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ISO7741: power consumption comparison between ISO7741 and ISO7341

Steven Liu1
Expert 4465 points
Part Number: ISO7741


Hi Team, 

My customer had a design which requires the signal isolation for the interface, such as CAN.

They have a very strict power consumption requirement in the low power state(such as sleep mode) as the key components are powered by battery. 

When I check the ISO7741 for their design, the isolation spec can meet their requirement, but there's no clear info about the power consumption in the low power state. So I want to learn the power numbers for ISO7741 and ISO7341(which is the lower power device) in the low power mode. 

Here are some more description about the design and sleep mode:

The ISO7741/ISO7341 was power by 3.3V and 5V (3.3V for the MCU signal, while 5V for the interface signal, such as CAN). In the low power mode, MCU enters the sleep mode, which means there's no signal transferring on the digital isolation. In this state, the power consumption numbers are very important.

So I would appreciate your comment on this. Thank you! 

 

  • 0
    TI__Guru 55845 points
    Hi Steven,

    ISO7741 employs OOK architecture while ISO7341 is based on edge-based architecture. Due to this architectural differences, the power consumption of these two devices is expected to be slightly different.

    For datarates upto 1Mbps, ISO7341 is going to consume slightly lower power compared to ISO7741. The following are the typical idle current consumption of both devices with VCC1 = 3.3V & VCC2 = 5V, EN1 = EN2 = 0 & all INx = open/floating or default state. Default state for both devices is HIGH as the part number doesn't have F suffix.

    ISO7741 (typical / max):
    ICC1 = 1mA / 1.5mA
    ICC2 = 0.8mA / 1.1mA

    ISO7341 (typical / max):
    ICC1 = 0.6mA / 1mA
    ICC2 = 0.7mA / 1.3mA

    If the above current consumption difference is not considered much then I would recommend customer to use ISO7741 as it is our latest digital isolator with much higher performance than ISO7341. Thanks.


    Regards,
    Koteshwar Rao