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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 1 hour 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 1 hour 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 1 hour 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 1 hour ago
haku15haku15
726
asked 1 hour ago
haku15haku15
726
asked 1 hour ago
haku15haku15
726
asked 1 hour ago
haku15haku15
726
asked 1 hour 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 57 mins 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
53 mins ago
$begingroup$
Ok, thanks for the explanation!
$endgroup$
– haku15
9 mins ago
$begingroup$
@Transistor, thanks, and don't delete your comment - I will use it as future guide:-)
$endgroup$
– Ale..chenski
3 mins ago
add a comment |
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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 57 mins 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
53 mins ago
$begingroup$
Ok, thanks for the explanation!
$endgroup$
– haku15
9 mins ago
$begingroup$
@Transistor, thanks, and don't delete your comment - I will use it as future guide:-)
$endgroup$
– Ale..chenski
3 mins 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 57 mins 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
53 mins ago
$begingroup$
Ok, thanks for the explanation!
$endgroup$
– haku15
9 mins ago
$begingroup$
@Transistor, thanks, and don't delete your comment - I will use it as future guide:-)
$endgroup$
– Ale..chenski
3 mins 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 57 mins 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 57 mins ago
Ale..chenskiAle..chenski
28.9k11866
edited 48 mins ago
answered 57 mins ago
Ale..chenskiAle..chenski
28.9k11866
answered 57 mins ago
Ale..chenskiAle..chenski
28.9k11866
answered 57 mins 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
53 mins ago
$begingroup$
Ok, thanks for the explanation!
$endgroup$
– haku15
9 mins ago
$begingroup$
@Transistor, thanks, and don't delete your comment - I will use it as future guide:-)
$endgroup$
– Ale..chenski
3 mins 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
53 mins ago
$begingroup$
Ok, thanks for the explanation!
$endgroup$
– haku15
9 mins ago
$begingroup$
@Transistor, thanks, and don't delete your comment - I will use it as future guide:-)
$endgroup$
– Ale..chenski
3 mins 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
53 mins 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
53 mins ago
$begingroup$
Ok, thanks for the explanation!
$endgroup$
– haku15
9 mins ago
$begingroup$
Ok, thanks for the explanation!
$endgroup$
– haku15
9 mins ago
$begingroup$
@Transistor, thanks, and don't delete your comment - I will use it as future guide:-)
$endgroup$
– Ale..chenski
3 mins ago
$begingroup$
@Transistor, thanks, and don't delete your comment - I will use it as future guide:-)
$endgroup$
– Ale..chenski
3 mins ago
add a comment |
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