WebOS Internals - User contributions [en]

Battery

2010-09-19T07:58:35Z

Somline: →Intro changed -

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. 
This is just the start and needs to get completed 
==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 "Dallas 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]
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</li>
<li>16-Byte User EEPROM</li>
<li>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>

==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".

==Registers accessible trough the interface==

==Reading and writing from/to the registers==

==Manufacturer Rating (full40)==

==Aging Estimation vs. Calibration (age)==

==Third party batteries==

==Experiences with calibrating by the app Dr.Battery==

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

User:Somline

2010-09-19T07:18:00Z

Somline: →user Intro -

==My Introduction==
I hade huge problems with my battery. The runtime of the device was very bad. I always wondered about the drain(%) others where reporting. 
So I searched the logfiles, in the filesystem and the kernel to find the source of the problems. 
By doing this I started a thread [http://forums.precentral.net/palm-pre/256967-find-out-how-good-bad-your-battery.html Find out how good/bad your battery is] in precentral about my findings. 
With the help of the community we where able to understand a lot of the battery and found a way to recalibrate it. 
Finally I build the app [http://forums.precentral.net/homebrew-apps/260947-dr-battery.html Dr.Battery] to have an easy way to analyze and recalibrate the battery. 
With the nice help of Rod Whitby I distributed the sources into the WebOS Internals git repository. 
I started a wiki in the Hardware section with an detailed explanation about how the battery in the pre and pixi works, and how Dr.Battery is using this info.

Battery

2010-09-19T06:59:20Z

Somline:

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 "Dallas 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]
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</li>
<li>16-Byte User EEPROM</li>
<li>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>

==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".

==Registers accessible trough the interface==

==Reading and writing from/to the registers==

==Manufacturer Rating (full40)==

==Aging Estimation vs. Calibration (age)==

==Third party batteries==

==Experiences with calibrating by the app Dr.Battery==

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

Battery

2010-09-19T06:54:31Z

Somline:

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 "Dallas 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]
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</li>
<li>16-Byte User EEPROM</li>
<li>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>

==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".

==Registers accessible trough the interface==

==Reading and writing from/to the registers==

==Manufacturer Rating (full40)==

==Aging Estimation vs. Calibration (age)==

==Third party batteries==

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

Battery

2010-09-19T06:42:44Z

Somline:

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 "Dallas 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]
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</li>
<li>16-Byte User EEPROM</li>
<li>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>

==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".

==Registers accessible trough the interface==

==Aging Estimation vs. Calibration==

==Third party batteries==

Battery

2010-09-19T06:24:34Z

Somline: /* Intro */

Battery

2010-09-19T06:23:37Z

Somline: /* Chip inside the battery */

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]
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</li>
<li>16-Byte User EEPROM</li>
<li>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>

==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".

Battery

2010-09-19T06:22:02Z

Somline: /* Chip inside the battery */

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]
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>

==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".

Battery

2010-09-19T06:21:44Z

Somline: /* Interface used by WebOS */

Battery

2010-09-19T06:21:23Z

Somline: /* Interface used by WebOS */

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".
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

2010-09-19T06:09:59Z

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...

Portal:Hardware

2010-09-19T05:44:56Z

Somline: Section Battery added to category hardware

__notoc__
{{portal-header|
Just list everything related to the hardware. 
Title pages: '''Hardware [description]'''
}}
'''[[:Category:Hardware|All pages in Category:Hardware]]'''

* [[External Battery Pack]]
* [[A2dp]]
* [[Accelerometer]]
* [[Ambient Light Sensor]]
* [[Bluetooth Research]]
* [[GPS]]
* [[Hardware]]
* [[Hardware issues]]
* [[IR Proximity Sensor]]
* [[Controlling LEDs from the Shell|LEDS: Control from the shell]]
* [[More on Leds|LEDS: More information]]
* [[OMAP vibration device|OMAP vibration device]]
* [[Torch/Flash|Torch/Flash]]
* [[USB]]
* [[WLAN|WLAN / WIFI]]
* [[Touchscreen]]
* [[Camera]]
* [[Battery]]

File:Drbattery calibrate.png

2010-09-19T05:06:40Z

Somline: Screenshot2 Dr.Battery Calibrate Scene

Screenshot2 Dr.Battery Calibrate Scene

File:Drbattery health.png

2010-09-19T05:05:48Z

Somline: Screenshot1 Dr.Battery Health Scene

Screenshot1 Dr.Battery Health Scene

File:Icon drbattery.png

2010-09-19T05:04:12Z

Somline: Icon of Dr.Battery

Icon of Dr.Battery