Simulation, hardware & system design tools forum - Recent Threads

LM5148: LTSpice model of LM5148-Q1

magnetocircuit — Fri, 30 Oct 2026 22:16:27 GMT

Part Number: LM5148
Other Parts Discussed in Thread: LM5149-Q1,

Hi all,

I am looking to run simulations of the LM5148-Q1 in LTSpice. I saw on previous forum posts that there is an available model of the LM5149-Q1 but that the unencrypted model that can be used in LTSpice requires an NDA.

Would it be possible get in touch with someone who can set this up for me?

Thank you!

PSPICE-FOR-TI: Unable to insall Pspice for TI - Cadence server unavailable

Peter Shersby — Fri, 30 Oct 2026 18:24:13 GMT

Part Number: PSPICE-FOR-TI

Like many others, i have been approved but unable to use the installer because cadence site is not reponding.
Is there a work--around or any idea when this will be beak up

18:20:12 30 October 2026 : parameter count = 1
18:20:12 30 October 2026 : -wrapper
18:20:12 30 October 2026 : Module Name: TIPSpice.exe
18:20:12 30 October 2026 : Server OS = False
18:20:12 30 October 2026 : Operating system version : 10.0.0.0
18:20:12 30 October 2026 : Checking for proxy
18:20:12 30 October 2026 : The remote server returned an error: (403) Forbidden.
18:20:12 30 October 2026 : Response error : Forbidden
18:20:12 30 October 2026 : Checking if Licensing URL is accessible
18:20:13 30 October 2026 : Initializing
18:20:13 30 October 2026 : Downloading URLs file from : https://pcb.cadence.com/startPages/PSpiceTI_data/TI_URLs.txt
18:20:13 30 October 2026 : Exception occured while downloading file : https://pcb.cadence.com/startPages/PSpiceTI_data/TI_URLs.txt
18:20:13 30 October 2026 : The remote server returned an error: (403) Forbidden.
18:20:13 30 October 2026 : Response error : Forbidden
18:20:13 30 October 2026 : Response Description: Forbidden
18:20:13 30 October 2026 : C:\Users\<username>\AppData\Roaming\Cadence\PspiceTIInstall\TI_URLs.txt bytes downloaded = 0
18:20:13 30 October 2026 : Error occured while downloading URL file
18:20:13 30 October 2026 : Error Message: The remote server returned an error: (403) Forbidden.
18:20:13 30 October 2026 : Message: Unable to access the URL required for installation. Check if URL is accessible and then try again.
URL: https://pcb.cadence.com/startPages/PSpiceTI_data/TI_URLs.txt
Error code: Forbidden
Error Description: Forbidden
View log file for details at C:\Users\<username>\AppData\Roaming\Cadence\PspiceTIInstall\cdsPspiceTIlog.txt

And fron network status

18:20:12 30 October 2026 : *****CONNECTION STATUS CHECK*****
18:20:12 30 October 2026 : Internet Connection : Available (Passed)
18:20:12 30 October 2026 : Security Protocol TLS 1.2: Available. If PSpice for TI installation fails, unblock TLS 1.2
18:20:12 30 October 2026 : Proxy Test : Proxy Credentials not needed
18:20:13 30 October 2026 : Unable to access the URL required for installation
18:20:13 30 October 2026 : URL : https://pcb.cadence.com/startPages/PSpiceTI_data/TI_URLs.txt
18:20:13 30 October 2026 : Error Message : The remote server returned an error: (403) Forbidden.
18:20:13 30 October 2026 : Status Code: Forbidden
18:20:13 30 October 2026 : Status Description : Forbidden

PSPICE-FOR-TI: PSpice

Juan Jacinto Montenegro — Fri, 30 Oct 2026 13:35:45 GMT

Part Number: PSPICE-FOR-TI

Hello, I am Juan, from Rother.

We have tried to install PSpice for TI, but we get the following error message.

Regards,

Juan

PSPICE-FOR-TI: direct download link to the full offline installer zip package

Meghna Chatterjee — Fri, 30 Oct 2026 09:58:40 GMT

Part Number: PSPICE-FOR-TI

Unable to install the Pspice on system. Kindly help in providing a zip package for Pspice for TI.

PSPICE-FOR-TI: PSpice for TI Installation Fails – HTTP 403 Forbidden

franck Borel Kana Zambou — Thu, 29 Oct 2026 08:41:35 GMT

Part Number: PSPICE-FOR-TI

Hello TI Support Team,

I am an Electrical Engineering student at RPTU Kaiserslautern, Germany.

I downloaded PSpice for TI from the official website, but the installation fails with the following error:

Error: Unable to access the URL required for installation.

URL: https://pcb.cadence.com/startPages/PSpiceTI_data/TI_URLs.txt

Error code: Forbidden (HTTP 403)

I have already tried:

Accessing the URL directly through my web browser. It returns HTTP 403 Forbidden.
Using another internet connection via my iPhone's mobile hotspot. The same error occurs.
Running the installer on Windows.

The installation still fails.

Could you please investigate whether the Cadence download server is experiencing an issue?

Is there an alternative official download link or an updated offline installer available?

I can provide the installation log file and screenshots if necessary.

Thank you for your assistance.

Best regards

CODECOMPOSER: EnergyTrace Live: Python tool for live EnergyTrace capture and analysis

Arthur Obici — Wed, 28 Oct 2026 19:12:03 GMT

Part Number: CODECOMPOSER
Other Parts Discussed in Thread: ENERGYTRACE

I developed EnergyTrace Live, a Python tool that uses TI’s stune utility to capture EnergyTrace data and display current consumption in a live plot. It saves the captured data as CSV and supports point and interval analysis, energy calculations, and long-running captures.

I developed it to make the measurement and analysis workflow more convenient. The source code, setup instructions, and screenshots are available here:

https://github.com/AcenoTecnologia/energytrace-live

I have used it with CC1352 with an XDS110 probe and CCS 21.01 on Windows. I’d appreciate feedback on the workflow and any compatibility experiences with other supported TI devices or CCS versions.

This is an independent community project and is not an official TI tool.

DP83TD510E-PODL-EVM: Designing for implementing 10BASE-T1L technology into a new MPU

John Kriskey — Wed, 28 Oct 2026 19:00:20 GMT

Part Number: DP83TD510E-PODL-EVM
Other Parts Discussed in Thread: DP83TD510E

We are considering implementing 10BASE-T1L technology into a new PDU controller, if I understand correctly the DP83TD510E typically would require a 48 to 54VDC/60~80W PSU for 1000 meter long runs between 2 nodes using Single Pair Ethernet (SPE) 18~22AWG copper Hybrid Bulk Cable.

But if we wanted to stay around the 50 meter (165 feet) maximum length is it technically feasible to use standard Cat 6A ethernet cable without the additional PSU?

From what I understand a typical modern day data center server racks are setup to have the primary rack to be at the longest distance at approximately 50meters from the network switch & the remaining number of racks (between the primary rack & network switch) are all connected individually back to the network switch?

Our ARM based MPU contained within the PDU has 2 available 1000Base-T1 MAC PHY which we would like to try avoiding the use of SPI to MAC PHY topology, using full duplex mode (prefer to avoid using half-duplex).

We do not plan to use PoDL (Power over Data Lines), we just plan to only use the 2 data lines, GMAC0 for remote GB to possibly 2 RJ45 ports & GMAC1 for 100Base-T1L multiplexed out to 2 RJ45 ports

We would like to use our standard step-down converters to take our PSU 12V (powering our MPU) down to the voltage needed to supply all of the PHY chips for the 50 meter or less lengths.

If 50m is too long without PoDL, what would our theoretical maximum point to point cable length be?

Additionally:
What would it look like to have the PHY chips to support the following scenarios:
Gigabit remote access using GMAC0 and 10BaseT1-L on GMAC1 (Scenario for Primary)
Gigabit remote access using GMAC1 and 10BaseT1-L on GMAC0 (Scenario for Alternate)
Separate 10BaseT1-L connections on GMAC0 and GMAC1 (Scenario for Secondaries)
Being able to swap between these scenarios at run-time with MUX circuitry as needed based on configuration

If this is the inccorect Forum please suggest the correct one to use

PSPICE-FOR-TI: PSpice for TI Installation Fails — HTTP 403 Forbidden (Cadence Server)

Thameur Chebbi — Wed, 28 Oct 2026 16:31:00 GMT

Part Number: PSPICE-FOR-TI

Hello TI Support Team,

I successfully downloaded the PSpice for TI installer, but installation fails because the installer cannot access the following Cadence URL:

https://pcb.cadence.com/startPages/PSpiceTI_data/TI_URLs.txt

Error details:

Error code: Forbidden (HTTP 403)
Error description: Forbidden
Browser response: CloudFront 403 — "The request could not be satisfied."

Troubleshooting already performed:

Opened the URL directly in a browser and reproduced the same 403 error.
Tested using my regular internet connection.
Tested using a separate mobile hotspot, with the same result.

I need PSpice for TI to simulate the LMR51635X regulator using TI's official encrypted PSpice transient model (SLUM929).

Could you please confirm whether this is a known Cadence server/CDN issue or an access restriction affecting my region (Tunisia)?

Is there an official alternative download or installation method, or an estimated restoration date?

I can provide screenshots and the installer log if needed.

Thank you for your assistance.

PSPICE-FOR-TI: PSpice for TI installation fails – 403 Forbidden on pcb.cadence.com

Tiago Silva — Wed, 28 Oct 2026 15:45:42 GMT

Part Number: PSPICE-FOR-TI

Subject: PSpice for TI installation fails – 403 Forbidden on pcb.cadence.com

Hello,

I am an electrical engineering student at ISEP (Portugal). My PSpice for TI request was approved today and I received the access key by email, but the installation fails before it starts.

Error shown by the installer:
"Unable to access the URL required for installation. Check if URL is accessible and then try again.
URL: https://pcb.cadence.com/startPages/PSpiceTI_data/TI_URLs.txt
Error code: Forbidden"

When I open that URL in a browser, I get a CloudFront page: "403 ERROR – The request could not be satisfied. Request blocked."

What I have already tried:
- Two different networks (home Wi-Fi and mobile data hotspot), with no VPN or proxy
- Running the installer as administrator

The problem is the same on both networks, so it looks like the request is being blocked on the server side rather than by my network.

myTI account: 1242097@isep.ipp.pt
Operating system: Windows
I have attached a screenshot of the error and the installer log (C:\Users\tiago\AppData\Roaming\Cadence\PspiceTIInstall\cdsPspiceTIlog.txt).

Could you please check whether access from Portugal is being blocked, or tell me another way to complete the installation? I need the software for a university course.

Thank you for your help.

Best regards,
Tiago Silva

AM6442: OnDie parasitics of AM6442 for power aware SI Simulation

Arnaud — Wed, 28 Oct 2026 14:22:12 GMT

Part Number: AM6442

Hi TI Team,

I'm currently performing an LPDDR4 SI simulation using the AM6442. The simulation is power-aware, so I would like to include the on-die parasitics in my simulation model to obtain more realistic results.

I am using the AM6442 IBIS model (SPRM810), but I could not find any information regarding the on-die parasitic parameters.

I only found the resistance, inductance, and capacitance matrices describing the package parasitics for each pin.

In my Cadence simulation software, I can specify the following three parameters for the on-die parasitics:

Short Resistor - It is a connection between the input and output pins of a model. Generally, this value is obtained from the chip-level model extraction; if you know the equivalent resistance from the IO cell to bump in a model, you can apply the value on this section.
PDS Resistor - It is the resistance value from the IO cell to bump, which forms the power-to-ground loop resistance. It is used in P/G modeling by the RC circuit, as shown in the above schematic model.
PDS Capacitor: It is connected in a series with the PDS resistor and connected to ground on the other end to form a parallel RC circuit in P/G modeling.

Would it be possible to provide the following on-die parasitic value for the AM64x:

Short resistor
PDS resistor
PDS capacitor

Thank you for your support,

Best regards

Arnaud ANGLADE

PSPICE-FOR-TI: I'm unable to install because access is denied. Is there a solution?

user6365974 — Wed, 28 Oct 2026 12:05:26 GMT

Part Number: PSPICE-FOR-TI

As the title says, Is there a solution?

PMP41139: I need complete BOM of PMP41139

Zain ur Rehman — Wed, 28 Oct 2026 11:43:11 GMT

Part Number: PMP41139

I have found BOM but is it complete? Then only need the information and part number of magnetics used in the design.

PSPICE-FOR-TI: Subject: Unable to Install PSpice for TI – "Forbidden" Error While Accessing Installation URL

Motilal Suthar — Wed, 28 Oct 2026 04:45:53 GMT

Part Number: PSPICE-FOR-TI

Dear Texas Instruments Support Team,

I am attempting to install PSpice for TI on my corporate Windows system, but the installation is failing with the following error message:

Unable to access the URL required for installation. Check if URL is accessible and then try again.

URL:

https://pcb.cadence.com/startPages/PSpiceTI_data/TI_URLs.txt

Error code: Forbidden

Error Description: Forbidden
Additional details:

Software: PSpice for TI
Operating System: Windows 11
Installation Type: Fresh installation
Network: Corporate network environment
Log File Location: C:\Users<username>\AppData\Roaming\Cadence\PSpiceTIInstall\cdsPspiceTIlog.txt

The installer appears to be unable to access the required URL and returns a "Forbidden" error. I would appreciate your guidance on the following:

Whether this URL is currently active and accessible.
If there are any known issues with the PSpice for TI installer.
Whether a proxy, firewall, or corporate network setting may be preventing access. ( facing same issue with personal laptop )
If an offline installer or alternative installation method is available.

Please let me know if you require the installation log file or any additional information for troubleshooting.

Thank you for your support.

Best Regards,

Motilal Suthar
Associate Engineer
motilal.suthar@vertiv.com

TMUX6612-Q1: Pull-down

Juan Jacinto Montenegro — Tue, 27 Oct 2026 16:22:50 GMT

Part Number: TMUX6612-Q1
Other Parts Discussed in Thread: SN74LVC2G66-Q1, TDEL3G510-Q1, TDEL3G510

Hello, I am Juan.

The TMUX6612-Q1 datasheet specifies that the SEL1–SEL4 signals have internal pull-down resistors. What is the value of the internal pull-down resistors on the SEL1–SEL4 pins of the TMUX6612-Q1?

On the other hand, we want to use the SN74LVC2G66-Q1. Does this component also have internal pull-down resistors on pins 1C and 2C?

Regards,

Juan

TAS2573EVM-DOC-CERT: I need to use PPC3 tool for TAS2572 DUAL-MONO EVM Board. After I request PCC3 tool, it show "Access denied"

Yan Yuan — Tue, 27 Oct 2026 08:37:02 GMT

Part Number: TAS2573EVM-DOC-CERT

PSPICE-FOR-TI: PSpice for TI installation failed to find URL

Lance Day — Mon, 26 Oct 2026 16:47:26 GMT

Part Number: PSPICE-FOR-TI

I have received an access code for PSpice for TI, downloaded the installer, but it fails at the start with a message unable to reach a URL. Please can I have a direct link to the full installer to bypass this.

UPDATE: I've raised it with our TI FAE. However as noted here & elsewhere this seems to primarily be a Cadence issue. I'm not a network expert but Gemini seems to think this might be Cadence over-tightening their firewall, possibly in response to DDoS or similar.

TPSM843620: PAD LENGTH OF PINS 8 AND 14 MISSING

TYLER SWEARENGIN — Mon, 26 Oct 2026 15:40:33 GMT

Part Number: TPSM843620

Afternoon,

Can the pad lengths of these pins be verified?

Thanks

Tyler

PSPICE-FOR-TI: Unable to access URL required for installation. Error Code: BadGateway

Kylie Auerbach — Mon, 26 Oct 2026 15:13:50 GMT

Part Number: PSPICE-FOR-TI

I am unable to execute installation for Pspice for TI, as the URL is not resolvable. Is there a direct offline download that I can access?

PSPICE-FOR-TI: PSpice for TI installation error

종혁 박 — Mon, 26 Oct 2026 15:04:58 GMT

Part Number: PSPICE-FOR-TI

Hello,

I cannot install PSpice for TI on Windows 10.

The installer cannot resolve pcb.cadence.com when trying to download TI_URLs.txt. I also tested the URL on my iPhone using cellular data, but it did not open.

The log shows:

Remote name could not be resolved: 'pcb.cadence.com'
TI_URLs.txt bytes downloaded = 0

Could you please help me resolve this issue?

Thank you.

PSPICE-FOR-TI: PSpice for TI installer cannot resolve Cadence URL (TI_URLs.txt)

Gökalp Aksoy — Mon, 26 Oct 2026 13:07:53 GMT

Part Number: PSPICE-FOR-TI

Hello,

I cannot install PSpice for TI. The installer reports:
“Unable to access the URL required for installation”
URL: https://pcb.cadence.com/startPages/PSpiceTI_data/TI_URLs.txt
Error: “Uzak ad çözümlenemedi: 'pcb.cadence.com'” (the hostname could not be resolved).

The issue reproduces on both my home Wi-Fi and a mobile hotspot. I also tried Cloudflare DNS (1.1.1.1 / 1.0.0.1), with no change. An independent Google Public DNS lookup returns a CNAME from pcb.cadence.com to d3kw5v45y2yh8f.cloudfront.net, but no A record for that target.

Could you confirm whether this Cadence/CloudFront DNS record is currently valid, and advise how I can install PSpice for TI while this endpoint is unavailable?

LSF0108-Q1: I2C

Juan Jacinto Montenegro — Mon, 26 Oct 2026 11:24:48 GMT

Part Number: LSF0108-Q1

Hello, I am Juan from Rother.

We are designing a custom PCB using the LSF0108-Q1 bidirectional voltage-level translator to interface the 1.8 V I2C signals with a 3.3 V I2C bus.

We need to determine the appropriate pull-up resistor values for SDA and SCL on the B side of the LSF0108-Q1.

In Section 9.2.1.2.2 of the datasheet, TI recommends sizing the pull-up resistors to limit the current through the internal pass transistor to approximately 15 mA. However, the datasheet also provides resistor values for lower currents, including 8 mA, 5 mA and 3 mA.

Since our application uses standard open-drain I2C signals, we would like to clarify the recommended design approach for this application.

Could you please clarify the following points?

Recommended current: What current should we target when sizing the pull-up resistors for SDA and SCL when using the LSF0108-Q1 for a 1.8 V to 3.3 V I2C interface? Would designing for approximately 3 mA through the translator be appropriate for this application?
Pull-up resistor calculation: Is the equation provided in the datasheet intended as a maximum-current design criterion, or should the recommended resistor values in Table 9-4 be considered the preferred starting point for I2C applications?
Pull-ups on both sides: When pull-up resistors are installed on both the A and B sides, how should the total current be evaluated to ensure that the I2C devices can maintain a valid LOW level? We would particularly appreciate clarification regarding the current that must be sunk by the devices connected to the bus versus the current flowing through the LSF0108-Q1 pass transistor.
Recommended implementation: For a 1.8 V / 3.3 V I2C interface, are there any specific pull-up resistor values or design recommendations you would suggest for reliable operation with the LSF0108-Q1?

Our objective is to select suitable resistor values that ensure valid logic levels and compliant I2C rise times without unnecessarily increasing the current drawn when either line is LOW.

Thank you for your assistance.

Best regards,
Juan

PSPICE-FOR-TI: Subject: PSpice for TI 23.10.001 installer cannot resolve pcb.cadence.com

Rui Cardoso — Mon, 26 Oct 2026 10:23:19 GMT

Part Number: PSPICE-FOR-TI

The PSpice for TI installer (PSpice-For-TI_setup.exe, version 23.10.001), downloaded on 26 October 2026, fails before sign-in with:

Unable to access the URL required for installation.
https://pcb.cadence.com/startPages/PSpiceTI_data/TI_URLs.txt
The remote name could not be resolved: pcb.cadence.com

Checks on 26 October 2026:
- Windows getaddrinfo fails for pcb.cadence.com.
- Google public DNS queries for both A and AAAA return the CNAME d3kw5v45y2yh8f.cloudfront.net, without any A or AAAA address.
- https://cdsplicwc.cadence.com/chws/test/connection.html returns HTTP 200 and Successful connection.

Could you confirm the current installer configuration URL and provide an updated official installer or an official alternative installation procedure?

The installer log is available if required. No system DNS, hosts, firewall, or TLS settings have been changed.

PSPICE-FOR-TI: Installation error: ://cadence.com unreachable / Unable to resolve remote name

Amos Antonio Titone — Sun, 25 Oct 2026 13:54:47 GMT

Part Number: PSPICE-FOR-TI

Hello TI Support Team,

I am trying to install "PSpice for TI" on a Windows machine, but the installation consistently fails right at the beginning.

I am getting the error regarding the unreachable Cadence URL:
"Unable to access the requested URL for installation. URL: https://cadence.com. Error description: The remote name could not be resolved: '://cadence.com'"

To troubleshoot this, I have already tried the following steps with no success:
1. Checked internet connection (browsing works perfectly).
2. Changed DNS settings to Google DNS (8.8.8.8 / 8.8.4.4).
3. Temporarily disabled Windows Defender Firewall and Antivirus.
4. Fully updated my myTI profile details (shipping address, company/university, etc.).
5. Tried installing using a mobile hotspot connection (different ISP) to bypass any local router restrictions.
6. Executed the installer as an Administrator.

Despite all of this, the error remains identical. It seems the remote server '://cadence.com' is completely down or rejecting connections.

Could you please assist me with this issue? Is there a standalone offline installer or an updated installation package available that does not require reaching that specific URL during setup?

Thank you for your help.

TPSI31P1-CALC: PSpice Simulation Aborted with ORPSIM-16550 Divide-by-Zero Error

suresh rajaram — Sat, 24 Oct 2026 16:41:04 GMT

Part Number: TPSI31P1-CALC
Other Parts Discussed in Thread: TPS62400

Dear TI Support Team,

I am trying to simulate the TI gate-driver circuit using the PSpice model provided by Texas Instruments. However, the transient simulation fails after some time with the following error messages.

PSpice Error Log:

Bias point calculated
Transient Analysis
ERROR(ORPSIM-16550): Floating point computation failed during matrix solution.
Possible solutions: 1) Ensure that all device parameters are in valid range.
2) Try using .options LIMIT

Divide by Zero, Divide
INTERNAL ERROR -- Divide by Zero, Divide
Run aborted

License check-out time = 1723.03
Total job time (using Solver 1) = 440.64

INFO(ORPROBE-3188): Simulation aborted

The DC bias point is calculated successfully, but the simulation aborts during transient analysis.

Could you please help me investigate the cause of this error and suggest the necessary changes to the PSpice model or simulation settings?

Please let me know if you require the simulation schematic, PSpice project files, or the complete .out log for further analysis.

Thank you for your support.

Best regards,
Suresh R

PSPICE-FOR-TI: PSpice for TI installation fails: unable to resolve pcb.cadence.com

Seungmin Yang — Fri, 23 Oct 2026 18:09:46 GMT

Part Number: PSPICE-FOR-TI

Hello TI Support,

I am unable to install PSpice for TI on my Windows PC. The installer stops with the following error:

“Unable to access the URL required for installation. Check if URL is accessible and then try again.”

URL: https://pcb.cadence.com/startPages/PSpiceTI_data/TI_URLs.txt

The error description is displayed in Korean and translates to:
“The remote name could not be resolved: 'pcb.cadence.com'.”

I have checked the following:

Installation fails on my university Wi-Fi network.
The same installation error occurs when my PC is connected to a mobile hotspot.
The URL does not open in a browser on my PC using the hotspot.
The URL also does not open directly on my phone using mobile data.
Running “nslookup pcb.cadence.com” on the university network returns the domain name but no IP address.

Could you please confirm whether this installation URL is still valid and whether there is a known DNS or server availability issue? If an updated installer or an official alternative installation method is available, please let me know.

Thank you for your assistance.