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AN2161 - PSoC® 1 Analog - Voltage-to-Frequency Converter | Cypress Semiconductor

AN2161 - PSoC® 1 Analog - Voltage-to-Frequency Converter

Last Updated: 
Oct 08, 2015
AN2161 describes two methods for implementing a continuous time (CT) voltage-to-frequency (V/F) converter using the PSoC®1 device. Both methods are implemented in hardware, and the CPU is not used during the operation.

Voltage-to-frequency (V/F) converters are widely used in industrial electronics, frequency-shift keying modulators, phase-locked loop systems, analog-to-digital converters, isolation amplifiers, etc. Even though these converters are produced as standalone devices, they still require several external components and are relatively expensive in comparison to modern low-cost analog integrated circuits. The PSoC allows the designer to build the V/F using only one continues continuous time (CT) analog block (configured as schmitt trigger) and one switched capacitor (SC) analog block (configured as integrator), without any external analog components. All digital blocks, and the CPU, are at user disposal. The designer will get a useful device function with virtually no additional cost or extra components. Moreover, the proposed V/F converter produces both meander and symmetric sawtooth signals, which are useful for some applications such as analog PWM modulators and capacitance meters.


Example Project

Supported H/W and S/W Supported PSoC1 Devices
PSoC Designer Version H/W Kit CY8C20xxx CY8C21xxx CY8C22xxx CY8C23xxx CY8C24xxx CY8C27xxx CY8C28xxx CY8C29xxx



CY3250 Pod with external board        

x23A, x94