MCF8316A: What is the I2C address?

Robert Chen

Part Number: MCF8316A

I plan to use two MCF8316A on the same I2C bus. The datasheet shows the I2C address is configured by register DEVICE_CONFIG1.I2C_TARGET_ADDR with initial value "X". And the datasheet also shows the address as 0x01 in examples.

1. What is the actual initial I2C address?

2. How can I access to two MCF8316A on the same I2C bus? Should I disable (by DRVOFF) the 2nd one and configure the 1st with address A and then enable the 2nd one to configure its address as B?

Btw, the EEPROM seems unable to be erased through I2C. Is there any way to erase it? PS: If it can't be erased then we can't program data bits from 0 to 1.

over 3 years ago

0 Vishnu Balaraj over 3 years ago

TI__Mastermind 24415 points

Hi Robert,

Robert Chen said:
1. What is the actual initial I2C address?

Initial I2C address of MCF8316A is 0x01.

Robert Chen said:
2. How can I access to two MCF8316A on the same I2C bus? Should I disable (by DRVOFF) the 2nd one and configure the 1st with address A and then enable the 2nd one to configure its address as B?

You can configure the I2C address using register DEVICE_CONFIG1.I2C_TARGET_ADDR. Program the two devices with different I2C addresses.

EEPROM cannot be erased but the data can be overwritten. For example, you can write all zeros tot he EEPROM and re-write the EEPROM with desired values,

Regards,

Vishnu

0 Robert Chen over 3 years ago in reply to Vishnu Balaraj

Mastermind 9125 points

Thanks Vishnu.

It is strange that EEPROM can be "overwritten" without erase operation. "erase" will set bits to "1" while "program" will clear bits as "0". If a bit is programmed as "0" then it can NOT be set as "1" by 'program' operation. Am I wrong?

0 Vishnu Balaraj over 3 years ago in reply to Robert Chen

TI__Mastermind 24415 points

Robert,

Advantage of using EEPROM memory is that its memory can be re-written several times. EEPROM bits can be programmed to either 0 or 1. There is no such restriction that a bit programmed as zero can not be set as 1.

Regards,

Vishnu

0 Robert Chen over 3 years ago in reply to Vishnu Balaraj

Mastermind 9125 points

Vishnu,

I don't know that. I will test it when my motor control PCB is back.

0 Vishnu Balaraj over 3 years ago in reply to Robert Chen

TI__Mastermind 24415 points

Ok, please check the EEPROM read/write instructions (section 7.6) in the datasheet.

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MCF8316A: What is the I2C address?