Other wireless technologies forum - Recent Threads

RI-STU-MRD2: Availability or Replacement for Legacy RFID Reader RI-STU-251B

lucas ebbo — Tue, 21 Jul 2026 09:22:39 GMT

Part Number: RI-STU-MRD2

Hello,

We are currently using a Texas Instruments RFID reader in our production equipment and need to purchase a replacement unit.

Product details:

- Series 2000 Reader System

- Reader S251B

- Part Number: RI-STU-251B

- Internal module references visible on the hardware:

- RI-STU-251B-30

- RI-RFMI-0078-30

The product appears to be obsolete and is no longer listed in the TI support portal.

Could you please advise:

1. Whether this reader or any compatible spare units are still available for purchase.

2. If not, what is the current Texas Instruments equivalent or recommended replacement.

3. Whether the recommended replacement is compatible with existing Series 2000 RFID transponders and installation.

Photos of the equipment are attached for reference.

Thank you for your assistance.

Best regards,

Lucas EBBO

Rousset SAS

France

CC2652R: Guidance Required for Passive Keyless Entry Key Fob Development

Ramkumar Ramasamy — Tue, 21 Jul 2026 01:59:38 GMT

Part Number: CC2652R
Other Parts Discussed in Thread: CC2745R10-Q1, UNIFLASH

Hi Team,

Good day..!

I am planning to develop a proof-of-concept Passive Keyless Entry (PKE) system and would appreciate your guidance in selecting the appropriate solution and understanding the overall system architecture.

Specifically, I would like to understand the following:
1. How does a Passive Keyless Entry (PKE) system work from key detection to authentication and unlocking?
2. Could you provide design guidelines for the antennas, including recommended PCB layout practices, matching networks, tuning methods, and reference antenna designs?
3. Is an external MCU required, or are there integrated solutions that include both the MCU and RF functionality?
4. What are the essential hardware components required on:
* the key fob (transmitter)
* the vehicle side (receiver/base station)
5. Which communication technologies are typically used?
6. What factors primarily influence the operating distance (antenna design, transmit power, receiver sensitivity, matching, enclosure, battery voltage, environmental conditions, etc.)?
7. Could you recommend suitable low-cost ICs for both the key fob and vehicle side, along with their datasheets, application notes, evaluation boards, and reference designs?
8. Are there complete reference designs, firmware examples, or software development kits (SDKs) available to accelerate development?
My goal is to understand the complete hardware architecture and select the appropriate components before beginning the design.
I would appreciate any recommended documentation, application notes, reference designs, or evaluation kits that would help me get started.
Thank you for your support.
Best regards,
Ram

TRF7970A: Linux software library for TRF7970A to interface with a MIfare DesFire Ev3 RFID tag.

anh tuan hoang — Thu, 16 Jul 2026 23:09:46 GMT

Part Number: TRF7970A

We were wondering if TI can propose a software stack (C or C++) that can take advantage of the security feature of EV3? Like anti card cloning, encryption and SDM.

@anjli@ti.com @sworkman@ti.com

RF430CL330H: What is the difference between part number RF432S72FDMWRGZRQ1 and RF432S72FDKWRGZRQ1

Eddie Gonzalez — Tue, 14 Jul 2026 16:07:38 GMT

Part Number: RF430CL330H

Hello,

Can you please tell me what the difference between PN: RF432S72FDMWRGZRQ1 vs RF432S72FDKWRGZRQ1 is?

Thank you.

RI-TRP-DR2B: 3D Cad Data Request of RI-TRP-DR2B-40

kubra Aksu — Mon, 13 Jul 2026 12:16:39 GMT

Part Number: RI-TRP-DR2B

Hello

We need 3D Cad Data of RI-TRP-DR2B-40 with in step format. Could you please share with me by e-mail? If you need that i had a offer for the product i can share it.

CC2591: 2.2 Ghz peak observed in EMI testing

Akhil Aithal — Tue, 07 Jul 2026 07:56:33 GMT

Part Number: CC2591
Other Parts Discussed in Thread: CC2520

Hello,

we are using a CC2520 zigbee transmitter in combination with a CC2591 range extender for our product. While carrying out the EMI testing, we find that there exists a 2.2GHz peak along with our intended 2.4GHz signal. The magnitude of the signal is comparable to the 2.4GHz signal. We are using a test software to transmit every 10-100ms and we are able to set the channel and transmit power. What we observe is that the channel and transmit power of our target signal at 2.4GHz is behaving as per our setting, but the unintended signal at 2.2GHz remains unchanged in its frequency as well as power for any setting.
I am looking to find the root cause and potential solutions for this. It would be very helpful if you could support.

Thank you.

Regards,

Akhil

CC2340R5: openocd and cc2340r5 launchpad

Andy Rutter — Fri, 03 Jul 2026 21:56:40 GMT

Part Number: CC2340R5

Which openocd board .cfg file should I use for the cc2340r5 launchpad development board?

-- Andy

CC2662RQ1-BCU-EVM: Available to Purchase

Caitlyn Cavanagh — Tue, 30 Jun 2026 19:38:25 GMT

Part Number: CC2662RQ1-BCU-EVM

Hello, is the CC2662RQ1-BCU-EVM available to purchase? If not, can you recommend a similar product that is available?

TRF7970A: RX pin voltage level issue

user5883945 — Mon, 29 Jun 2026 14:10:12 GMT

Part Number: TRF7970A

Dears,

The datasheet describes that in direct mode 0, when the RX pin does not emit waves, it is at a low level. However, when I tested that it does not emit waves, the RX pin is at a high level. Is there any difference between the two?

CC8520: Input Voltage Clarification

Alex Segler — Fri, 26 Jun 2026 14:11:58 GMT

Part Number: CC8520

Hello team - can you tell me if there is a configuration of CC8520 within your recommendations that is compatible with 1.8V logic? We are trying to avoid a level shifter and the datasheet does not provide logic voltage thresholds. Assuming V(high)=0.7Vcc, I think it would be valid to run CC8520 at Vcc=2.0V and that should allow it to be compatible with logic levels.

Thanks!

LP-EM-CC2745R10-Q1: Release-to-Market Date

TI-CSC — Wed, 17 Jun 2026 11:58:46 GMT

Part Number: LP-EM-CC2745R10-Q1

Hello E2E Experts,

When will the multiple antenna booster pack (as shown in the video), be released to mass-market?

www.ti.com/.../6366746223112

Regards,

TICSC

CC2500: Specific Tools for RF Design

Atilano Valadez — Mon, 15 Jun 2026 15:12:07 GMT

Part Number: CC2500
Other Parts Discussed in Thread: CC2340R5, CC2340R2

1.- Could you please specify the mandatory components that need to be purchased to implement the attached design using the CC2500 , PIC18F46K42 and ATECC608B?

2.- How many each?

CC2500: Firmware Example Using CC2500

Atilano Valadez — Fri, 12 Jun 2026 16:50:55 GMT

Part Number: CC2500

Could you please provide a firmware example demonstrating how to use the CC2500 transceiver?

TMS3705: TMS3705 ISO 11785 HDX Tag Reading Failure – Abnormal Waveforms at SENSE and SFB Pins

Derek Wu — Thu, 11 Jun 2026 06:34:48 GMT

Part Number: TMS3705
Other Parts Discussed in Thread: UCC27524

Dear TI Experts,
I am using the TMS3705 for reading ISO 11785 HDX tags. The schematic is based on the standard TMS3705 HDX reference design, but the reader is not able to successfully read tags.
The 134.2 kHz carrier for the antenna is generated by another chip, so the TMS3705’s own antenna driver is not used. The UCC27524’s UCC_EN pin is used to enable/disable the carrier output.
Below is the current situation (waveform names correspond to the test points; e.g., 1_RX_ANT_3.png shows the waveform at net RX_ANT_3, and so on):

Waveform 1_RX_ANT_3.png: Although there is some sawtooth distortion, the 134.2 kHz signal looks reasonably standard.
Waveform 2_BAV99,215.png: After passing through the BAV99,215 limiter, the signal is still 134.2 kHz.
Waveform 3_R36_C60.png: After the AC coupling capacitor C60, the negative portion of the waveform disappears (as expected).
Waveform 5_SENSE.png: At the SENSE pin (after resistor R36), the waveform becomes abnormal.
Waveform 6_SFB.png: The waveform at the SFB pin is also clearly distorted.

My questions are:

What is causing the distortion of the waveforms at the SENSE and SFB pins?
How should I modify the circuit to fix this?

Thank you very much for your help!

CC2340R2: REQUEST FOR IBIS MODEL

ramakrishna Sanga — Thu, 11 Jun 2026 06:25:33 GMT

Part Number: CC2340R2

Dear TEXAS INSTRUMENT Team,

I hope this message finds you well.

I Want CC2340R21N0RGER this IC's IBIS Model. Could you please Share Them.

Thank you for your time and support. I look forward to your response.

Best regards,
Argus Embedded Systems.

RF-HDT-DVBB: Availability of stock

Dean Carter — Wed, 10 Jun 2026 06:25:59 GMT

Part Number: RF-HDT-DVBB

Hi,

I am needing 10000 units of the RF-HDT-DVBB-N2, can I please have the availability for the RF-HDT-DVBB-N2, if they are not in stock when would they be next available?

Regards

Dean Carter

TRF7970A: Operating Temperatures of RFID IC's with NFC

Rashad Rolle — Tue, 09 Jun 2026 15:56:50 GMT

Part Number: TRF7970A

I am currently searching for an NFC chip with an operating temperature between 150 - 204 degrees Celcius. Would you happen to have anything available?

LP-EM-CC2745R10-Q1: How Can I do OTA Firmware Update?

TI-CSC — Tue, 09 Jun 2026 10:04:25 GMT

Part Number: LP-EM-CC2745R10-Q1

Hello E2E Experts,

I would like to know how OTA update can be done for LP-EM-CC2745R10-Q1 LaunchPad Development Kit for SimpleLink Bluetooth Low Energy MCU.

Regards,

TICSC

RF-HDT-DVBB: RF-HDT-DVBB

Dean Carter — Tue, 09 Jun 2026 02:34:06 GMT

Part Number: RF-HDT-DVBB
Other Parts Discussed in Thread: RF-HDT-DVBE

Hi,

I am after the 10000 units of the RF-HDT-DVBB, can you please tell me when you will have them stock?

My customer is currently using the RF-HDT-DVBE, would the RF=HDT-DVBB be compatiable?

Thank you for your help

Dean Carter

TPS54531: Request for Design Review – TPS54531 3.7V / 5A for RM520N-GL Load

mahesh p — Wed, 03 Jun 2026 10:08:05 GMT

Part Number: TPS54531
Other Parts Discussed in Thread: TPS54538

Dear Sir & Madam,

I am currently designing a DC-DC buck converter using the TPS54531.

My design specifications are:

Input Voltage: 5V to 26V
Output Voltage: 3.7V
Output Current: up to 5A

The load for this power supply is the RM520N-GL 5G module. As per the module datasheet, it is mentioned that “the continuous current capability of the power supply should be at least 3.0A.” I understand that the module may also draw higher transient (peak) current during transmission.

I have prepared the schematic and BOM based on the TPS54531 datasheet and design guidelines. I have attached these documents along with the RM520N-GL datasheet for your reference.

Could you please review my design and advise on the following:

Is TPS54531 suitable for this application, considering the load current and transient requirements?
Are the selected components (inductor, capacitors, feedback Resistor) appropriate for stable operation?
Any recommended changes in the circuit or BOM to improve performance, transient response, and thermal reliability?

Your guidance will be very helpful in ensuring a robust design.

Thank you for your support.

Best regards,
Mahesh.P

TPS54531.pdf TPS54531DDAR_BOM.xlsx Quectel_RM520N-GL_Hardware_Design_V1.0 (2).pdf

DAC39J84EVM: FPGA Board Selection

Ajeet Rawat — Sat, 30 May 2026 11:01:46 GMT

Part Number: DAC39J84EVM

We are planning to buy DAC39J84EVM anlong with EK-U1-ZCU102-G FPGA Board for producing Arbitory/ Sine Wave Waveforms at upto 500MHz. Please advice Suitability.
We are a startup Company with limited financial resources.

CC8530: CC8530+CC2592 Range issue

Srilakshmi H — Thu, 28 May 2026 11:28:15 GMT

Part Number: CC8530
Other Parts Discussed in Thread: CC2592, , CC2591

Hi Team,

The current implementation using CC8530 with CC2592 is exhibiting a communication range limitation of approximately 40 m under near line‑of‑sight conditions, which is significantly lower than the expected performance based on the device capabilities,

Please guide how the Range can be improved ?

Regards,
Srilakshmi H

TMS320F28069: Powerline Communication Development Kits

greeneyehawk — Wed, 20 May 2026 16:56:52 GMT

Part Number: TMS320F28069

Hi,

I was wondering if there are any active powerline communication development kits that provide networking protocols such as G3?

Best,

TMS37145: Allowed LF receive frequency range (min/max)

Ryu Yamashita — Wed, 20 May 2026 12:18:03 GMT

Part Number: TMS37145

Hi team,

Background:
We are reviewing an existing LF immobilizer system and identified TMS37145 as the transponder. The public datasheet lists only the typical resonant frequency of 134.2 kHz.

Questions:

What is the guaranteed minimum and maximum LF receive frequency for TMS37145?
Is the allowable frequency deviation specified as absolute (kHz) or percentage, and under which conditions (temperature, coil Q, coupling)?

Best Regards,
Ryu.

TMS3705: Signal distortion after R36 in TMS3705 RX input

Derek Wu — Fri, 15 May 2026 03:04:09 GMT

Part Number: TMS3705

Hi,

I am seeing severe waveform distortion after R36 in my TMS3705 receiver circuit:

* Frequency: approximately 134 kHz
* Before R36: roughly sinusoidal, peak-to-peak ~0.74 V
* After R36: distorted, peak-to-peak ~1.39 V, with sharp spikes and flattened edges

The RC network (R36 + C60) seems to cause the distortion because the RC time constant (~22 us) is much larger than the signal period (~7.5 us). The BAV99 diodes may also contribute to the spikes.

Question: How should I modify R36, C60, or the clamping diodes to reduce waveform distortion while keeping the signal within the TMS3705 input range?

Thanks.