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Interfacing of 3 ADAU1701 with a single EEPROM

Question asked by on May 26, 2010
Latest reply on May 27, 2010 by
In my project(a 6 Channel audio device) i'm using three ADAU1701.
In preliminary session of project i used separate eeprom for each ADAU. Since
each ADAU carry less algorithm i thought to use single eeprom for 3 ADAU and to
connect three using i2c mode. I used sigma studio s/w for coding.
But here exist some problem..

1)As per mentioned in Data sheet i connected the address pins of three ADAU

  ADDR1   ADDR0   R/W
    0       0      0    - 0x68
    0       1      0    - 0x6A
    1       0      0    - 0x6C

but when i tried to set the address in hardware configuration window of Sigma
studio as above the communication failure occurs.Why it happens?

2)But when i set the address of 3 ADAU same as 0x68 in configuration window
without changing the connection of adress pin in my board communication was
success.Although its incorrect addressing.
but i'm unable to write this in eeprom.

3)Also there are differences in algorithm of each ADAU.How can i make out which
Ic's algorithm is loaded in each one..if it happen so. i mean 3 ADAU with same

4)i made hardware connection of address pins as per data sheet
ie first one 00
2nd 01
3rd 10
i think there is no hardware mistakes.

please Help me to get rid of these problem.