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TIC10024-Q1: TIC10024 sleep mode no SPI Iq consumption

Scarlett Cao
Expert 4000 points
Part Number: TIC10024-Q1
Other Parts Discussed in Thread: TIC12400-Q1

Tool/software:

Hi team,

When using TIC10024-Q1 at sleep mode and no SPI communication, only use INT to wakeup MCU, the current consumption is mainly from VDD or VBAT? What is the Iq under this condition? It is very critical information for customer to understand whether they could use our device to meet system Iq budget.

Thank you and appreciate your timely feedback

Scarlett

  • 0
    TI__Mastermind 33030 points

    Hi Scarlett,

    The current is all coming through the VS supply pin (VBAT).  The VDD pin only supplies the reference voltage for the digital IO (SPI) level shifter circuits.  The device has internal Analog and Digital LDOs to supply the device which are sourced from VS.  Therefore, VDD can be completely disabled along with the MCU when the board is in low power sleep mode.

    The TIC12400-Q1 does not have a "Sleep Mode" but has a reduced current mode called "Polling Mode" which will only enable the wetting current for the period of time needed to make the voltage measurements on the INx pins, and then it will disable the current for the remainder of the polling cycle.  Therefore the current consumption is usually presented as an average current level across the entire polling cycle.

    The polling mode current is the average current over the complete polling cycle where current may flow for a portion of the cycle, but not all of it.  Therefore, the amount of average wetting current will change based on the configuration settings and the external switch states. 

    The datasheet specification gives the specification for one set of conditions where all of the switches are in the OPEN state which means that no wetting current will flow out the INx pins and all of the current will be internal to the TIC12400-Q1.  If the switch is external, or there is a path for current to flow out of the INx pin due to external components connected to the INx pin, then this will be additional current that would be added to the simple calculation tools.  The calculation tools only account for the current flowing through the internal circuits and voltage dividers on the input to the comparator or ADC circuits as an example.

    Changing the polling active time and the cycle time will also adjust the ratio between the amount of time current may be flowing through the device, and how long the device is idle and waiting for the next polling cycle to begin.

    The customer's configuration and INx pin loading may differ from the parameters in the datasheet specification resulting in more or less than 68uA of current.

    There are two polling mode calculators available to help with calculating the polling mode current for different configurations.

    1.) The TIC12400-Q1's EVM GUI is free to download from the product folder (Link) and use without purchasing or connecting an EVM to the PC's USB port.  It has a polling mode calculator in it that will calculate the current based on the device configuration.

    2.) You can also find an excel spreadsheet version in this E2E post. (Link)

    I would suggest the customer use one of these calculator tools to enter their configuration and determine what the average current will be and whether there are any adjustments needed to make their Iq budget.

    Regards,

    Jonathan