MIXED SIGNAL VLSI TECHNOLOGY BASED SoC DESIGN FOR TEMPERATURE COMPENSATED  pH MEASUREMENT
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MIXED SIGNAL VLSI TECHNOLOGY BASED SoC DESIGN FOR TEMPERATURE COMPENSATED pH MEASUREMENT

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MIXED SIGNAL VLSI TECHNOLOGY BASED SoC DESIGN FOR TEMPERATURE COMPENSATED

MIXED SIGNAL VLSI TECHNOLOGY BASED SoC DESIGN FOR TEMPERATURE COMPENSATED
pH MEASUREMENT

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MIXED SIGNAL VLSI TECHNOLOGY BASED SoC DESIGN FOR TEMPERATURE COMPENSATED  pH MEASUREMENT MIXED SIGNAL VLSI TECHNOLOGY BASED SoC DESIGN FOR TEMPERATURE COMPENSATED pH MEASUREMENT Presentation Transcript

  • MIXED SIGNAL VLSI TECHNOLOGY BASED SoC DESIGN FOR TEMPERATURE COMPENSATED pH MEASUREMENT S. K. Tilekar1, A. S. Powar1 and B. P. Ladgaonkar1 1- VLSI Design & Research Centre Post Graduate Department of Electronics Shankarrao Mohite Mahavidyalaya, Akluj, Dist. Solapur (MS) t_shivaprasad@rediffmail.com, bladgaonkar@yahoo.com
  • Abstract An innovative field of embedded system exhibit wide spectrum of applications particularly in the field of instrumentation [1]. The VLSI devices like FPGA and CPLD provide the reconfigurability for digital design only. Therefore, for analog parts, the designers have to rely on off chip hardware. This exhibits constraints in instrumentation [2]. The emergence of the innovative technology called mixed signal based VLSI design provides unique solution to above problem [3]. Cypress semiconductor is performing pioneering job in the field of mixed signal based programmable system on chip and vendoring the PSoC5 device with remarkable features [4]. Deploying the features of PSoC5, a system on chip is designed for temperature compensated pH measurement of the solution. Keyword: Mixed Signal PSoC5, ADC, Programmable Gain Amplifier, pH measurement.
  • Op amp LP filter A/D Microcontroller Op ampD/A Sensor Digital Outputs LEDs Competitive Solutions
  • Op amp LP filter A/D Microcontroller D/A Sensor Digital Outputs LEDs PSoC Microcontrollers
  •  Soft as well as hard IP Cores  FPGA platform  Core of the computing device  Specific IDE for system development SoB to SoC
  • Static as well as Dynamic configurability IP Cores FPGA platform Advanced microcontroller Core (ARM Core) Specific IDE for system development P rogrammable S ystem o n C hip
  • – Hardware programmability  Programmable analog blocks  Programmable digital blocks  Programmable interconnect  Programmable I/Os  Programmable clocks  Selectable power supply – Integration as an SoC
  •  32-bit ARM Cortex-M3 CPU core  DC to 80 MHz operation  Flash program memory, up to 256 KB, 100,000 write cycles, 20-year retention, and multiple security features  Up to 64 KB SRAM memory  2-KB electrically erasable programmable read-only memory (EEPROM) memory, 1 million cycles, and 20 years retention  Low voltage, ultra low power  Wide operating voltage range: 0.5 V to 5.5 V  Low power modes including: 2-μA sleep mode  Versatile I/O system  28 to 72 I/Os (62 GPIOs, 8 SIOs, 2 USBIOs)  LCD direct drive from any GPIO, up to 46×16 segments  All GPIOs configurable as open drain high/low, pull-up/pull-down, High-Z, or strong output  Configurable GPIO pin state at power-on reset (POR)  Digital peripherals  20 to 24 programmable logic device (PLD) based universal digital blocks (UDBs)  Full-Speed (FS) USB 2.0 12 Mbps using internal oscillator  Four 16-bit configurable timers, counters, and PWM blocks  Library of standard peripherals  Library of advanced peripherals
  •  Analog peripherals  1.024 V ±0.1% internal voltage reference across –40°C to +85°C (14 ppm/°C)  Configurable delta-sigma ADC with 8- to 20-bit resolution  Two SAR ADCs, each 12-bit at 1 Msps[2]  80-MHz, 24-bit fixed point digital filter block (DFB) to implement finite impulse response (FIR) and infinite impulse response (IIR) filters  Four 8-bit 8 Msps current IDACs or 1-Msps voltage VDACs  Four comparators with 95-ns response time  Four uncommitted opamps with 25-mA drive capability  Four configurable multifunction analog blocks. Example configurations are programmable gain amplifier (PGA), transimpedance amplifier (TIA), mixer, and Sample and Hold  Programming, debug, and trace  Precision, programmable clocking
  •  Voltage output ranges: 1.020-V and 4.080-V full scale  Software- or clock-driven output strobe  Data source can be CPU, DMA, or Digital components
  •  Gain steps from 1 to 50  High input impedance  Selectable input reference  Adjustable power settings
  •  Single or differential connections  Adjustable between 2 and 32 connections  Software controlled  Connections may be pins or internal sources  No simultaneous connections  Bidirectional (passive)
  •  Selectable resolutions, 8 to 20 bits (device dependent)  Eleven input ranges for each resolution  Sample rate 10 sps to 384 ksps  Operational modes:  Single sample  Multi-sample  Continuous mode  Multi-sample (Turbo)  High input impedance input buffer  Selectable input buffer gain (1, 2, 4, 8) or input buffer bypass  Multiple internal or external reference options  Automatic power configuration  Up to four run-time ADC configurations
  •  Implements the industry-standard Hitachi HD44780 LCD display Driver chip protocol  Requires only seven I/O pins on one I/O port  Contains built-in character editor to create user-defined Custom characters  Supports horizontal and vertical bar graphs
  •  Linear current output: 1 μA/K  Wide temperature range: −55°C to +150°C  2-terminal device: voltage in/current out  Laser trimmed to ±0.5°C calibration accuracy (AD590M)  Excellent linearity: ±0.3°C over full range (AD590M)  Wide power supply range: 4 V to 30 V  Sensor isolation from case  Low cost
  • 1) The visual method 2) The photometric method 3) The potentiometric method
  • E = Eo – K Tk pH Nernst Factor K = 0.19841 (273.15+T oC)
  • Execute boot program: --initialise general purpose resources; --configure application specific modules; --initialise run time environment; --disable interrupt; call main application routine; Void main() { Start system timers; Initialise application specific modules; Initialise global variables; Initialise application specific channels; Enable interrupts; While(1) { Wait for events(Enabled interrupts); Read values from input channels; Execute control procedure & compute actuation data; output actuation data to output channels; } } B) Application programme routine A) Boot programme algorithm STRUCTURE OF FIRMWARE
  • #include <device.h> #include <stdio.h> float pH_Input_Signal(); float Temp_Input_Signal(); void soft_delay(unsigned int count); int i=1,j=1; float result=0,pH_Result,Average_pH,pH_value,pH_Temp_Copensated,pH_valueDirect; float Temp_Result,Temp_value,Average_Temp,Temp_Calibrated;
  • void main() { char pH_Str[5]={'0'}; PGA_1_Start(); PGA_2_Start(); VDAC8_1_Start(); LCD_Char_1_Start(); ADC_DelSig_1_Start(); char Temp_Str[4]={'0'}; AMuxSeq_1_Start(); while(1) { AMuxSeq_1_Next(); LCD_Char_1_Position(0,0); LCD_Char_1_PrintString("T:"); Temp_Result=Temp_Input_Signal(); Temp_value = Temp_Result-273; Temp_Calibrated=(Temp_value+0.7503)/1.0377; LCD_Char_1_Position(0,2); sprintf(Temp_Str,"%4.2f",Temp_Calibrated); LCD_Char_1_PrintString(Temp_Str); MuxSeq_1_Next(); LCD_Char_1_Position(1,0); LCD_Char_1_PrintString("pH:"); pH_Result=pH_Input_Signal(); pH_value = (pH_Result)/(0.19841*(273.15+Temp_Calibrated)); //Nernst equation LCD_Char_1_Position(1,3); sprintf(pH_Str,"%5.2f",pH_value); LCD_Char_1_PrintString(pH_Str); pH_valueDirect = ((pH_Result-24)/59.16); LCD_Char_1_Position(0,9); sprintf(pH_Str,"%5.2f",pH_valueDirect); LCD_Char_1_PrintString(pH_Str); } }
  • float pH_Input_Signal() { float total=0,Sampling_Rate=1000; for(i=1;i<=Sampling_Rate;i++) { ADC_DelSig_1_StartConvert(); ADC_DelSig_1_IsEndConversion(ADC_DelSig_1_WAIT_FOR_RESULT); total=total+ADC_DelSig_1_GetResult16(); soft_delay(1000); } Average_pH=((total/Sampling_Rate)*3); return(Average_pH); }
  • float Temp_Input_Signal() { float total=0,Sampling_Rate=750; for(j=1;j<=Sampling_Rate;j++) { ADC_DelSig_1_StartConvert(); ADC_DelSig_1_IsEndConversion(ADC_DelSig_1_WAIT_FOR_RESULT); total=total+ADC_DelSig_1_GetResult16(); soft_delay(2000); } Average_Temp=((total/Sampling_Rate)*4); return(Average_Temp); }
  • y = 1.0515x - 3.22 R² = 0.9989 0 20 40 60 80 100 120 0 50 100 150 Temperature in oC from Thermometer TemperatureinoCfromSystem
  • Temp Measured (Thermometer) Temp Measured (PSoC) 40 39.94 45 44.94 50 49.97 55 54.93 60 59.95 65 64.95 70 69.91 75 75.01 80 80.01 85 85.02 90 90.41 95 95.52 100 100.56
  • Temp Measured in o C (Thermometer) Temp dependent NERNST volt in mV From system (PSoC) Temp dependent NERNST volt in mV From datasheet 20 58.18 58.16 25 59.17 59.16 30 60.16 60.15 35 61.13 61.14 40 62.13 62.13 45 63.14 63.12 50 64.13 64.12 55 65.12 65.11 60 66.12 66.10 65 67.11 67.09 70 68.09 68.08 75 69.10 69.08 80 70.09 70.07
  • The system is calibrated to pH scale and implemented for measurement of temperature compensated pH of the solution. The pH value shown by the system under investigation are identical to that of measured by standard pH meter. Thus SoC designed to measure pH of the solution is more reliable and accurate.
  • 1) Y. Sukanya, S. Pathapati, “FSK Modem Using PSoC”, International journal of soft computing and engineering, 2 3 (2012) 451. 2) L.M. Franca-Neto , P. Pardy, M.P. Ly, R. Rangel, S. Suthar, T. Syed, B. Bloechel, S. Lee, C. Burnett, D. Cho, D. Kau, A. Fazio and K. Soumyanath, “Enabling High-Performance Mixed-Signal System-on-a-Chip (SoC) in High Performance Logic CMOS Technology”, Symposium on VLSI Circuits Digest of Technical Papers, (2002)164-167. 3) L.S.Y. Wong, S. Hossain, A. Ta, J. Edvinsson, D.H. RivasandH. Naas, “A very low-power CMOS mixedsignal IC for implantable pacemaker applications” IEEE Journal of Solid-State Circuits, 39 12 (2004) 2446-2456. 4) M. Nagata, J. Nagai, T.Morie and A. Iwata, “Measurements and Analyses ofSubstrate Noise Waveform in Mixed-Signal ICEnvironment,” IEEE Transactions on CAD, 19 6 (200) 671-678. 5) K. Makie-Fukuda, T. Kikuchi, T. Matsuura, M. Hotta, “Measurement of digital noise in mixed-signal integrated circuits”, IEEE Journal of Solid-State Circuits, 30 2 (1995) 87-92.
  • Research Activities MRP : 01 Completed Publications : International Journals 01 : International Journals (Communicated) 01 : National Journals 01 : National Journals (Communicated) 01 : Proceedings International 02 : Proceedings National 42 Papers presented in conferences : International 01 : International (Abroad) 01 : National 12