4X4 Driver Shield Manual
Contents
1. 3 31 2002 4X4 Driver Shield Manual High current high side switching for Arduino Logos Electromechanical Logos Electromechanical 4X4 Driver Shield Manual High current high side switching for Arduino Introduction The Logos Electromechanical ARD SRG IPS4X4 4X4 Driver Shield is designed to enable users to switch DC loads up to 5A at up to 30V with no heat sinking It uses four International Rectifier IPS6044 four channel fully protected high side MOSFET switch ICs Each includes over temp over current and under voltage protection on each E am a sales switch The high a side topology is safer in many applications than the more common ga o o a low side topology because a short to ground cannot RAR A odd a AA Sy QB QQ WH SS NAAA AM N WOOO NS OSS MMIII Ao Figure 1 Kit Contents while the switch is energize the circuit turned off as it can with a low side switch Each four channel chip has an independent power supply to allow the user maximum flexibility in configuring this board for their application The Arduino interface pins are arranged so that the shield can be driven with the hardware SPI bus This allows a much higher rates of data transfer to the shield or a 2012 Logos Electromechanical CC BY NC ND 3 0 Logos Electromechanical string of shield than is possible by bit banging the data It s fast enough to do fast high resolution PWM on large numbers of chan2. The DAT D4 jumper should be made on the board connected to the host Arduino in order to allow the host to receive the returned serial stream 10 e 2010 Logos Electromechanical amp CC BY NC ND 3 0 Stepper Motor Control Figure 6 Unipolar steppper wiring schematic desired Logos Electromechanical This shield can be used with some caution to control up to four unipolar stepper motors However the connection is a little different than the usual for conventional unipolar stepper motors Typically one connects the common lead s of the stepper motor to a power source and then switches the four coil terminals to ground in a pattern that moves the stepper motor as However the switches on this board are all high side switches That means that you have to flip the polarity of all of the coils and wire the common terminal to ground While this works with most unipolar stepper motors it cannot be guaranteed to work with any particular motor 11 o 2012 Logos Electromechanical 4 CC BY NC ND 3 0 Logos Electromechanical References Datasheet for 74HC595 shift registers http datasheet octopart com MM 74HC595MTC Fairchild datasheet 12735 pdf Datasheet for IPS6044GPBF http www irf com product info datasheets data 1ps6044g pdf Arduino Language Reference http arduino cc en Reference HomePage i The limiting factor on the number of boards that can be daisy chained off a sing
3. itches The following code will write the contents of lowByte and highByte to SO S7 and S8 S15 respectively digitalWrite 7 LOW Prepares latch digitalWrite 8 HIGH Deactivates master reset shiftOut 11 13 MSBFIRST highByte tt shift data tor QUIS QUTIS shiftOut 11 13 MSBFIRST lowByte shift data for OUTO OUT7 Se 2010 Logos Electromechanical 9 CC BY NC ND 3 0 Logos Electromechanical digitalWrite 7 HIGH AF Leech data On the last line all of the switches will switch at once The most significant bit of highByte will control OUT15 and the least significant bit will control OUT8 and likewise for 1owByte OUT7 and OUTO Daisy Chaining This shield is designed to be daisy chained in order to get greatly expanded numbers of high current outputs This requires a cable of the type shown in Figure 4 All of the pins are carried over with the exception of SIN amp SOUT pins 8 amp 7 respectively SOUT of the source shield must be connected to SIN of the next shield and so on down the chain Figure 4 Daisy chain cable schematic If you re using IDC connectors with ribbon cable to make your daisy chain cable this is straightforward Assemble the first connector normally At the second connector separate and swap conductors seven and eight After assembling the connector cut conductor seven now plugged into pin eight of the second connector downstream of the second connector and conduct
4. itches 4 7 VCC3 Power supple for switches 8 11 50 2012 Logos Electromechanical CC BY NC ND 3 0 Logos Electromechanical rower Wane meio Switch 8 16 Switch 9 17 OUT10 Switch 10 OUT11 Switch 11 Do VCC3 Power supple for switches 8 11 E A ME Ci E 23 Switch 14 A A A A A a Electrical Characteristics Table 4 Switch Electrical Characteristics Symbol Parameter a Te on Uia Relea pe LIN A Bl Mim Current Limit ss Limit AMA TT Operating Voltage V Op Range 28 e pep Go 2010 Logos Electromechanical amp CC BY NC ND 3 0 Logos Electromechanical Sob parameter LI Je 2012 Logos Electromechanical 9 CC BY NC ND 3 0 Logos Electromechanical Board Usage Electrical Connection The ideal connector to use is a high grade DB 25 with high quality crimp style socket terminals Solder style are also acceptable but less durable and more labor intensive to assemble correctly In both cases appropriate strain relief is crucial to reliability and durability A good quality backshell for the connector will come with appropriate strain relief components Figure 3 shows a schematic of a typical connection Figure 3 Typical power connection Software Interface This board is designed to work with the shi ftOut library function from the Arduino library Since this board includes two shift registers two calls are required in order to operate all of the sw
5. le Arduino is the fan out of the pins that drive the three inputs common to all devices in the chain SCK MR and LAT This can be expanded by adding a non inverting buffer to drive these pins out farther along the chain 2010 Logos Electromechanical CC BY NC ND 3 0
6. nels The PCB is made with generous traces to handle the current with minimal voltage loss and heating on the board A pair of 4AHCT595 8 bit shift registers allow the control of sixteen high current channels from only four Arduino pins using the shiftOut function The use of shift registers makes it possible to daisy chain as many as 25 boards off a single Arduino for a total of up to 400 high current channels In addition it can be daisy chained with all other Logos output boards with a shift register input i e those with a part number of the form SRG This board is shipped as a kit with none of the connectors soldered to the board This gives the user the flexibility to install the desired connectors for the application Board Overview Board Layout The switches are laid out around a vertical DB 25 to carry all of the high current signals The DB 25 was chosen due to its relatively high current capacity 5A pin long history 2 0 08 50000000 and the enormous range of types and LL ee grades the mating connectors are available in Fach of the four IPS6044 chips houses four channels Each IPS6044 draws its 70 al OL Y 090006m000000 Figure 2 Board Layout 2010 Logos Electromechanical CC BY NC ND 3 0 Logos Electromechanical power supply from a pair of pins on the main connector and switches it to four output pins on the same connector This arrangement allows the switching loads with different power
7. or eight now plugged into pin seven of the second connector upstream of the connector Assemble the third connector normally but after you have assembled it trim conductor eight downstream and conductor seven upstream Assemble the fourth connector as you did the second and the fifth as you did Qe 2012 Logos Electromechanical CC BY NC ND 3 0 Logos Electromechanical the third alternating for any additional connectors See Figure 5 for how it should look Connector 1is on the left end of the cable Figure 5 Daisy chain cable Certain other Logos Electromechanical parts also use shift registers compatible with this shield see the product page for which ones They will have expansion connectors compatible with the eight pin connector on this shield The daisy chain also contains the option to pass information from the daisy chain back to the controlling host This does nothing on this board except wrap the transmitted value back to the host but is included for compatibility with future planned boards There are two jumpers on the board that control this function one between the SOUT and DAT lines on the expansion connector and one between the DAT line and digital pin 4 on the Arduino In a project where no wrap around or feedback is desired both jumpers should be left open If feedback is desired the SOUT DAT jumper should be made on the last board in a chain in order to wrap the serial stream back to the return line
8. requirements on a single shield However each group must be arrange so that it draws no more than 10A continuous in order to avoid overloading the connector An anti parallel diode protects each switch allowing fast switching of large inductive loads without damage to the switches The expansion connector shift registers and associated resistors are located on the left side of the shield as seen in Figure 2 The shift registers are powered from the 5V logic supply of the host Arduino The board is shipped with the Arduino and expansion connectors provided but not installed in order to permit the user to to install the connectors most appropriate to their application Pin Descriptions Table 1 Arduino Pins Arduino Pin DAT Data Return Register Clock positive edge Master Reset active low Serial Clock positive edge Logic Ground Shorted to power ground 30 2012 Logos Electromechanical CC BY NC ND 3 0 Logos Electromechanical e DAT Data return This allows boards on a daisy chain to return data to the controlling Arduino Each shift register compatible shield has a jumper that allows this pin to be connected to the SOUT pin J FB1 or digital pin 4 J FB2 The last board in a chain must have this pin jumpered to SOUT in order to enable data return and the board mounted to the host Arduino must have this pin jumpered to digital 4 in order to allow the host to read the data e LAT A positive edge on
9. this pin latches the current contents of all of the the shift register to the outputs e MR Pulling the Master Reset low clears all of the shift registers e SCK A positive edge on this pin move the current value of the SIN pin to the least significant bit of the first shift register 1C1 and shifts every current bit in each shift register one bit up This is connected to the SCLK line of the hardware SPI bus on an Arduino Uno e SIN The value of this pin is shifted in to the least significant bit of the first shift register on each rising clock edge This is connected to the MOSI line of the hardware SPI bus on the Arduino Uno Table 2 Expansion Connector Pinout pat Pin ame Pane ai ponerse 2 9K Sitios Ground MR Master Reset active low DAT Data Return 4e 2010 Logos Electromechanical CC BY NC ND 3 0 Logos Electromechanical apa Pin Wane Fo O O OOOO o ur a O Serial Data Out to next board SIN Serial Data In from last board host e SCK SIN LAT MR DAT These pins work as described above e SOUT When a bit is shifted past the end of the second shift register 1C2 it appears on this pin This is what allows multiple shields to be daisy chained Table 3 Power Connector Pinout Common Ground Reference 0 IO Switch 2 Switch 1 Switch 0 Vea 0 Power supple for switches 0 3 8 VOI Power supple for switches 4 7 Switch 7 Switch 6 Switch 5 Switch 4 13 Power supple for sw
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