BQ24030: Reset, Timers questions

golan kormian

Intellectual 880 points

Other Parts Discussed in Thread: BQ24030, BQ24075, TPS63020

hi,

2 questions:

1. is there any option to perform some kind of RESET to the BQ24030?

2. the component is MSL2. if the reel left open for long time what kind of tritment should i do before SMT assemblly?

over 13 years ago

0 Tahar Allag over 13 years ago

TI__Mastermind 32400 points

You can connect the TMR pin directly to LDO to disable the timer. When VI(BAT)>V(LOWV) all the timers are reset. The charge operation flow chart as in figure 3 in DS and the charge profile is as in figure 1.

Can you please provide us with a more detailed description of what you trying to achieve in you application?

0 Tahar Allag over 13 years ago in reply to Tahar Allag

TI__Mastermind 32400 points

Any updates on this?

0 golan kormian over 13 years ago in reply to Tahar Allag

Intellectual 880 points

hi,

we thought of doing general Reset to the system, when battery is connect permanentlly to the board. meaning Vout at the BQ24030 will be 0 for few ms.

other question:

if i have cut tape of BQ24030, that left not at Vacum package, how should i treat the components befor next SMT assemblly?

as i saw, this is MSL2 component.

0 Tahar Allag over 13 years ago in reply to golan kormian

TI__Mastermind 32400 points

Golan,

You will not need a reset because you should not have that much delay time in the output voltage to detect the battery. See figure 12 in DS.

When you take the component out of the vacuum package or ESD bags, the component should be kept in ESD protected areas.

Thanks

Tahar

0 golan kormian over 13 years ago in reply to Tahar Allag

Intellectual 880 points

ESD is fine.

but the component is MSL2, doesnt we need to dry it at oven befor SMT?

can u check that?

0 Tahar Allag over 13 years ago in reply to golan kormian

TI__Mastermind 32400 points

Golan, will the app note “SLUA271” help?

0 Tahar Allag over 13 years ago in reply to golan kormian

TI__Mastermind 32400 points

Hi Golan,

Can you try to use the bq24075, it has SYSOFF pin that can disconnect the battery fom the system and CE pin to disable the charging, these two features can help you to reset you system. However, the the IC has only one in put.

Let me know if that what you are looking for.

Tahar

0 golan kormian over 13 years ago in reply to Tahar Allag

Intellectual 880 points

hi,

we allready use the BQ24030 - cant change that.

i need to perform electric reset for the device , the BQ24030 is the input main component.

0 Tahar Allag over 13 years ago in reply to golan kormian

TI__Mastermind 32400 points

In that case, you will need an external FET either between OUT pin and the SYS or between BAT pin and Battery. The external FET will allow you to disconnect system from the charger and battery. You may use the CE pin to control the FET and disable the charging at the same time.

-Tahar

0 golan kormian over 13 years ago in reply to Tahar Allag

Intellectual 880 points

hi,

its a problem since the PIC is feeding from the battery - so i might have unstable/unknown enabling siyuation.....

i have a bigger problem - when disabling the TPS63020 i still have voltage at the output of 2V, i dusabled all pins from the PIC (changed them to output) and still voltage is 2V.

0 Tahar Allag over 13 years ago in reply to golan kormian

TI__Mastermind 32400 points

Golan,

Please see figure 19 and 20 in the TPS63020 DS, if the part is disabled, the output current is 0V. It hard for me to explain the 2V you are getting without looking at the schematic.

-Tahar

0 Tahar Allag over 13 years ago in reply to Tahar Allag

TI__Mastermind 32400 points

Hi Golan,

Thanks for sending me the schematic…

The efficiency for the TPS63020 is pretty close to the data shown in Fig 3 on the datasheet.

Can you try disabling or Power save mode of TPS then see if the same power still consumed?

I reviewed your schematic here are my comments:

Make sure enabling and power save circuits are correct.

The IN of the TPS73533 is connected to both 5V and Vout_Charger, is that correct?

You can track the power loss by disabling and enabling the charger, DC-DC converter and then the LDO and see where power lose goes.

Tahar

0 golan kormian over 13 years ago in reply to Tahar Allag

Intellectual 880 points

what is the function of the power saving mode?

should it disable it always?

0 Tahar Allag over 13 years ago in reply to golan kormian

TI__Mastermind 32400 points

Hi Golan,

The PS/SYNC pin can be used to select different operation modes. Power Save Mode is used to improve efficiency at light load. To enable Power Save Mode, PS/SYNC must be set low. If PS/SYNC is set low then Power Save Mode is entered when the average inductor current get lower then about 100mA. At this point the converter operates with reduced switching frequency and with a minimum quiescent current to maintain high efficiency. A full description of power save mode operation is provided on page 14 in the TPS63020 datasheet. And fig 22 shows the power save mode (PFM) and PWM mode. Enable / disable power save mode (1 disabled, 0 enabled, clock signal for synchronization), must not be left open.

-Tahar

0 Tahar Allag over 13 years ago in reply to Tahar Allag

TI__Mastermind 32400 points

Any updates...

Power management

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BQ24030: Reset, Timers questions