Other Parts Discussed in Thread: ISO1640
Dear team,
Could you please help to check what is the status of SCL and SDA of ISO1540/1 when device is in power down mode. Are they high impendence? Or pull-down? Thanks.
B.R.
Zhizhao
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Hi Zhizhao,
Thanks for reaching out.
The I/O pins SCL and SDA of ISO154x will be in high-impedance / floating when they are powered-down.
We now have ISO1640 which is second-generation reinforced version that is pin-compatible to ISO1540. You might want to recommend this device to customer. Thanks.
Regards,
Koteshwar Rao
Hi Rao,
Thanks for the quick reply and my last question is that
when ISO154x VCC1 power is off, but SDA1&SCL1 connect to other 3V3 power, could you help to confirm SDA1&SCL1 can keep Hi-Z at that situation? Thanks.
B.R.
Lucas
Hi Lucas,
The absolute maximum rating of SDA1 and SCL1 are VCC1+0.5V, as stated in the datasheet. This means that, if VCC1 is 0V then SDA1 and SCL1 can only be applied a maximum of 0.5V. This means that the I/O pins cannot be applied with a signal without VCC1 powered otherwise, it will lead to device damage. This is also true to most other digital isolators. Thanks.
Regards,
Koteshwar Rao