Other Parts Discussed in Thread: INA237, , ISO1640, INA226, TCA9517A, TCA9800
We want to use I2C to output power telemetry data. But checked their H/L threshold voltage, INA237 consider 0 - 0.4 V as L. Will ISO1641 be able to output the L less than 0.4 V? Adding buffer will be a negative effect for the customers since cost is one of their major considerations.
In the datasheet, since SDA/SCL are open-drain pins, if there is no PN junction in the loop at the low side, I think we can make the ISO1640/1’s low level much lower than 0.57 – 0.71 V by adjusting the pull-up resistance (the SDA/SCL current will be reduced too). Since we do not need a high data rate (1 - 10 kHz), large pull-up resistance should be acceptable.