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Infusion Pump | Cypress Semiconductor

Infusion Pump Background

Infusion Pumps are used to control medicine and fluids delivered to patients. An Infusion pump usually includes a fluid reservoir, an electro mechanical assemble for controlling fluid flow and catheter system for transferring fluids to the patient. Accurate flow control is critical. PSoC interfaces with sensors in the infusions pump to monitor parameters like pressure or force (fluid flow), temperature, air in-line and provide outputs to control fluid metering through a valve or motor and to identify an alarm condition. PSoC product solutions can also provide direct LCD drive and control, key pad or touch screen interface, power management and USB or RS-232 communication.

Block Diagram

PSoC programmable analog & digital resources integrate everything shown in light blue below. Click on the colored blocks to view or sample the recommended PSoC Components.


The flexibility of PSoC allows you to customize each colored block, or PSoC Component, to meet your design requirements through the easy-to-use PSoC Creator Software IDE.  These Components are available as pre-built, pre-characterized IP elements in PSoC Creator.

Design Considerations

PSoC® 3 and PSoC 5 provide a scalable platform which integrates all the required circuitry to provide a configurable Infusion Pump in a single chip, including:

 • High precision Analog front end, including a 0.1% accurate Voltage reference and up to 20 bits of resolution
 • Circuitry for controlling the Relay Valve for controlling the flow rate and flow uniformity
 • LCD direct drive and control
 • Power management capabilities including Battery Charging and Protection, Fuel Gauge, and Voltage Sequencing / Monitoring.
 • CapSense fully integrated for buttons
 • Communications including FS USB and RS-232
 • On chip EEPROM

Application Notes

  • AN52927 demonstrates how easy it is to drive a segment LCD glass using the integrated LCD driver in PSoC 3 and PSoC 5LP. This application note gives a brief introduction to segment LCD drive features and provides a step-by-step procedure to design Segment LCD applications using the PSoC Creator tool.

  • AN57821 introduces basic PCB layout practices to achieve 12- to 20-bit performance for the PSoC 3, PSoC 4, and PSoC 5LP family of devices.

  • AN58304 provides an overview of the analog routing matrix in PSoC® 3 and PSoC 5LP. This matrix is used to interconnect analog blocks and GPIO pins. A good understanding of the analog routing and pin connections can help the designer make selections to achieve the best possible analog performance. Topics such as LCD and CapSense routing are not covered in this application note.

  • AN58827 discusses how internal trace and switch resistance can affect the performance of a design and how these issues can be avoided by understanding a few basic details about the PSoC® 3 and PSoC 5LP internal analog architecture.

  • This application note describes how to configure the PSoC® 3 and PSoC 5LP IDACs as a flexible analog source. It presents different approaches for using the IDACs in applications, and discusses the advantages and disadvantages of the topologies presented. This application note will: help you to understand compliance voltage and why it is important; explain how to generate an “any range” or “any ground” VDAC; describe an implementation for a multiplying VDAC; give details on how to build a rail-to-rail low-output impedance 9-bit VDAC from a single IDAC, an opamp, and a resistor; and provide information on how to build a current scaling circuit with an opamp and two resistors.

  • AN60590 explains diode-based temperature measurement using PSoC® 3, PSoC 4, and PSoC 5LP.

  • AN64275 discusses several methods to increase the resolution of the DACs available in the PSoC® 3 and PSoC 5LP families. These methods can be used to extend the resolution up to 12 bits. An example application is supplied to demonstrate most of these concepts. A library is also included that implements three of the methods as PSoC Creator¿ components.

Development Kits/Boards

  • The CY8CKIT-001 PSoC® Development Kit (DVK) provides a common development platform where you can prototype and evaluate different solutions using any one of the PSoC 1, PSoC 3, PSoC 4, or PSoC 5 architectures.

  • Cypress's PSoC programmable system-on-chip architecture gives you the freedom; to not only imagine revolutionary new products, but the capability to also get those products to market faster than anyone else. Explore PSoC 3's precision analog capabilities through the on board 20-bit Delta Sigma ADC used to measure voltage ranges between -30 V and 30 V.

  • The CY8CKIT-029 PSoC® LCD Segment Drive Expansion Board Kit allows you to evaluate PSoC's LCD drive capability using LCD segment component in Cypress's PSoC Creator™.

Software and Drivers

  • PSoC Creator

    PSoC Creator is a state-of-the-art software development IDE combined with a revolutionary graphical design editor to form a uniquely powerful hardware/software co-design environment.

  • PSoC Designer

    PSoC Designer is the revolutionary Integrated Design Environment (IDE) that you can use to customize PSoC to meet your specific application requirements. PSoC Designer software accelerates system bring-up and time-to-market.