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TPS65920 hard coded I2C address

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Answered (Not Verified) This post has 0 verified answers | 3 Replies | 3 Followers

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Amit Benjamin posted on 25 Oct 2009 3:47 PM
I2C hard coded addresses.jpg

Hi,

could you help answer the following question regarding the attached sentences from the datasheet?

have a question regarding I2C on TPS65920. The component's DS reads:

  • What does "hard-coded" mean? Does it mean the slave address can't be configured by software? How do I go about choosing one address?
  • What is the "ID5" address?

Thanks,

Amit

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Answered (Not Verified) Ankit Somani replied on 26 Oct 2009 2:12 AM
Suggested by Gandhar Dighe

Hi Amit,

Hard-coded means that the Slave address in the PMIC have been fixed and they cannot be re-configured by any means. They (Slave address) are used when one wants to communicate with that slave's registers. You can refer to the I2C specifications, to know how to pass the device (slave) address. Just for your reference, when accessing any register in a slave, you first need to pass the device address through I2C to select that particular Slave and then the register address.

ID5 address is 12 (hex). It is used by Smart Reflex

 

Regards

Ankit

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Amit Benjamin replied on 2 Nov 2009 2:28 AM
I2C address hard coded.jpg

Hi Ankit,

my customer return with few more questions:

Thanks for your reply. I need some more detail on the four different I2C addresses for I2C1 (general purpose) - Is there a list of registers for each address? See this snapshot from Mistrals EVB user guide:
 
thanks
Amit
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Texas Instruments Employee
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Gandhar Dighe replied on 2 Nov 2009 12:44 PM

Hi Amit,

Look at this document - http://focus.ti.com/lit/ug/swcu052c/swcu052c.pdf

section 2.6 has the list of all registers for each address.

 

Regards,

Gandhar.

 

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