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BQ2014 DONE Pin Specification

hideyuki sakai
Mastermind 6250 points
Other Parts Discussed in Thread: BQ2014

Dear, Sir.

My custoimer already started system mass-production applying BQ2014.

They are facing several % system field failure which is related to the device.

DONE pin is pull-down to Vss by 220kOHM resister according Datasheet & it is

controlled by MSP430 GP I/O. 1kOHM dumping resistor is also located

on the interface.

System failure phenomenon is ;

FLGS1 bit(3), VDQ never change to "1" even if DONE input Ｌ=>H by MSP430.

The bit is monitoring by MSP430, so system shut-down is occurred at time-out

(The bit never change to "1" during long time).

1. I can not find any DONE pin specification on the datasheet.

   Could you let me know that, such as Vih/vIL, i souce/Isink?

2. Please give your advice about potential cause relating to the failure phenomenon.

Best Regards,

H. Sakai

  • 0
    TI__Guru 73830 points
    Sakai,
    This is an older device and I do not have much information on it. VIH = 2.5V min and VIL = 0.5V max. Is the input from the charger or host greater than 2.5V?

    Tom
  • 0 in reply to ThomasCosby
    Mastermind 6250 points

    Dear,Tom-san. 

    Thank you so much for your help. 

    MSP430 GPI/O(3.3V VDD)　is connected to DONE pin on BQ2014. 

    The high level is enough higher than 2.5V according the waveform(almost 3.3V). 

    It is a big question reason why VDQ(FLGS1 bit3) never change to "1". 

    Do you have any idea about the cause influenced on this phenomenon? 

    Best Regards, 

    H. Sakai