https://community.nxp.com/t5/Other-NXP-Products/PCF2127-communication-problem/m-p/1339885#M12074 <P>We are using PCF2127. Several PCBs have the same problem. During communication over I2C the IC reports a NAK after some write request. This happens after a several read / write operations but every time at the same point.</P><P>IC has this issue only at the first start. When I disconnect the battery from the IC and plug it back in (do a full reset), the device works fine until the next power cycle.</P><P>Can I reset the IC over I2C command without disconnecting the battery?</P> Wed, 15 Sep 2021 06:50:20 GMT Konstantin_ch 2021-09-15T06:50:20Z https://community.nxp.com/t5/Other-NXP-Products/PCF2127-communication-problem/m-p/1339885#M12074 <P>We are using PCF2127. Several PCBs have the same problem. During communication over I2C the IC reports a NAK after some write request. This happens after a several read / write operations but every time at the same point.</P><P>IC has this issue only at the first start. When I disconnect the battery from the IC and plug it back in (do a full reset), the device works fine until the next power cycle.</P><P>Can I reset the IC over I2C command without disconnecting the battery?</P> Wed, 15 Sep 2021 06:50:20 GMT https://community.nxp.com/t5/Other-NXP-Products/PCF2127-communication-problem/m-p/1339885#M12074 Konstantin_ch 2021-09-15T06:50:20Z