Presentation 3 – Team 6 Brian Gallert Detailed Block Design User Interface Microprocessor Brian Gallert

User Interface Block Diagram 120 VAC To System ON/OFF Push Button 5 VDC Base Current/ Gate Voltage Rotary Dial Left/Right Toggle Switch To System Device Rotary Dial To Microprocessor Collector Volts Rotary Dial Current scaling Rotary Dial Series Res. Rotary Dial # of Steps Rotary Dial Brian Gallert

User Interface Architecture Base Current/Gate Voltage Increments Power Device Tested Series Resistance On/Off 100uA/ 100mV MOSFET 10uA/ 10mV 1mA/ 1V 1kΩ PNP 100Ω 10kΩ Left / Right Switch 10mA/ 10V JFET 1uA/ 1mV 10Ω 100kΩ NPN 1MΩ 1Ω 100nA/ 100uV 100mA/ 10V 10MΩ Device Under Test Left Right Collector Voltage Scaling Current Scaling Number of Steps C C Half B B 100uA/ DIV 2 3 10uA/ DIV 1mA/ DIV 1 E E 4 1uA/ DIV 10mA/ DIV Reset Full Zero On/Off Activate # of Steps Brian Gallert

User Interface Component Selection Device to be tested 4 position 3 pole rotary dial Base Current/Gate Voltage Increments 5 position 1 pole rotary dial Series Resistance 8 position 1 pole rotary dial Collector Voltage Scaling Rotary Dial directly connected to potentiometer Current Scaling Number of Steps 4 position 1 pole rotary dial Brian Gallert

User Interface Bill of Materials Part Part Description Company Part # Quantity Price Push Button Red, ON/OFF Button Jameco 315483CC 1 $1.29 Yellow, Activate # Steps 315521CC Momentary Push Button White, Reset 315467CC Toggle Switch 1 pole, 2 position switch to choose between left or right device 76241CC $1.49 Rotary Dial 4 position, 3 pole switch to select device to be tested 101565CC $1.95 8 position, 1 pole switch to select increments, series limiting resistance, and current scaling 101531CC 3 $1.09 6 position, 2 pole switch to select number of steps 101573CC $1.35 Knob to connect to dials Black with position marker can connect to dials 265009CC 6 $0.69 Brian Gallert

User Interface Signals to Micro Device to be tested – Pins 11 and 12 NPN – 00 (Not Connected) PNP – 01 N-Channel MOSFET - 10 N-Channel JFET - 11 Base Current/Gate Voltage Increments – Pins 16, 17, 18 10 uA/10mV – 000 (Not Connected) 20uA/20mV – 001 50uA/50mV – 010 100uA/.1V – 011 200uA/.2V – 100 500uA/.5V – 101 1mA/1V – 110 2mA/2V - 111 Brian Gallert

User Interface Signals to Micro Reset – Pin 1 When pressed, sends a pulse to micro and restarts Activate Number of Steps – Pin 15 Sends a 1 to the Microprocessor initiating Selectable # of Steps Select Number of Steps – Pins 13, 14 1st Step – 00 (Not Connected) 1st and 2nd Step – 01 1st, 2nd and 3rd Step – 10 1st, 2nd, 3rd, and 4th Step - 11 Brian Gallert

User Interface Switches to System Left/Right Switch Switches between testing device on left socket and right socket, engages one or the other Collector Voltage scaling Connected to potentiometer to scale the collector voltage from 30V (full) – 0 V Series Limiting Resistance Selects between 8 different resistances to limit the current flowing to the collector of the device under test Brian Gallert

User Interface Switches to System Device to be tested NPN – uses 2 of the 3 poles of switch to Send positive Collector Voltage to device under test Send positive Base Current to device under test PNP – uses 2 of the 3 poles of switch to Send negative Collector Voltage to device under test Send negative Base Current to device under test MOSFET – used 2 of the 3 poles of switch to Send positive Drain Voltage to device under test Send positive Gate Voltage to device under test JFET – uses 2 of the 3 poles of switch to Send negative Gate Voltage to device under test Brian Gallert

User Interface Switches to System ON/OFF Allows power from outlet to turn on curve tracer Current Scaling Can be used to scale the collector voltage flowing through device under test Allows for better resolution of the curves Brian Gallert

User Interface – Analog DFM Plan Sub Circuit Type Applicable Worst Case Analysis Plan (See DFM Analysis Guide) Task 1 Task 2 Task 3 Task 4 Task 5 Task 6 Task 7 Analog Switches Contact Type Contact Impedance Current Contact Rating Semicond Package & Heatsink 1. Push Button On/off 30 mΩ 3A Rectangular Panel Mount 2. Toggle Switches 40 m Ω 4A 3. 8 position 1 pole dials Make before Break 30 m Ω .3A Circular Panel Mount 4. 4 position 3 pole dials Make Before Break Brian Gallert

Microprocessor Block Diagram 5 V Activate # of Steps Analog Input Collector Voltage PIC 16F876 Base Current/ Gate Voltage Rotary Dial Device Rotary Dial Voltage or Current Selector (8 bit number) Reset Analog Input Base/Gate Voltage # of Steps Rotary Dial From User Interface Brian Gallert Clock

Microprocessor Architecture Layout Brian Gallert

Microprocessor Component Selection PIC16F876 Clock Low Profile 4 Mhz Crystal 2 - 24 pF Capacitors to oscillator pins 9 and 10 Analog Inputs In series with 1kΩ resistor Voltage divider to maintain at 0-5 V level Brian Gallert

Microprocessor Analog Input DFM Collector voltage input range 0 – 34.5 V Acceptable microprocessor voltage input range 0-5.5 V Need voltage divider to scale to less than 5.5 V Choose Vout as 4.5V R1 as 1 k Vin = 34.5 V (worst case) Therefore, R2 = 150 For 10% tolerance worst case R1 = 900 R2 = 165 Vin = 34.5 Vout = 5.35 < 5.5V Vin Vout Brian Gallert

Microprocessor Bill of Materials Part Part Description Company Part # Quantity Price Processor PIC16F876 Jameco 193367CC 1 $7.89 4Mhz Crystal Low profile crystal 137832CC $.99 24pf Capacitor Surface Mount capacitors connected to clock input 2 PCB Fiberglass board to mount clock and processor $10.00 1k Resistor Surface Mount resistors to place in series with analog inputs 200 Resistor Surface Mount resistor to place in parallel with analog input for the collector voltage .1uF radial lead capacitor Capacitor to protect processor- Pins across ground and +5V Brian Gallert

Microprocessor – Analog DFM Plan Sub Circuit Type Applicable Worst Case Analysis Plan (See DFM Analysis Guide) Task 1 Task 2 Task 3 Task 4 Task 5 Task 6 Task 7 Task 8 Task 9 Task 10 Voltage Divider R tolerance Sampling time Min Acquisition time Specified Acquisition Time Analog to Digital Conversion 1.6us Capacitor selection Capacitor tolerance Acceptable cap range Range with tolerance Output Impedance FOSC Noise or Ripple Semicond Package & Heatsink Crystal Cut Quartz Crystal 24 pf 20% 15 pf – 68 pf 19.2 pf-28.8 pf 4 Mhz Metal Can Brian Gallert

Micro DFM – DC Drive Analysis Dig Device Output Type Input Type Tech Type DC Drive Device Parameters Vil max Vih min Iil (-) Max Iih Vol Voh Iol Ioh (-) Min Vhyst Checked PIC16F876 STD CMOS .8V 2.0V 1uA -1uA 0.6V 3.8V 15mA -15mA N/A Brian Gallert

Micro DFM – Timing Analysis Table Dig Signal Output Type Input Type Timing Parameters Other Tsu Setup Th Thold Marg Fmax F Tpulse Min Checked Device Under Test Std .1us .9us 4 Mhz Base Current 4Mhz Number of Steps Current Selector Brian Gallert

Microprocessor PCB layout Brian Gallert

Summary of work left User Interface Microprocessor Determine pin out for mechanical switches to entire system Assemble proto-type Microprocessor Write the program to accomplish task Specify the output to the base current generator Finish proto-type assembly Brian Gallert