SI-Testing

Spring 2024, Dr. Shalan

Goal: is to provide a circuit capable of testinga chip under changing voltage and temperature.

• for temperature, we are using a thermoelectric cooler. as a sub goal we need to supply with an ideal controlling (PWM) signal to be able to vary the temperature rapidly

Raspberry Pi Pico W

Getting Started: https://projects.raspberrypi.org/en/projects/getting-started-with-the-pico/1

Documentation: https://www.raspberrypi.com/documentation/microcontrollers/raspberry-pi-pico.html

Pinout Diagram

Our digital Microcontroller

• Will host micropython code to execute and control the circuitry
  • The code will have the PID which controlls the PWM signal

Relay Switch : To be documented

Datasheet:

• is used to protect the Pico from the Temperature varying circuitry
• The PWM signal is suppled to it

Peltier : TEC1-12706

Datasheet: https://www.alldatasheet.com/datasheet-pdf/pdf/227422/ETC2/TEC1-12706.html

A better datasheet or reference is needed

Thermoelectric cooler

• is used to cary the temperature on the chip
• $12V$, $6A$
• switches heating and cooling sides when current direction is switched

Digital Potentiometer : MCP4131-103E/P

Datasheet: https://u.pcloud.link/publink/show?code=XZEJx00Z2zHjB7IoRRXOGcCnvikJS4BVzfdy

Volatile Memory Digital Potentiometer

• Is used to vary the voltage on the chip
• Has memory to remember the latest resistance setting

Second Digital Potentiometer : X9C103S

Datasheet: https://u.pcloud.link/publink/show?code=XZEJx00Z2zHjB7IoRRXOGcCnvikJS4BVzfdy Example: https://electropeak.com/learn/interfacing-x9c103s-10k-digital-potentiometer-module-with-arduino/

• Is used to vary the voltage on the chip
• 0-10kΩ with 100 steps
• Up to ±5V across the potentiometer end-points

Temperature Sensor : DS18B20 Waterproof Temperature Sensor

Datasheet: https://u.pcloud.link/publink/show?code=XZfujk0ZSR5hogIrCKkFY19oXnh8zp0lHThX

• Will provide temperature input to the PICO from the Thermoelectric cooler to be given to the PID

Thermometer : TP101

Datasheet: https://u.pcloud.link/publink/show?code=XZfujk0ZSR5hogIrCKkFY19oXnh8zp0lHThX

• Measuring Temperature Range: -50 to 300 degrees (-58 to 572 Fahrenheit)

Thermometer with probe: TPM-10

Datasheet: https://u.pcloud.link/publink/show?code=XZfujk0ZSR5hogIrCKkFY19oXnh8zp0lHThX

• Temperature range: -50°C~ 110°C
• Temperature accuracy: ±1°C
• Resolution: 0.1°C

Voltage Regulator: LM317

Datasheet: https://u.pcloud.link/publink/show?code=XZqG0X0ZURodwRRACp8z1VfRVn5GCHM6Uq97

It will be used to assist with voltage control. See the voltage control circuit diagram for more details

[!NOTE]

Optional circuitry \ High Power Resistor

• is used to reduce current on the thermoelectric cooler if normal operating current is too high for our need

H-Bridge

• mainly for experimentation
• is used to be able to switch the polarity on the thermoelectric cooler so we could switch cooling and heating