IC has pull-down resistors on SMBus lines? The Next CEO of Stack OverflowMOSFET and clamp on I2C interface lines as level tranlastorSMBus with AVR?i2C : pull-up resistors “design pattern”, Shielded cable and connector?I2C protocol debugging using oscilloscopePS2 / SMBus communicationDoes SMBus spec lie about I2C?If a datasheet doesn't state I2C address pins have pull-up/down resistors, does that mean I must connect them?I2C device lists 20mA max current on AD, CL, and DA pins. Do I need a resistor between it and Arduino?SMBus Address and BaudRateSMBus v1.1 voltage threshhold value
What day is it again?
Is dried pee considered dirt?
Would a grinding machine be a simple and workable propulsion system for an interplanetary spacecraft?
Physiological effects of huge anime eyes
Why don't programming languages automatically manage the synchronous/asynchronous problem?
Is there a reasonable and studied concept of reduction between regular languages?
Traveling with my 5 year old daughter (as the father) without the mother from Germany to Mexico
What difference does it make using sed with/without whitespaces?
Why the last AS PATH item always is `I` or `?`?
Expressing the idea of having a very busy time
IC has pull-down resistors on SMBus lines?
From jafe to El-Guest
Are the names of these months realistic?
TikZ: How to fill area with a special pattern?
what's the use of '% to gdp' type of variables?
Computationally populating tables with probability data
How to set page number in right side in chapter title page?
What flight has the highest ratio of timezone difference to flight time?
Is it convenient to ask the journal's editor for two additional days to complete a review?
Is it correct to say moon starry nights?
Iterate through multiline string line by line
Players Circumventing the limitations of Wish
What is the difference between "hamstring tendon" and "common hamstring tendon"?
Yu-Gi-Oh cards in Python 3
IC has pull-down resistors on SMBus lines?
The Next CEO of Stack OverflowMOSFET and clamp on I2C interface lines as level tranlastorSMBus with AVR?i2C : pull-up resistors “design pattern”, Shielded cable and connector?I2C protocol debugging using oscilloscopePS2 / SMBus communicationDoes SMBus spec lie about I2C?If a datasheet doesn't state I2C address pins have pull-up/down resistors, does that mean I must connect them?I2C device lists 20mA max current on AD, CL, and DA pins. Do I need a resistor between it and Arduino?SMBus Address and BaudRateSMBus v1.1 voltage threshhold value
$begingroup$
The datasheet of TI bq40z50-R2 (Li-Ion Battery Pack Manager) tells that "The SMBus clock and data lines have internal pulldown".
Pin equivalent Diagram is in image below:
Aren't usually the SMBus Data and Clock lines to be connected to pull-up resistors?
I'd like to connect this IC and a Battery Charger IC to same SMBus, but the latter requires pull-up resistors for the SMBus lines.
Would this work anyway?
Thanks
i2c smbus
asked 2 hours ago
haku15haku15
726
$endgroup$
add a comment |
$begingroup$
The datasheet of TI bq40z50-R2 (Li-Ion Battery Pack Manager) tells that "The SMBus clock and data lines have internal pulldown".
Pin equivalent Diagram is in image below:
Aren't usually the SMBus Data and Clock lines to be connected to pull-up resistors?
I'd like to connect this IC and a Battery Charger IC to same SMBus, but the latter requires pull-up resistors for the SMBus lines.
Would this work anyway?
Thanks
i2c smbus
asked 2 hours ago
haku15haku15
726
$endgroup$
add a comment |
$begingroup$
The datasheet of TI bq40z50-R2 (Li-Ion Battery Pack Manager) tells that "The SMBus clock and data lines have internal pulldown".
Pin equivalent Diagram is in image below:
Aren't usually the SMBus Data and Clock lines to be connected to pull-up resistors?
I'd like to connect this IC and a Battery Charger IC to same SMBus, but the latter requires pull-up resistors for the SMBus lines.
Would this work anyway?
Thanks
i2c smbus
asked 2 hours ago
haku15haku15
726
$endgroup$
The datasheet of TI bq40z50-R2 (Li-Ion Battery Pack Manager) tells that "The SMBus clock and data lines have internal pulldown".
Pin equivalent Diagram is in image below:
Aren't usually the SMBus Data and Clock lines to be connected to pull-up resistors?
I'd like to connect this IC and a Battery Charger IC to same SMBus, but the latter requires pull-up resistors for the SMBus lines.
Would this work anyway?
Thanks
i2c smbus
i2c smbus
asked 2 hours ago
haku15haku15
726
asked 2 hours ago
haku15haku15
726
asked 2 hours ago
haku15haku15
726
asked 2 hours ago
haku15haku15
726
asked 2 hours ago
haku15haku15
726
726
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
$begingroup$
The internal pull-downs in question are very weak, 1 MΩ. They are not meant to be "operational", and won't have any effect on normal I2C data transactions when the standard (10k-5k or 2k) pull-ups are attached to the I2C system bus. The reason for weak pull-downs is to provide well-defined bus state during power-on transients, when not all parts of the system are yet powered up.
The initial state with pull-downs is used by internal logic of the IC, per datasheet P.34:
When the gas gauge senses that both lines are low (such as during
removal of the pack),the device performs auto-offset calibration and
then goes into SLEEP mode to conserve power"
answered 1 hour ago
Ale..chenskiAle..chenski
28.9k11866
$endgroup$
$begingroup$
Just a tip: you can use HTML symbols in the posts.Ω,μ,°, etc. For superscripts and subscripts use HTML<sup>...</sup>and<sub>...</sub>. They don't work in the comments.
$endgroup$
– Transistor
1 hour ago
$begingroup$
Ok, thanks for the explanation!
$endgroup$
– haku15
1 hour ago
$begingroup$
@Transistor, thanks, and don't delete your comment - I will use it as future guide:-)
$endgroup$
– Ale..chenski
1 hour ago
add a comment |
StackExchange.ifUsing("editor", function ()
return StackExchange.using("mathjaxEditing", function ()
StackExchange.MarkdownEditor.creationCallbacks.add(function (editor, postfix)
StackExchange.mathjaxEditing.prepareWmdForMathJax(editor, postfix, [["\$", "\$"]]);
);
);
, "mathjax-editing");
StackExchange.ifUsing("editor", function ()
return StackExchange.using("schematics", function ()
StackExchange.schematics.init();
);
, "cicuitlab");
StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "135"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);
else
createEditor();
);
function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);
);
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2felectronics.stackexchange.com%2fquestions%2f430005%2fic-has-pull-down-resistors-on-smbus-lines%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
The internal pull-downs in question are very weak, 1 MΩ. They are not meant to be "operational", and won't have any effect on normal I2C data transactions when the standard (10k-5k or 2k) pull-ups are attached to the I2C system bus. The reason for weak pull-downs is to provide well-defined bus state during power-on transients, when not all parts of the system are yet powered up.
The initial state with pull-downs is used by internal logic of the IC, per datasheet P.34:
When the gas gauge senses that both lines are low (such as during
removal of the pack),the device performs auto-offset calibration and
then goes into SLEEP mode to conserve power"
answered 1 hour ago
Ale..chenskiAle..chenski
28.9k11866
$endgroup$
$begingroup$
Just a tip: you can use HTML symbols in the posts.Ω,μ,°, etc. For superscripts and subscripts use HTML<sup>...</sup>and<sub>...</sub>. They don't work in the comments.
$endgroup$
– Transistor
1 hour ago
$begingroup$
Ok, thanks for the explanation!
$endgroup$
– haku15
1 hour ago
$begingroup$
@Transistor, thanks, and don't delete your comment - I will use it as future guide:-)
$endgroup$
– Ale..chenski
1 hour ago
add a comment |
$begingroup$
The internal pull-downs in question are very weak, 1 MΩ. They are not meant to be "operational", and won't have any effect on normal I2C data transactions when the standard (10k-5k or 2k) pull-ups are attached to the I2C system bus. The reason for weak pull-downs is to provide well-defined bus state during power-on transients, when not all parts of the system are yet powered up.
The initial state with pull-downs is used by internal logic of the IC, per datasheet P.34:
When the gas gauge senses that both lines are low (such as during
removal of the pack),the device performs auto-offset calibration and
then goes into SLEEP mode to conserve power"
answered 1 hour ago
Ale..chenskiAle..chenski
28.9k11866
$endgroup$
$begingroup$
Just a tip: you can use HTML symbols in the posts.Ω,μ,°, etc. For superscripts and subscripts use HTML<sup>...</sup>and<sub>...</sub>. They don't work in the comments.
$endgroup$
– Transistor
1 hour ago
$begingroup$
Ok, thanks for the explanation!
$endgroup$
– haku15
1 hour ago
$begingroup$
@Transistor, thanks, and don't delete your comment - I will use it as future guide:-)
$endgroup$
– Ale..chenski
1 hour ago
add a comment |
$begingroup$
The internal pull-downs in question are very weak, 1 MΩ. They are not meant to be "operational", and won't have any effect on normal I2C data transactions when the standard (10k-5k or 2k) pull-ups are attached to the I2C system bus. The reason for weak pull-downs is to provide well-defined bus state during power-on transients, when not all parts of the system are yet powered up.
The initial state with pull-downs is used by internal logic of the IC, per datasheet P.34:
When the gas gauge senses that both lines are low (such as during
removal of the pack),the device performs auto-offset calibration and
then goes into SLEEP mode to conserve power"
answered 1 hour ago
Ale..chenskiAle..chenski
28.9k11866
$endgroup$
The internal pull-downs in question are very weak, 1 MΩ. They are not meant to be "operational", and won't have any effect on normal I2C data transactions when the standard (10k-5k or 2k) pull-ups are attached to the I2C system bus. The reason for weak pull-downs is to provide well-defined bus state during power-on transients, when not all parts of the system are yet powered up.
The initial state with pull-downs is used by internal logic of the IC, per datasheet P.34:
When the gas gauge senses that both lines are low (such as during
removal of the pack),the device performs auto-offset calibration and
then goes into SLEEP mode to conserve power"
answered 1 hour ago
Ale..chenskiAle..chenski
28.9k11866
edited 1 hour ago
answered 1 hour ago
Ale..chenskiAle..chenski
28.9k11866
answered 1 hour ago
Ale..chenskiAle..chenski
28.9k11866
answered 1 hour ago
Ale..chenskiAle..chenski
28.9k11866
28.9k11866
$begingroup$
Just a tip: you can use HTML symbols in the posts.Ω,μ,°, etc. For superscripts and subscripts use HTML<sup>...</sup>and<sub>...</sub>. They don't work in the comments.
$endgroup$
– Transistor
1 hour ago
$begingroup$
Ok, thanks for the explanation!
$endgroup$
– haku15
1 hour ago
$begingroup$
@Transistor, thanks, and don't delete your comment - I will use it as future guide:-)
$endgroup$
– Ale..chenski
1 hour ago
add a comment |
$begingroup$
Just a tip: you can use HTML symbols in the posts.Ω,μ,°, etc. For superscripts and subscripts use HTML<sup>...</sup>and<sub>...</sub>. They don't work in the comments.
$endgroup$
– Transistor
1 hour ago
$begingroup$
Ok, thanks for the explanation!
$endgroup$
– haku15
1 hour ago
$begingroup$
@Transistor, thanks, and don't delete your comment - I will use it as future guide:-)
$endgroup$
– Ale..chenski
1 hour ago
$begingroup$
Just a tip: you can use HTML symbols in the posts.
Ω, μ, °, etc. For superscripts and subscripts use HTML <sup>...</sup> and <sub>...</sub>. They don't work in the comments.$endgroup$
– Transistor
1 hour ago
$begingroup$
Just a tip: you can use HTML symbols in the posts.
Ω, μ, °, etc. For superscripts and subscripts use HTML <sup>...</sup> and <sub>...</sub>. They don't work in the comments.$endgroup$
– Transistor
1 hour ago
$begingroup$
Ok, thanks for the explanation!
$endgroup$
– haku15
1 hour ago
$begingroup$
Ok, thanks for the explanation!
$endgroup$
– haku15
1 hour ago
$begingroup$
@Transistor, thanks, and don't delete your comment - I will use it as future guide:-)
$endgroup$
– Ale..chenski
1 hour ago
$begingroup$
@Transistor, thanks, and don't delete your comment - I will use it as future guide:-)
$endgroup$
– Ale..chenski
1 hour ago
add a comment |
Thanks for contributing an answer to Electrical Engineering Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
Use MathJax to format equations. MathJax reference.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2felectronics.stackexchange.com%2fquestions%2f430005%2fic-has-pull-down-resistors-on-smbus-lines%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
