《16-Bit PWM Using an On-Chip Timer》.pdf

CYGNAL Application Note AN010 - 16-Bit PWM Using an On-Chip Timer Relevant Devices This application note applies to the following devices: C8051F000, C8051F001, C8051F002, C8051F005, C8051F006, C8051F007, C8051F010, C8051F011, C8051F012, C8051F015, C8051F016, C8051F017, C8051F220, C8051F221, C8051F226, C8051F230, C8051F231, and C8051F236. Note: the C8051F0xx devices have an on-chip PCA whic hmay be more suitable for PWM generation. See AN007 for more information. Introduction be used to evaluate the C8051F220/1/6’s ADC This document describes how to implement a 16-bit pulse width modulator (PWM) digital- Key Points to-analog converter (DAC) .The PWM con- sists of two parts: • The C8051F2xx family SoC’s feature three on-board 16-bit timers that can be used for 1 .A timer to produce a PWM waveform of a PWM generation .This example uses given period and specified duty cycle Timer 0 to produce the PWM wave which 2 .A low-pass filter to convert the PWM is output to a general-purpose port pin wave to an analog voltage level output • The C8051F2xx family of SoC’s have an 8-bit ADC that is used in the provided A PWM coupled with a low-pass filter can be example to sample the output of the PWM used as a simple, low cost digital to analog DAC converter (DAC) .This output can be used to • The C8051F226-TB target board features a drive to a voltage controlled device, or used in low-pass filter that can readily be used for a feedback control system where an analog-to- the PWM