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TCAN1469-Q1: Dark current issue

Do-hyun Kim
Prodigy 105 points
Part Number: TCAN1469-Q1
Other Parts Discussed in Thread: TCAN1463-Q1, , LP87524J-Q1

In TCAN1469, there is a phenomenon in which dark current is measured excessively, unlike in DATA SHEET.

The dark current measured value is confirmed as 37uA in the DATA SHEET, but the actual measured value is over 350uA.

I think it's probably a settings issue.

The settings of the previous development chip, TCAN1463, have been applied as is, and the settings have been ported to TCAN1469.

Is there anything else I need to configure?

  • 0
    TI__Mastermind 25385 points

    Do-hyun,

    Thanks for reaching out! The TCAN1469-Q1 is a partial networking SIC transceiver, while the TCAN1463-Q1 is a standard (non-partial-networking) SIC transceiver. The TCAN1469-Q1 is SPI controlled, while the TCAN1463-Q1 is not.

    By "dark current," do you mean sleep current, which is ISUP in sleep mode? Do you have activity on the bus during this test? Bus activity would activate the low-power selective wake receiver in the device, which is typically around 400µA.

    Best,

    Danny

  • 0 in reply to Danny Bacic
    Prodigy 105 points

    In our system we are using LP87524J-Q1.

    After setting the Spread-Spectrum Mode to ON in the PMIC, the TCAN1469 dark current was improved (less than 20uA), but the PMIC did not operate even when the Spread-Spectrum Mode was Off, and the PMIC did not operate even when the Spread-Spectrum Mode was On.

  • 0 in reply to Do-hyun Kim
    TI__Guru 50795 points

    Hi Do-hyun,

    The TCAN1469 consumes additional current while the transceiver is in sleep mode with selective wake active. This is required for the internal oscillator to be active so that the device can decode CAN messages and the WUF can be recognized. This additional current is specified to be 400uA typical which is similar to the 350uA measurement that you have reported. This current should only be required while the CAN bus is active. When the CAN bus is idle for >1sec, the transceiver will turn off the selective wake receiver and draw a maximum of 35uA while monitoring for CAN activity (WUP). 

    Are you currently testing the TCAN1469 in a selective wake configuration to evaluate sleep current draw? Is the CAN bus active during these measurements? 

    Regards, 
    Eric Schott