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PCA9600 long distance Slave is permanently pull down

Question asked by rohith krishnan on Oct 18, 2016

Hi,

 

I am using PCA9600 for long distance communication. Telephone cable of 90m is used and Clock frequency is 80KHz. The PIC Controller is used as MASTER(pull up 2.2k) and CAT24C64WI(EEPROM) is used as SLAVE(pull up 2.2k). PCA9600 supply voltage is 6V and current drawn is 9mA and pull up of 1k. During the READ operation the EEPROM gets permanently pull down and current drawn by PCA9600 is 21mA. What may be the possible reason for this? When the frequency is reduced to 33KHz its working fine, is this the frequency limit of PCA for 90m 

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