Mick`s uMite PCB (MuP) Ver. 2
Contents
1. convenient to use J 2 or J 12 as the entry point for the power supply as well A classic example is when using a USB Serial Cable similar to this unit available from DONTRONICS COM http www dontronics shop com ftdi usb to serial ttl level 3 3v converter cable html See APPENDIX A at the end of this document for more details on this cable J 2 and J 12 may be used to supply 5V to the MuP if no other supply is connected to 3 1 have provided an isolation jumper J 13 to connect or disconnect the 5V supply from 2 and J 12 J2 may also be used to supply 3v3 power there is no connection for 3v3 on J 12 but care should be taken that there are no other power sources and that none of the Vregs VR1 3 are fitted this is NOT my preferred option for powering the MuP 3 Power This is primarily a power inlet or outlet port NOTE DoNOT connect 3v3 from an external source If any of the Voltage Regs VR1 VR3 are fitted O1 lt OF lt IiPp O i Z a U J3 4 J 5 Pictures not shown but are direct connections to the adjacent pins of the Pic32mx150 chip with the one exception of J 5 pin 6 would equate to Pic pin 20 as Pic pin 20 Is the ve for the cap at Cl and should have no other connections to it so this pin is connected to Gnd instead These are the main connection points for interfacing to the outside world Solder Male or Female headers to these position as suits your application J6 J 7 J8 These2. By Mick Gulovsen 17 May 2014 Ver 3 Mick s uMite PCB MuP Ver 2 J9 TTL Rx level ON 3v3 OFF 5v J1 ICSP J12 TTL Console To suit Whitewizard and Sparkfun USB TTL aX Y J A V olol EE J k PUD j F lt e dl 4 K nas WEYRID yoag Ag ayn Bd B E oa fe Ee Ee Ee e J2 TTL Console Main Port Jr E lt J gt lt O Q Q3 lt OO po lt 12 I3 gt ee Ss kez h a g J13 5V Power From J2 or J12 ON Enable OFF Disable I2C Pullups ON Enable OFF Disable J4 J5 Main I O Connections to the real world J3 Power Input or Output J6 J7 J8 I2C Connection Bus And Voltage Selector for I2C Board Concept Full hardware design for the MicroMite uMite project can be found here http geoff g net micromite htm The Mick uMite PCB from here on called MuP was originally designed for my own purposes as a final stage PCB after a project has been developed on a prototype or bread Vero board Two great fully optioned uMite PCBs can be found on the Back Shed Forums designed by W hiteW izard 44pin proto and Zonker a 28pin proto both of these PCBs are well designed and have on board USB to TTL interfaces to facilitate communication with a PC Further information can be found in the forums located here Zonker s 28pin htt p www thebackshed com f
3. DATA OUT CONSOLE Rx DATA IN POWER 42 3 to 8 6V SPI IN 5V DIGITAL The notation is as follows the mnemonic in brackets is the mode used inthe SETPI N command ANALOG DI GI TAL INT COUNT 5V COM xxx C xxx SPI xxx PWM xxx R WAKEUP These pins can be used to measure voltage AIN Can be used for digital O such as digital input DI N digital output DOUT and open collector output OOUT Can be used to generate an interrupt INTH INTL and I NTB Can be used to measure frequency FI N period PI N or counting CI N These pins can be connected to 5V circuits All other 1 0 pins are strictly 3 3V maximum These are used for serial communications see Appendix A These are used for 1 C communications see Appendix B If SPI is enabled these pins will be used for SPI 1 0 see Appendix D PWM or SERVO output see the PWM and SERVO commands This can be used to receive signals from an infrared remote control see the I R command This pin can be used to wake the CPU froma sleep see the CPU SLEEP command Build Options Power MuP has provision for an on board 3v3 Regulator so only needs to be supplied with 5Vdc whilst have allowed an option of 3 types of 3v3 Regulators for MuP ONLY ONE should ever be installed otherwise they would work against each other and possibly oscillate affecting the quality of the 3v3 rail If you wish MuP can be powered via a USB TTL adapter that has a 3v3 o
4. Ik for 190kH21 C 2k tor 40OKH Dk for 100KH2 17C 2k for 400KH2 Ul PI C32MX150F128B 1 SP Main CPU R1 R2 R3 R5 R7 LD1117V33 T0220 3v3 Voltage Regulator ONLY one Vreg to be installed LM1117 SOT 223 3v3 Voltage Regulator ONLY one Vreg to be installed MCP1702 3v3 Voltage Regulator ONLY one Vreg to be installed VR2 VR3 28 Pin Micromite Connections reprinted with kind permission by Geoff Graham The following diagram shows the possible functions of each I O pin on the Micromite Note that the physical pins on the chip and the pin numbers used in MMBasic are the same This means that nine pins are not available in MMBasic as they are dedicated to functions such as power and ground These pins are highlighted in grey in the diagram RESET Wired to directly or via 10K resist SPI OUT PWM 1A PWM 1B PWM 1C COM1 ENABLE COM2 TRANSMIT INT DIGITAL COM2 RECEIVE INT DIGITAL 1 ANALOG POWER 22 3 to 8 6V DIGITAL INT ANALOG 2 ANALOG GROUND DIGITAL INT ANALOG 73 ANALOG DIGITAL PWM 2A DIGITAL INT ANALOG 4 ANALOG DIGITAL SPI CLOCK DIGITAL INT ANALOG 5 ANALOG DIGITAL PWM 2B DIGITAL INT ANALOG 6 ANALOG DIGITAL DIGITAL INT ANALOG 7 DIGITAL 5V COM1 RECEIVE GROUND 8 DIGITAL 5V COM1 TRANSMIT 9 47uF TANT CAPACITOR 4 GROUND DIGITAL 5V COUNT 1 C DATA DIGITAL 5V COUNT 12C CLOCK DIGITAL 5V COUNT WAKEUP IR DIGITAL 5V COUNT CONSOLE Tx
5. are designed for use with 7C devices The left hand column 4 vertical pins of J 6 all connect to the Data for C communication The right hand column 4 vertical pins of J 6 all connect to the Clock for C communication The left hand column 4 vertical pins of J 7 all connect to 3v3 or 5V depending on J 8 setting The right hand column 4 vertical pins of J 7 all connect Gnd J 8 is for a jumper to select if the left hand column of pins of J 7 are 5V link pin 1 amp 2 or 3v3 link pin 2 amp 3 This allows up to four 7C devices to be easily connected to the MuP via a4 pin header to pick up the Dat Clk Power Gnd signals d Dat Clk 3 5v Gnd Console Rx in 9 amp R5 The TTL console Interface J 2 Rx is connected to Pin 12 of the PI C32 chip This pinis NOT 5V tolerant and needs a lk Ohm resistor between J 2 pin Rx and U1 pin 12 This enables a 5V TTL USB to TTL serial input to directly connect without risking the Pic32 s input circuitry have provided for this resistor R5 and an associated J umper block J 9 If you wish to use a USB to Serial adapter designed for 3v3 TTL levels Then J 9 should have a jumper link fitted if using a 5V TTL level input you will need to REMOVE the link onJ 9 C Pullups R6 R7 amp 10 11 have provided for the provision of pull up resistors for the C headers on the MuP these would not normally be fitted if you are using Pin 17 or Pin 18 for other pur
6. izard s USB module Sparkfun has aUSB TTL module that could be used here but it has only 4 pins J 12 iS a5 pin header and is missing the 5V so cannot supply power to MuP V2 Further information can be found at www sparkfun com 5 Added aJ umper J 13 to enable or disable 5V from the USB TTL module inputs J 2 amp J 12 1f MuP V2 is being supplied power through J 3 AND aUSB TTL cable or adapter that has a 5V supply is connected then J 13 needs to be removed so that the two power sources will not fight with each other If 5V Power is required to be Supplied via J 2 or J 12 then the jumper J 13 will need to be installed I2C Power selection J8 J4 VCC SV j3 Pin 15 Pin 16 Pin 17 R6 Pin 18 Pd 10k i PIC32MX150 Men 5V J13 aop z J12 ma i LD1117V33 TO220 LM1117 SOT223 2 ne Weg MCP1702 LED1 VR1 sv VR2 vcc VR3 VCC Red 3mm C2 100nF C Grn 3mm Schematic the actual physical pin numbering The physical pin numbering shown of the PIC32M X150F128B In this schematic does not reflect NOTE Bill of Materials Cl 47uf 6v3 Tantalum SMD Low ESR Should be a Surface mount device C2 100nF 0 1 Monolithic C iP a ime owon iP e o owo SSS 4pin H eader M ale N e UJ pas 14pin Header Male or Female User choice Male or Female User choice Male or Female 0 2pin Header Male 11 12 gt m WW LED1 Red 3mm 5V indicator
7. orum forum posts asp Tl D 6271 amp PN 1 W hiteW izard s 44pin htt p www thebackshed com forum forum posts asp Tl D 6289GPN 8 MuP is minimalist by design After the hard work has been done expect the uMite to be installed in some hidden out of the way cabinet merrily doing its job never to be disturbed again There would be no need fora USB to TTL communication interface and have designed it to be powered by arelatively cheap USB plug pack wall wart 1A 5Vdc input 3v3 is generated on board size and cost being my main goals MuP is only 49 5mm x 43 2mm 1 95 x 1 70 MuP Version 2 MuP Ver 2 has strayed alittle bit fromthe Minimalist perspective but feel that the enhancements have made MuP Ver 2 a considerably better product MuP Ver 2 is the same physical size as its predecessor the differences from Ver 1 are covered inthe next section Version 2 Differences MuP Ver 1 was pretty popular but there were a couple of areas that needed to be addressed that enabled me to implement a few improvements to Mup These include l Pullups for the C lines Dat amp Clk with link options J 10 11 to enable or disable them 2 The addition of a 1k resistor to enable 5V TTL level Tx in to be used this can be jumpered out J 9 if 3v3 TTL Tx in is to be used 3 Fixed a silk screen overlay error that had the Clk and Dat labels for C reversed 4 Added a new header location J 12 to support W hiteW
8. poses as they may affect the performance of these pins I f you wish to use 2C the J umpers to enable these J 10 amp J 11 need to be installed f not using C REMOVE the jumpers If you do wish to use C Geoff suggests the following values for R6 amp R7 10KQ2 for 100KHz or 2K for 400 kHz APPENDIX A If you wish to use of the FTDI 3v3 cables similar to the ones available from DONTRONICS COM http www dontronics shop com ftdi usb to serial ttl level 3 3v converter cable html You will have to modif y the pinout of the female header as shown below Original Pinout Black GND Brown CTS Red Vee 5V Orange Tx 3v3 TTL Yellow Rx 3v3 TTL Green RTS Modified Pinout Black GND Red Vee 5V N C N C Orange Tx 3v3 TTL Yellow Rx 3v3 TTL The Green RTS and Brown CTS wires may be simply cut off or taped back out of the way so that they don t short with other connections It is avery simple process to remove a wire fromthe plastic connector simply use a sharp blade to gently lift the small plastic locking tab and pull the terminal out of the connector To fit a terminal into another position simply push it in until it clicks
9. utput or any other 3v3 source however power draw could be limited and would recommend not fitting the LEDs to minimise current draw This is NOT my preferred way to power MuP V2 If you intend to power the MuP via a 3v3 supply eg viaa USB TTL adapter the voltage Regulator Vr1 Vr2 or Vr3 should NOT be fitted The intended locations to supply 5v input is via header J 2 or J 3 recommend male header pins for J 1 J 2 J 3 6 7 8 J 9 J 10 11 amp J 13 and a female header for J 12 Headers J 4 and J 5 may be either male or female depending on your own preferences as these are the connection points for the outside world and will vary depending on the environment MuP is to be used in Connections J 1 I CSP This is the CSP header for connection to a PI CKI T3 to program a new firmware into the Pic32 2 12 Console nputs These are primarily to connect toa USB TTL serial adapter but can also accept 3v3 ONLY J 2 and or 5v POW ER inputs NOTE DoNOT connect 3v3 from an external source if any of the Voltage Regs VR1 VR3 are fitted W hiteW izard s USB Module Plugs directly into J 12 For more details see http micromite org shop development t ools usb to serial module bas AJ S lt O _ io Q Ez G yon i lt OQ Generally this is a3 wire connection Tx Rx amp Gnd if MuP is powered via J 3 to an external USB to TTL adapter for communication with a PC but it may be
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