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AN2099 - PSoC® 1, PSoC 3, PSoC 4, and PSoC 5LP - Single-Pole Infinite Impulse Response (IIR) Filters | Cypress Semiconductor

AN2099 - PSoC® 1, PSoC 3, PSoC 4, and PSoC 5LP - Single-Pole Infinite Impulse Response (IIR) Filters

Last Updated: 
Jul 03, 2017
Version: 
*J

AN2099 describes a topology for a single-pole infinite impulse response (IIR) filter. It includes equations and software to implement this topology; the associated example projects give the user access to filter routines in either assembly or C.

In the real world analog signals are noisy; one example might be the output voltage of a thermistor. It is often undesirable to display or use this noisy data. The best way to remove or “clean up” the noise is to apply a filter to the signal. Ideally, the filter removes the noise and keeps the signal of interest. Filters exist in the analog domain that can be used to reduce noise. However, this results in extra cost and power consumption of an analog filter. That is where digital filters come in. IIR filters can be used to approximate many common analog filters.

Project
Device
PSoC Creator
Version
Development Kit
CY8CKIT-xxx
Compiler
Architecture
Silicon
Revision
V2.1 SP1
or higher
V2.1/2.0
001
DVK
030/050
DVK
003/014
FTK
Keil
GCC
RVDS
MDK

AN2099.zip

Prod
YES
NO
YES
YES*
NO
YES
N/A
N/A
N/A
Prod
YES
NO
YES
YES*
NO
N/A
YES
YES
YES
AN2099_Archive.zip
ES3, Prod
NO
YES
YES
YES*
NO
YES
N/A
N/A
N/A
ES1, Prod
NO
YES
YES
YES*
NO
N/A
YES
YES
YES

 *Refer to Migrating CY8CKIT-001 DVK project to CY8CKIT 030/ 050

Notes:
  1. For PSoC 5 project and related document, please download file AN2099_Archive.zip.

Projects associated with this application note can be downloaded from the 'Related Files' section below. For your convenience, we have provided projects that are compatible with the two most recent versions of PSoC Creator:

  • AN2099.zip is used with PSoC Creator 2.1 SP1
  • AN2099_Archive.zip is used with PSoC Creator 2.1/2.0

The project’s default settings may not be compatible with your device or kit, and you may need to change your project settings. For more information, see: