Post Go back to editing

LTC6811-2: where is the Parameters value for calculating pull up resister for I2C Master as LTC6811-2?

Thread Summary

The user wants to use LTC6811-2 GPIO 4 & 5 as an I2C master and needs to calculate the external pull-up resistor values. The VIL and VOL for the GPIO pins can be found in the SPI Interface DC Specifications and General DC Specifications sections of the LTC6811-2 datasheet, respectively. The maximum sink current is 10mA, as stated in the Absolute Maximum Ratings section. A 2kOhm pull-up resistor is recommended for the setup. The user should also consider the MAX14661's VIH (1.4V @ 3.3V) for compatibility.
AI Generated Content
Category: Hardware
Product Number: LTC6811-2

I want to use LTC6811-2 gpio 4 & 5 as the I2C master. The GPIOs are open drain outputs, so an external pull-up is required on these ports to operate as an I2C. 

External pull-up resistor calculations require the Input voltage low (Vil), Output Voltage low (Vol), and Output current low (Iol), Vcc = 5DC of the master I2C. where this value gets for calculations. 

This is not mentioned in the datasheet. As slave devices, MAX14661 was used. 

also, you can recommend an external pull-up resistor for our master and slave setup.

Thank You in Advance.