BQ34Z100-G1: CE pin

Big Bill

Expert 1980 points

Part Number: BQ34Z100-G1
Other Parts Discussed in Thread: BQPRODUCTION,

Dear All:

do you think the CE pin can be floating? why i measure the CE pin voltage is 0.8V at floating condition？ Thanks~

over 7 years ago

0 Miguel Angel Rios over 7 years ago

TI__Expert 4640 points

Hi Bill,

From the looks of it this should be bias to REGIN. I am finding out more into why.

Thanks

Miguel

0 Big Bill over 7 years ago in reply to Miguel Angel Rios

Expert 1980 points

Dear Miguel:

can you supply the CE Pin internal circuit? I can't see the VIH VIL parameter from the datasheet, at present i have 1/30 products that

have the following problems:

As shown in the schematic diagram, the CE pin is floating, I measure the voltage is about 0.8V with multimeter, normally the voltage should be 1.3V. when i burn the CE pin with a electric soldering iron, the wrong voltage is back to normal. I am sure that is not cold solder. can you explain this for me? thanks ~

In addition, Can you provide some tools for mass production ? can the Bqproduction help me? Thanks~ Looking forward to your reply.

0 Miguel Angel Rios over 7 years ago in reply to Big Bill

TI__Expert 4640 points

Hi Bill,

I don't follow in general the CE should not be left floating as it powers the part internally.

Also yes bqProduction should be used for mass production.

You can use this doc as a guideline: http://www.ti.com/lit/pdf/slua665

Thanks

Miguel

0 Big Bill over 7 years ago in reply to Miguel Angel Rios

Expert 1980 points

Dear Miguel:

thanks for your reply, but I want to know what cause the phenomenon that "when i burn the CE pin with a electric soldering iron, the wrong voltage is back to normal" can you help me? Thanks~!

0 Miguel Angel Rios over 7 years ago in reply to Big Bill

TI__Expert 4640 points

Hi Bill,

touching the CE pin which is a high impedance pin seems to be causing either a change in leakage currents which are sensitive to temperature or the soldering iron would cause a change in voltage which would then cause the voltage to change at that pin.

In general we can't recommend that it is ok to leave this pin floating. It should be either attached to GND or to REGIN to either shut it down or power it up, respectively.

Thanks

Miguel

0 Big Bill over 7 years ago in reply to Miguel Angel Rios

Expert 1980 points

Dear Miguel:

thanks for your reply， i forgot tell you i burn the CE pin with a electric soldering iron without the BQ34Z100-G1 power on. and the CE pin voltage is measured after the power on.

0 Miguel Angel Rios over 7 years ago in reply to Big Bill

TI__Expert 4640 points

Hi Bill,

OK so have i answered your question?

Thanks

Miguel

0 Miguel Angel Rios over 7 years ago in reply to Miguel Angel Rios

TI__Expert 4640 points

Hi Bill,

i will be closing this request due to inactivity. If we have not answered your question then please enter a new request.

Thanks

Miguel

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BQ34Z100-G1: CE pin