. 
At boottime webOS creates a directory structure in "/sys/devices/w1_bus_master1" with character device files. 
An application is able to read and write to and from the battery through these "files".

@@ Line 1: / Line 1: @@
-Here I will describe how the chip inside the battery of pre and pixi works. I used this information for the app Dr.Battery.<br>
+Here we want to describe how the chip inside the battery of pre and pixi works. This info was used to build the app Dr.Battery.<br>
-This is just the start. I'm still working on it.<br><br>
+This is just the start and needs to get completed<br><br>
 ==Intro==
 The Pre and the Pixi are using the same battery. The battery includes a chip providing WebOS with all information about the condition of the battery.<br>

← Older revision		Revision as of 06:59, 19 September 2010
Line 38:		Line 38:

	==Third party batteries==		==Third party batteries==
		+
		+	==Experiences with calibrating by the app Dr.Battery==

	==Threads at "precentral" regarding the characteristics of the battery==		==Threads at "precentral" regarding the characteristics of the battery==

@@ Line 31: / Line 31: @@
 ==Registers accessible trough the interface==
-==Aging Estimation vs. Calibration==
+==Reading and writing from/to the registers==
 ==Third party batteries==

← Older revision		Revision as of 06:42, 19 September 2010
Line 28:		Line 28:
	At boottime webOS creates a directory structure in "/sys/devices/w1_bus_master1" with character device files.<br>		At boottime webOS creates a directory structure in "/sys/devices/w1_bus_master1" with character device files.<br>
	An application is able to read and write to and from the battery through these "files".		An application is able to read and write to and from the battery through these "files".
		+
		+	==Registers accessible trough the interface==
		+
		+	==Aging Estimation vs. Calibration==
		+
		+	==Third party batteries==

@@ Line 3: / Line 3: @@
 ==Intro==
 The Pre and the Pixi are using the same battery. The battery includes a chip providing WebOS with all information about the condition of the battery.<br>
-The battery communicates with the operating system through a "A 1-Wire® interface".<br>
+The battery communicates with the operating system through a "Dallas 1-Wire® interface".<br>
 The chip also includes a nonvolatile storage. All needed informations are stored within this storage. WebOS doesn't store any information about the battery on the device.

@@ Line 18: / Line 18: @@
 <li>Programmable Safety Thresholds for Overvoltage and Overcurrent</li>
 <li>Authentication Using SHA-1 Algorithm and 64-Bit Secret</li>
-<li>32-Byte Parameter EEPROM  16-Byte User EEPROM  Dallas 1-Wire Interface with 64-Bit Unique ID</li>
+<li>32-Byte Parameter EEPROM</li>
 <li>Tiny, Pb-Free, 14-Pin TDFN Package Embeds Easily in Battery Packs Using Thin Prismatic Cells</li>
 </ul>

@@ Line 9: / Line 9: @@
 The battery is using the "Dallas Semiconductor Maxim DS2784 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1".<br>
 The manual of the chip can be found here: [http://datasheets.maxim-ic.com/en/ds/DS2784.pdf Manual of the DS2784]
 ==Interface used by WebOS==

← Older revision		Revision as of 06:21, 19 September 2010
Line 14:		Line 14:
	At boottime webOS creates a directory structure in "/sys/devices/w1_bus_master1" with character device files.<br>		At boottime webOS creates a directory structure in "/sys/devices/w1_bus_master1" with character device files.<br>
	An application is able to read and write to and from the battery through these "files".		An application is able to read and write to and from the battery through these "files".
−	~~Features of the chip taken from the manual:<ul>~~
−	~~<li>Precision Voltage, Temperature, and Current Measurement System</li>~~
−	~~<li>Available Capacity Estimated from Coulomb Count, Discharge Rate, Temperature, and Cell Characteristics</li>~~
−	~~<li>Estimates Cell Aging Using Learn Cycles</li>~~
−	~~<li>Uses Low-Cost Sense Resistor</li>~~
−	~~<li>Allows for Calibration of Gain and Temperature Coefficient</li>~~
−	~~<li>Li+ Safety Circuitry—Overvoltage, Undervoltage, Overcurrent, Short-Circuit Protection</li>~~
−	~~<li>Programmable Safety Thresholds for Overvoltage and Overcurrent</li>~~
−	~~<li>Authentication Using SHA-1 Algorithm and 64-Bit Secret</li>~~
−	~~<li>32-Byte Parameter EEPROM  16-Byte User EEPROM  Dallas 1-Wire Interface with 64-Bit Unique ID</li>~~
−	~~<li>Tiny, Pb-Free, 14-Pin TDFN Package Embeds Easily in Battery Packs Using Thin Prismatic Cells</li>~~
−	~~</ul>~~

Battery - Revision history

Somline: →Intro changed -

Somline at 06:59, 19 September 2010

Somline at 06:54, 19 September 2010

Somline at 06:42, 19 September 2010

Somline: /* Intro */

Somline: /* Chip inside the battery */

Somline: /* Chip inside the battery */

Somline: /* Interface used by WebOS */

Somline: /* Interface used by WebOS */

Somline: New page: Here I will describe how the chip inside the battery of pre and pixi works. I used this information for the app Dr.Battery. This is just the start. I'm still working on it. ==I...

Somline: New page: Here I will describe how the chip inside the battery of pre and pixi works. I used this information for the app Dr.Battery.
This is just the start. I'm still working on it.

==I...