/etc... RF (Read-Only) Forum - Recent Threads

1

jun GAO — Wed, 10 Feb 2016 17:05:09 GMT

LMV232 Input pin ABSOLUTE MAXIMUM RATINGS?

Masazumi Ishii — Wed, 21 Oct 2015 10:45:42 GMT

Other Parts Discussed in Thread: LMV232

Hello.

I have a question about LM232.

Input pin　RFIN1　and　RFIN2

Please inform me about Input Voltage　ABSOLUTE MAXIMUM RATINGS？

Thank you..

UPDATE: This Forum will be Read-Only starting this Wednesday

Blake TI Community — Mon, 13 Jul 2015 19:39:57 GMT

Please note that starting this Wednesday, July 15th, the etc RF Forum will become "Read-Only." Any Forum threads still active then can be moved to the most applicable Forum.

For posting new questions at this time it's recommended to search for existing solutions at any of our current Wireless Connectivity Forums. In addition you can post a question there if you can't find what you are looking for. A Forum sitemap for all Wireless Connectivity Forums can be found here.

In this transition, you can send me a friends request or PM (private message) for any further assistance.

TRF7970A Host Card Emulation

M.H — Fri, 10 Jul 2015 06:34:19 GMT

Other Parts Discussed in Thread: TRF7970A

Hi,

TRF7970A do is compatible with Android 4.4 Host Card Emulation (HCE)?

Best Regards,

How much to amplify RF signals before ADC?

Juan Abelaira — Wed, 08 Jul 2015 09:26:55 GMT

I'm working on a front-end for an SDR radio receiver. Most ADCs have input ranges in the order of volts, while the antenna signal can be as low as a fraction of a uV. I wonder if it's the way to go to amplify these signals by 120 dB (!?) without creating other problems in the circuit. Or is it that only voltage is amplified by not power (or not that much)?

Regards

CC2541 - Want to achieve 128KBPS data trasnfer - Is it possible ?

vignesh waran — Mon, 06 Jul 2015 08:37:46 GMT

Other Parts Discussed in Thread: CC2541

Hi,

We would like to use CC2541 device in our application, where data transfer from the Bluetooth device ?(CC2541) to the Android Mobile must be 128KBPS. Atleast, it must be 64KBPS. Is it possible to achieve the same ?.

Can anyone suggest me which mode / protocol to go ahead for this ?.

Regards,

Vignesh

CC1120 Frequencies

Louis Pahlavi — Sat, 04 Jul 2015 20:18:16 GMT

Other Parts Discussed in Thread: CC1120

Hi,

I am planning on using the CC1120 transceiver on a nano-satellite on amateur bands. We have a UHF and a VHF frequency.

My issue is that because of frequency allocation, we are restricted to using either 135MHz or 148MHz for VHF. On the CC1120 datasheet, it says it is capable to operate at those frequencies yet it is not listed in detail.

Does anyone have any idea how to use those frequencies with the CC1120?

Thanks!

Louis

SmartRF Flash Programmer v2 1.6.2 archive broken ?

Vinch — Sat, 04 Jul 2015 15:30:13 GMT

After dowloading the zip archive, my unzip tool tells me the archive is broken. Am I alone ?

bill of materials file for trf37a75

aditya bhandari — Fri, 03 Jul 2015 13:12:38 GMT

Other Parts Discussed in Thread: TRF37A75

I intend to use trf37a75 as an amplifier and make a pcb for the same. Can someone please provide me the bill of materials file for the same amplifier schematic as given in the data sheet. Also is the schematic to be followed same as that given in the datasheet?

Regarding pcb model for trf37a75

aditya bhandari — Tue, 30 Jun 2015 13:59:41 GMT

Other Parts Discussed in Thread: TRF37A75

I am using a trf37a75 power amplifier module as amplifier in my RF repeater project. I have the IC with me, I saw the associated circuitry required in the datasheet to make it work as an amplifier. I want to design a PCB for the same so what tools should i use to make the PCB design? If not possible domestically, what should i tell the vendor who makes the PCB as he too shall be new to such stuff

Custom built cc2541 BLE peripheral device cannot be found by Smartphone but can be found by CC2540 USB Dongle

Quan Dong — Mon, 29 Jun 2015 18:06:21 GMT

Other Parts Discussed in Thread: CC2541, CC2540

I built a cc2541 peripheral device (the schematic is attached) running original SimpleBLEPeripheral example code. The device can be detected by either BTool or BLE device monitor through CC2540 USB Dongle on a laptop, and the signal is very good. The RSSI reading can be -40. However, it was not shown on smartphones, iPhone 5 using BLE Utility app or Samsung Galaxy S3 using Bluetooth LE Scanner app. Does anyone know any hardware or software reasons for this? Thank a lot in advance!

CC1200 ASK mode for PPM demodulation?

Victhor Foster — Fri, 26 Jun 2015 06:17:54 GMT

Other Parts Discussed in Thread: CC1200

Is it feasible to use the ASK demodulator on the CC1200 for PPM (pulse position modulation) decoding? Packet decoding on CC1200 not necessary, this can be done by the host MCU, basically the CC1200 would only detect the carrier pulses as ASK and the MCU would measure the interval between each received pulse to correctly decode them as bits.

Error in loading external files in "High speed data converter pro v3.0"

Shubham Karnani — Tue, 16 Jun 2015 07:48:15 GMT

I am testing the TSW30sh84 evm with TSW1400 evm, while running the through the GUI software "High Speed Data Converter Pro v3.0" following error was occur as described through the attached image. So kindly reply me with the solution for the problem.

Distortion with CC8520 and CC2590

Maxime Reaux — Thu, 11 Jun 2015 14:35:16 GMT

Other Parts Discussed in Thread: CC8520, TLV320AIC3254, CC2590

Hi there,

I am working on an embedded audio emitter/receiver, based on the TLV320AIC3254 codec, the CC8520 audio streamer and CC2590 front end.

It functionnaly works well, eihter as a simple a recorder, or an emitter or a receiver. However, I noticed an annoying noise when transmition is ON.

It is not a random noise, it has big regular harmonics : 125Hz, 250Hz, 500Hz, 750Hz... Even worse in emitter mode, these harmonics are stronger and 3 sub-harmonics appear between each of them, making it sound horrible. It could have been kind of interference within my layout, although none of my ICs are runnnig at this frequency ! Therefore I assume it comes from internal artifact...

Does anyone experienced such an intermodulation distortion with these ICs ? Is there a way to avoid it ?

Cheers !

900 mhz Laundry Tags...

vincent youmans — Wed, 10 Jun 2015 20:02:15 GMT

Other Parts Discussed in Thread: RF-HDT-DVBE, RF-HDT-DVBB

I was looking to build a system using 900 Mhx laundry tags. Kind of a learning experience. I'd also want to use a TI MSP 430 or 432. And I want to get an antenna, and read a bag of tags. So, can I do this with TI parts, and which parts should I be looking at?

any other comments, sources, links, I would also appreciate.

thanks

smartrf05bb slightly high current consumption

kazola — Wed, 10 Jun 2015 17:39:44 GMT

Hi,

I'm attaching a cc2541em to a battery-powered smartrf05bb.

There is no jumper on the board present. EM selection switch is in SOC/TRX position.

I attach my Ammeter to P7 and switch on the board.

However, in sleep mode I do not obtain 1 uA. In fact, I see 0.2mA.

Instead, if moving EM selection switch to MSP position, I obtain 0.08mA. Just being curious why this happens. Datasheet says it should by SOC/TRX.

By removing the cc2451em from the battery board and powering in other manners, I obtain the desired value in the Ammeter.

My goal is obviously to see my 1uA while the node is powered by smartRF05BB! :)

So, I'm omitting something, please let me know your thoughts!

Impedance Matching on RF board(CC2541- BLE)

Kumar Karan Jain — Tue, 09 Jun 2015 15:15:57 GMT

Other Parts Discussed in Thread: CC2541

Hello,

We are developing RF PCB based on CC2541. We refers to tidrc156a.zip, it is dual layer postage stamp reference design guide included gerber data and drill data.

Here transmission line width is 0.3mm(Dielectric - FR4 0.8mm copper thickness 35um each layer).

For our PCB we are confused which calculator to be used to calculate transmission line width either microstrip or CPW(Co-planar wave).

Microstrip Impedance calculator reflects width of 1.41mm and

CPW calculator reflects width of 1mm.

Still these is much differencein transmission line width between the reference(tidc156a.zip) and calculator value whether it may be microstrip or CPW.

Our board specifications are:-

Dielectric width 0.8mm, copper thickness 35um, Dielectric coefficient 4.6 and operating frequency 2400MHz.

Please guide us which calculator to be used and how to calculate the transmission line width to match impedance correctly.

Designing CC2540 and CC2592

Devansh Shah — Fri, 05 Jun 2015 21:20:22 GMT

Hello,

I am designing a bluetooth module for one of our application using CC2540 and CC2592.

I have refer couple of design before starting this design.

1. CC2541-CC2590

2. CC2538-CC2592

So I am actually interested in finding out what's the minimum distance that is required between CC2540 and CC2592. I have approximately found out 5.25MM-5.5MM distance between CC2541 and CC2541.

So can anybody please tell me exactly what''s the min. distance for my design between these two (CC2540 - CC2592) ??

Thank you in advance.

The swrc250a.zip file I downloaded with CC4000_MSP430_UE_Codev1.14_setup.exe fails when I try to run it.

Lee Larson92 — Wed, 03 Jun 2015 21:01:14 GMT

Install anywhere dialog box pops up with a fatal application error about some java application

In details, it has:

ZeroGu3: Windows DLL failed to load
at ZeroGa2.b(DashoA10*..)
at ZeroGa2.b(DashoA10*..)
at com.zerog.ia.installer.LifeCycleManager.b(DashoA10*..)
at com.zerog.ia.installer.LifeCycleManager.a(DashoA10*..)
at com.zerog.ia.installer.Main.main(DashoA10*..)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.zerog.lax.LAX.launch(DashoA10*..)
at com.zerog.lax.LAX.main(DashoA10*..)

ANy idea how to get the code to extract/setup?

Chip for CC2592 Antenna???

Devansh Shah — Fri, 29 May 2015 23:48:09 GMT

Other Parts Discussed in Thread: CC2540, CC2592

Hello,

I am designing a bluetooth module with CC2540 and CC2592.

The question that I have is regarding CC2592 Antenna. The ANT (pin10) of CC2592 has specific circuit but can we use a single chip antenna instead of those 6-7 components?

We are concerned about the size that's the reason I am asking question but we don't want any impact on performance.So can somebody please give me answer on this if we can replace this 6-7 components with single component??

Thanks in advance.

Devansh Shah

Distance between CC2540 and CC2592

Devansh Shah — Fri, 29 May 2015 22:48:00 GMT

Other Parts Discussed in Thread: CC2540, CC2592, CC2541

Hello,

I am designing a bluetooth module for one of our application using CC2540 and CC2592.

I have refer couple of design before starting this design.

1. CC2541-CC2590

2. CC2538-CC2592

So I am actually interested in finding out what's the minimum distance that is required between CC2540 and CC2592. I have approximately found out 5.25MM-5.5MM distance between CC2541 and CC2541.

So can anybody please tell me exactly what''s the min. distance for my design between these two (CC2540 - CC2592) ??

Thank you in advance.

Devansh

TI2540 using usbfwReadFifo

Sebastian van Wickern — Fri, 29 May 2015 15:26:29 GMT

Hello everyone,

in the last couple of days I have tried my luck reading USB-Input from my computer using the TI2540. This far, I have successfully read input (see the output), but USBCNT0 is always zero.

using:

uint8 * tmpData = osal_mem_alloc(*len);
uint8 ea = halIntLock();
uint8 bytesNow = 10;//USBCNT0;
*len = bytesNow;
USBFW_SELECT_ENDPOINT(endPoint);
usbfwReadFifo(((&USBF0) + (endPoint << 1)), bytesNow, tmpData);
USBFW_ARM_OUT_ENDPOINT();

a few times, gives the following output:

USBCNT0: 0USB_Buffer_0:1
81 7f 2 0 0 1 0 7f 70

USBCNT0: 0USB_Buffer_0:25
7f 75 8 95 3 81 6 c0 c0

USBCNT0: 0USB_Buffer_0:75
1 95 3 81 2 75 5 95 1

USBCNT0: 0USB_Buffer_0:81
1 1 81 7f 2 0 0 1 0

USBCNT0: 0USB_Buffer_0:7f
70 25 7f 75 8 95 3 81 6

USBCNT0: 0USB_Buffer_0:c0
c0 75 1 95 3 81 2 75 5

Basically I'm just trying to extend usbHidProcessEvents defined in usb_hid to read from the USB Port.

Is there a example how to read form the usb port using the 2540 Dongle?

Designing Bluetooth Module with range extender

Devansh Shah — Wed, 27 May 2015 17:34:26 GMT

Hello,

We are trying to make bluetooth module for one of our application using CC2540 and CC2592.

I have got reference from CC2592 datasheet and reference design for CC2538+CC2592. The other reference that I got is from CC2540 and CC2540+CC2591 reference design. I am going to follow the stackup and 4layers as per reference design.

We have some questions regarding this design :

1. HGM pin in one of the reference design is connected either to pull down or pull up and the other reference design it is directly connected to CC25xx.

2. The best way to connect CC2540 and CC2592 on RF_P and RF_N is directly connect to each other but we want maximum range with high power for our application so can you please let us know if we can directly connect these pins on CC2540 and CC2592.

[ I am asking this question because we earlier design CC2500 + CC2591 and we added balun network in between this and we got better response. I couldn't find any reference design with CC2540 and CC2592 having connected with balun network so that's the reason I am asking this)

3. Can you suggest best possible configuration for hooking up CC2540 + CC2592. (I could send my reference design if you want)

4. And if you can also suggest best reference design to refer for making this schematic design and layout considerations.

Please can you give the answer point by point will be really helpful.

Please can you let us know as soon as you can it will be really appreciated since we are trying to move quickly on this.

Regards..!!

Best transceiver IC for walky talky applications?

Tony James — Wed, 27 May 2015 05:21:02 GMT

Hello all,

Does anyone have any suggestions on transceiver ICs for walky talky applications? Thanks!

CC2540 + CC2592

Devansh Shah — Tue, 26 May 2015 14:59:30 GMT

Other Parts Discussed in Thread: CC2540, CC2592, CC2591, CC2538, CC2500, CC2541, CC2590, CC2530

Hello,

We are trying to make bluetooth module for one of our application using CC2540 and CC2592.

We have some questions regarding this design :

1. HGM pin in one of the reference design is connected either to pull down or pull up and the other reference design it is directly connected to CC25xx.

3. Can you suggest best possible configuration for hooking up CC2540 + CC2592. (I could send my reference design if you want)

4. And if you can also suggest best reference design to refer for making this schematic design and layout considerations.

Please can you give the answer point by point will be really helpful.

Please can you let us know as soon as you can it will be really appreciated since we are trying to move quickly on this.

Regards,

Devansh