Others: hardware and software

I'm using a STWD100NPWY3F watchdog timer, and I can't get it working according to the datasheet. I have the following connections:VCC: 3.3VGND: GNDEN: GNDWDO: 10K pull up to VCCWDI: pull down to GND and toggled to VCC WDO stays low and keeps the MCU in a reset state. If I pull EN high, WDO goes high and the MCU operates. With EN low, even at startup, the WDO remains low. I have tried toggling WDI high and low, but WDO never changes state unless I pull EN high (which disables it).

Hi,we are trying to replace old STM1645-30 chip with new STM1645-30 but the VCC 28V (VCC and Control Voltage shorted togather) drops .Pleade Refer belowstm1645-30    Pin    Function    1    RF Input (50 Ω)    2    Ground    3    VC1 — 12 V regulated bias    4    VC2 — 28 V power supply    5    VC3 — 28 V power control supply    6    Ground    7    RF Output (30 W) Now the questions:1.Are the new and old stm1645-30 are equivalent?2.why 28V is dropiping?3.in new module pin 4 shows continuity with ground while in old modue it shows about 584 ohms4.Any suggetion regarding how to test the chip?

I check the below sequece to measure AC diagnostic with external signal. Channel#1 case:Input external signal Write IB14=73h Wait for (DB6[7] ==1) Read DB9 as AC output load magnitude(DB6[6]==1) or error code(DB6[6]==0)It would be more often in lower frequency and lower signal level, but it happens on higher frequency as well sometimes. I think measurement will be done less than 100ms, but sometimes, even when I wait for 1000ms, DB6[7] would not turn to 1.Is the above sequence is wrong? If so, could you correct my above sequence?

The ST33KTPM2I data brief tells people to send further questions to tpmsupport@list.st.com, but that address is not accessible to people outside of ST:Your message to tpmsupport@list.st.com couldn't be delivered. The group tpmsupport only accepts messages from people in its organization or on its allowed senders list, and your email address isn't on the list.

Hi everyone,I am working on a project using an STM8S003F3 MCU with ST Visual Develop (STVD), Cosmic C Compiler, and a clone ST-Link V2 programmer.I am having an issue with debugging. When attempting to start a debug session in STVD, I get the following error:Connection error (usb://usb): swim error [30006]: comm init error: chip does not answer.Important details: If I open ST Visual Programmer (STVP) and perform a few Read/Write attempts, STVP eventually starts working and can read and program the chip without issues. However, after doing this, only programming works—debugging in STVD still fails completely. Additionally, in STVP, the Erase button is grayed out and disabled. Signal levels and waveforms look fine at a quick glance on the scope (though I haven't done an in-depth signal integrity check yet). I have used a similar ST-Link clone setup before without any issues. Could this be caused by the ST-Link clone, or is it possible that the STM8 chip itself is a counterfeit/cl

Could you please provide the part marking details for M24C02-FMN6P  for visual inspection purposes?

I’m looking for data related to peak pulse Power Rating of this TVS, that includes pulse width (tp) of up to 10ms. Also, I wanted to know if there is any reliability data that is available for this component.  

For the BLUENRG-M0A Bluetooth module, what is its normal shelf life when stored in a warehouse? We plan to purchase 1000 units at one time, but it will take several years to use them up. Will long-term storage affect the product lifespan? How can we achieve long-term proper storage, and what are the environmental requirements for the warehouse?

Hello everyone,I’m working with an STM32F103C8T6 (Blue Pill) development board and facing an issue while trying to program/debug the MCU using ST-Link V2.Board used:https://robocraze.com/products/stm32f103c8t6-arm-development-boardIssue details:STM32CubeProgrammer / STM32CubeIDE does not consistently detect the targetSometimes shows “No target connected” or fails during connectionTried SWD mode with NRST connectedBOOT0 is set to 0 (Flash mode)Power supplied via USB (5V) and also tested with external 3.3VChecked SWDIO, SWCLK, GND continuityI’m not sure if this is related to board configuration, clock settings, or ST-Link connection parameters. I’d appreciate guidance on:Recommended ST-Link connection settings for STM32F103C8T6Any known issues with Blue Pill boards (pull-ups, reset circuit, USB power, etc.)Whether enabling connect under reset is mandatory for this MCUI’m still getting familiar with the forum and STM32 ecosystem, so apologies if I’ve missed something obvious. Looking forw

hi Good day,Can we seek your expertise regarding TDE1798DP top markings.is the 3rd row KWM012 pertaining to manufacturer traceability code ’KWM’?. and Date code for the last 3 digit ‘012’ which YWW, yr 2020, week 12.Thank you for your feedback.

Hello all ! Has anyone heard of the LX32F072CBT6 microprocessor? I found it when looking for the hardware used by a client.AI says me:“The LX32F072CBT6 is an alternative part number or specific designation that corresponds directly to the STM32F072CBT6 microcontroller manufactured by STMicroelectronics.” It seems to be a chinese copy of the STM32F072CBT6 but has someone some info about it? Kind regards,Michaël

Hello,I would like to confirm my interpretation of the marking M1013 on the old BUX10 transistors (TO-3 package) I’m using. I believe M stands for Malaysia and 1013 stands for week 10 of 2013 ; is this correct ?Thanks !

Hi, As mentioned in the other post that the drone frame is not symmetrical, where the propeller guards have fins with certain inclination and orientation (see [1]). I have difficultly to find the correct orientation of the drone02 frame. Since I am not quite sure how the propeller guards fins can affect the downward thrust that produces by the propellers. It would be great if someone can provide suggestion.  I enclosed two cases of the drone frame orientations as reference. NOTE: If I use Figure8 in [2] as reference, then Case1 does look correct. But taking the M2 propeller (top right of the propeller) as an example, the M2 propeller rotates counter-clockwise (CCW) direction, then I think the produced thrust will hit the guard fins and get affected?  Case 1  Case 2  Case 1: top right (for M2 motor/propeller)  Case 2: top right (for M2 motor/propeller)   Ref:[1] Steval-FCU001V2 FCU board and Steval-drone02 Drone kit issues[2] ST, How to build your own mini d

Hello,I ordered some samples of the ST732M50R component on August 26, 2026, but the order has not yet been shipped.The order number is: PRD176219.Could you please let me know if it is normal for the shipment to take this long ?Thank you in advance for your reply. Best regards,

We have 2 nos of STEVAL Drone 02. 1)We assembled correctly the motors CW & CCW 2) Propellers are also correctly assembled. We are using STBLE Drone androidapp. We are facing same problem for both the units.Propellers rotates in proper direction  but its not lifting up.instead it lifts slightly 25 cm above ground & then starts rotating around itself & moves horizontally uncontrolled. Then we have to stop it.VIDEO of Drone behaviour attached.Please suggest RegardsShirish 

Hi. I built the PCB myself at home. While working, I noticed strange anomalies in the image. The anomalies are in different places and on different photos. I asked AI but didn't get a satisfactory answer. I tried reducing the frequency without any positive effect. I suspect ESD or power supply issues. The traces are very thin, 0.4 mm for power and 0.35 mm for data. Has anyone experienced this? 

Hello,I recently purchased the STEVAL-LLL005V1 evaluation board and I am currently preparing to use it for evaluation and testing.According to the ST documentation for the board, an Android application called Led Drawer is available for controlling the LED matrix through Bluetooth Low Energy.However, I could not find the Android application on the current ST website. I have also searched for it on the Internet, but unfortunately I have not been able to find a working or reliable download of the application.Since I have purchased the STEVAL-LLL005V1 board and the Android application is part of the functionality described in the official documentation, I would like to ask whether ST still has the original application available.If the application is still available internally, could you please provide the APK file by email or by another suitable download method?If the original application is no longer officially distributed, I would also appreciate it if you could let me know whether ther

Hi ST,I have a question for application of FDA802A-VYT.Can I connect AVDD, DVDD to boost 35V voltage? I am using ISL78227 to boost 35V to VCC of FDA80A.I check the application of ST, AVDD, DVDD are connected to VCC together, and VCC max is 50V? Is it correct?  

Hello, world. I try to find answer how read that code: 2020L.  Full text on chip are:  M27C801 -100F1 52987 -2020L SINGAPORE   That 2020L need read like: WWYXX? Or YWWXX? Thank you for answer. Regards  ?

Hi friends from ST,Is there any description or comment for FDA802A PIN33, I found this pin doesn’t connect to GND like other NC PINs.I am analyzing FDA802A-VYT VCC PIN damaged on China local AMP, and found PIN33 was connected to GND by the previous engineer. (But this pin is float in ST application.)Can this PIN connect to GND cause this damage issue? I have contacted the local FAE from ST in Shanghai, and they knew nothing. 

Hello forum membersI’m busy with the implementation of a TCP server that needs to handle a TCP connection with already existing PC application that I can’t change.Everything works well as long the packets are not longer then 1500 bytes. When the packets are longer than this “magic number” LwIP is separating the packets in more than 1 piece. Is there a way to know the original length of the original packet?See print screen Wireshark: Packet with length: 1876.Debug from the controller:First read: Second read:How can I detect that these 2 reads (netconn_recv) are 1 packet? Instead of 2. I use the NETCONN API.The connection is made at the beginning and never closed during the executing of the PC application. Kind Regards 

I am troubleshooting a USB device that is not being detected by my computer. What are the main hardware and software checks I should perform to determine whether the problem is related to the USB connection, drivers, or the device itself?

This account only shares restored community content posted by members between May 22 and June 9, 2026, who did not register for the new community.[Moderation: To get answers from the English-speaking community, it is helpful to ask in English as well. I have therefore translated your text using a web-based tool] Dear STMicroelectronics Support Team,I hope this email finds you well.We are currently investigating a specific appearance issue concerning the LM335AZ in the TO-92 package. Recently, we have observed some defects at the base of the leads, in particular some copper lead exposure/oxidation. Based on our preliminary assessment, this appears to be a natural result of the lead-forming or assembly process.However, after carefully reviewing the official ST datasheet and technical documentation, we were unable to find any formal or stated specification for a specific process relating to this phenomenon.To ensure our quality control is fully clear and to address enquiries from downstre

This account only shares restored community content posted by members between May 22 and June 9, 2026, who did not register for the new community.Dear Team The TSC1801 datasheet contains the following calculation formula.What does Voutmeas mean in this formula? Thank you.

Greetings! I need STHVUP64 detailed datasheet with pinouts. How can I get it?