Power management

Posted on July 30, 2015 at 18:53I have had partial success in using the L6470 eval board.  However, I found that when I issue a GoTo (ABS_POS) command, it doesn't execute right away.  Interestingly enough, it starts executing after I send a ''disable'' command!  (A subsequent ''disable'' command it then necessary to cut power to the motor.)Any idea what might be going on?  Am I missing a step in this process?

Posted on July 29, 2015 at 08:18Dear Experts,I am currently working with L9942 Driver IC. During micro-stepping at less than 700Hz of STEP frequency input to the driver, there is no current chopping at the output coils. At frequencies greater than 700Hz there is output for coils. The same is the case for other modes as follows:1/4 mode: no currrent chopping at STEP frequency input less than 400Hz1/2 mode: no currrent chopping at STEP frequency input less than 200Hz Please help me understand the reason.  #step-input-frequency

Posted on July 24, 2015 at 02:56Hi, i get start to test a L6470H discovery board and got some problems:1.i try to connect board and pc with usb cable but it shows unknow device in windows device manager in win7-64bit but works fine in win xp 32bit.(i tried install DFU driver in DFUse software and SPINFamily Evaluation Tool software but still not work)2.i start board firmware (place boot jumper) but the ready and led error light the motor not work, i used ulink to upload firmware hex file which provide on st website and get same result.3.i try to upload source code from dSPIN Discovery Kit the LED works fine but the motor still not work. i checked power supply, source code work route and button response,everything but motor is ok.(sometimes the software will struck at line 335 at main.c which for checkflag signal)

Posted on July 24, 2015 at 04:17hii got a L6470H disc board and try to run the source code from (dSPIN_Firmware_Library_STM32) and (dSPIN Discovery Kit) project both of them get SPI communication fail: any read of spi get 0xFF, the board is new and all things(ulink, usb, motor power, motor) are plugged. anyone get any idea?

Posted on July 18, 2015 at 05:04What is the filter cap required for driving a stepper motor at 5 amps RMS? The schematic from ST shows 220uF 100V but no ESR data. I placed a United Chemi-Con 390uF 100V with an ESR of 28m ohms and a ripple current of 2.6 amps. I now trip the short circuit detect. Any rule of thumb? #l6482-filter-cap

Posted on June 22, 2015 at 16:05I've been encountering a strange problem.  I can use the L6474 to move a stepper motor pretty fast in the forward direction.  When I flip the direction bit though, I find that I can't make it move anywhere near as fast in the reverse direction.  Any idea what might be causing this?

Posted on June 30, 2015 at 15:58Running a bidirectional stepper at 30V with L6482 and getting actual stalls in 16-microstep mode -- under load the motor literally stops and hums, but nothing is reported back to software. It's like the driver has not detected it. We have been getting (apparently spurious) OC and UV errors with various settings, but we seem blind to this actual stall. How can we sense this to troubleshoot or at least halt and recover? #l6482-stall-detection-stop

Posted on June 10, 2015 at 10:16Can i interface a quadrature encoder to stm32 without using the channel 1,for example using the channel 2  and channel 3 .  

Posted on June 14, 2015 at 20:55Hello I am new to dSpin, but straight to the question.I have a L6470h setup on a protoboard using schematics found in the usermanual.But I see that the chip gets very hot even though it is in HiZ state. I measured the currency that my setup draws so I read ~26mA at HiZ, I have tried to different supply voltages 12V and 24V with both I get the same Iquiescence (but theres a difference in power consumption 0.31W and 0.62W). So as I believe the bridges are completely turned off so does almost all power go to heat? Are those current consumption values are adequate? P.S. I get these values without messing with any configurations straight after power up

Posted on June 30, 2015 at 16:04The manual describes the function of TBOOST well, but none of the examples of configurations that I have seen show the parameter set to anything besides 0x00, or really when it would be useful to implement it. Could someone comment on it? #tboost-turn-off-boost

Posted on June 09, 2015 at 19:01Hello,I just wanted to know the required current capacity for VH and VL for EVALSTGAP1S. I am using it fior SiC , VH=20V and VL = -5V.

Posted on March 11, 2015 at 10:54Hi, the application note DT0001 suggests controlling the motor speed by using the FWD/REV pin with a duty cycle. Though this sounds very promising especially for feed-back controller design I was wondering what happens if the motor is running in one direction and I force the motor to drive the other way. Isn't the motor than used in generator mode acting as a voltage source? Has anyone had experience with this usage and how is the L6235 reacting to it - where is the power burned? Thanks, Rasmus #brushless-speed-control #l6235 #dt0001

Posted on May 18, 2015 at 06:33HiI want to select a stepper motor for my project. I use L6470 IC drive.I�m new in motor working. I need a bipolar 2 phase stepper motor with minimum voltage 8 volt. Is it correct? Could you guide me in choosing a correct stepper motor?Yasamin Gharib #stepper-motor #l6470

Posted on June 05, 2015 at 16:53Hi,    We have a couple boards with Powerstep01 engineering preview ICs.   We can get the motor up and spinning, but we ran into a few issues.  First, the register address for CONFIG and STATUS do not match the current version of the datasheet. Is there any place we can download older version of the datasheet that would match the preview IC version.Second, we are using SYNC signal from the powerStep01. The number of pulses we get from SYNC signal is lower than the number of total of steps we should get if we order the motor to move faster than some speed. We already set FS_SPD to 0xFF.   What is odd is that if we power cycle the board, sometime, we actually get correct results. We captured all the register values when it was working and compare to when it was not working, and they are identical.  Can anyone tell us what might be the issue? Thank you,

Posted on May 26, 2015 at 13:40When the SW input to the L6470 chip is pulled LOW (by a switch closure or a LOW output from a logic circuit), is the ReleaseSW command the only way to move the motor?  Are all of the other constant speed commands, absolute positioning commands, and motion commands disabled until the SW input to the L6470 is raised? Thanks for your support. Charlie

Posted on May 28, 2015 at 14:12 Greetings, We are using this component in a board with a STM32F103CB with FOC firmware 4.0, the parameters code are generated via most recent Motor Control Workbench. The 6 PWM signals are well generated, and the L6230 is being powered with a 30 Volts. DC power line. VSA,VSB are correctly connected, as technical document suggested. VBOOT is well generated and VCP output shows a 10 V square signal of 616 Khz, that it is correct, according to technical doc. But the output at OUT1,OUT2 and OUT 3 reach a maximum of 3 Volts. Due to this the motor is not moving. Where is the problem? Any tip suggestion? Thanks in advance,

Posted on May 14, 2015 at 21:16How can i calculate the phase currents (ia, ib, ic) from the currents of the 3 shunt resistors placed under the lower switches of the inverter?like in steval-ihm023v3 #steval-ihm023v2

Posted on May 14, 2015 at 07:49Hello,I need a right SPI configuration and Send_Receive_byte() funtion for using with STM32F4, STM32CubeMX 4.7.0 and HAL drivers... Does anyone have it? I have a project running fine with STM32F4xx StdPeriph_Driver V1.2.0 to connect my STM32F4 and my L6482H chips. Now, I am trying to migrate my code, for using STM32 CubeMX v4.7.0 and HAL drivers. See below:void HAL_SPI_MspInit(SPI_HandleTypeDef* hspi) {   GPIO_InitTypeDef GPIO_InitStruct;   if(hspi->Instance==SPI1)   {     /* Peripheral clock enable */     __SPI1_CLK_ENABLE();       /**SPI1 GPIO Configuration         PA5     ------> SPI1_SCK     PA6     ------> SPI1_MISO     PA7     ------> SPI1_MOSI */     GPIO_InitStruct.Pin = GPIO_PIN_5|GPIO_PIN_6|GPIO_PIN_7;     GPIO_InitStru

Posted on May 19, 2015 at 09:25Hi, i am not sure if this is the correct forum, but i am searching for the libraries for the following products: L4984D STW62NM60N STTH3006DPI Are there any .lib available for LTSpice or PSpice and can you please post me the link to the .libs Thank you very much. Best Regards Jérôme

Posted on May 08, 2015 at 07:15Dear All,Thank You for your great support as always..I have the following clarifications, Tried to set STALL threshold using the AN2650 procedure, when the STALL threshold value is 00000000 STALL is not set, but when the value is 00000001 the STALL is set. For just a time period of 16us the stall is set.  The frequency of STEP input was 400 HZ and Full-Stepping mode was used. So, is there any other parameter which has to be taken care for proper stall threshold?Does stall threshold value setting should also consider the STEP input frequency?For change in STEP input frequency, the motor is not smooth and stops rotating. What is the reason for this? For Full-stepping, the motor is smooth only from 380 to 420 Hz and Micro-stepping does only when there is more than 1 KHz. When referred to the datasheet for STEP input details, only the minimum time period required is given. Is there anything else which should be taken care of?What is the proper way to st

Posted on April 29, 2015 at 14:06Hi, I am a student and i am trying to build a current sensing device using rogowski coil and STPM01. I am 'blind' to this project. I read on the datasheet that STPM01 can be used as a single chip monophase energy meter (standalone). What does it mean? Does it mean it does't have to connected to microcontroller all the time? If yes, how can I use and calibrate/program it? Can I use any kind of microcontroller such as Arduino? In standalone mode, which pin can show instantaneous/RMS current of the rogowski coil? What is the sensitivity of the input current channel? (the smallest voltage that can be sensed) I hope there are answers. Thank you. 

Posted on April 25, 2015 at 11:52HiI want to use to DfuSe tool for my application. I use L6470 stepper motor driver and STM32F107RC microcontroller in my board. My DfuSe tool is V3.0.4. I load firmware to the board by using the DfuSe demonstration software corresponding to UM1691.I use the “fwlibraries_V2_00_dspin_L6470H_DISC.dfu�? file from ST site. I attached the file to my e-mail. The firmware is downloaded on my board correctly and it is verified. I have two problems apparently.First a problem has in “select target�? part for SPI flash. I print screen the DfuSe tool window of my application and attached it to my e-mail.  In the “select target�? part of window, I have 1 sector instead of 128 sectors. Why?The second in “DFU mode version�?, I have version number 2200 instead of 0200 in page 23 of UM1691.Could you give me guidelines or solve my problem?I would like to know my hardware (STM32F107RC) has problem or not?Then I connected an 8 volt power to my motor power supply. My g

Posted on April 22, 2015 at 19:07The original post was too long to process during our migration. Please click on the attachment to read the original post.

Posted on April 16, 2015 at 16:16In application note AN4355, overcurrent detection page 18 and stall detection page 21, application note writes two equationsEquation 1: IOCDth = VOCDth � Rds(ON)Equation 2: ISTALLth = VSTALLth � Rds(ON)Why current is equal to voltage times resistance?should be use divide sign IOCDth = VOCDth � Rds(ON)How should I calculate overcurrent IOCDth ?for an instance, by default, IOCDth is 281.25mV, and external MOSFET Rds(ON) is 33m?, what is IOCDth equal to ?Thank you in advance #ocd #l6480h #stall-detection-l6470

Posted on April 10, 2015 at 11:52Hi there, I recently had a discussion on DT0001 motor control [DEAD LINK /public/STe2ecommunities/motordriver_ics/Lists/Motor%20Control%20Firmware%20and%20Software/Flat.aspx?RootFolder=/public/STe2ecommunities/motordriver_ics/Lists/Motor%20Control%20Firmware%20and%20Software/Speed%20Control%20according%20to%20DT0001&FolderCTID=0x01200200770978C69A1141439FE559EB459D758000CE106710FFA6574FB92BFFEFCE2DD930&TopicsView=https://my.st.com/public/STe2ecommunities/motordriver_ics/Lists/Motor%2520Control%2520Firmware%2520and%2520Software/AllItems.aspx&currentviews=19]here. In the end, since I am using the L6235 to drive the motor I was wondering whether this IC is able to handle current coming back from the motor when braking. Thanks, Rasmus #dt0001 #l6235