TPS659xx PMU Forum - Recent Threads

TPS659112

Patrick LE MOULEC — Thu, 23 May 2013 09:28:58 GMT

in the The TPS659112 datasheet, there is a reference to a layout document as follows:" For detailed guidelines, see TPS65911 Layout Guidelines, TI Literature number SWCU080.

I can’t find this file anywhere. Can you send it to me?

TPS65910A3 - Embedded Power Controller - Brown Out Management?

Adam Hoover1 — Mon, 20 May 2013 22:12:07 GMT

Hi Team,

Customer looking for info on if/how the TPS65910A3 PMIC handles brown-out conditions. From data sheet Figure 13. Embedded Power Control State-Machine, the device will clearly transition to the No Supply State if MB and BB drop below VBNPR (~2.1V typ) , but what happens if the part has not fully transitioned and the incoming supply recovers?

1. Will this VBNPR threshold provide enough time for the device to completely transition to the No supply state if power is completely removed?

2. Is is possible to get caught in some irrecoverable transitionary state?

The specific question asked with respect to data sheet Figure 4. Device Turn-On/Off with Rising/Falling Input Voltage:

"Looks to me NRESPWRON is posted before VIO shuts down, so if incoming reappears before VIO is gone, it’s treated like another dead-start?"

3. How long does the IC take to transition to the No Supply State from Active, Back, or Sleep States?

4. How long does the IC need to stay in the No Supply State before starting back up?

If a brown outs are a concern for applications using this part, can you suggest a Power Fail Protection circuit (PFP)?

Thanks,

Adam Hoover

ACAT Support

TPS6595x audio section

shekhar SAINI97194 — Fri, 17 May 2013 12:21:44 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?

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

Jeff Pao — Thu, 18 Aug 2011 19:37:39 GMT

Hi,

We have the following questions regarding TPS65951:

1) How can we set the battery voltage threshold for the PMIC to power on the OMAP? The datasheet for the TSP65951 in table 6-24 talks about "main battery charged threshold" (VMBCH) which is fixed at 3.1V. Not sure if this is the turn-on voltage threshold. Is there any way we can change this?

2) Hands free speaker driver with stereo audio- can they mix to mono?

3) Do we need input and/or output caps for unused LDOs on PMIC?

Thanks,

Jeff

TPS65951 audio problem

Devin deng — Fri, 31 Aug 2012 07:00:45 GMT

Hi Gandhar .

I used the DM3730+TPS65951 to design a board . I played wav files,but can not hear sound from earphone,

I checked circuit per beagleboard schematic, it is ok .Then I checked I2C , I think it is ok, because i controlled one GPIO by it, About I2S signal ,i can observe 48Khz FS Clock and 1.53Mhz Clock on McBSP2 port , i also can observe data. I think they are ok .

I added audio codec ,which comes from beagle board.org, to my software, but I can not hear something from my earphone, Do i miss something?

Please give your advice.

Thanks

Devin

TPS65951 Audio switching if headset is detected

Neeraj Shukla — Thu, 16 May 2013 07:56:12 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!

TPS65950 LDO input voltage

Ryan Milne — Wed, 24 Apr 2013 23:23:13 GMT

When using the TPS65950, is it acceptable practice to power the input to one of the LDOs with a separate power source than the rest of the IC? Specifically, if VBAT is a Li-ion battery ranging 3.0-4.2V, can I apply 1.8 or 3.3V from a separate regulator to VAUX12S.IN and/or VPLLA3R.IN in order to achieve better efficiency with the VAUX LDOs? Or do all regulator inputs to the device need to be from the same source? If I can connect a separate source, is there any power sequencing pattern I should follow at startup or shutdown?

Thanks,

Ryan

TPS65930 USB port in Host mode with VBUS current higher than 100mA

Bartlomiej Swierczek — Wed, 28 Sep 2011 11:11:39 GMT

Hi,

I am working on very board space efficient deign with DM3730 and TPS65930.

We need only one USB port working in HOST mode but capable to power connected device with VBUS current higher than 100mA.

The target board dimensions are very small so we want to use ULPI USB OTG PHY build in TPS65930 .

We have +5V power efficient supply on-board.

There is any suggested (hardware and software) way to use our +5V PS instead of TPS65930 charge pump to power VBUS line?

External Power Supply on USB OTG with TPS65950

Hao Yuan — Wed, 10 Mar 2010 03:17:25 GMT

TPS65950 can only supply 100mA current on VBUS, but we need more current supply to our USB OTG port. On page 23 in the User's Guide of 65950(SWCU056C), it mentioned that "In case there is a need to use an external 5-V supply for larger current needs then one can use an external supply; however, the VBUS pin from the device must be connected to the VBUS pad on the USB connector." So my question is how to design a circuit to implentment the notes mentioned. Can I just connnet a external 5V power supply to the VBUS net betweent the USB connector and TPS65950?

Question about TPS65950's vibrator H-Bridge spec.

Gary Teng — Tue, 30 Apr 2013 10:21:44 GMT

Dear sir,

There's a question from my customer: They see " output resistance max: 8ohm" in Table 6-9 from TPS65950's datasheet and want to know what that is. Is anyone can help to explain that? Thank you very much.

TPS65910A3 vs TPS65910A31 for AM335x

Matteo Geromin — Fri, 03 May 2013 15:19:31 GMT

Hi,

I want to use TPS65910Ax PMIC to power AM335x with DDR3, i notice that there are two devices on this family that supports AM335x and DDR3:

TPS65910A3 and TPS65910A31

In "TPS65910Ax User's Guide For AM335x Processors" i found that the only difference between the two is the VRTC LDO state in PMIC OFF state.

On the TPS65910A3 VRTC LDO is shut off when PMIC is in OFF state

On the TPS65910A31 VRTC LDO is ON when PMIC is in OFF state

I'm right? Are there other differences?

Thanx

Matteo Geromin

TPS659113 RTC: Delay 1s after 20 min

Chris Meng — Tue, 16 Oct 2012 08:05:47 GMT

Hi,

We are using RTC on TPS659113 on IPNC app. We found the RTC time will dealy 1s after 20 minutes compared with PC timer.

Is this reasonable? What's the accuracy of the RTC on TPS659113? What may cause this problem?

TPS65910A3 output voltage margining

Kohei Sasaki — Wed, 01 May 2013 01:23:58 GMT

My customer is thinking to use TPS65910A3 for AM3352.

They require the +5% margining test of all output voltage.

Is it possible to change output voltage by resistor divider?

If it is not possible, is there any solutions?

Problems powering off Beagleboard xM with TPS65950.

Javier Martin19423 — Wed, 13 Apr 2011 15:04:18 GMT

Hi, we have a Beagleboard xM and we are trying to power it off using the TPS65950.

For that purpose, we set the bit DEVOFF of register P1_SW_EVENTS to 1 with the following command:

i2cset -f 1 0x4b 0x46 0x01

However we are experiencing the following issue:

when we enter the previous command, sometimes the board will reset instead of power off, and the behavior seems completely random.

Do you know what could be the problem here?

Thank you.

Android GingerBread- Kernel Build error

PRAJITH WARRIER80347 — Thu, 28 Jul 2011 05:20:10 GMT

Hi,

I have downloaded Android Gingerbread 2_3_4source from TI site.

I am trying to build the kernel, but i am getting an error message when building the kernel.

CHK     include/generated/compile.h
GEN     .version
CHK     include/generated/compile.h
UPD     include/generated/compile.h
CC      init/version.o
LD      init/built-in.o
LD      .tmp_vmlinux1
drivers/built-in.o: In function `composite_unbind':
/home/guest/rowboat-android/TI_Android_GingerBread_2_3_4Sources/kernel/drivers/usb/gadget/composite.c:1205: undefined reference to `switch_dev_unregister'
/home/guest/rowboat-android/TI_Android_GingerBread_2_3_4Sources/kernel/drivers/usb/gadget/composite.c:1206: undefined reference to `switch_dev_unregister'
drivers/built-in.o: In function `composite_switch_work':
/home/guest/rowboat-android/TI_Android_GingerBread_2_3_4Sources/kernel/drivers/usb/gadget/composite.c:1239: undefined reference to `switch_set_state'
/home/guest/rowboat-android/TI_Android_GingerBread_2_3_4Sources/kernel/drivers/usb/gadget/composite.c:1247: undefined reference to `switch_set_state'
drivers/built-in.o: In function `composite_bind':
/home/guest/rowboat-android/TI_Android_GingerBread_2_3_4Sources/kernel/drivers/usb/gadget/composite.c:1300: undefined reference to `switch_dev_register'
/home/guest/rowboat-android/TI_Android_GingerBread_2_3_4Sources/kernel/drivers/usb/gadget/composite.c:1304: undefined reference to `switch_dev_register'
make: *** [.tmp_vmlinux1] Error 1

need help in resolving the above issue.

Regards,

Prajith

RTC Only on Sleep Mode

Joao Dullius — Thu, 25 Apr 2013 17:37:12 GMT

Hello,

We are designing a system in which we would like the VBACKUP to supply only the internal RTC.

In other words, we need to turn off the VRTC during VBACKUP-only operation. We must do this in order to to have a minimal power consumption.

Is this possible with this device?

TPS65930: USB does not work.

pan jian — Thu, 25 Apr 2013 00:08:31 GMT

Dears,

The issue description as follow. TPS65930 can work except USB portion. Such as VDD1, VDD2, VIO, and non-USB LDO are OK. But LDO of USB is not output. CLK of USB doesn't output. 26MHz input frequency is OK.

Is the chip fail? Or how to fixed the issue?

thanks

Why are the filtering capacitors on TPS65950 power providers specified with 20mOhm < RESR < 600mOhm?

Stephen Blake — Wed, 24 Apr 2013 14:24:50 GMT

Dear Forum,

I have specified ceramic filtering capacitors on the TPS65950 power providers, but with a 1uF ceramic capacitor the effective series resistance Resr~6mOhm which is below the lower limit specified in the TPS65950 data sheet. What capacitor technology are TI implying for filtering on the power providers?

Yours sincerely

Stephen Blake

audio haven't singal output with tps65930

jery0711 jery — Mon, 22 Apr 2013 07:06:19 GMT

Hi everyone

my board could output audio signal with tps65950,now i instead it of tps65930.using the same driver ,but the audio couldn't output.

It's said that the software of tps65950 compatible with tps65930. if there was some difference between tps65950 and tps65930 to the audio driver?

if i want to handle the tps65930 to output audio signal,what should i change in tps65950 audio driver? i'm using the android2.3.4 beagleboard-xm

thanks &BR

TPS659xx Power consumption on Beagle

Kant Nagesh — Tue, 16 Apr 2013 07:29:57 GMT

Hello,

I am trying to reduce the power consumption on Beagle board (Linux 3.2.8) when idle / suspend, So I need cut off the power for VAUX2, VAUX3, VAUX4, VUSB1V5, VUSB1V8 & VUSB3V1 on TPS65950 regulator. Can anyone help me on this / please let me know if any other alternate solution.

Thanks & Regards,

K.Nagesh

TPS659112 + DM8168 question

Grzegorz Kasprowicz — Fri, 16 Dec 2011 13:17:00 GMT

I'm designing power block for the DM8168 processor

There is a document whicn describes how to do it : TPS659112 Netra User Guide

and have a few questions:

why do I need additional DCDC to supply CVDDC? Cannot I use VDD1 of the PMIC? It is left unconnected.

The same concerns 0.9-V USB - cannot I supply it from one of the LDOs?

I'd like to simplify the supply as much as possible since I have very little space on board.

Ideal situation would be to use only the TPS659112 and some IC to supply DDR3 VTT , why not to use VDD2 to produce 1.5V for DDR3 and VIO to produce 3.3 for rest of the peripherals?

I assume that such choice was justified by power sequencing limitations, please confirm.

Regards,

Greg

RTC solution for TPS65910A3 + AM335x

Mokh AFM — Fri, 12 Apr 2013 16:46:41 GMT

dear,

i have to assure timekeeping in my customized board based on AM335x and TPS65910A3 but there is a bug related to the RTC for the family AM335x (described on errata 1.0.5), that will be fixed on REV2.0.

1) RTC with AM335x :

a) have to wait the new datasheet in order to verify consumption of VRTC (should not be more than 0.1mA max tolerated by PMIC) ?

2) RTC with PMIC:

a) use coin cell on PMIC for VRTC, and add external oscillator 32kHz. then after power on, read date and hours from I2C.

b) is it possible to activate RTC of PMIC with the only internal RC. so no need for external oscillator ?

c) do you have similar design and configuration using the RTC of PMIC ?

regards,

TPS65910 LDO's internal dissipation (powering AM335x)

Luis Caruso — Thu, 11 Apr 2013 14:29:11 GMT

HI there,

if we look at the internal diagram of the TPS65910, we see various LDOs supporting a great drop of voltage over them.

This is so that the most of the power dissipated by these rails are caused by the internal voltage drop than supplying the target.

There is any recommended measure to get this undesirable power ou of the chip?

I observed that, given the power sequence is not possible to create a cascade of supplies in way to reduce that effect.

Thanks

Luis

TPS659102 for New Generation of Rock Chip Solution

Chu Anson — Thu, 13 Dec 2012 15:22:26 GMT

Dear Engineer,

The TPS659102 is recommended for Rockchip-RK29xx platform,please kindly advise if it can support the newer generation of RK31XX or RK32XX of Quad-core chip solution.What's the current lifecycle status of TPS659102?

Best regards,

Anson

TPS65910 internal dissipation

Luis Caruso — Wed, 10 Apr 2013 15:36:52 GMT

HI there,

if we look at the internal diagram of the TPS65910, we see various LDOs supporting a great drop of voltage over them.

This is so that the most of the power dissipated by these rails are caused by the internal voltage drop than supplying the target.

There is any recommended measure to get this undesirable power ou of the chip?

I observed that, given the power sequence is not possible to create a cascade of supplies in way to reduce that effect.

Thanks

Luis