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IWR1443: typical delay time from power up to normal operation

Hayden Kim
Genius 15580 points
Part Number: IWR1443
Other Parts Discussed in Thread: TIDEP-0091

From data sheet, I can check device wake-up sequence.

When waking up, there is time requirement of SLICER_REF_CLK stabilization, about 5ms.

Before normal operation, firmware image loading time is also required.

The loading time will be different according to the firmware images size.

So, can I know the typical total delay time from device power up to normal radar operation?

Best regards,

Hayden

  • 0
    TI__Mastermind 37500 points

    Hello Hayden,

    This depends on several items, we are working on a project for low power level sensing, where we are trying to reduce the time to boot, and the time to measurement.

    On the ES2.0 device, the boot Rom programs the QSPI clock for 18Mhz, on ES2.0 (current samples) the device loads the BSS and MSS code to the R4F processors RAM.

    If you use the size of the SDK 1.05 .bin files, this is ~290 Kbytes.   On the newer devices, ES3.0, the BSS RF4 code is in ROM, and the QSPI clock runs at 40Mhz.   There are also changes being worked on for code optimization, and API optimization to reduce the time / power further.

    On the TI website, the initial work in this area is under "Power Optimization for IWr1443 77Ghz Level Transmitter Reference Design"   www.ti.com/.../TIDEP-0091

    This reference design, uses a modified IWR1443 EVM, and MSP432 EVM Host Processor.  There is example code for the first level reduced software, and using PMIC_Enable, GPIO0, and HOST_Interrupt you can measure the amount of time for BOOT, RF Calibration & Measurement.  The current ES2.0 design TIDEP-0091 in the software takes 155ms for BOOT from QSPI and code loading, and takes 35ms for the RF Calibration and Measurement.   The boot time is expected for ES3.0 devices to reduce by at least 4x, the actual measurement needs to wait for the device fabrication.

    Related to battery power, you need to evaluate how many radar sensor samples are needed per measurement, how often the measurement is needed, the battery discharge, charge cycles, and the power for boot and measurement.   The level sensing project would not be battery powered, it would store energy from the +24v excitation voltage, and ~once per second, use the stored energy for a short duration measurement.

    Regards,

    Joe Quintal