ISO1540: Device recommendations

Zoey Wu

Expert 5855 points

Part Number: ISO1540
Other Parts Discussed in Thread: ISO1640

Tool/software:

Hi team

do we have I2C isolated device like ISO1540 but their VOL can keep less than 0.4V?

6 months ago

0 Aaditya V. 6 months ago

TI__Genius 17605 points

Hi Zoey,

Thanks for reaching out.

We have the ISO1540, as you have seen, and the ISO1640. both of these devices have VOL between 570-710mV. FAQ: [FAQ] Why is the logic LOW level output voltage, VOL1, up to 0.8V on Side1 of the ISO1540/ISO1541 and ISO1640/ISO1641 bidirectional I2C isolators? - Isolation forum - Isolation - TI E2E support forums

If you are looking to have lower VOL, one way to solve this is to use a bidirectional I2C buffer with lower VOL, between the ISO1540/ISO1640 and the MCU. I2C buffers can have lower VOL value which can make it more compatible in customer's system (for reference: ISO1540: ISO1540 side 1 VOL voltage).

Regards,
Aaditya Vittal