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LP8764-Q1: Inquiry on Parallelization of Two LP8764 PMICs (Master-Slave Configuration)

NABIL KERBILA
Prodigy 10 points
Part Number: LP8764-Q1
Other Parts Discussed in Thread: TPS6594-Q1

Tool/software:

Dear TI Support Team,

I would like to inquire about the parallelization of two LP8764 PMICs, where one operates as the master and the other as the slave. Specifically, I have the following questions:

  1. Can the two PMICs be configured to share a single I2C address, or does each require a unique address ?

  2. If separate addresses are required, how can they be differentiated in the system?

I would appreciate it if you could provide a hardware sheet  example of how to implement this configuration.

Thank you for your support.

Best regards,
Kerbila Nabil

  • 0
    TI__Genius 16830 points

    Hi ,

    NABIL KERBILA said:
    Can the two PMICs be configured to share a single I2C address, or does each require a unique address ?

    No that is not possible each device would have their own I2C address. 

    NABIL KERBILA said:
    If separate addresses are required, how can they be differentiated in the system?

    Depends on with whom device are you connecting to, if it is MCU then MCU should have capability to distinguish. 

    However, the communication between the two PMIC is done by the SPMI not I2C . I2C is to communicate with another MCU or SOC.

    For more details , read the full datasheet on I2C communication and SPMI.  

    Regards,

    Ishtiaque 

  • 0 in reply to Ishtiaque Panhwar
    Prodigy 10 points

    Hello Isthiaque ;

    Thank you for you response ;

    The device connected to the Primary PMIC is a SOC, The SOC can already deliver two different adresses , but we have to know wich adress we have to put to choose the LP8764 device , i did not find the informaiton on the datasheet...

    We are also searching for a hardware sheet or examples of the Multi-PMIC Synchronization ; an a app note or a an EVM...?

    King regards

    Nabil

  • 0 in reply to NABIL KERBILA
    TI__Genius 16830 points

    Hi,

    NABIL KERBILA said:
    The device connected to the Primary PMIC is a SOC, The SOC can already deliver two different adresses , but we have to know wich adress we have to put to choose the LP8764 device , i did not find the informaiton on the datasheet...

    Can you let me know the full part number of the PMIC? You should be able to see the I2C address in user guide either available on ti.com or provided by the TI.

    NABIL KERBILA said:
    We are also searching for a hardware sheet or examples of the Multi-PMIC Synchronization ; an a app note or a an EVM...?

    As of now we do not have case where two LP8764-Q1 PMIC have been used as multi-PMIC. However, LP8764-Q1 has been used as multi-pmic with other devices such as TPS6594-Q1 (https://www.ti.com/product/TPS6594-Q1) where you could see the user guides. 

    1. Link 

    2. Link etc 

    Regards,

    Ishtiaque  

  • 0 in reply to Ishtiaque Panhwar
    Prodigy 10 points

    Hi,

    Thank you very much for your response and the helpful information.

    At this stage, we haven’t ordered the PMICs yet — we are still in the evaluation and planning phase. Before proceeding, we’d like to confirm one point regarding I2C addressing.

    Could you please clarify whether each LP8764-Q1 PMIC has a unique I2C address? In other words, if we order a batch of 2 or 3 LP8764-Q1 devices, will each one come with a different I2C address, allowing us to use a shared I2C bus for all of them? Or will the I2C address be fixed and require manual configuration or pin setup?

    This information will help us better plan the I2C communication and system integration.

    Thanks again for your support.

    Best regards,

    Nabil

  • 0 in reply to NABIL KERBILA
    TI__Genius 16830 points

    Hi Nabil,

    NABIL KERBILA said:
    Could you please clarify whether each LP8764-Q1 PMIC has a unique I2C address? In other words, if we order a batch of 2 or 3 LP8764-Q1 devices, will each one come with a different I2C address, allowing us to use a shared I2C bus for all of them? Or will the I2C address be fixed and require manual configuration or pin setup?

    If you are ordering the same PMIC then I2C address would be same. It won't be different. For example if your ordering LP876440C0RQKRQ1 then it would have just one I2C address by default. But then you can reconfigure that by reprogramming the device. It is possible with few tens or even hundreds of devices to change the I2C address in this way but this is not advisable for large volume production. This is only convenient during prototyping or for very small build. 

    I hope this answers your question. 

    Regards,

    Ishtiaque  

  • 0 in reply to Ishtiaque Panhwar
    Prodigy 10 points

    Hello Isthiaque ;

    Thank you for your return ;

    In the case of we take the same PN and so the same I2C default adress ; Using the same I2C for two different PMIC would be critical if we take into account some shift between the two feedback communication between thetwo PMIC's and the I2C source , and could cause short-circuit , Even if the PMIC's adress is configurable with software , but for the very first time configuration they share the same I2C adress...Could you tell us if the reasoning is correct or not? and what is the available option for us to avoid this problematic ?
    Thank you very much.

    Nabil

  • 0 in reply to NABIL KERBILA
    TI__Genius 16830 points

    Hi Nabil,

    Yes that would be issue if are populating the two without changing the I2C address of one. So workaround would be to first change the I2C address of one PMIC then populate on the board. Then you would not have issue. 

    Regards,

    Ishtiaque