https://community.nxp.com/t5/LPC-Microcontrollers/I2C-Detection-Fail/m-p/1574375#M51098 <P>Hi,</P> <P>I have downloaded the data sheet of LM75, which is a temperature sensor with I2C interface, but the LPC75 can only be a I2C slave in stead of master, if you use the I2C module of LPC804 with SCL PIO0_14 and SDA PIO0_7, the I2C module of LPC804 is master.</P> <P>For the device address of LM75, it has A2/A1/A0 pins, this is address format.</P> <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="xiangjun_rong_0-1672022324982.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/205400i3C8760B4D848F6D5/image-size/medium?v=v2&amp;px=400" role="button" title="xiangjun_rong_0-1672022324982.png" alt="xiangjun_rong_0-1672022324982.png" /></span></P> <P>&nbsp;</P> <P>Assume that the A2/A1/A0 pin logic is 000 via pull up/down resistors, the I2C device address of LM75 is 0x48. Assume that the A2/A1/A0 pin logic is 011, the I2C device address of LM75 is 0x4B.</P> <P>Because the I2C of LPC804 is master, so you have to use the</P> <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="xiangjun_rong_2-1672022619602.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/205403i219E5B25ADA2D523/image-size/medium?v=v2&amp;px=400" role="button" title="xiangjun_rong_2-1672022619602.png" alt="xiangjun_rong_2-1672022619602.png" /></span></P> <P>&nbsp;</P> <P>Hope it can help you</P> <P>BR</P> <P>XiangJun Rong</P> Mon, 26 Dec 2022 02:47:30 GMT xiangjun_rong 2022-12-26T02:47:30Z https://community.nxp.com/t5/LPC-Microcontrollers/I2C-Detection-Fail/m-p/1574235#M51095 <P>Hello everyone,</P><P>I have a problem with the OM40001 sample "lpcxpresso804_lpc_i2c_interrupt_b2b_transfer_slave". I have removed the bridges for the LM75 and agreed on a slave on SCL PIO0_14 and SDA PIO0_7. I can't find the device on my agreed address with an I2C detect with an I2C master. I have connected SCL with SCL and SDA with SDA.<BR />Does anyone have a solution? Thanks a lot.</P> Fri, 23 Dec 2022 16:16:36 GMT https://community.nxp.com/t5/LPC-Microcontrollers/I2C-Detection-Fail/m-p/1574235#M51095 coder_72 2022-12-23T16:16:36Z https://community.nxp.com/t5/LPC-Microcontrollers/I2C-Detection-Fail/m-p/1574375#M51098 <P>Hi,</P> <P>I have downloaded the data sheet of LM75, which is a temperature sensor with I2C interface, but the LPC75 can only be a I2C slave in stead of master, if you use the I2C module of LPC804 with SCL PIO0_14 and SDA PIO0_7, the I2C module of LPC804 is master.</P> <P>For the device address of LM75, it has A2/A1/A0 pins, this is address format.</P> <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="xiangjun_rong_0-1672022324982.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/205400i3C8760B4D848F6D5/image-size/medium?v=v2&amp;px=400" role="button" title="xiangjun_rong_0-1672022324982.png" alt="xiangjun_rong_0-1672022324982.png" /></span></P> <P>&nbsp;</P> <P>Assume that the A2/A1/A0 pin logic is 000 via pull up/down resistors, the I2C device address of LM75 is 0x48. Assume that the A2/A1/A0 pin logic is 011, the I2C device address of LM75 is 0x4B.</P> <P>Because the I2C of LPC804 is master, so you have to use the</P> <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="xiangjun_rong_2-1672022619602.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/205403i219E5B25ADA2D523/image-size/medium?v=v2&amp;px=400" role="button" title="xiangjun_rong_2-1672022619602.png" alt="xiangjun_rong_2-1672022619602.png" /></span></P> <P>&nbsp;</P> <P>Hope it can help you</P> <P>BR</P> <P>XiangJun Rong</P> Mon, 26 Dec 2022 02:47:30 GMT https://community.nxp.com/t5/LPC-Microcontrollers/I2C-Detection-Fail/m-p/1574375#M51098 xiangjun_rong 2022-12-26T02:47:30Z