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BQ40Z50-R1: Application issues

zhong susan
Prodigy 240 points
Part Number: BQ40Z50-R1
Other Parts Discussed in Thread: BQ40Z50

Tool/software:

Hi

1. When using the BQ40z50 gauge, can the PBI pin of the guage be used to power the EN pin of the LDO to control the opening and closing of the LDO? If PBI can power the LDO pin, can a 51k pull-up resistor be connected as shown in the Figure 10?

2. Is the PBI pin of the gauge only low when the guage is turned off, otherwise the voltage of PBI will always be equal to VBT or VCC voltage

  • 0
    TI__Mastermind 28450 points

    Hi Susan,

    zhong susan said:
    1. When using the BQ40z50 gauge, can the PBI pin of the guage be used to power the EN pin of the LDO to control the opening and closing of the LDO? If PBI can power the LDO pin, can a 51k pull-up resistor be connected as shown in the Figure 10?

    We do not recommend using the PBI pin in this type of situation due to it being a power back up. It might be better to use the GPIO functionality available on the R5 version of the firmware, where if the LED pins are not in use they can be used as GPIO for external functionality.

    zhong susan said:
    2. Is the PBI pin of the gauge only low when the guage is turned off, otherwise the voltage of PBI will always be equal to VBT or VCC voltage

    I believe this is correct.

    Regards,

    Anthony

  • 0 in reply to Anthony
    Prodigy 240 points

    Hi Anthony

    1. Is it possible to design the schematic in this way?


    2. Does this design have any software requirements for the guage, and does it require the host to send configuration data to the guage
    3. Requirements for enabling LDO of the IO port of the guage

    1) As long as the guage is not in the shutdown state, the LEDCNTLC pin will always be at a high level
    2) If the LEDCNTLC pin is enabled to high level, what is the voltage value
    3) The guage enters the shutdown state, and the LEDCNTLC pin remains at a low level

  • 0 in reply to zhong susan
    TI__Mastermind 28450 points

    Hi Susan,

    zhong susan said:
    1. Is it possible to design the schematic in this way?

    Can you please go more in depth about the two diodes on the BAT line? 

    zhong susan said:
    2. Does this design have any software requirements for the guage, and does it require the host to send configuration data to the guage

    Once the gauge has been programmed, there should be no need to configure it while in application. If you are able to communicate to it using the communication lines during configuration that should be enough.

    zhong susan said:
    1) As long as the guage is not in the shutdown state, the LEDCNTLC pin will always be at a high level
    2) If the LEDCNTLC pin is enabled to high level, what is the voltage value
    3) The guage enters the shutdown state, and the LEDCNTLC pin remains at a low level

    The LEDCNTLC will not be at a high level at all times. The LED functionality relies on the DISP pin receiving a high to low transition, where then the LED will be on for the amount of time detailed by the LED Hold Time.

    Regards,

    Anthony