ADP5061/62 battery isolation FET

Hi,

(1) battery isolation

Vin = 0V (VBus not connected)

Vbat > Vweak (system is running from battery)

is it possible to isolate the battery from the system load by setting the EN_CHG & DIS_LDO bit via I2C --> total system shut down leading to minimum battery load (5µA right?)? Am I right that DIS_LDO will be reset after Vbus has been connected automatically and so the system would be powered in LDO mode in case Vbus is connected? We are planning to have a fixed soldered internal Lipo cell ... for that we would need the battery isolation/total system shut down (even if VBat>>Vweak) for maximum battery life time (during stock, ...)

(2) SYS_EN

what means 'active' in your datasheet:

- FET==active --> pin pulled low

    or

- active means FET is open and pin is pulled high

is there a SYS_EN mode where SYS_EN is 'active' when Vin>Vin_ok OR Vbat>Vweak (usb connected or good battery) and deactivated if Vin<Vin_ok AND Vbat<Vweak (no usb and low battery) --> if yes (which mode?) I could use SYS_EN to en/disable a buck converter generating the system working voltage (2.7V)?

I have already ordered the eval board but you could help a lot in advance

bests

Thomas

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  • 0
    •  Analog Employees 
    on Mar 3, 2016 9:34 PM

    Hi Thomas, here are comments for your questions.

    1)  To turn off ISOFET, need set reg 0x07 bit[6] and bit[7] to 1. When VBUS connect, reg 0x07[6] and [7] will be reset to 0 and system can be power automatically.

    2) Active is effective or working.

     

    Best regards,

  • 0
    •  Analog Employees 
    on May 29, 2020 6:36 PM in reply to hyao

    To be clear, you cannot manually turn of the ISOFET. You can set the SYS_EN_SET configuration as shown above and use that to disable the load, but that does not force the ISOFET off.

    I'm not sure which bits are being referred to above. Bit 7 of register 0x07 is "not used" so there must be some mistake.

    Regards,
    Zack

Reply
  • 0
    •  Analog Employees 
    on May 29, 2020 6:36 PM in reply to hyao

    To be clear, you cannot manually turn of the ISOFET. You can set the SYS_EN_SET configuration as shown above and use that to disable the load, but that does not force the ISOFET off.

    I'm not sure which bits are being referred to above. Bit 7 of register 0x07 is "not used" so there must be some mistake.

    Regards,
    Zack

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