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BQ51050B: BQ51050B: understanding TS/CTRL functionality

Florian Uhlich
Prodigy 40 points
Part Number: BQ51050B

Tool/software:

Hi,

we want to use the BQ51050B in a design. We don't use a NTC but have a different temperature sensor on the pcb that's connected to our host MCU.

How do we stop the charging from the MCU? Do we need to pull the TS/CTRL pin high or low? Do we need a pull-up or pull-down resistor or a voltage divider? the data sheet is a little bit confusing regarding the CTRL function.

Cheers

  • 0
    TI__Guru* 75656 points

    Hi Florian

    Florian Uhlich said:
    How do we stop the charging from the MCU? Do we need to pull the TS/CTRL pin high or low?

    Pulling the TS/CTRL pin high will send EPT00 (Unknown) which would be good.  Figure 8-15 is a possible circuit to use.

    Also using the AD pin as a shutdown input is an option.  It will send EPT00 also but need to pull the pin above 3.6V

  • 0 in reply to Bill Johns
    Prodigy 40 points

    Can I use a 10k resistor to GND on TS/CTRL and a connection from TS/CTRL to the digital pin, configure it as an input (with an internal 100k pull up) during normal use and set it as an output and pull it down when overtemperature is detected?

  • +1 in reply to Florian Uhlich
    TI__Guru* 75656 points

    Hi Florian

    Florian Uhlich said:
    Can I use a 10k resistor to GND on TS/CTRL and a connection from TS/CTRL to the digital pin, configure it as an input (with an internal 100k pull up) during normal use and set it as an output and pull it down when overtemperature is detected?

    This should work, try to keep leakage current into the MCU as low as possible.