BQ24158: can I2C use 3.3V?

user021864

Intellectual 2145 points

Part Number: BQ24158

Hi,

My customer is wondering if the I2C interface can also used 3.3V pull up?

Will there be any risk using 3.3V pull up?

Since 1.8V is mentioned in our datasheet but customer is having 3.3V at their host side.

Great thanks for your help.

over 5 years ago

0 Joel Hernandez II over 5 years ago

TI__Mastermind 25800 points

Hello,

1.8V is the minimum pull-up voltage that this device is verified against.

3.3V is fine to use as a pullup rail.

Regards,

Joel H

0 chen vincent over 5 years ago in reply to Joel Hernandez II

Prodigy 20 points

Hi Joel H,

Please advise digital voltage range spec.(I2C pull-up voltage & CD pin(charger enable/disable), can we control the CD pin with 3.3V level? thanks

Vincent

0 user021864 over 5 years ago in reply to Joel Hernandez II

TI__Intellectual 2145 points

Hi Joel,

May I know how to define if the I2C interface using 1.8V or 3.3V?

Is there a VIH or VIL threshold for this case?

since I2C interface is usually and open drain structure, 1.8V and 3.3V should be all compatible with each other?

When do we need to use level-shifter ?

Great thanks for your help.

0 Joel Hernandez II over 5 years ago in reply to user021864

TI__Mastermind 25800 points

Hello,

The VIH and VIL thresholds for the CD pin are in the EC table of the BQ24158 datasheet.

For the I2C communication, the I2C protocol is standardized. I will refer you to: https://www.i2c-bus.org/ for more information about the I2C protocol. This charger follows the specification listed there.

Regards,

Joel H

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BQ24158: can I2C use 3.3V?