☑ I2c Pullup Resistor Calculation Nxp

Is there any recommended pull up resistor for scl and sda lines of the i2c peripherals. A strong pullup small resistor prevents the i2c pin on an ic from being able to drive low.

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Google fast mode plus i2c.

I2c pullup resistor calculation nxp. This is the minimum pull up resistance for an i2c bus composed of efm8lb1 devices. Question asked by audrey eng on jan 14 2016 latest reply on jan 15 2016 by stano arendarik. Mc56f82748 i2c pull up resistor.

2 pullup resistor calculation. Also vcc is 45v to 12v as per datasheet. Like show 0 likes 0.

There is an nxp document explaining the limits. I read the datasheet and understand that there is no noise margin for this ic the output will appear same as the input. If your wiring is ok no extra resistors should be needed.

Sending i2c bus signals via long communications cables. Afaik arduinos are able to match fm i2c devices 400khz4000pf30ma. The vol level that can be read as a valid logical low by the input buffers of an ic determines the minimum pullup resistance rpmin.

A rough calculation for standard mode gives a maximum value of 667k. This remote board will derive its 5 v supply from the first board via the cable and con2. Is my understanding is correct.

This is for mc56f82748anguilla silver. I2c bus specification and user manual. Due to the variety of different technology devices cmos nmos bipolar that can be connected to the i2c bus the levels of the logical 0 low and 1 high are not fixed and depend on the associated level of vdd.

The other end of the cable is fitted into the rj45 jack con2 of a second or remote p82b96pca9600 daughter board. Can i pull up sda and scl lines on both side of buffer with 18v. I am working with p82b715 ic for long ditance i2c communication.

Much lower value pullup resistors are allowed 330ohm. Lower than this and we cannot guarantee that the device can pull the i2c bus lines below v ol. 312 sda and scl logic levels.

Optimum value of pull up resistor will also depend on the mode you want to use standard or fast mode. Standard i2c devices are 100khz400pf3ma. You can calculate the exact value based on the mode required.