PMU

Forum Post: tps65217B PMIC SYS pin output problem

ye luo — Sat, 18 May 2013 08:35:00 GMT

Hi,

We are using tps65217B PMIC for powering a custom board based on AM3352 .

The design is not battery powered. The problem is after connecting 5V to the AC, PMIC is starting, The SYS pin output correctly, and VLDO1 output is 1.8V, DCDC1 output is 1.8V, DCDC2 output is 1.1V, DCDC3 output is 1.1V,

But after 2 s the PMIC goes to fault state, SYS pin output and all power rails turned off.

Then repeatly after 2s is ok, after 2s is wrong................

The Attached is Schematic.

pls help me check.

thanks.

Forum Post: RE: Exploiting LP3913 VIN1 input

Kern Wong — Sat, 18 May 2013 06:17:00 GMT

R.,

Have you had a chance to try out the LDOs as LILOs yet? Since they are not designed for this there might be a chance the input protections are not sufficiently isolated or robust enough guarding against latch up or soft latch due to voltage differencials that may bias on parasitic or normally revers-biased pn junctions internal to the die. On the other hand they might have used. Make sure you check the input and output currents so you will account for all of them other than loss due to efficiency (estimate for soft latch). Good luck.

Kern

Forum Post: TPS6595x audio section

shekhar SAINI97194 — Fri, 17 May 2013 12:21:00 GMT

Hello,

In our application we need on board mic, speaker (not earpiece) and headset mic and headset speaker.

We are doing above by using interface available in TPS65951:

On board

Mic: MIC.MAIN.P,MIC.MAIN.M

Speaker: Predrive outputs for 8 ohm speaker with class D amplifier (mono)

Headset:

Mic: HSMIC.P, HSMIC.M

Speaker: HSOL,HSOR

We need headset speaker and headset mic detection in the above explained application. We are using GPIO2 as suggested in TRM for headset speaker detection but for mic detection we are planning to use GPIO1 for it.

Would it be possible to use GPIO1 for the headset mic detection? If yes, is it possible to switch between on board and headset by software?

Forum Post: RE: TPS650250 Powered by Buck Converter

Matt Romney — Thu, 16 May 2013 19:22:00 GMT

Michael,

Thank you for the response. The system runs off of the mains and would need mains power to accomplish its primary function. So the only reason for the RTC is simply to keep time under complete power loss. The AM335x would never be put in the RTC-only mode. Power loss would happen whenever there is a mains outage. Could last for minutes to hours and very rarely days but it would obviously be infrequent. I would like to use a standard cell battery like the CR2032 which isn't rechargeable.

Perhaps this question is better suited for the AM335x forum but I'm a little confused on how the AM335x RTC function would be connected to a cell battery. Do you know much about this?

Thanks

Forum Post: Beagle Bone + TPS65217 query

rajesh ravnikar — Thu, 16 May 2013 13:56:00 GMT

Hi TI ,

I have a few queries on TPS65217.

1.In page 20 of TPS65217 data manual , it is said that LDO_PGOOD output goes high when LDO1 and/or LDO2 are enabled . This is creating a lot of confusion .

Is it and or or??

2. When the TPS65217 is in sleep mode only LDO1 will be on . In that case does LDO_PGOOD be high?

3. To wake it up from the sleep mode if we press the PWR button does the PMIC toggle the WAKE_UP signal and the processor in turn has to come and enable PMIC_PWR_EN signal to enter active state . Is my understanding correct ?

4.Can the device be powered off by pressing the power button of PMIC TPS65217 ? Looking at the datasheet i understand that feature is not possible.

Thanks in Advance.

Best Regards,

Rajesh N

Forum Post: RE: TPS65951 Configuration Questions (VBAT Turn-on, Hands-Free Speaker mix to mono, Unused LDO cap)

Neeraj Shukla — Thu, 16 May 2013 09:16:00 GMT

Hello,

I am working on DM3730 based project in which we are using PMIC TPS65951.

We are using audio codec of PMIC.

In our design we are planning to implement :

On board mic and speaker.
Headset mic and speaker.

My question is that ;

if headset is detected then audio path from 'On board mic and speaker' is automatially switched to 'Headset mic and speaker.'? Just like a case in our mobile phones.
Or do we have to provide external switch to do so?

Thanx in advance!

Forum Post: RE: TPS65951 audio problem

Neeraj Shukla — Thu, 16 May 2013 07:58:00 GMT

Hello Devin,

I am working on DM3730 based project in which we are using PMIC TPS65951.

We are using audio codec of PMIC.

In our design we are planning to implement :

On board mic and speaker.
Headset mic and speaker.

My question is that ;

if headset is detected then audio path from 'On board mic and speaker' is automatially switched to 'Headset mic and speaker.'? Just like a case in our mobile phones.
Or do we have to provide external switch to do so?

Are we missing someting??

Thanx in advance!

Forum Post: TPS65951 Audio switching if headset is detected

Neeraj Shukla — Thu, 16 May 2013 07:56:00 GMT

Hello,

I am working on DM3730 based project in which we are using PMIC TPS65951.

We are using audio codec of PMIC.

In our design we are planning to implement :

On board mic and speaker.
Headset mic and speaker.

My question is that ;

if headset is detected then audio path from 'On board mic and speaker' is automatially switched to 'Headset mic and speaker.'? Just like a case in our mobile phones.
Or do we have to provide external switch to do so?

Thanx in advance!

Forum Post: TPS65217A PMIC IC doubt

prabha krishna — Wed, 15 May 2013 11:39:00 GMT

Dear Sir/Madam,

In our Project we are using TPS65217A PMIC IC. We are giving External power supply i.e 5V then this 5V is given to TPS65217 IC 12th Pin and see the SYS o/p pin no 7 and 8 but we are not getting 5V i.e 0.269V is coming. I saw the TPS65217 datasheet but i did not get anything. can you please give me the your valuable feedback.

Thanks&regards,

GKP

Forum Post: How to power on tps65910 by the RTC alarm(INT1)?

love-linux — Tue, 14 May 2013 14:39:00 GMT

Our projects have been used the PWRON button to control power, but we also want to power on PMIC by RTC alarm, how to deal with it,in circuit and software?

Forum Post: TPS65051 can support Freescale IMX258?

sky Huang — Tue, 14 May 2013 08:35:00 GMT

Dears,

I have found out TPS65051 can support Freescale IMX25.

Let me confirm TPS65051 also can support Freescale IMX258, right?

Sky

Forum Post: PMIC Power Consumption for light load

Jayden Park — Tue, 14 May 2013 03:02:00 GMT

Hi~

Out customer use TPS65270. Our customer have power consumption spec for light load.

Vin : 12V, Vout1 : 3.3V, Vout2 : 1.5V

Our customer search part to meet follow condition : Light Load : 10mA => Efficiency 80%

Please recommend part and another solution.

Forum Post: RE: TPS65950 LDO input voltage

Puneet Sehgal — Mon, 13 May 2013 14:46:00 GMT

Ryan,

Device is not designed for this kind of use case. All supplies should be connected together.

Thanks,

Puneet

Forum Post: RE: TPS65930 USB port in Host mode with VBUS current higher than 100mA

Srinivas Marakala1 — Fri, 10 May 2013 11:31:00 GMT

Yes, it might damage PMIC. Unfortunately we could not turn off the internal charge pump using SW. Though you do it through registers, it is getting enabled back.

To solve this issue we connected diode on the VBUS path which allows current flow in one direction.

Thanks,

Srinivas

Forum Post: TPS65051-Q1 Q100 test report

Dan Lu — Fri, 10 May 2013 09:00:00 GMT

Dear support team,

Is there any Q100 test report that we can share with customer for reference? The datasheet stated the Q100 spec below:

AEC-Q100 Qualified With the Following Results:

– Device Temperature Grade 1: –40°C to 125°C Ambient Operating Temperature Range

– Device HBM ESD Classification Level H2

– Device CDM ESD Classification Level C3B

Could you kindly share the document with related test result?

Thank you!

Best Regard,

Dan Lu

Forum Post: RE: External Power Supply on USB OTG with TPS65950

makoto fujimoto — Fri, 10 May 2013 02:13:00 GMT

Hi.

I also have a design where OTG is always a host and I am using external 5V Power Supply that is connected to VBUS pin and to the connector.

In our products,charge pump capacitor is equipped. And when we use USB devise powerd by external 5V,an unexpected current flows into VBUS pin of TPS65930.

For resolving this problem,we will remove charge pump capacitors.Is it OK?

(To tell the truth,we want to resolve this problem by changing software only. How can we resolve it?)

But many of our products have were shipped already,it is difficult for us to remove charge pump capacitor from now.

Our products hardly use USB funtion.USB is used to upgrade its software. For example, we use USB function in our product for 15miniutes per a month or so.

The rest time we don't initiate USB driver in our product,and both of internal charge pump and external 5V are OFF.

In that case,are there any troubles in TPS65930? Do we have to remove a charge pump after all?

According to our evaluation,if both of internal charge pump and external 5V are on simultaneously,an unexpected current(about 20mA) flows into VBUS pin of TPS65930.

And a surface temperature of TPS65930 increased 5 degrees.All of our products (quantity about 1000) looks operating correctly now.

Forum Post: RE: tps65381-q1 multi rail power supply

Madhu Vatte — Thu, 09 May 2013 02:44:00 GMT

Hello Jeffery,

You are right, I was looking for the load dump protection.Thank you for the response and also the app note.

Thanks,

Madhu

Forum Post: tps65217B PMIC start up problem

Mehdi_ — Wed, 08 May 2013 08:12:00 GMT

Hi,

We are using tps65217B PMIC for powering a custom board based on AM3359 (We used Beaglebone as a reference ). The design is not battery powered. The problem is after connecting 5V to the AC, PMIC is starting, the LDO_PGOOD gets high(VIO is 3.3V) and VLDO1 output is 1.8V, but after ~1 s the PMIC goes to fault state and all power rails turned off. We have an LED connected to the VLDO2 to check the PMIC state, it just turns on for a second and then turns off. We disconnected all the loads on rails to ensure that it is not a shorted output. We evaluate the OVT condition as well with increasing the voltage to 6 volt which the PMIC responded correctly. We tried to disconnect the AM3359 from the PMIC (VRTC on VLDO1 and other power rails ) and setting PWR_EN to high using VLDO1(1.8v) manually but same thing happened and the PMIC turned off after one second operation and all the power rails, LDO_PGOOD and PGOOD went down. Could you please give me some tips to solve the problem?

Forum Post: Tps65090 question

Eric Ho — Mon, 06 May 2013 16:26:00 GMT

Dear All,

I have some Tps65090 question,

a. If customer wanna use 3S battery, how do i design the FBC pin resistor??

b. For TS pin design, could I combine two to one to sense?

c. For the input R-sense & output R-sense, the EVM design is 10mohm, if customer wanna change to 15mohm or 20mohm, do we need to change software code or not?

Thank you

Forum Post: RE: Question about TPS65950's vibrator H-Bridge spec.

Gary Teng — Mon, 06 May 2013 09:31:00 GMT

Is anyone know the meaning of "output resistance" in TPS65950's vibrator H-bridge output?