https://community.nxp.com/t5/NXP-Designs/PCA85073A-RTC-no-acknowledge/m-p/1554589#M1007 <P>The MCU (S32K344) sends the data: 0xA2 0x04. Where: 0xA2 is composed of the device ID: 0x51 and writeBit. After sending the first byte, the PCA85073A does not send the ACK bits causing the MCU to stop sending.</P><P>I2C-SCL and I2C_SDA are connected with 3K up resistance.VCC=4.75V。</P><P>Why did the PCA85073A not respond to the ACK?</P> Wed, 16 Nov 2022 07:28:23 GMT liyongfeng 2022-11-16T07:28:23Z https://community.nxp.com/t5/NXP-Designs/PCA85073A-RTC-no-acknowledge/m-p/1554589#M1007 <P>The MCU (S32K344) sends the data: 0xA2 0x04. Where: 0xA2 is composed of the device ID: 0x51 and writeBit. After sending the first byte, the PCA85073A does not send the ACK bits causing the MCU to stop sending.</P><P>I2C-SCL and I2C_SDA are connected with 3K up resistance.VCC=4.75V。</P><P>Why did the PCA85073A not respond to the ACK?</P> Wed, 16 Nov 2022 07:28:23 GMT https://community.nxp.com/t5/NXP-Designs/PCA85073A-RTC-no-acknowledge/m-p/1554589#M1007 liyongfeng 2022-11-16T07:28:23Z https://community.nxp.com/t5/NXP-Designs/PCA85073A-RTC-no-acknowledge/m-p/1563223#M1022 <P>Please share with your schematic for RTC part!</P> Fri, 02 Dec 2022 05:56:30 GMT https://community.nxp.com/t5/NXP-Designs/PCA85073A-RTC-no-acknowledge/m-p/1563223#M1022 guoweisun 2022-12-02T05:56:30Z