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CC2640R2F: How to implement BLE pairing behavior with central device like this smoothly?

April 16, 2019, 5:29 am
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Part Number:CC2640R2F

Hi all,

Customer wants to use CC2640R2F to pair with a central device by following rule:
(1) The first time, DUT (with CC2640) can be discoverable by a central device , but central device is unable to connect the DUT.
      Till DUT's HW button is pressed, a central device can pair (then bonded) & establish BLE connection with that DUT.
(2) Minutes later, the central device disconnects from the DUT for some reason.
      The DUT becomes scannable but cannot be connectable by other central device unless user presses the button.
      A minute later, the central device can re-connect to DUT.

What is the Advertising type needed to set by DUT for each changing status and what action is needed for the central device?

Sincerely,
Jinhua
 

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TPS2553-1: Minimum output capacitance

April 16, 2019, 5:30 am
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Part Number:TPS2553-1

Dear Sir,

As datasheet 11.2 show. Can use 10uF for  TPS2553 output capacitance? If can't, how many minimum output capacitance for TPS2553?

Best Regards,

Sam

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MSP432P401R: Custom Board unable to flash when connected to the debugger

April 16, 2019, 5:31 am
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Part Number:MSP432P401R

Hello, it is my first time developing a custom board for a micro-controller and I may have made a few errors considering I am currently unable to flash my device when I connect to the debugger available on the msp432 launchpad. For reference the exact error I am getting is "CORTEX_M4_0: Flash Programmer: Verify error. Writing to Flash failed!". I want to preface that when making this board I was confused a bit on the component requirements of DVCC, AVCC, DCORE, and VCORE.  My application does not require an external oscillator nor does it require any DAC/ADC functionality. I mainly just need access to gpios for SPI and I2C protocol connections. Any advice or tips would be greatly appreciated as if i can somehow make this board work without ordering a new custom one that would save me a ton of wasted time (in other words: i'm not afraid to try and cut traces or swap components if I can)!

(Please visit the site to view this file)

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BQ78350-R1: BQ78350-R1 + MSP430

April 16, 2019, 5:34 am
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Part Number:BQ78350-R1

HI Sir 

Below is our system block diagram will use BQ78350 + MSP430

Does TI have MSP430 reference code ? and used with BQ78350

Thanks

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TPS65988: Provide its certificate No. such as UL and IEC

April 16, 2019, 5:34 am
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Part Number:TPS65988

Hi team,

We checked the web site for TPS65988.

The device is USB PD 3.0-certified, UL Recognized, and International Electrotechnical Commission (IEC) safety-certified, and come preprogrammed to support several of the most common use cases including DisplayPort™ and Thunderbolt™ applications. 

Would you please can you provide its certificate No. such as ULxxx and IECxxx? Thanks.

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TCAN1043-Q1: CAN BUS Failures, Detection & Flag Clearance

April 16, 2019, 5:37 am
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Part Number:TCAN1043-Q1

Hello,

I have two topics regarding CAN bus failure detection.

1) Is TCAN1043 able to detect a short between CANH and CANL ? Measurements and datasheet seem to show that nFault-pin does not signal the short state. How is such a failure handled / detected by the system ?

2) In event of nFault going low because of CANL/H short to GND / VSUP, how is it cleared after removal of short ? It is not cleared automatically. What is the procedure the host MCU must perform ?

Thank you

Martin

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BQ40Z60: SOC & SOH & Coulomb Counting

April 16, 2019, 5:44 am
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Part Number:BQ40Z60

hello ,

one of my customer is considering BQ40Z60 . 

can you help me or direct me on how to derive  :

  1. Algorithm SOC & SOH.
  2.  Coulomb Counting Merits & De-Merits.
  3. Bq40Z60 How to read SOC and SOH 

Thanks 

Mandar

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BQ24650: Setting V_refcharge for LiFePO4 Battery

April 16, 2019, 5:50 am
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Part Number:BQ24650

Hello,

I need to build a solar charger for a LiFePO4 battery.

The requirements are to support 4,5,6 and 7 cells batteries.

Consulting the app note SLUA565 (Using the bq24650 to Charge LiFePO4 Battery), it is explained how to add a resistor in parallel to R23 (R15 in the app note) to reduce V_refcharge to 3.4V for example, however this app note address only 1 cell battery.

In order to support 4 to 7 cells, I need to do the following:

1. Change R22 (R13 in the app note)  for each battery type assuming R23 (R15 in the app note) is constant.
So in my design, if R23 is 100K than for 5 cell R22 will be 757K and for 6 cells 928K and so on right?

2. Set the parallel resistor accordingly, 3M ohm looks like the correct value.

3. MOSFET - in this solution the gate of the MOSFET is connected to STAT2. Vsys in my design can be 28V so it will burn the gate. I see no reference to that in the app note. Will a zener diode make sense or am I missing something here?

Thanks,

Tomer

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ADS1298: ADS1298 input impedance

April 16, 2019, 5:50 am
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Part Number:ADS1298

Respected TI expert:

Is the input impedance of ADS1298 adjustable?What is the input impedance if the lead does not come off?thanks a lot

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TMS320DM8127: IPNC_RDK_V3.8.0-Linux-x86-Install.bin

April 16, 2019, 5:51 am
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Part Number:TMS320DM8127

Hi,

I'm working with the platform DM8127 IPNC.  In order to adapt to my existing environment and procedures, I need the package IPNC_RDK_V3.8.0-Linux-x86-Install.bin.

But on TI website I can only find the version IPNC-RDK-CSK-3.9.1-Linux-x86-Install.bin.

Where and how can I get the previous version of the resource (IPNC_RDK_V3.8.0-Linux-x86-Install.bin)?

Thanks in anticipation of your support.

Regards,

Kunyu

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SMV320C6727B-SP: TMS320c672x DSP Dual Data Movement Accelerator (dMAX)

April 16, 2019, 5:52 am
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Part Number:SMV320C6727B-SP

I am currently getting familiar with the TMS320C672x DSP Dual Data Movement Accelerator (dMAX) and how to service the McASP. The Reference Guide (spru795d_dMAX.pdf) has a single example for the McASP interface but because there are numerous ways to move data, it doesn't explain how to configure my particular interest.  Is there technical staff available at TI that have in-depth knowledge of the transfer possibilities for the McASP peripheral?  If so, I could follow-up with my particular example parameters and needs.

Thank you much,

Michael Gottfried/Harris Corporation

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DRV5055: Quiescent voltage and sensitivity with different Vcc

April 16, 2019, 5:52 am
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Part Number:DRV5055

Hi Team,

3.3V power supply is used for DRV5055A3, but sometimes the power supply may not be stable and changes a little bit high or low. Could you please help confirm:

1. Will the quiescent voltage always be Vcc/2? Which means if the Vcc is 3.4V, the quiescent voltage is 1.7V?

2. Will the sensitivity change linearly if Vcc changes?

Thanks and Best Regards!

Hao

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BQ34110: Help in Configuring Basic Gauge Parameters

April 16, 2019, 5:54 am
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Part Number:BQ34110

Hi Team TI,

I'm working with a BQ34110 to monitor a 6000mAh 12.8v LiFePO4 battery pack.  The pack contains 4 cells in total and They are configured as 4 series cells.  I am using bqstudio and EV2400 to communicate.

The problem we are having in configuring the gauge to correctly monitor the remaining capacity and the Relative State of Charge(SOC).  I have set up the Voltage Divider parameter, calibrated the voltage and current, and I am getting accurate readings for both Current and Voltage from the battery pack.

Q1.  In bqstudio Design Capacity and Full Charge capacity is set to Default Value of 2200mAH. I need to change that to 6000mAH. Please suggest me how to configure these parameters.?

Q2. Also, Suggest me which are the other parameters I need to configure to get the accurate SOC.

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IWR1443BOOST: IWR1143 Wireless communication

April 16, 2019, 5:58 am
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Part Number:IWR1443BOOST

Hello,

I bought an IWR1443BOOST board and I would like to make a tank level application for measuring solids. I would like to send level information wirelessly (Using CC1312 for example) and be able to change parameters from a pc/web/phone application. My questions are the following:

1. Is it possible to process the data directly from IWR1443BOOST firmware to get the real level and send it to the wireless module throught SPI/UART/I2C

2. Is there any example I could use to start my project?

Thank you in advance,

Jorge

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TPS22976: Ron specification

April 16, 2019, 6:00 am
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Part Number:TPS22976

TPS22976 support team

The below is the On-state resistance of TPS22976.

I have three request of Ron specification as follows.

  1. What is MIN / TYP value of Ron when Vin=5V and 3.3V?
  2. How unbalanced is Ron between channels?
  3. Can you provide me with PSpise model that Rds between channels is configured the maximum unbalanced to simulate using TINA-TI or Allegro?

Regards,

Tamio  

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TINA/Spice/LM3671-Q1: PSpice model

April 16, 2019, 6:05 am
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Part Number:LM3671-Q1

Tool/software:TINA-TI or Spice Models

Hi,

It seems that the Pspice model available on the site is not operational. It is not recognized by Orcad.

Regards,

Jean-Marc

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DS90UB954-Q1: refclk check

April 16, 2019, 6:16 am
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Part Number:DS90UB954-Q1

Hi TI,

   We are using DS90UB954-Q1 , we want to using system clock as  refclk,could you check attachment can match 954 criteria of refclk？

thanks

peiyuanqing(Please visit the site to view this video)

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TPS61193-Q1: Audible Noise from Inductor

April 16, 2019, 6:20 am
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Part Number:TPS61193-Q1

Hi 

We are using TPS61193 part in one of design for Gauge illumination and TFT backlight section.

Hearing Audible noise in below ranges: 

Gauge illumination inductor from VIN - 13.2V to 13.6V (Non-Shielded type inductor)

TFT illumination backlight inductor from VIN - 16.5V to 16.8V,  (Using Shielded type Inductor)

Design operating range is Vin = 6V to 18V. 

Findings:

1. Below is schematic image, used 1 x 47uF(electrolyte Cap) & 2 x 10uF(Ceramic Cap) and I changed the ceramic cap (C911 & C912) to 22uF and still hear audible noise. 

2. I removed the  2x10uF(Ceramic cap) and audible noise is completely reduced, But TPS61193-Q1 datasheet recommend to use Ceramic cap in Note A and whereas in Note B recommend to use physical size ceramic cap should be minimized. 

Query: 

1. What will impact if i remove the ceramic cap ?. Since product in final stage and not in place to change the inductor to shielded type from Non-shielded type

2. Without removing capacitor, what would be TI recommendation to isolate the audible noise. 

 

Note A:

Note B:

Thanks and Regards

Balakrishnan

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Linux/DRA745: Please help to explain of uEnv.txt parameter's meaning

April 16, 2019, 6:22 am
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Part Number:DRA745

Tool/software: Linux

Hi,experts,

I do not understand the parameter's Meaning of uEnv.txt.Could you please explain this ? 

 elevator=noop

rootwait

earlyprintk

fixrtc omapdrm.num_crtc=2

consoleblank=0

cma=128M@0xB0000000

rootfstype=ext4

Best Regards.

Widic

snd.slots_reserved=1,1

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LAUNCHXL-CC1352R1: Zigbee

April 16, 2019, 6:25 am
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Part Number:LAUNCHXL-CC1352R1

Hello,

I am using CC1352R REV E boards with SDK 3.10.00.11.

1) I started with the basic examples of ZigBee. I uploaded one board with Zc_doorlock_Controller and another with Zc_doorlock. But I noticed a difference in the way they used to interact in SDK 2.3 and in SDK 3.10.
In the newer version, the doorlock controller is not able to control the doorlock from its terminal. Pressing ‘W’ and ‘S’ won’t show unlock or lock the doorlock terminal and neither on its terminal. It reflects a state on its own terminal but it is always the locked state.

May I know the reason why it is behaving in such a way?

2) I have a doubt regarding the 2nd DMM example provided in ZigBee (dmm_zr_light_remote_display_app). I went through the Readme file of that particular example but I couldn’t understand the Projects used. It has asked to use a ZigBee Light Coordinator (which, if I am not wrong is Zc_Light) in conjunction with dmm_zr_light_remote_display_app. And it has no mention of any other example to be used. So how are 2 Light examples supposed to communicate with each other?

Is it that, this example is an extension/continuation of the previous example (dmm_zed_switch_remote_display_app) or is it a standalone example?

If it is the later can you please suggest me where I am going wrong with the setup?

 

Also, found this line (in the screenshot below) which confused me even more, Do end devices have routing capabilities?  

Can anyone help me in knowing where I am going wrong with this?

Thanks and Regards,

Yash.

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