Currency Counter

Block diagram (SBD) for a Currency Counter supporting ultraviolet, infrared, and magnetic sensing, and CIS / CID imaging for banknote verification, and a powerful processor or microcontroller analytics processing for banknote verification.

Block Diagram

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AC/DC Supply

Design Considerations

Currency Counters not only count, they also function as a high speed counterfeit banknote detector. With the advanced printing, copying and electronic scanning technologies available today, the need to validate currency authenticity has increased dramatically, increasing the demand for continuous improvement of counterfeit detection technologies.

The electronics, are a highly a mixed-signal system driven by a DSP or MCU for system processing, which is surrounded by a high performance analog products.

Ultraviolet, infrared & magnetic sensing are the typical detection techniques used today to verify the inherent characteristics of banknotes. More advanced systems, capture the banknote images with a CIS or CCD scan, enabling the recognition of denomination, serial number and other aspects of each note.

  • Fluorescence detection uses UV light to check for missing marks & irradiation response of the fake notes.
  • Magnetic ink & different patterns of security strip can be detected by using the magnetic head with a precision amplification scheme.
  • Infrared penetration is used to the thickness detection of the banknote & the absorption of infrared signals to identify the genuine banknotes.

The response signals of these various transducers are low level signals which are very sensitive to system noise. As such a high performance signal conditioning design is required. Multiple channel input, high resolution data converters help simplify the design layout & ensure the accurate measurement.

For those systems which require banknote imaging, in addition to high performance analog signal chains, a system processor such as DSP or ARM combined with a CIS/CCD AFE, capable of complicated algorithmic calculations would be required. The additional processing capability allows the system to perform denomination classification, OCR recognition & banknote fitness detection, etc.

Understandably, there are design trade offs between sheer counting speed and amount of banknote validation that can be done. However, improved motor control and drive designs can help with overall system optimization. Especially as many designs are migrating to BLDC & Stepper motors, due to their low-maintenance, precision & controllability characteristics.

Application Notes (4)

Title Abstract Type Size (KB) Date Views
HTM 8 KB 19 Aug 2008 1593
HTM 8 KB 15 Mar 2007 1432
HTM 9 KB 29 Apr 1999 1135
HTM 8 KB 01 Jan 1996 955
    

Reference Designs

Selection and Solution Guides

Solution Guides (1)

Title Abstract Type Size (KB) Date Views
PDF 5.83 MB 26 Jan 2014 13165

Tools and Software

Name Part # Company Software/Tool Type
C28x IQMath Library - A Virtual Floating Point Engine SPRC087 Texas Instruments Application Software & Frameworks
Code Composer Studio (CCS) Integrated Development Environment (IDE) CCSTUDIO Texas Instruments SW Development Tools, IDEs, Compilers
TMS320C6748 DSP Development Kit (LCDK) TMDXLCDK6748 Texas Instruments Development Kits

Product Bulletin & White Papers

White Papers (2)

Title Abstract Type Size (MB) Date Views
PDF 419 KB 09 May 2012 421
PDF 651 KB 06 Jan 2012 561

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