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TPS2561: tps2561 using just one channel

March 25, 2018, 11:47 pm
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Part Number:TPS2561

Here is a question on TPS2561

since TPS2561 is a dual channel, can just one channel be used, for example, EN1 is used to control channel 1 and EN2 is pulled down to GND. Then OUT2 is floating and Vin is connected together just for channel 1? 

Thanks .

BRs

Given

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BQ76PL455A-Q1: BQ76PL455A-Q1

March 25, 2018, 11:51 pm
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Part Number:BQ76PL455A-Q1

Hello,

What is the R and C values of components present inside the SAR ADC? In the datasheet the R and C values of ADC from AUX pins is given, do these values hold good for the Vsense pins as well?

Provide more information on the ADC's settling time, acquisition time and the equations involved so as to calculate the external RC values so as to obtain high ADC accuracy.

Thank you

Sushma Mantagani

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LMP8640HV: LMP8640HV ALTERNATIVE BI-DIRECTIONAL CURRENT SENSING AMPLIFIER

March 25, 2018, 11:51 pm
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Part Number:LMP8640HV

Dear all,

I need a bi-directional current sensing amplifier pin compatible with LMP8640HV. Anyone help me please.

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TAS5754M: how to program TAS5754/56

March 25, 2018, 11:54 pm
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Part Number:TAS5754M

hi all,

Is there a way how to program the TAS5754/56 amplifier without the PurePath Console Mother Board?

I.e. exporting binary blob from GUI and loading it with usb to i2c bridge?

thanks a lot in advance

KR

Vincenzo

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HDC1080: How to identify if it is condensation situation or humidity reduce situation ?

March 26, 2018, 12:03 am
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Part Number:HDC1080

Hi 

Condensation and  humidity reduce, in both case the HDC1080 reading will decrease. How to differentiate these two cases? 

Thanks!

PY Tsai

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TMS320F280045: External pullup at TMS pin using XDS110 with cJTAG mode

March 26, 2018, 12:11 am
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Part Number:TMS320F280045

Customer was facing connection problems using XDS110 USB interface in cJTAG mode while working fine in normal JTAG( 4 wire) mode.
Finally he found out that the pullups (2k2 resp.4K7) at TMS pin were to low recommended in the datasheet :

Now he is just having the C2000 internal pullup for software debugging but feels uncomfortable to use this configuration for his final production design.
What is for cJTAG mode the optimal ext. pullup value for TMS pin to have reliable signal stability?
Is this an XDS110 issue and changes when moving e.g. to XDS200?

Regards, Bernd

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OPA857: Lidar

March 26, 2018, 12:12 am
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Part Number:OPA857

Hi Sir 

I saw TI design is using OPA857 + THS4541 or TLV3502 to do the receiver function of Lidar 

May I know TI have 2 in 1 solution ? (one component have OPA857 + op or THS)

Thanks 

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TMS320F28075: 32 bit access vs 16 bit access to the CAN registers

March 26, 2018, 12:14 am
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Part Number:TMS320F28075

Hi all

In the reference manual of the controller you state in section 21.14 "Message Interface Register Sets":

NOTE: Only 32-bit accesses to the CAN registers are allowed, as 16-bit accesses may not work as
expected.

However in the TI examples only 16 bit accesses are used.

What is correct?

Cheers Benjo

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OPA1642-Q1: audio signal protection

March 26, 2018, 12:15 am
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Part Number:OPA1642-Q1

Hi team,

There is an analog mic in and with 2 meters cable to the OPA1642.

Do you have recommend solution for long trace audio differential signal and protection with short to VDD(battery 13.6V) and short to GND?

There is no specific microphone spec currently.

Thank you!

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cc2541: GATT_Notification handling in gatt client

March 26, 2018, 12:16 am
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Part Number:cc2541

hi,

I'm using SimplebleCentral project running in cc2541 keyfob(central) and i have HidKbdEmu project in another custom keypad (peripheral). i have to send notifications from peripheral to central device when key is pressed or released. i have code for sending notifications. But i dont know how this notification is handled in the central device(gatt client).

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DRV8412: DVDD and VDD power supply current

March 26, 2018, 12:17 am
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Part Number:DRV8412

Hello,

In the datasheet, there is a condition which is GVDD = VDD = 12 V, fSw = 400 kHz and IVDD=10.5(typ) and IGVDD_x = 8mA/half_bridge.

I think 12V power supply current will be 42.5mA(typ). Is my understanding correct.

when switching frequency is 500kHz, IGVDD_x will be increased. Is it roughly ok that 500k/400k x 8mA = 10mA/half-bridge?

Best regards,

Toshihiro Watanabe

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SN74AVC1T45: About Tj MAX for SN74AVC1T45DCKR/SN74LVC1G07DCKR

March 26, 2018, 12:19 am
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Part Number:SN74AVC1T45

Hi dear supporting team,

What's the max junction temp (Tj)  for SN74AVC1T45DCKR / SN74LVC1G07DCKR? 

Thanks.

BR, Gary

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TPA3255: Dual TPA3255 used in parallel with PBTL Mode

March 26, 2018, 12:20 am
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Part Number:TPA3255

Hi, 

Is TPA3255 allowed to use in parallel with PBTL Mode in order to get more transmit power (Use 2pcs TPA3255 in parallel to get 1000W power) ?

and why can't  efficiency of TPA3255 achieve 96%? 

Thanks a lot.

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LAUNCHXL-CC13-90: CC1310 + CC1190 Reference Design poor performance

March 26, 2018, 12:27 am
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Part Number:LAUNCHXL-CC13-90

We have been testing with a pair of LAUNCHXL-CC13-90US and a pair of LAUNCHXL-CC1310 development boards from TI.

We tested using the rfPacketErrorRate app supplied in the flash of each dev board. At a variety of ranges from <1m to approx 500m, we found that the CC1310-only LAUNCHXL-CC1310 boards consistently outperformed the CC1310+CC1190 boards. We were expecting the CC1190 to give us a RSSI improvement of 20-24 dDm, not a reduction, or at best no significant increase. 

We tested using

  • 2-GFSK
  • 915.0 MHz
  • CC1190 Enabled (for the CC13-90) 

(By the way, our own boards based on the LAUNCHXL-CC13-90US reference design showed similar performance to the official dev boards.)

Have others experienced similar disappointing results from this combo? What could  we be doing wrong?

Possible factor...

As part of our investigation we did a lot of testing driving the boards using SmartRF Studio 7, including transmission at 14dBm until we found discussion suggesting the CC1190 could be damaged by input above 5 or 6 dBm. Is it possible we progressively and inadvertently damaged all our CC1190 devices in this way? The output on our VNA is remarkably similar for all the different devices, so we don't think this is the case.

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TM4C1290NCPDT: Application Help

March 26, 2018, 12:29 am
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TPS61099: DCDC buck boost chip recommend, such as TPS61099

March 26, 2018, 12:29 am
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Part Number:TPS61099

Hello,

1) my project application, NB_IOT gas meter

2) the power rail: DC6V output from dry battery, the through LDO output 5V , throurh DCDC output 3.6V power for NB module.

3) another power rail: DC3.6V from LI-battery, through DCDC output 3.6V power for NB module. The battery voltage will drop, so it needs to be boosted.

please help me to check the TPS61099 can meet the request?

they need meet the boost and buck at the same PCB.

thanks.

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LMG5200EVM-02: LMG5200EVM-02 GaN Half-Bridge Power Stage EVM in 5Mhz

March 26, 2018, 12:30 am
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Part Number:LMG5200EVM-02

Dear Master,

I use LMG5200EVM-02 to verify 5Mhz but waveform become very strange and efficiency down to 84%(original all over 92%).

Dut to I need to verify differently inductor,the test circuit will become like that.

5MHz waveform 

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IWR1642: Building IWR1642 custom board

March 26, 2018, 12:35 am
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Part Number:IWR1642

Hello,

I am now trying to build a custom board using IWR1642.

Our design is almost the same with the IWR1642Boost except some GPIOs

Flashing the chip will be done through uart over USB or RS232 selective with a 0 ohm resistor.

For uart over USB, TI design uses TM4C1294NCPDTT3. Here is my question.

Do I need to program the TM4C before applying the board?

Or I just mount the part and plug it in USB port of PC, then PC automatically recognize the device? 

Please let me know it.

THANKS.

Regards

S. BAE

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CC2538: what is reflexive jamming ?

March 26, 2018, 12:38 am
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Part Number:CC2538

Hello,

anyone help me to understand what is "reflexive jamming" ?

And how it is different from channel/frequency jamming ?

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BQ78350-R1: Confirm the document, Full Charge Capacity

March 26, 2018, 12:40 am
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Part Number:BQ78350-R1

I am currently reading technical reference (sluubd3c.pdf) of bq78350-r1.
I have a question about the following sentences of 9.1.5.

 

The initial FCC is a direct copy of Full Charge Capacity.

 

I searched for this document but I could not find a data flash value called 'Full Charge Capacity'. In my guess, Full Charge Capacity is the following value.

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