Power management

Hi all,Hoping this is this right subsection to post the following question...I'm reading the STPD01 datasheet and it states its available I2C addresses : 4, 5, 6, and 7.Reading to general I2C documentation, it seems that these addresses are reserved to I2C HS-Mode. So, is STPD01 an HS-Mode controller or a regular (100kHz) device? Links:- https://www.ti.com/content/dam/videos/external-videos/en-us/8/3816841626001/6241024036001.mp4/subassets/adcs-introduction-to-i2c-reserved-addresses-presentation.pdf- https://i2cdevices.org/addresses- https://en.wikipedia.org/wiki/I2C- https://learn.adafruit.com/i2c-addresses/the-list

If I have only 5V input. what to do with the FB pin?

What does the appearance of KF50BD-TR look like ? Does it have pin 1 marker?Can you provide the relevant drawings?

The STM6905 datasheet says in Table 2 that there is an internal 10k pull-up on RST#, which seems wrong since that's an open-drain output. Then in Section 2.6 and in Section 3 it says that an external pull-up to VCC should be used.

Ciao, [English was established as the common basis so that everyone in the global community can understand each other (see ST Community Terms and Conditions - STMicroelectronics Community, article 10)] I recently purchased a new STEVAL-L99615C evaluation board and, before connecting any battery pack, I checked the resistance between the cell inputs and ground (GND). I measured: C1 → GND: a few ohms C2 → GND: a few ohms C3 → GND: a few ohms C4 → GND: several megaohms C5 → GND: several megaohms C0 → GND: a few kiloohms The board has never been powered with batteries connected and has never been exposed to reverse polarity.Is this behaviour expected because of the input protection/balancing network, or could the board be faulty?Has anyone else encountered the same issue? Thank you. Ho acquistato di recente una nuova scheda di valutazione STEVAL-L99615C e, prima di collegare qualsiasi pacco batterie, ho verificato la resistenza tra gli ingressi delle celle e la massa (GND). Ho misurato:

I could able to find only .hex output file for this demo app. Where is the source code ?

Hello everyone,My apologies if this is in the wrong forum. I have a STEVAL-BMS114TX evaluation board and I'm wondering what to do with unmounted cells, since my pack is 5s. The datasheet for the L99BM114 says to short the unused PCB connectors together, but this definitely cannot be done on its corresponding evaluation board. Does anybody have any advice on how to move forward with this? The STEVAL-BMS114TX datasheet says that it can manage from 4 to 14 battery cells, but doesn't provide much clarity on unmounted cells.Thank you for the help. 

Hii everyone,I am  designing  AC-DC board using STNRG012 IC and  used EVL012LED evaluation board for reference purpose and we are facing some  isuess1. We design input voltage range from 90-305VAC.2. PFC boost voltage range would be 450V.so which parameter need to be consider while designing for this PFC range .3.Is there similar standard core available for PQ3812 but in your document you mention it NH9 material and in datasheet there no AL value for this core so is there any another simliar core available for it.4.Also want guidance related LLC section because  my output voltage is 24V 10A  or any reference circuit for it .

Hello,I am evaluating the VND5T100AJ-E for an automotive application where I need to drive a 24V contactor. My design requirement is i need to drive the IC through the PWM signal as input.I have reviewed the datasheet but do not see explicit PWM frequency ratings. My concerns are:Does the VND5T100AJ-E support continuous PWM switching for an inductive load?If this device is not recommended for PWM, could you suggest a similar specification alternative part with the same specifications  that is specifically designed for PWM input @stmicro 

 good morning!Where can I get information about the datacode of such a chip ST1L05CPU33R?There is no information about the marking in the technical documentation.

 Could you provide technical details or reference designs for a 2W wireless charger based on the STWBC86JR?

We are evaluating the L9916 IC and need to test it with different settings. We are following the information in the Datasheet and the Programming App Note. We keep the IGN, PHASE and LAMP pins at 0V right until the moment we send the ignition sequence (although we have also tried bringing it to 5V before that in order to match the oscillogram in the app note).We also ensure that the data is valid at least until the half high period of the clock and are confident that the initial sequence matches the one described in the application note. We have tried with the clock speed from the oscillogram in the app note as well as with faster and slower clock speeds. After the initial sequence is sent, the microcontroller reconfigures the pins connected to IGN (SCL) and PH (SDA) for I2C communication. Then, even though both pins have strong external pullups, the IGN (SCL) line is brought to 0V by the L9916 and held there indefinitely. This prevents I2C communication from occuring, since

Planning L4981B as PFC controller as pre-stage to our DC-DC Convertor.Will this controller work with 400Hz can it be able to maintain unity power factor in 400Hz line as it does for 50/60Hz?Any other PFC controller recommendations will be appreciated

I am designing a LED driver board for an industrial instrument and am evaluating the ST1CC40 as a constant-current buck driver for the following application: Application requirements:• Input voltage: 5V DC (regulated)• LED: Cree XLamp XP-L2 white LED• Target forward current: 2.2A• LED forward voltage: 3V at 2.2A, Tj = 85°C  From the ST1CC40 datasheet, I have confirmed the following:• VIN range 3V–18V covers our 5V supply • Maximum limiting current 5A covers our 2.2A operating point • INH threshold VIH = 1.2V min is compatible with our 3.3V PWM signal • Duty cycle at operating point: 2.93V / 5V = 58.6% — within range • RSENSE = 97mV / 2.2A = 44mΩ (targeting 44mΩ E96 standard value) I have the following technical questions: 1. With VIN = 5V and VOUT ≈ 2.93V (duty cycle ~58.6%), is there any concern with the internal bootstrap circuit or headroom voltage at this relatively low input voltage/ applicat

Hello,I used the SPV1050 chip to connect the circuit to the STEVAL-ISV019V1 evaluation board, and measured VSTORE to be 3.9V, which did not reach VEOC and naturally did not have LDO2 output. I use the STORE pin to power my sensor node load. May I ask which part of the energy I am using at this time is from the battery?Besides, how can I make VSTORE rise to VEOC? Why hasn't my VSTORE changed under prolonged exposure to light.Can the final LDO2 output supply power to the load, or can it only serve as a reference voltage for certain devices.Thank you for your reply.

Dear STM Team,Greetings!!I am writing to request you to please support in my PCB design review, as attached.I made a prototype board based on the simulation result for my 48V to 12V20A DCDC Converter requirement by using the e-design suite platform.Kindly request you to please support in the layout review and revert with your valuable suggestions, at present we are testing the prototype board, but are not getting output voltage/current, etc.

I have some questions regarding the L78M05AB regulator IC.1. Could you please investigate the temperature at which this IC's the thermal protection actually activates?2. I have been informed that the thermal protection mechanism shuts down the output voltage.    However, when we applied heat, we observed behavior suggesting that the output appears to remain at a constant level.    If the temperature is kept at a specific value, will the output remain constant (for example, 3V)?"3. Could you please clarify the behavior when SOA protection is triggered?    Does the circuit limit the output, or does it enter a shutdown state?4. Related to SOA protection, is there any case where the voltage is reduced and latched at a certain level?5. Are there any restrictions or specifications regarding harmonics or noise on the input voltage of the regulator IC?  

Hello ST Team, could you please provide the marking code for LD59015C33R? Where can i find it on my own? A register to verify parts by codes would be great. Thanks Thilo Roth

[Moderation] Separated from the previous thread, as the STEVAL-ISV019V1 is a different topic. Hi,As the questioner mentioned, the voltage measured on the STORE pin is about 2.416V. Should we charge the battery at this time? What conditions can raise the voltage of STORE to VEOC. Thank you for your reply and your help.

Dear ST community, I'm reviewing the Vac sense circuit of STEVAL-7BIDIRCB, where the circuit uses a resistor divider to generate a low voltage of VACN and VACL for MCU. I simulated this section of circuit in LTspice, and here is my result : My Vac input is +/-256V sine waveform and VACL that I'm measuring is +/-900mV sine waveform. Based on my calculation this is a simple voltage divider and I should see +/-1.8V sine waveform. Why am I seeing 1.8V/2 = 900mV ?   I did some research and my understating is that when there is an equal resistor network each side of AC source ( N and L), Vac IN  becomes half ( 256V -> 128), but I don't understand how it is possible when my Vac input is 256V ?   

Are there any more resources to understand how to use STEVAL-HARVEST1, how does the energy flow from super capacitors to the MCU and also the back up capacitors. I feel few things are missing the schematic and the user guide. I want to first implement a small UART program with energy harvesting. Can anyone guide through steps in achieving it. How to connect this to board, does it mean I need to add any external wire from harvester solar panel and short it here?I have read https://www.st.com/resource/en/user_manual/um3539-getting-started-with-stevalharvest1-energy-harvesting-board-for-nucleowl55-stmicroelectronics.pdfhttps://www.st.com/resource/en/schematic_pack/steval-harvest1-schematic.pdfhttps://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=11369460Thanks in advance.

Is the overcurrent protection set to 3A on the STSPIN840? If so, is there a way to change the trip value of the overcurrent protection to better align with its application? I want to change it so that the overcurrent trips at 1A. Thank you!

Hi, I am designing a 25W power supply for the raspberry pi 5 for my battery powered project. The buck regulator I am using has a fixed 5V output and I want to use the STUSB4710 to offer 5V 5A to the Pi. How can I program the registers to do so via I2C? I have checked the datasheets as well as the STUSB47XX register maps but both are still quite vague on how to program.

Hello,I am using the STUSB4710 as a PD-Source in my project and have a few questions regarding its configuration. In my setup, I have not utilized the feedback configuration. Instead, I am connecting the PDO outputs of the STUSB4710 to a microcontroller. The microcontroller reads the status and subsequently adjusts the output of my buck-boost converter accordingly.However, I am facing an issue where no negotiation occurs, and the output remains fixed at 5V. I would like to know if the STUSB4710 is capable of operating in such a configuration. Specifically, is it possible to achieve successful power delivery negotiations without using the feedback mechanism?Thank you for your support!

Hello, we are having an issue where our cell voltage readings are drifting when discharging. When there is no current, the voltages all read correctly. However, during discharge, we see that cell 5 and cell 1 have lower voltage readings by about 150mV at 5A. Once discharge is ended, the voltages level off again. I have checked that this is reflected in the registers. These are our filter settings: