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january 2008 rev 2 1/34 AN1794 application note practispin evaluation system configuration and set up guide introduction practispin is an evaluation and demonstration system that can be used with several stmicroelectronics motor driv er integrated circuit device s. the system consists of a graphical user interface (gui) program which runs on an ibm-pc under windows, a common st7 based interface board that communicates with the pc and the practispin software via a serial comm port, and a device specific evaluation or target board that connects to the st7 interface board via a standard 34 pin ribbon cable interface, as shown in figure 1 . the target pcb connects to the motor or motors and to a user supplied dc power supply generally in the range of 12 to 48 vdc. the practispin system is designed to operate the device being evaluated (the target device) under control of the practispin software. dependi ng on which target device is being used, the practispin software can operate the device to drive a stepper motor, 1 or 2 dc motors or a brushless dc (bldc) motor. figure 1. system block diagram www.st.com
contents AN1794 2/34 contents 1 system overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.1 target board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.2 control interface board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 starting practispin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3 stepper motor drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3.1 constant speed mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3.2 indexing mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4 dc motor drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 4.1 dual dc motor control mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 5 bldc motor drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 5.1 bldc motor control mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6 eval6205n board configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 6.1 vref offset adjustment (r18) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 6.2 current scaling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 7 eval6206n board configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 7.1 vref offset adjustment (r18) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 7.2 current scaling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 8 eval6206pd board configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 8.1 vref offset adjustment (r18) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 8.2 current scaling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 9 eval6207n board configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 9.1 vref offset adjustment (r18) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 9.2 current scaling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 10 eval6208n board configur ation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 10.1 vref offset adjustment (r18) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
AN1794 contents 3/34 10.2 current scaling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 11 eval6208pd board configurat ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 11.1 vref offset adjustment (r18) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 11.2 current scaling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 12 eval6235 board configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 12.1 vref offset adjustment (r18) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 12.2 current scaling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 13 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
list of figures AN1794 4/34 list of figures figure 1. system block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 figure 2. st7 interface board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 figure 3. eval6205n schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 figure 4. eval6206 schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 figure 5. eval6206pd schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 figure 6. eval6207n schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 figure 7. eval6208n schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 figure 8. eval6208pd schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 figure 9. eval6235 schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
AN1794 system overview 5/34 1 system overview to illustrate the operation of the practispin system, we will look at one typical device supported by the system. the l6207 includes two independent full or h bridges with separate logic inputs and current control functions. the two bridges are designated a and b and their output pins designated as out1a, out2a, out1b, and out2b. these outputs are controlled independently by logic inputs in1a, in2a, in1b, and in2b respectively. a logic high or low on any of these inputs will drive its corresponding ou tput to the positive supply rail or to ground. both of the a outputs will be forced to an off (high im pedance) state if the ena pin is taken logic low, as will the b outputs if enb is taken low. the l6207 is thus controlled by six logic inputs: in1a, in2a, an d ena controlling bridge a and in1b, in2b, and enb controlling bridge b. each bridge also has an analog control signal, vrefa and vrefb, which control the current. 1.1 target board the l6207 target board gives access to the bridge a and b outputs at connectors cn3 and cn4 respectively. when driving a stepper motor, the two wires from one of the motor windings will connect to cn3 and the other winding will connect to cn4. swapping between the two connectors or swapping the polarity at a given connector will only reverse the sense of motor direction. dc supply power in the range of 12 to 48 vdc is connected at cn1. the polarity marked on the board silkscreen must be strictly observed! the eight control signals are taken from the 34- pin ribbon header (cn5) and are driven by the control interface pcb via a short flat cable. 1.2 control interface board the control interface pcb is based on an st72f264 microcontroller. the micro includes a uart and communicates with the practispin software via 9 pin d connector p1 employing a standard rs232 interface. the micro is based on flash memory and its firmware includes a write protected boot-loader routine that allows the practispin software to update or change the operating program in the st7 as required for different target boards. 5 vdc power for the board is received via the 34- pin ribbon cable from the target board or can be directly supplied at j2 if jumper wj1 is removed. the eight control signals for the target board are generated by the st7 micro. the six logic signals are generated directly by six of the eight pins of port b while the two analog current references (vrefa and vrefb) are generated by pulse width modulated (pwm) signals generated by the st7 along with an offset adjusting circuit controlled by potentiometer r18.
system overview AN1794 6/34 figure 2. st7 interface board
AN1794 starting practispin 7/34 2 starting practispin since the practispin system is capable of supporting several driver ic's and driving different types of motors the user must first select the type of motor to be driven and the driver ic that will be evaluated. 1. target board set up: configure the jumpers/switches on the target board and the st7 interface board as described in the paragraph for the specific evaluation board being used. 2. control board - pc connection: connect th e st7 interface board to a serial comm port of the pc via a standard (straight through) 9 pin d connector cable. 3. power up: energize the power supply. 4. start practispin software: on the pc, start the practispin program. 5. motor type selection: on the first screen of the practispin software, the user can select the appropriate type of moto r for the device under evalua tion. click on th e appropriate motor type. 6. communication settings: click the drop down list under "port selection" and select the comm port being used. baud rate and other communication parameters are fixed on both sides of the link and do not need to be set. 7. establish comm link: click the "connect with st7 hardware". at this point the practispin software will transmit several commands to the st7 to initialize the processor. the practispin software will read the revision code of the firmware currently stored in the flash memory of the st7 and determine if the correct version of firmware resides in the st7. if the practispin software detects that a firmware update is necessary, either because there is an old ve rsion of firmware or the firmware currently in the flash memory is not the correct firmware for the motor type selected, one or more dialogue boxes will appear asking if the pr ogram should proceed with the update. accept the updates an d the practispin software will autom atically update the firmware. the system will then in itialize the settings to the last stored settings and open the appropriate practispin software for the selected motor type. 8. calibrate current setting: when communication is established the user has the option to adjust the offset and maximum current settings. if this is the first time you use the system, calibration may be needed to adjust out the offset in the reference bias circuitry. calibration ensures that the reference voltage provided to l62xx ic follows the practispin software current settings. calibration is a two-step process; first the offset is adjusted then the maximum current is set. a) to null out the offset, click on calibrate zero then adjust r18 (on st7 board) until voltage at vref pin(s) of the l62xx device is zero. measurement points on each board are listed in the set up section for each target board. b) the maximum current, corresponding to 100% current setting in the practispin software, can be adjusted using the vref potentiometers on the target board. if the potentiometers are set to full scale (clockwise) the reference applied to the input of the device is typically about 0.88 v. th e full-scale peak current is equal to vref/rsense where rsense is the composite value of the sense resistor on the board. to set the maximum current, click on calibrate max and trim the vref potentiometer(s) on the eval62xx board to set the desired reference. if you plan to use microstepping, consider reducing the maximum vref to the real peak value you will use, allowing setting the software cu rrent controls near to 100%, avoiding poor vref resolution.
stepper motor drive AN1794 8/34 3 stepper motor drive after the system has established the connection to the interfac e board, it will initialize the settings to the last stored settings and open the appropriate gui for the selected motor type. for the stepper motor, the system can operate in either a constant speed or positioning (indexing) mode. the constant speed mode can easily be used to see that the system is working. 3.1 constant speed mode 1. speed control screen: a large blue button at the bottom of the screen should read, "switch to indexing mode". if the bu tton reads, "switch to speed control mode", click the button once to go to speed control mode. 2. stepping mode: in the stepping mode box, select either normal or half step. microstepping mode is only available when using the l6208. 3. device selection: in the device select ion box, select the device being evaluated. 4. direction: in the direction box, click the toggle switch to pick forward or reverse. this is somewhat arbitrary since we probably don't know what the direction sense of the motor will be. once the motor is running, toggle this switch to reverse t he motor direction if desired. to reverse the meaning of the forward and reverse designations, disable the motor (orange disable button at bottom of screen) and then swap the motor wires at either cn3 or cn4. 5. decay mode: only the l6208 allows the selection of fast or slow decay. set the toggle switch to slow decay. 6. accel rate: set the accel rate to about 1000 steps per second per second (steps/sec2). in the practispin system all motion parameters are given in terms of the basic units of steps and seconds: position in steps, velocity in step s/sec, and accel/decel in steps/sec2. in order to relate these settings to rotations, rpm, and rpm/second it is necessary to know the number of steps (or half steps) per rotation for the stepper motor being used. a common value is 200 steps or 400 half steps per rotation. 7. running speed: set running speed to about 100 steps/sec. 8. decel rate: set decel. rate to about 1000 steps/sec2. 9. accel current: set accel curren t to about 25%. this is an in itial guess as to the required setting and may need further adjustment. generally higher accel rate settings require higher accel current settings so that the stepper motor does not start to "slip poles" and fall behind the desired position. since we have initially set the acceleration rate setting quite low, 25% is probably adequate. 10. running current: set the running current to 25%. in practice the running current can often be set to a lower value than the accel current since the torque requirement is generally less during the constant speed part of the move. a lower running current setting can help to keep the device and the motor running cooler. 11. decel current: set the decel current to 25%. since friction aids in decelerating the motor it may also be possible to set the decel current lower. 12. holding current: set the holding current to 25%. whenever the motor is stopped (after a run,) this level of current will circulate in the motor so that it will hold position against any mechanical disturbance.
AN1794 stepper motor drive 9/34 in the case of a strong static load (perhaps a gravity load of some sort) it may be necessary to increase this setting. if not much holding torque is required, then the setting can be reduced so that operating temperatures can be held to a minimum. note: holding current will be turn ed off (bridge completely disabl ed) whenever the disable button is clicked. 13. run: make sure that the motor is free to turn in either direction and click the run button. the motor should quickly come up to speed ((100 steps/sec) / (1000 steps/sec2) = 0.1 sec.). to change the motor direction, click the direction toggle switch. if the motor does not run click the stop button, increase all four current settings to 50%, and click run button. if the motor still does not run an oscilloscope and cu rrent probe should be used to observe the motor current. 14. stop: click stop to stop the motor. after the basic operation of the system has been verified, the acceleration rates, top speed, and current settings can be adjusted to see how the motor responds. 3.2 indexing mode the system can be switched to operate in the positioning (indexing) mode by clicking on "switch to indexing mode". in the indexing mode a new box appears on the right of the screen. you can enter up to twelve indexed movements in the box and the wait time between each movement. when started, the software will execute each movement by accelerating up to the peak speed, moving the required number of steps and then decelerating back to a stop so that the total distance moved is the number of steps indicated, then wait the indicated time before starting the next movement. a negative number entered in the relative position will cause the motor to run in the "reverse" direction.
dc motor drive AN1794 10/34 4 dc motor drive after the system has established the connection to the interfac e board, it will initialize the settings to the last stored settings and open the appropriate practispin software for the selected motor type. for dc motor drive, the system operates in an open loop duty cycle control mode with cycle-by-cycle current limit. 4.1 dual dc motor control mode 1. direction: in the direction box for each motor, click the toggle switch to pick forward or reverse. this is somewhat arbitrary since we probably don't know what the direction sense of the motor will be. once the motor is running, toggle this switch to reverse the motor direction if desired. to reverse the meaning of the forward and reverse designations, disable the motor (orange disable button at bottom of screen) and then swap the motor wires at either cn3 or cn4. 2. braking: toggle the "brake when stop" switch to the off position for both motors. this will cause the motor to coast to rest when stopped, with the bridge placed in a high impedance state. if desired this function c an later be toggled on but some care should be exercised. braking will effectively sh ort out the motor ar mature through two transistors in the bridge, which could cause excessive current and power dissipation if the motor and load have a large moment of inertia (thus a large amount or stored mechanical to be dissipated) or the motor has a very low resistance (resulting in a large current flow). most smaller dc motors with several ohms of resistance do not pose a risk. 3. current: set the current for both motors to approximately 25%. this is an initial guess as to the required setting and may need further adjustment. 4. voltage: set the voltage for both motors to approximately 50%. 5. run: make sure that the motors are free to turn in either direction and click the run button. the motors should come up to approximately half of the speed that would be expected at this supply voltage. to change the motor direction, click the direction toggle switch. if the motors do not run click the stop button, increase both current settings to 50%, and click run button. if the motors still do not run an os cilloscope and current probe should be used to observe the motor current 6. stop: click stop to stop the motor. after the basic operation of the system has been verified, adjust voltage, current, direction and other parameters to evaluate the system.
AN1794 bldc motor drive 11/34 5 bldc motor drive after the system has established the connection to the interfac e board, it will initialize the settings to the last stored settings and open the appropriate practispin software for the selected motor type. for bldc motor drive, the system operates in an open loop duty cycle control mode with cycle-by-cycle current limit. 5.1 bldc motor control mode 1. direction: in the direction box for each motor, click the toggle switch to pick forward or reverse. this is somewhat arbitrary since we probably don't know what the direction sense of the motor will be. once the motor is running, toggle this switch to reverse the motor direction if desired. 2. braking: toggle the "brake when stop" s witch to the off positi on. this will cause the motor to coast to rest when stopped, with the bridge placed in a high impedance state. if desired this function can later be toggled on but some care should be exercised. braking will effectively short out the motor armature through thr ee transistors in the bridge, which could cause excessive current and power dissipation if the motor and load have a large moment of inertia (thus a large amount or stored mechanical to be dissipated) or the motor has a very low resistance (resulting in a large current flow). most smaller bldc motors with several ohms of resistance do not pose a risk. 3. current: set the current to approximately 25%. this is an initial guess as to the required setting and may need further adjustment. 4. voltage: set the voltage to approximately 50%. 5. run: make sure that the motor is free to turn in either direction and click the run button. the motor should come up to approximately half of the speed that would be expected at this supply voltage. to change the motor di rection, click the direct ion toggle switch. if the motor does not run click the stop button, increase the current settings to 50%, and click run button. if the motor still does not ru n an oscilloscope and current prob e should be used to observe the motor current. 6. stop: click stop to stop the motor. after the basic operation of the system has been verified, adjust voltage, current, direction and other parameters to evaluate the system.
eval6205n board configuration AN1794 12/34 6 eval6205n board configuration the schematic of the eval6205n board is shown in figure 3 . to use the eval6205n board with practispin system, the following configuration settings must be made on the eval6205n: 1. component updates: depending on the revision of the board, some or all of the following changes may be required (or desirable): a) to assure safe overcurrent operation: change c6 and c7 to 5.6 nf change r5 and r6 to 100 k ?. b) to assure an adequate 5 v supply, r2 may need to be changed. the minimum value for r2 is (vs-5)/(0.03+i) ? . where: vs is the supply voltage and i is any additional load placed on the 5 v supply (in amps). 2. jp1: place jp1 in the int position to enable the on-board 5 vdc supply. 3. jp2 and jp3: install jp2 and jp3 to assure proper timing operation of the l6205's internal high side overcurrent protection. 4. jp4 and jp5: install jp4 and jp5 to configure the vref circuits. 5. r17 & r21: adjust multi-turn trim pote ntiometers r17 and r2 1 fully clockwise. note: a slight click can be heard from the pot when it reaches its end of travel. 6. r23 adjust multi-turn trim pot r23 to the middle of its range. this pot sets the frequency of the cycle-bycycle current controller and can be fine tuned while observing the motor current on an oscillo scope or by simply adjusting to raise the frequency of the audible switching noise to an inaudible level if required. 7. motor connections: connect the motor coils at cn3 and cn4. when driving a stepper motor, one winding is connected to cn3 and the second winding is connected to cn4. for operation with 2 dc motors one motor is connected to each connector. 8. power supply: connect, but do not ener gize, a 12 to 48 vdc power supply at cn1 (positive to v in and negative to gnd). 9. using a 34 pin ribbon cable connect the eval6205n board to the control interface board. the two boards should be placed on the bench so that their 34 pin headers are side by side with the ribbon cable going straight across. set the following on the st7 interface board. 10. wj1: install wj1 on the st7 based control interface board. this allows 5 vdc power to be obtained from the target board. 11. jp1 and jp2 and r18: install the jp1 and jp2 jumpers to short the center and left pins together as shown in figure 2 . this is critical as excess ive motor current can result from misplacement of these jumpers! set potentiometer r18 to about 50%.
AN1794 eval6205n board configuration 13/34 figure 3. eval6205n schematic r11 _4 int6 c2 r22 r4 in2 cn 1 1 2 int0 in1 jp3 cn5 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 pullup vrefb in4 c6 _2 2 r18 vre f_b vre f_a touta1 p2.6 pullup r19 +5v r1 in4 tinb0 p2.1 cn 3 1 2 jp4 d1 d3 c9 _2 enb ocmpb1/icapb1 p4.3 3 r8 _4 c1 enb ext. gn d d2 r12 sense_b t outpb1 2.7 cw r16 c12 r3 cn 2 1 2 t ina1 p2 .4 in2 r9 li mi t_b pullup sense_a tina0 p2.0 vrefa r13 limit_a jp2 r10 c5 sen se_ a ocmpa1 p4.2 pullup r14 r15 int. vccref ena cw jp1 1 3 2 c8 in3 4 r17 c11 int2 _3 in1 r21 c7 u1 l6205 7 18 1 2 3 4 5 6 8 9 10 11 12 13 14 16 15 17 19 20 ou t1b ou t2a in1 in2 sensea ou t1a gnd gnd senseb in3 in4 enb vboot ou t2b vsb gnd gnd vsa vcp ena _3 sen se_ b int3 cw 1 u2 l6506dip 5 6 7 8 14 13 12 11 4 15 17 10 1 16 3 18 2 9 in1 in2 in 3 in 4 out1 out2 out3 out4 en vsense2 vref2 vsense1 r/c vref1 sync vcc osc_out gnd pullup r2 cn 4 1 2 c10 r20 c13 toutb0 p2.3 pullup _1 jp5 r6 r5 adc_ref in3 +5v r23 ena tinb1 p2.5 c4 r7 _1 li mi t_a pullup c3 limit_b
eval6205n board configuration AN1794 14/34 6.1 vref offset adjustment (r18) using a voltmeter monitor the voltage at jumper jp4 or jp5 the eval6205n board with respect to gnd (cn1) when calibrating the offset. 6.2 current scaling when potentiometers r17 and r21 are set full clockwise, a 100% current setting on the practispin software screen corresponds to a vref of approximately 0.88 vdc or a peak motor current of about 2.64 a. the peak current can be set to a lower value by adjusting r17 and r21. the reference voltage inputs can be monitored at jp4 and jp5.
AN1794 eval6206n board configuration 15/34 7 eval6206n board configuration the schematic of the eval6206n board is shown in figure 4 . to use the eval6206n board with practispin system, the following configuration settings must be made on the eval6206n: 1. component updates: depending on the revision of the board, some or all of the following changes may be required (or desirable): a) to assure safe overcurrent operation: ? change c6 and c7 to 5.6 nf ? change r5 and r6 to 100 k ? b) to assure an adequate 5 v supply, r2 may need to be changed. the minimum value for r2 is (vs-5)/(0.03+i) ? . where: vs is the supply voltage and i is any additional load placed on the 5 v supply (in amps). 2. jp1: place jp1 in the int position to enable the on-board 5 vdc supply. 3. jp2 and jp3: install jp2 and jp3 to enable the l6206's internal high side overcurrent protection. 4. jp4 and jp5: install jp4 and jp5 to set internal overcurrent threshold to maximum. if desired, these jumpers can be left out and the overcurrent levels may be set using potentiometers r7 and r8. 5. jp6 and jp7: install jp6 and jp7 to configure the vref circuits. 6. r20 and r26 adjust multi-turn trim pots r20 and r26 fully clockwise. note: a slight click can be heard from the pot when it reaches its end of travel. 7. r29: adjust multi-turn trim pot r29 to the middle of its range. this pot sets the chopping frequency of the l6506 current controller and can be fine tuned while observing the motor current on an oscilloscope or by simply adjust ing to raise the frequency of the audible switching noise to an inaudible level if required. 8. motor connections: connect the motor coils at cn3 and cn4. when driving a stepper motor, one winding is connected to cn3 and the second winding is connected to cn4. for operation with 2 dc motors one motor is connected to each connector. 9. power supply: connect, but do not ener gize, a 12 to 48 vdc power supply at cn1 (positive to v in and negative to gnd). 10. using a 34 pin ribbon cable connect the eval6205n board to the control interface board. the two boards should be placed on the bench so that their 34 pin headers are side by side with the ribbon cable going straight across. set the following on the st7 interface board. 11. wj1: install wj1 on the st7 based control interface board. this allows 5 vdc power to be obtained from the target board. 12. jp1 and jp2 and r18: install the jp1 and jp2 jumpers to short the center and left pins together as shown in figure 2 . this is critical as excess ive motor current can result from misplacement of these jumpers! set potentiometer r18 to about 50% .
eval6206n board configuration AN1794 16/34 figure 4. eval6206 schematic toutb0 p2.3 r9 r24 cn 2 1 2 cn 4 1 2 _3 ocdb r4 adc_ref _3 pullup tinb1 p2.5 c14 pullup c4 jp 2 ocda c5 int6 c7 4 r16 r14 r26 r23 vref _a _4 vrefa int0 jp 6 ena r20 r22 c12 ocda c8 gnd c15 cn 3 1 2 progclb r7 touta1 p2.6 _2 r18 r1 0 progclb sense_b vref _b 2 vrefb tinb0 p2.1 c9 r8 r13 _2 _1 ocmpb1/icapb1 p4.3 +5v c2 c6 u2 l6506dip 5 6 7 8 14 13 12 11 4 15 17 10 1 16 3 18 2 9 in1 in2 in3 in4 out1 out2 out3 out4 en vsen se2 vref2 vsense1 r/ c vref1 sync vcc osc_out gnd int. jp4 r17 pullup toutpb1 2.7 enb cw r2 jp 5 r27 cn 1 1 2 sense_a sense_a sense_b tina1 p2.4 ocdb jp 3 u1 l6 206 1 2 3 24 5 6 7 8 13 10 11 12 9 14 15 16 17 18 19 20 21 22 23 4 in1 in2 sensea progcla out1a gnd gnd out1b progclb senseb in3 in4 ocdb enb vboot out2b vsb gnd gnd vsa out2a vcp ena ocda in2 cw vccref c10 tina0 p2.0 r3 r5 pullu p jp 7 +5v d2 ocmpa1 p4.2 r1 enb cw r15 in4 in4 3 c13 cn 5 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 _4 d3 r25 r6 r12 r29 in1 ena pullup cw r21 c1 d1 jp1 1 3 2 int2 in2 pullup r1 1 r2 8 progcla in3 in1 int3 cw _1 pullup c11 r19 1 in3 c3 progcla ext.
AN1794 eval6206n board configuration 17/34 7.1 vref offset adjustment (r18) using a voltmeter monitor the voltage at jumper jp6 or jp7 the eval6206n board with respect to gnd (cn1) when calibrating the offset. 7.2 current scaling when potentiometers r20 and r26 are set full clockwise, a 100% current setting on the practispin software screen corresponds to a vref of approximately 0.88 vdc or a peak motor current of about 2.64 a. the peak current can be set to a lower value by adjusting r17 and r21. the reference voltage inputs can be monitored at jp6 and jp7.
eval6206pd board configuration AN1794 18/34 8 eval6206pd board configuration the schematic of the eval6206pd board is shown in figure 5 . to use the eval6206pd board with practispin system, the following configuration settings must be made on the eval6206pd: 1. component updates: depending on the revision of the board, some or all of the following changes may be required (or desirable): a) to assure safe overcurrent operation: ? change c6 and c7 to 5.6 nf ? change r4 and r5 to 100 k ? b) to assure an adequate 5 v supply, r1 may need to be changed. the minimum value for r1 is (vs-5)/(0.03+i) ? . where: vs is the supply voltage and i is any additional load placed on the 5 v supply (in amps). 2. jp1: place jp1 in the int position to enable the on-board 5 vdc supply. 3. jp2 and jp3: install jp2 and jp3 to enable the l6206's internal high side overcurrent protection. 4. jp4 and jp5: install jp4 and jp5 to set internal overcurrent threshold to maximum. if desired, these jumpers can be left out and the overcurrent levels may be set using potentiometers r6 and r7. 5. r16 and r22: adjust multi-turn trim pots r16 and r22 fully clockwise. note: a slight click can be heard from the pot when it reaches its end of travel. 6. r25 adjust multi-turn trim pot r25 to the middle of its range. this pot sets the chopping frequency of the l6506 current controller and can be fine tuned while observing the motor current on an oscilloscope or by simply adjust ing to raise the frequency of the audible switching noise to an inaudible level if required. 7. motor connections: connect the motor coils at cn3 and cn4. when driving a stepper motor, one winding is connected to cn3 and the second winding is connected to cn4. for operation with 2 dc motors one motor is connected to each connector. 8. power supply: connect, but do not ener gize, a 12 to 48 vdc power supply at cn1 (positive to v in and negative to gnd). 9. using a 34 pin ribbon cable connect the eval6205n board to the control interface board. the two boards should be placed on the bench so that their 34 pin headers are side by side with the ribbon cable going straight across. set the following on the st7 interface board wj1: install wj1 on the st7 based control interface board. this allows 5 vdc power to be obtained from the target board. jp1 and jp2 and r18: install the jp1 and jp2 jumpers to short the center and left pins together as shown in figure 2 . this is critical as excess ive motor current can result from misplacement of these jumpers! set potentiometer r18 to about 50%.
AN1794 eval6206pd board configuration 19/34 figure 5. eval6206pd schematic r2 4 cn 4 1 2 c6 c3 cn 1 1 2 tina1 p2.4 r7 progcla vref_a _4 _2 in2 sense_a r9 jp5 ena tina0 p2.0 ocda c11 r1 r1 9 r4 c13 cw r6 c14 ocmpa1 p4.2 r14 progclb a0in6 p7.6 cw _2 ext. r18 r2 1 vref_b vrefa int2 c12 ocdb progclb r2 0 _1 vccref r11 int. toutb0 p2.3 r5 r1 7 c2 pullup d1 1 3 2 r15 tinb1 p2.5 r22 pullup sense_a enb cn 2 1 2 sense_b l6206pd jp4 sense_a sense_b in3 vrefb int6 jp2 enb c1 cw pullup int3 pullu p jp3 r26 pullup int0 r2 cn 3 1 2 r13 in1 touta1 p2.6 cw r16 adc_ref c15 in4 r3 in1 _4 pullup c9 ena tinb0 p2.1 pullup cw c8 in2 r12 c5 _1 r10 c10 +5v in3 ocda ocmpb1/icapb1 p4.3 +5v cn 5 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 sense_b c4 progcla in4 _3 r25 jp 1 1 3 2 ocdb a1in6 p8.1 d2 _3 u2 5 6 7 8 16 15 14 13 4 17 19 12 1 18 3 20 2 9 10 11 in1 in2 in3 in4 out1 out2 out3 out4 en vsense2 vref2 vsense1 r/c vref1 sync vcc osc_out gnd nc nc u1 36 10 1 12 30 11 18 33 19 9 26 4 7 28 29 8 27 24 13 15 25 22 5 32 2 3 6 14 16 17 20 21 23 31 34 35 gnd in1 gnd sensea vboot in2 gnd vsb gnd p rogcla in3 vsa vcp p rogclb enb ena in4 ocdb ocda out1a senseb out1b out2a out2b nc nc nc nc nc nc nc nc nc nc nc nc toutpb1 2.7 stmicroelectronics industrial&power supply application lab c7 r8 r23
eval6206pd board configuration AN1794 20/34 8.1 vref offset adjustment (r18) using a voltmeter monitor the voltage at the junction of r12 and r16 or the junction of r20 and r22 on the eval626pd board with respect to gnd (cn1) when calibrating the offset. 8.2 current scaling when potentiometers r16 and r22 are set full clockwise, a 100% current setting on the practispin software screen corresponds to a vref of approximately 0.88 vdc or a peak motor current of about 4.4 a. the peak current can be set to a lower value by adjusting r16 and r22.
AN1794 eval6207n board configuration 21/34 9 eval6207n board configuration the schematic of the eval6207n board is shown in figure 6 . to use the eval6207n board with practispin system, the following configuration settings must be made on the eval6207n: 1. component updates: depending on the revision of the board, some or all of the following changes may be required (or desirable): a) to assure safe overcurrent operation: ? change c6 and c7 to 5.6 nf ? change r3 and r4 to 100 k ? b) to assure an adequate 5 v supply, r2 may need to be changed. the minimum value for r2 is (vs-5)/(0.03+i) ? . where: vs is the supply voltage and i is any additional load placed on the 5 v supply (in amps). 2. jp1: place jp1 in the int position to enable the on-board 5 vdc supply. 3. jp2 and jp3: install jp2 and jp3 to assure proper timing operation of the l6207's internal high side overcurrent protection. 4. r15 and r18: adjust multi-turn trim pots r15 and r18 fully clockwise. note: a slight click can be heard from the pot when it reaches its end of travel. 5. r6 and r7: adjust multi-turn trim pots r6 and r7 to the middle of their range. these pots set the off time of the cycle by cycle current controller and can be fine tuned while observing the motor current on an oscilloscope or by simply adjusting to raise the frequency of the audible switching noise to an inaudible level if required. 6. motor connections: connect the motor coils at cn3 and cn4. when driving a stepper motor, one winding is connected to cn3 and the second winding is connected to cn4. for operation with 2 dc motors one motor is connected to each connector. 7. power supply: connect, but do not ener gize, a 12 to 48 vdc power supply at cn1 (positive to v in and negative to gnd). 8. using a 34 pin ribbon cable connect the eval6207n board to the control interface board. the two boards should be placed on th e bench so that their 34 pin headers are side by side with the ribbon cable going straight across. set the following on the st7 interface board 9. wj1: install wj1 on the st7 based control interface board. this allows 5 vdc power to be obtained from the target board. 10. jp1 and jp2 and r18: install the jp1 and jp2 jumpers to short the center and left pins together as shown in figure 2 . this is critical as excess ive motor current can result from misplacement of these jumpers! set potentiometer r18 to about 50%.
eval6207n board configuration AN1794 22/34 figure 6. eval6207n schematic r2 l6207 pullup c4 adc_r ef vre fb vccref ena limit_a gnd in1 in2 r1 1 r15 c10 r1 3 limitb c8 ocmpa 0/icapa0 p3.2 cw c5 enb vre f b a0in6 p7.6 jp 2 limit_b r6 r8 in2 sense_a r14 in3 u1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 in1a in2a sensea rca/inh out1a gnd gnd out1b rcb senseb in1b in2b vref b enb vboot out2b vsb gnd gnd vsa out2a vcp ena vre f a c6 ocmpa 1 p4.2 r7 d3 pullup r1 cn 1 1 2 cn4 1 2 cw vccref d1 limit_a int0 r5 rc a /i nh vre f a cn 5 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 cw pullup int2 sensea d2 in3 tinpa o p2.0 c7 in4 c2 vre f_a ext. c3 touta 1 p2.6 enb ena c1 r1 8 li mi t_b r12 toutb 1 p2.7 r3 int. in1 jp 1 1 3 2 r9 +5 v jp 3 touta o p2.2 limita cn 2 1 2 c1 1 vre f_b rca/inh +5 v cn3 1 2 c9 limit_b a1in6 p8.1 in4 senseb r1 6 r1 7 li mi t_a ocmpb 0 p3.3 ocmpb 1/icapb1 p4.3 r4 vre fa sense_b r10 tinpb 0 p2.1
AN1794 eval6207n board configuration 23/34 9.1 vref offset adjustment (r18) using a voltmeter monitor the voltage at the vrefa or vrefb test point on the eval6207n board with respect to gnd (cn1) when calibrating the offset. 9.2 current scaling when potentiometers r20 and r26 are set full clockwise, a 100% current setting on the practispin software screen corresponds to a vref of approximately 0.88 vdc or a peak motor current of about 2.64 a. the peak current can be set to a lower value by adjusting r15 and r18. the reference voltage inputs can be monitored at the vrefa or vrefb test point.
eval6208n board configuration AN1794 24/34 10 eval6208n board configuration the schematic of the eval6208n board is shown in figure 7 . to use the eval6208n board with practispin system, the following configuration settings must be made on the eval620a: 1. component updates: depending on the revision of the board, some or all of the following changes may be required (or desirable): a) to assure safe overcurrent operation: ? change c6 to 5.6 nf ? change r9 to 100 k ? b) to assure an adequate 5 v supply, r2 may need to be changed. the minimum value for r2 is (vs-5)/(0.03+i) ? . where: vs is the supply voltage and i is any additional load placed on the 5 v supply (in amps). 2. jp1: place jp1 in the int position to enable the on-board 5 vdc supply. 3. switches place all four of the switches in the right (toward the l6208) position. 4. r20 and r24: adjust multi-turn trim pots r20 and r24 fully clockwise. note: a slight click can be heard from the pot when it reaches its end of travel. 5. r11 and r12: adjust multi-turn trim pots r11 and r12 to the middle of their range. these pots set the off time of the cycle by cycle current controller an d can be fine tuned while observing the motor curren t on an oscilloscope or by si mply adjusting to raise the frequency of the audible switching noise to an inaudible level if required. 6. motor connections: connect the motor coils at cn3 and cn4. when driving a stepper motor, one winding is connected to cn3 and the second winding is connected to cn4. for operation with 2 dc motors one motor is connected to each connector. 7. power supply: connect, but do not ener gize, a 12 to 48 vdc power supply at cn1 (positive to v in and negative to gnd). 8. using a 34 pin ribbon cable connect the eval6208n board to the control interface board. the two boards should be placed on th e bench so that their 34 pin headers are side by side with the ribbon cable going straight across. set the following on the st7 interface board. 9. wj1: install wj1 on the st7 based control interface board. this allows 5 vdc power to be obtained from the target board. 10. jp1 and jp2 and r18: install the jp1 and jp2 jumpers to short the center and left pins together as shown in figure 2 . this is critical as excess ive motor current can result from misplacement of these jumpers! set potentiometer r18 to about 50%.
AN1794 eval6208n board configuration 25/34 figure 7. eval6208n schematic pullup r1 0 int. cw r2 cl ock vrefa cw / ccw en r14 vref b r19 r9 c6 d2 r12 r3 en cw gnd pullup c2 cn 1 1 2 vrefb pullup s1 9 11 16 8 1 15 10 14 2 13 3 12 4 5 6 7 cn 4 1 2 di ag cn 5 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 r4 control pullup r5 cl oc k c4 rc a cw r1 r21 cw / ccw c9 reset r15 c7 cl oc k cloc k fast r7 vccref pullup c1 r2 0 slow d1 jp1 1 3 2 di ag rca +5v cn 2 1 2 cw vrefa full r17 di ag co n trol c5 ha l f /f ul l d3 r1 1 vrefb half r22 r8 r2 4 c8 rcb l6208n r6 c1 0 r1 3 u1 3 4 1 9 13 24 2 11 10 14 23 12 5 6 7 8 15 16 17 18 19 20 21 22 sensea rca cloc k rcb control vref a cw / ccw vrefb senseb en reset half /full out1a gn d gn d out1b vboot out2b vsb gn d gn d vsa out2a vcp cn 3 1 2 vref a half /full ext. r16 en cw r18 pullup +5v reset ccw rc a pullup c3
eval6208n board configuration AN1794 26/34 10.1 vref offset adjustment (r18) using a voltmeter monitor the voltage at the vrefa or vrefb test point on the eval6208n board with respect to gnd (cn1) when calibrating the offset. 10.2 current scaling when potentiometers r20 and r21 are set full clockwise, a 100% current setting on the practispin software screen corresponds to a vref of approximately 0.88 vdc or a peak motor current of about 2.64 a. the peak current can be set to a lower value by adjusting r15 and r18. the reference voltage inputs can be monitored at the vrefa or vrefb test point after tube recognition the micr ocontroller will set th e right run frequency for the connected lamp.
AN1794 eval6208pd board configuration 27/34 11 eval6208pd board configuration the schematic of the eval6208pd board is shown in figure 8 . to use the eval6208pd board with practispin system, the following configuration settings must be made on the eval6208pd: 1. component updates: depending on the revision of the board, some or all of the following changes may be required (or desirable): a) to assure safe overcurrent operation: ? change c12 to 5.6 nf ? change r21 to 100 k ? b) to assure an adequate 5 v supply, r1 may need to be changed. the minimum value for r1 is (vs-5)/(0.03+i) ? . where: vs is the supply voltage and i is any additional load placed on the 5 v supply (in amps). 2. jp1: place jp1 in the int position to enable the on-board 5 vdc supply. 3. switches: place all four of the switches in the right (toward the l6208) position. 4. r8 and r17: adjust multi-turn tr im pots r8 and r17 fully clockwise. note: a slight click can be heard from the pot when it reaches its end of travel. 5. r10 and r11: adjust multi-turn trim pots r10 and r11 to the middle of their range. these pots set the off time of the cycle by cycle current controller an d can be fine tuned while observing the motor curren t on an oscilloscope or by si mply adjusting to raise the frequency of the audible switching noise to an inaudible level if required. 6. motor connections: connect the motor coils at cn3 and cn4. when driving a stepper motor, one winding is connected to cn3 and the second winding is connected to cn4. for operation with 2 dc motors one motor is connected to each connector. 7. power supply: connect, but do not ener gize, a 12 to 48 vdc power supply at cn1 (positive to v in and negative to gnd). 8. using a 34 pin ribbon cable connect the eval6208pd board to the control interface board. the two boards should be placed on the bench so that their 34 pin headers are side by side with the ribbon cable going straight across. set the following on the st7 interface board. 9. wj1: install wj1 on the st7 based control interface board. this allows 5 vdc power to be obtained from the target board. 10. jp1 and jp2 and r18: install the jp1 and jp2 jumpers to short the center and left pins together as shown in figure 2 . this is critical as excess ive motor current can result from misplacement of these jumpers! set potentiometer r18 to about 50%.
eval6208pd board configuration AN1794 28/34 figure 8. eval6208pd schematic full r1 9 touta 1 p2.6 slow pullup vre f a r1 6 r1 0 +5v cw / cc w tinb1 p2.5 sensea rca vrefb vref_a cw/ cc w ocmpa 1 p4.2 fast cw c6 d1 1 3 2 touta 0 p2.2 r2 res et cn 5 con34a 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 tina0 p2.0 cn4 1 2 pul lup r5 adc_r ef c1 2 r9 c9 co n tro l cw en pul lup vre f b r2 1 r7 c2 r4 vrefa cw c5 r6 c3 r1 1 ccw cn1 1 2 vin s1 9 11 16 8 1 15 10 14 2 13 3 12 4 5 6 7 half cl ock +5v r1 3 vref_b tina1 p2.4 r8 c4 c1 con trol toutb1 p2.7 ext. hal f/ ful l cw r3 gnd d2 pullup int. r1 pullup pu ll up senseb u1 1 10 36 12 30 28 18 33 19 11 13 4 7 9 29 24 27 8 26 15 25 22 5 32 2 3 6 14 16 17 20 21 23 31 34 35 gnd cl ock gnd sensea vboot con trol gnd vsb gnd cw/ ccw rca vsa vcp vref a en rc b hal f/ ful l res et vrefb out1a senseb out1b out2a out2b nc nc nc nc nc nc nc nc nc nc nc nc rc a en diag ocmpb1/icapb1 p4.3 cl ock c8 en jp 1 jumper 3x1 1 3 2 r1 4 toutb 0 p2.3 r1 2 r1 7 cl ock cn3 1 2 c7 cw cn2 1 2 res et stmic roelectr onics industria l&power supply ap plicatio n lab r1 8 r2 0 cl ock pullup vccref r1 5 hal f/ ful l di ag l6208pd
AN1794 eval6208pd board configuration 29/34 11.1 vref offset adjustment (r18) using a voltmeter monitor the voltage at the vrefa or vrefb test point on the eval6208pd board with respect to gnd (cn1) when calibrating the offset. 11.2 current scaling when potentiometers r8 and r17 are set full clockwise, a 100% current setting on the practispin software screen corresponds to a vref of approximately 0.88 vdc or a peak motor current of about 4.4 a. the peak current can be set to a lower value by adjusting r15 and r18. the reference voltage inputs can be monitored at the vrefa or vrefb test point.
eval6235 board configuration AN1794 30/34 12 eval6235 board configuration the schematic of the eval6235 board is shown in figure 9 . to use the eval6235 board with practispin system, the following configuration settings must be made on the eval6235: 1. component updates: depending on the revision of the board, some or all of the following changes may be required (or desirable): a) to assure safe overcurrent operation: ? change c6 and c7 to 5.6 nf ? change r6 to 100 k ? and remove r2 b) to assure an adequate 5 v supply, r1 may need to be changed. the minimum value for r1 is (vs-5)/(0.03+i) ? . where: vs is the supply voltage and i is any additional load (such as hall sensors) placed on the5 v supply (in amps). 2. jp1 and jp2: install jp1 and jp2 to enable the on-board 5 vdc supply. 3. switches: place all four switches in the down (away from u2) position. 4. r22: adjust multi-turn trim pot r22 fully clockwise. note: a slight click can be heard from the pot when it reaches its end of travel. 5. r10: adjust multi-turn pot r10 to the middle of its range. this pot sets the off time of the cycle by cycle current controller and can be fine tuned while observing the motor current on an oscilloscope or by simply adju sting to raise the frequency of the audible switching noise to an inaudible level if required. 6. hall sensors: connect the hall sensors of the bldc motor at cn5. connect the power supply wires from the hall sensors at pins gnd and p5v. hall sensors are notorious for being destroyed by reversed polarity! know, don't guess, the proper polarity! connect h1, h2, and h3 signals to their respective pins. 7. motor connections: connect the three motor armature wires at cn3 being careful to match the phasing to the hall sensor connections. please refer to the l6235 data sheet for a description of the proper phase relationship between the motor phases and the hall sensors. note: there are six possible ways to connect the three armature wires to cn3. while only one connection will give proper pe rformance, one or two of th e other possible connection may cause the motor to turn but with very poor performance and, perhaps, high motor currents even if the system is unloaded. 8. power supply: connect, but do not ener gize, a 12 to 48 vdc power supply at cn1 (positive to v in and negative to gnd). 9. using a 34 pin ribbon cable connect the eval6208pd board to the control interface board. the two boards should be placed on the bench so that their 34 pin headers are side by side with the ribbon cable going straight across. set the following on the st7 interface board. 10. wj1: install wj1 on the st7 based control interface board. this allows 5 vdc power to be obtained from the target board. 11. jp1 and jp2 and r18: install the jp1 and jp2 jumpers to short the center and left pins together. this is critical as excessive motor current can result from misplacement of these jumpers! set potentiometer r18 to about 50%.
AN1794 eval6235 board configuration 31/34 figure 9. eval6235 schematic r2 tp enable a0in6 p7.6 r5 h3 adc_r ef h1 pullup vref cw r7 c5 r1 2 c9 r4 sense p2 .6 s1 9 11 16 8 1 15 10 14 2 13 3 12 4 5 6 7 p3.1 r21 c3 p2 .1 ocmpa 1 p4.2 vref vccref c1 r6 u1 l6235 5 3 16 4 21 8 1 2 9 13 23 11 10 14 24 12 6 7 15 17 18 19 20 22 out 1 sense1 out 3 r coff out 2 t acho h1 di ag rcpul se vr ef h2 f wr/ rew sense2 br ake h3 en able gnd g nd vb oo t vsb g nd gnd vsa vc p brake cn1 1 2 frw/rew in t2 + - u2b lm358 5 6 7 8 4 pul lup h2 c8 c10 in t3 tp c12 r1 p2 .2 c11 r1 3 +5v pullup d3 fw r9 +5 v h1 +5v h1 tina0 p2.0 cn4 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 rev l6235 cw r17 h3 r11 r16 r22 p2 .4 brake tp c6 cn3 1 2 3 c7 rc/inh +5 v hall con cw c2 r3 enabl e diag cn2 1 2 p2 .5 pullup r10 r 14 brake h2 d1 r19 p2 .7 r8 +5v vc cr ef en h1 r15 diag + - u2a lm358 3 2 1 8 4 pul lup trq c4 h2 r18 r20 jp2 h3 d2 cn5 1 2 3 4 5 jp1 frw/rev speed
eval6235 board configuration AN1794 32/34 12.1 vref offset adjustment (r18) using a voltmeter monitor the voltage at the junction of r17 and r20 on the eval6235n board with respect to gnd (cn1) when calibrating the offset. 12.2 current scaling when potentiometer r22 is set full clockwise, a 100% current setting on the practispin software screen corresponds to a vref of approximately 0.88 vdc or a peak motor current of about 4.4 a. the peak current can be set to a lower value by adjusting r22. the reference voltage inputs can be monitored at the junction of r17 and r20.
AN1794 revision history 33/34 13 revision history table 1. document revision history date revision changes 21-jun-2004 1 initial release 29-jan-2008 2 document reformatted. no content change
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