Other NXP Products中的主题 SC18IS602: I2C Address setting https://community.nxp.com/t5/Other-NXP-Products/SC18IS602-I2C-Address-setting/m-p/953360#M7913 <HTML><HEAD></HEAD><BODY><P>Hello NXP Team,</P><P>Does the A0, A1 and A2 address setting pins of the IC has internal pull up?</P><P>I had added only 0E pull down option for these 3 pins with which I get 0x28 I2C address for the IC.</P><P>Is it possible to get any other address for the IC by removing any of these resistors?</P></BODY></HTML> Fri, 20 Sep 2019 17:51:29 GMT emilzachariageo 2019-09-20T17:51:29Z SC18IS602: I2C Address setting https://community.nxp.com/t5/Other-NXP-Products/SC18IS602-I2C-Address-setting/m-p/953360#M7913 <HTML><HEAD></HEAD><BODY><P>Hello NXP Team,</P><P>Does the A0, A1 and A2 address setting pins of the IC has internal pull up?</P><P>I had added only 0E pull down option for these 3 pins with which I get 0x28 I2C address for the IC.</P><P>Is it possible to get any other address for the IC by removing any of these resistors?</P></BODY></HTML> Fri, 20 Sep 2019 17:51:29 GMT https://community.nxp.com/t5/Other-NXP-Products/SC18IS602-I2C-Address-setting/m-p/953360#M7913 emilzachariageo 2019-09-20T17:51:29Z Re: SC18IS602: I2C Address setting https://community.nxp.com/t5/Other-NXP-Products/SC18IS602-I2C-Address-setting/m-p/953361#M7914 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P></P><P><SPAN style="color: #c00000;">Does the A0, A1 and A2 address setting pins of the IC has internal pull up?</SPAN></P><P>[Answer] No, desired logic level need to be driven externally either by connecting external pull-up to referenced to VCC, or connecting them to external GND. You should not leave these pns unconnected.</P><P>&nbsp;</P><P><SPAN style="color: #c00000;">I had added only 0E pull down option for these 3 pins with which I get 0x28 I2C address for the IC.</SPAN></P><P><SPAN style="color: #c00000;">Is it possible to get any other address for the IC by removing any of these resistors?</SPAN></P><P>[Answer] This is correct, the slave address of the SC18IS602B is comprised of a fixed and a programmable part. The programmable part of the slave address enables the maximum possible number of such devices to be connected to the I2C-bus. Since the SC18IS602B has three programmable address bits (defined by the A2, A1, and A0 pins), it is possible to have eight of these devices on the same bus.</P><P>&nbsp;</P><P>The slave address is: 0 1 0 1 A2 A1 A0 R/W</P><P>&nbsp;</P><P>If A2, A1 and A0 are tied to ground, the address would be 0 1 0 1 0 0 0 R/W (7-bit 0x28).</P><P>If for example you connect A1 pin to VCC trough an external pull-up and leave A2 and A0 pins connected to GND, the address would be 0 1 0 1 0 1 0 R/W (7-bit 0x2A).</P><P>&nbsp;</P><P>You can find more details on section 7.1.1 of the device datasheet: <A href="https://www.nxp.com/docs/en/data-sheet/SC18IS602B.pdf">https://www.nxp.com/docs/en/data-sheet/SC18IS602B.pdf</A></P><P></P><P>Regards,</P><P>Jose</P><P>NXP Semiconductors</P></BODY></HTML> Fri, 20 Sep 2019 22:20:46 GMT https://community.nxp.com/t5/Other-NXP-Products/SC18IS602-I2C-Address-setting/m-p/953361#M7914 reyes 2019-09-20T22:20:46Z Re: SC18IS602: I2C Address setting https://community.nxp.com/t5/Other-NXP-Products/SC18IS602-I2C-Address-setting/m-p/953362#M7915 <HTML><HEAD></HEAD><BODY><P>Hi Jose,</P><P>Thanks for confirming of the absence of internal pull ups.</P><P>We shall proceed accordingly.</P></BODY></HTML> Sat, 21 Sep 2019 05:57:48 GMT https://community.nxp.com/t5/Other-NXP-Products/SC18IS602-I2C-Address-setting/m-p/953362#M7915 emilzachariageo 2019-09-21T05:57:48Z