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Thread: FAQ for miscellaneous Embedded Power IC Topics

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    FAQ for miscellaneous Embedded Power IC Topics

    The 100 Times-Programmable Page (short: 100TP) can used to store application relevant data, like configuration data, e.g. application variants information, calibration data, etc.
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    What is the recommended Vs Cap value in order to increase the system availivility tim

    The Vs cap can be used to keep the device supplied to a defined period of time in case of the power loss (VBAT loss) scenario. The addition working time could be used to store application relevant data into the data flash. The size of the Vs cap is calculated by "C = I * t / U". I is the current consumption of the device, e.g. 30mA. t is the time the device should stay active, e.g. 16ms. And U is the voltage delta between the starting voltage of the cap and the reset voltage of the device, e.g. 9V - 3V = 6V. The capacitance will now be: C = 30mA * 16ms / (9V - 3V) = 80µF.
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    Which is the maximum quiescent current of device?

    The quiescent current depends on the operation mode of the device. The "sleep mode" provides the lowest quiescent current, which is the range of double digit µA. Please refere to the datasheet for absolute values.
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    What is the difference between the (external) window watchdog WDT1 and the integrated

    The integrated WDT is inside the microcontroller core, while the WDT1 is located in the system control unit of the device. While the WDT1 is mandatory for automotive applications and cannot be disabled (except for debug mode and stop mode) the WDT is completely controllable by software and freely available to the user application.
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    Which is the purpose of the OTP pages?

    The One-Times-Programmable Page (short: OTP) can used to store application relevant data, like configuration data, e.g. application variants information, calibration data, etc.
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

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    Has Vs to be protected externally?

    The max ratings must be obeyed. A diode is recommended in the Vs net before the Vs cap to prevent the Vs cap from being discharged by others than the device itself.
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    Does the Vs pin needs to be electrically protected externally?

    The max ratings must be obeyed. A diode is recommended in the Vs net before the Vs cap to prevent the Vs cap from being discharged by others than the device itself.
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

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    What is the difference between the 10bit ADC(1) and the 8bit ADC2?

    The ADC1 is a completely software controlled ADC fully available to the user application. While the ADC2 is a diagnostic ADC which supervises the voltages/temperatures in the device. Programmable thresholds for each channel (voltage) provides a user adjustable generation of interrupts in case a measured voltage is crossing the thresholds.
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    How can I write (flash) to 100 Time Programmable Memory (100TP) of TLE9844-2QX?

    TLE9844-2QX has 768 Bytes of 100TP. The Firmware supports the write operation with the help of two functions.
    • user_nvm_100tp_read
    • user_nvm_100tp_write
    For further information, please refer to “TLE984x Firmware User Manual” under User Manual in the below link.

    https://www.infineon.com/cms/en/prod...qx/#!documents
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

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    Does TLE9879 power sequence meet LV124 automotive test standard?

    The TLE9879 is tested according to LV124 test standard.

    Is there incorrect LIN communication mode when VS (voltage slope) rise times are slow during TLE9879 power-up sequence test?

    In the car, we expect every possible voltage slope and transition. Even slower slopes should not have an influence on the functionality.
    When voltage slope transitions are slow during power up sequence test, if the transceiver is in LIN Normal Mode (LNM) instead of LIN Receive Only Mode (LROM), VS undervoltage can be triggered, which causes the LIN to go in Receive-only mode.

    LNM to LROM transition is also executed when:
    • MODE is configured to LIN Receive-Only Mode or
    • Feedback signals of Mode and Slope Mode are not ok or
    • VS undervoltage flag (VS_UV_STS) is set or
    • LIN transceiver OT_STS or OC_STS are set or
    • TXD_TMOUT is set

    LROM to LNM transition is executed when:
    • MODE is configured to LIN Normal Mode and
    • Feedback signals of Mode and Slope Mode are ok and
    • VS undervoltage flag (VS_UV_STS) is not set and
    • LIN transceiver OT_STS and OC_STS are not set and
    • no TXD_TMOUT is set

    For further information, please refer to the TLE987xQX User Manual (Page 651) under User Manual in the below link.
    https://www.infineon.com/cms/en/product/microcontroller/embedded-power-ics-system-on-chip-/3-phase-bridge-driver-integrated-arm-cortex-m3/#!documents
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

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