Power Management ICs for OMAP™ Applications Processors

TPS65930 USB ID pin connected to 3.1V externally work around to put the OTG port in a peripheral mode

Mohsen Khayami — Wed, 18 Nov 2009 18:00:09 GMT

Champs

My customer has connected the ID pin on the USB connector to 3.1V. It was a mistake but they like to know if there is any work around to make the OTG port to work as a peripheral. If there is any register bit that can be set to over come this. Please let me know.

I notice a bit in the OTG_CTRL that say IDPULLUP and if set to 0 it says it disables the sampling of the ID pin but it does not say it removes the PULLUP. Would this work or maybe some otehr register bits.

Thanks

Regards

Mohsen

tps65920 VIO at power up a 0.6V ripple above the 1.8V is that normal

Mohsen Khayami — Thu, 19 Nov 2009 02:54:42 GMT

All

My customer is seeing a ripple on the 1.8V VIO as high has 0.6v when his system power's up. It goes away after he boots the OS (Wince). This does not make sense to me but wondering if you guys have seen this or know what can casue this. Is it possible that maybe the internal 3Mhz clock is not stabel yet but if that was the case then the VDD1 adn VDD@ should ahve the same problem? Any thoughts on this. I ahve asked the customer to send us a scope picture when the system power's up. Let me know what else you guys want to see.

Thanks

Regards

Mohsen

USB ID pin connection

Antony Lin — Thu, 05 Nov 2009 02:48:14 GMT

In the Data Manual, we suggest "Connected to VUSB3P1 if not used" for USB ID pin.

What does it mean of "if not used"? Does it mean "USB" not used or "OTG" not used?

Why does it need to connect to VUSB3P1 in this case? Can't we keep it floating?

Thanks,

Antony

TPS65950 - RTC wake up on predefined counter / alarm

Keith Keller — Mon, 16 Nov 2009 22:14:50 GMT

Hello,

Customer is looking for more in-depth information on RTC capabilities. Specifically how it can wake up on a predefinded counter / alarm.

Would there be a document with more information?

Original email attached.

Thanks, Keith

TPS65950 - nSLEEP connected to CLKREQ ?

Keith Keller — Mon, 16 Nov 2009 22:22:43 GMT

Hello,

Customer has found an inconsistency between the OMAP EVM Schematic (TWL4030) and "Hardware Connectivity swcu056a" connections for CLKREQ and nSLEEP1.

From my review of the tps65950 data manual, it looks as if the Hardware Connectivity SWCU056 document is the correct implementation.

Please let me know if this is correct. original email attached.

Thank you, Keith

TPS65930/20 digital signals IO current drive

Mohsen Khayami — Wed, 18 Nov 2009 15:41:12 GMT

All

I could not find in the data sheet the current drive for the digital IO's signal on the TPS65930/20. Please let me know the values.

Regards

Mohsen

TPS65950: Audio questions (speaker impedance)

Gandhar Dighe — Fri, 13 Nov 2009 20:21:10 GMT

Q: Is it OK to use mic_sub as a separate source (mutually exclusive) from mic_main as shown?
A: Yes, it is fine. In this case you will use the associated amplifier and filters. Software will have to ensure that the steams should be separated. I don’t know what is the use case. This is generally used for noise cancellation.

Q: On the output side, I'm trying to use the handsfree output for the handset. Typical handsets receivers (speakers) appear to be ~150 ohm. The datasheet lists the min/max load as 6/8 ohms. So can I put a resistor in parallel with the receiver to get 8 ohms as intended, or do something else?
A: Higher impedance speaker is ok. However, this will reduce the power (will reduce efficieny) and the customer will need to check that the available power is going to be sufficient on his application.

Q: Similar to above, for the headset RJ11, I'm planning to drive from ear output. Again the load is 150 ohm. The datasheet shows 26/32, min/typ.
A: Same as above.

Power Up Problems with TPS65950

Ken Gudan — Mon, 02 Nov 2009 22:50:01 GMT

Hello: I'm using the OMAP 3503 and the TPS65950 on a Gumstix Overo Air module. The modules, and my baseboard, are working fine, stable, reliable. We have a TI MSP430 power controller that is powered on all the time, but controls +3.3V_Main to the Overo module.

Normally, everything works fine. But very rarely, on about 10% of our units, when +3.3V_Main is enabled, the PMIC does not enable core power to the OMAP, so the system does not boot.

VBAT to the Overo Air module (to the PMIC) is connected to the same +3.3V power that the MSP is powered by, and is on all the time. We are actually floating SYSEN and PWRON to the PMIC (is this ok?).

I can recover the system by killing VBAT on a lab bench, but this is unacceptable as an embedded system.

Can you please help brainstorm what might be going on here? I couldn't find any clues in the Gumstix forums, so I decided to check TI directly. Thanks very much.

TPS65950 - BCI - In-rush current

Winning_Eleven_8 — Thu, 12 Nov 2009 11:11:49 GMT

Hi,

one of my customer - wants to use TPS65950 to power up one OMAP. They would have like to use TPS65950 is the configuration A described on page 116.

What I would have like to know is:

- what is really CV mode?

- why in CV mode the in-rush current has to be limited by the wall plug? Can it be because the TPS65950 does not integrate DDPM like the BQ24032A has?

Thanks!

Leon.

DP DM short detection

Antony Lin — Mon, 09 Nov 2009 08:18:55 GMT

What is the programming procedure for short detection between DP & DM? Can it be done without 5V on VBUS?

Thanks,

Antony

TPS65020 for OMAP 35x power up

Danny Yugsi — Fri, 06 Nov 2009 14:28:57 GMT

Hi,

Can TPS65020 be used to power up an OMAP3503? I am looking for a PMIC solution that will not need a 32KHz to start up.

Thanks,

Danny

TPS65930 EXTEST MODE

jmleske — Wed, 04 Nov 2009 16:57:03 GMT

Do you have any information on putting the TPS65930 part into extest? We have a macro to put the part into extest mode in order to exercise some of the pins, but it is toggling the NRESOMAP pin, which of course screws up the scan chain.

TPS65930 PWRON

Sieow Ooi — Wed, 14 Oct 2009 17:08:59 GMT

Hi!

I am using TPS65930 to power-up OMAP3503. I have it connected as recommended by the hardware connectivity document available on TI website. One difference will be the nreswarm signal. No pushbutton there, just a pull-up. I also have a momentary switch on the PWRON signal of TPS65930. When I tried pressing the PWRON pushbutton, the processor stop executing. Upon releasing PWRON, I do not see any nrespwron signal being generated and the software does not boot up. A complete power cycle fix this issue but apparently PWRON just killed the processor and do nothing else. Am I missing something?

Please advise as soon as possible if you can.

Thanks!

TPS65950: Automatic and SW charging

Gandhar Dighe — Wed, 11 Feb 2009 05:30:14 GMT

Q: How to enable automatic and software charging?

A: Automatic charging - No register setting is necessary. Plugging an AC charger with a battery connected will start charging. If charging doesnt start the please make sure that GPBR1 is set to 0x90. Due to some setting (sysboot or ROM code on OMAP) this register is over written to 0x00. This disables the MADC clocks and charging doesnt function. For OMAP info please get help from your local contact (FAE, community).

Software charging - For enabling SW charging -

BOOT_BCI = 0x30
BCICTL1 = 0x1B
BCIMKEY = 0X25

USB Charging / Device Powering

David Peverley — Fri, 23 Oct 2009 18:00:39 GMT

Hi All,

In our design we intend to charge via USB and we don't have an AC Charger at all. We've based the schematic on sample (C) from the data manual.As we're not using AC charger PCHGAC is grounded and ICTLAC1/2 are floating as reccommended. BCIAUTO is grounded through 196K. I think I'm missing something obvious as I don't see any charging activity.

In the bootloader (with a powered USB cable plugged in) I dump BOOT_BCI and it reads as 0x35. i.e. (BCIAUTOWEN | CONFIG_DONE | Reserved | BCIAUTOAC) Interesting as in section 7.4.1.1.1 of the TRM an Rbciauto of > 140K should set both CVENAC and BCIAUTOAC. Also I'd have expected CVENAC to be set and BCIAUTOWEN not to be set...

After that I attempt to set BCIAUTOUSB to allow USB charging and I then dump pertinent regs :

BOOT_BCI ............ 0x36
BCIMDEN ............. 0x00
POWER_CTRL .......... 0x00
STS_HW_CONDITIONS ... 0xc0
BCIMSTATEC .......... 0x00
BCIMSTATEP .......... 0x00
BCIVBAT ............. 0x0001
BCITBAT ............. 0x0000
BCIICHG ............. 0x0000
BCIVAC .............. 0x0000
BCIVBUS ............. 0x0000
BCIMFSTS2 ........... 0x80
BCIMFSTS3 ........... 0x40
BCIMFSTS4 ........... 0xf0
BCICTL1 ............. 0x00
BCICTL2 ............. 0x00

I'm feeling a bit confused here as I'm not sure what direction to head in! Has anyone else had any joy with USB charging? I've seen a few posts where people are doing (D) with both AC and USB but not solely USB charging.

Cheers,

~Pev

Does the TPS65950 charger really work?

MikeW — Fri, 07 Aug 2009 21:49:52 GMT

Hello,

I've been trying to get the battery charger interface working and the results are less than amazing. The schematic is identical to the one in the datasheet. It is the dual path (AC and USB) with CV mode possible and the 850mA current limit at startup circuit. There's no deviation from the design. BCIAUTO has a 162K ohm resistor to ground which should allow CVM and auto charging in hardware. ADCIN0 is grounded and ADCIN1 can be connected to a thermistor.

On some previous board revisions, I did manage to get the full 1.7A to pass (power supply reported it as 1.78A) through the FETs which was divided up between the running system (about 450mA) and the battery (the balance of 1.33A to the battery). Those results were on some 4030 samples and we now use the 65950 part but I still have boards with both and it doesn't make any difference. Obviously I don't want that much current going to the battery and I want to be able to restrict it to about 800mA maximum.

On more recent boards, the charger will not activate in hardware at all with the thermistor attached. I have to float ADCIN1 in order to get the charger to activate at all. Without the thermistor I can get about 700mA or so to go to the battery when the cell voltage is quite low. As the battery charges, the current keeps dropping. With the battery at 3.3V, I saw 1.4A of charge current. At 3.7V it was 1.1A. At 3.8V it was 1A and then it starts dropping much faster. By 3.9V it is down to 0.4A. At 3.935V the charge current was 241mA. It then just keeps plummeting down to 70mA at 3.98V.

The charger doesn't really make sense to me. First with the thermistor and second I thought the charger was supposed to be constant current until the voltage is at the cell maximum (4.2V) and then it switches to constant voltage which shuts off when the current level goes below the cutout threshold. I'm not the software guy so I don't know exactly what all of the registers should be doing but I had imagined the hardware more was more predictable.

Are the results I am seeing accurate and we must get software going to handle proper battery charging for the entire cycle? What happens if the processor locks up during charging? I want to rely on the hardware much more than I do the software. What could be going on with the thermistor? It is the standard 10K NTC type and I think it is very close to the one used in the default tables.

Thanks!

TPS65950 TPS65930 TPS65920: Simultaneous USB power and USB function

Gandhar Dighe — Fri, 23 Jan 2009 16:53:25 GMT

Q: Can USB be used to provide power and simultaneoulsy be used for USB functions?

A: This is possible. This is done on the Beagle board and you can check the schematic for this. There is a restriction though – you can use only client mode in this case. For the host mode you need to get the 5V supply from the power management device (charge pump) and pin4 on the USB connector then should be grounded. To power up the charge pump the device needs to be turned ON with another power source.

Please see implementation on Beagle board - www.beagleboard.org

TPS65930 RTC Time register Access issue

Rejo Joe Mathew — Mon, 02 Nov 2009 09:13:47 GMT

Hi there,

I am currently working with TPS65930 along with the OMAP 3503 based design. We are unable to access the Time and calender regsiter (Write functionality). We have pulled up the Msecure to 1.8 volt . We observed that we were able to write into the RTC control register.

Please do let me know if there are any further settings that need to be done

Thanks & Regards

Rejo

TPS65920 hard coded I2C address

Amit Benjamin — Sun, 25 Oct 2009 19:47:21 GMT

Hi,

could you help answer the following question regarding the attached sentences from the datasheet?

have a question regarding I2C on TPS65920. The component's DS reads:

What does "hard-coded" mean? Does it mean the slave address can't be configured by software? How do I go about choosing one address?

What is the "ID5" address?

Thanks,

Amit

TWL4030 Compensation techniques

Gandharva Kumar — Mon, 12 Oct 2009 04:56:06 GMT

My customer has the following doubt; does anybody know of any other technique to compensate the RTC of TWL4030.

The purpose of this mail is to explore the techniques available for compensation of drift in RTC Timing. The conventional approach suggested in http://focus.ti.com/lit/an/swca024/swca024.pdf is by gating the high frequency clock with the 32KHz clock as shown in the below diagram. Then, obtaining the count of the high frequency clock after gating. The count thus obtained indicates the degree of the drift. This approach requires an additional hardware for Anding 32KHz and high frequency clock. We would like to know TI experts’ opinion, on any other techniques using which we can generate the compensation values for the RTC-TWL4030 assuming both 32KHz and high frequency clocks are available and the best suited technique with and without additional hardware for computing the compensation values.

Does TPS65930 support Stero MIC input?

DBian — Mon, 14 Sep 2009 02:23:18 GMT

Dears all,

From the feature list, TPS65930 has cut some audio features, for input path, it mentioned as only support MONO input, but from the diagrams and datapath, there are 2 ADCs, so it's possible to support STERO analog audio input with AUXR + MIC_MAIN? or that's 2 interface only select one at the same time, please help to confirm.

Thanks & best regareds,

David Bian

TPS65950 BOOT_BCI register question

Bob Rubendunst — Thu, 29 Oct 2009 14:54:25 GMT

The TRM shows that BOOT_BCI bit 5, BCIAUTOWEN, is read only. The lowest three bits in this register state "Must have PI_BCIAUTOWEN=1 to enable the write access".

I have two or three questions:

1. Is BCIAUTOWN equivalent to PI_BCIAUTOWEN?

2. Is BCIAUTOWEN really read only?

3. If BCIAUTOWEN is read only, how is it set?

TIA,

Bob

Digital loop voice. Errata in TPS65950 TRM

Subhasish Ghosh — Tue, 27 Oct 2009 11:41:30 GMT

Hi,

On Fig 14.7(Voice/Audio Option 2 (OPT_MODE = 0) Block Diagram) of the TPS65950 TRM, I found the Voice Digital Loop (Marked with the Light Blue line), but could not find any register in the TPS to configure it.

It looks like its mainly used for Silicon level testing.

Does any one have any documentation regarding this.

What I am basically trying to do is, Loop the I2S (RX) interface with the PCM (TX). For the purpose I require the Digital voice loop to complete the path. Has anyone tried this before ??

The phase wave of TPS65930 not stable

John Huang — Fri, 23 Oct 2009 10:55:12 GMT

My name is John, power engineer. The TPS65930 was used in our project and it's electronic characters of PWM circuit look fine except the phase wave of VIO.SW. The attached file is the phase wave of TPS65930 (VDD1SW, VDD2.SW, and VIO.SW). These phase waves of VDD1.SW and VDD2.SW look good, but the phase of VIO.SW looks not stable. Could you please help me to improve the phase wave of VIO.SW? Thanks a lot. Note: Input voltage of TPS65930 is 3.6V.

TPS65920 VDD1 overvoltage?

Wade VonBergen — Tue, 22 Sep 2009 20:10:45 GMT

I have customer with multiple TPS65920's. One of them is outputting 1.8v on VDD1.

I searched forums, and did not find any other case of this. Any ideas on potential cause?

Thanks,

Wade