https://community.nxp.com/t5/Other-NXP-Products/SC18IM700-RX-and-TX-pins-TTL-or-not/m-p/569681#M3769 <HTML><HEAD></HEAD><BODY><P>Hello,</P><P>I am thinking about using the SC18IM700 for RS-232 to I2C conversion. My question is about the RX and TX pins on this chip. Are these real RS-232 signals that go from -5V to +5V or are they TTL serial signals that only go from 0V to +5V? I could not find any information about this on the data sheet.</P><P></P><P>Also, if they do go from -5V to +5V, are these values generated internally from the 2.3V-3.6V power supply used to operate the chip?</P><P></P><P>Thanks.</P></BODY></HTML> Thu, 04 Aug 2016 16:54:42 GMT zackjohnson 2016-08-04T16:54:42Z https://community.nxp.com/t5/Other-NXP-Products/SC18IM700-RX-and-TX-pins-TTL-or-not/m-p/569681#M3769 <HTML><HEAD></HEAD><BODY><P>Hello,</P><P>I am thinking about using the SC18IM700 for RS-232 to I2C conversion. My question is about the RX and TX pins on this chip. Are these real RS-232 signals that go from -5V to +5V or are they TTL serial signals that only go from 0V to +5V? I could not find any information about this on the data sheet.</P><P></P><P>Also, if they do go from -5V to +5V, are these values generated internally from the 2.3V-3.6V power supply used to operate the chip?</P><P></P><P>Thanks.</P></BODY></HTML> Thu, 04 Aug 2016 16:54:42 GMT https://community.nxp.com/t5/Other-NXP-Products/SC18IM700-RX-and-TX-pins-TTL-or-not/m-p/569681#M3769 zackjohnson 2016-08-04T16:54:42Z https://community.nxp.com/t5/Other-NXP-Products/SC18IM700-RX-and-TX-pins-TTL-or-not/m-p/569682#M3770 <HTML><HEAD></HEAD><BODY><P>Hello Jack,</P><P></P><P>The signal levels of the TX and RX pins are as stated on Table 11 in the datasheet.</P><P></P><P>If you want to use this device for RS-232 communication over a wire, then you will need an RS-232 line transceiver also.</P><P></P><P>Regards,</P><P>Tomas</P><P></P><P><EM style="font-weight: normal; font-style: italic; font-size: 11px; font-family: arial, helvetica, 'helvetica neue', verdana, sans-serif; color: #51626f; text-align: left; text-indent: 0px;">PS: If this answer helps to solve your question, please mark it as "Correct". Thank you.</EM></P></BODY></HTML> Fri, 05 Aug 2016 08:40:21 GMT https://community.nxp.com/t5/Other-NXP-Products/SC18IM700-RX-and-TX-pins-TTL-or-not/m-p/569682#M3770 TomasVaverka 2016-08-05T08:40:21Z