Q
I want to know if it is possible to connect a I2C device to the Side 1 of yourADuM1250 chip. The I2C device has SDA,SCL Input Logic-High (Vih) of 1.4 V
minimum, SDA,SCL Input Logic-Low (Vil) of 0.5 V maximum and SDA Output
Logic-Low (Vol) of 0.4 V maximum.
I know this iCoupler has an output logic low voltage of 0.9 V (max.) on Side 1.
For that reason I am not sure about its suitability to communicate with the
device desired in Side 1. Could you confirm if it is suitable or not?
A
The ADuM125x parts are not compatible with the Vil of your I2C device. Our parttypically drives its low output on side 1 at 0.85V, and a part that is rated
for Vil=0.5V will almost be guaranteed to have trouble reading our low level as
a low.
The side 1 output voltages are listed in the standard DC parameters spec table.
Side 2 of our device will be compatible with this voltage convention.
