PCF2131 is sending Acknowledgment

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PCF2131 is sending Acknowledgment

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PK_1114
Contributor II

Hai,

I am Working with the PCF2131is interfaced with the LPC54608 FC-7,

while Configuring the RTC it is going to slave not ACK state in I2C Bus Communication

PK_1114_0-1675335061456.png

 

 

Thank You,

B Pavan Kumar

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1 Solution
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TomasVaverka
NXP TechSupport
NXP TechSupport

Hi,

First of all, please double check that the IFS pin is connected to VDD:

Capture.JPG 

Then please make sure that the 7-bit slave address (1010011) is placed in the upper 7 bits of the byte and the write/read bit is in the LSB. This means 0xA6 for a write and 0xA7 for a read. Best is to check it using a logic analyzer or an oscilloscope.

Best regards,

Tomas

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428 Views
TomasVaverka
NXP TechSupport
NXP TechSupport

Hi,

First of all, please double check that the IFS pin is connected to VDD:

Capture.JPG 

Then please make sure that the 7-bit slave address (1010011) is placed in the upper 7 bits of the byte and the write/read bit is in the LSB. This means 0xA6 for a write and 0xA7 for a read. Best is to check it using a logic analyzer or an oscilloscope.

Best regards,

Tomas