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PIC16F722AT-I/SP Datasheet(PDF) 117 Page - Microchip Technology |
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PIC16F722AT-I/SP Datasheet(HTML) 117 Page - Microchip Technology |
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117 / 284 page ![]() 2010 Microchip Technology Inc. DS41417A-page 117 PIC16F/LF722A/723A 14.0 CAPACITIVE SENSING MODULE The capacitive sensing module allows for an interaction with an end user without a mechanical interface. In a typical application, the capacitive sensing module is attached to a pad on a printed circuit board (PCB), which is electrically isolated from the end user. When the end user places their finger over the PCB pad, a capacitive load is added, causing a frequency shift in the capacitive sensing module. The capacitive sensing module requires software and at least one timer resource to determine the change in frequency. Key features of this module include: • Analog MUX for monitoring multiple inputs • Capacitive sensing oscillator • Multiple timer resources • Software control • Operation during Sleep FIGURE 14-1: CAPACITIVE SENSING BLOCK DIAGRAM T0CS CPS0 CPS1 CPS2 CPS3 CPS4 CPS5 CPS6 CPS7 CPSCH<2:0> Capacitive Sensing Oscillator CPSOSC CPSON CPSRNG<1:0> TMR0 0 1 Set T0IF Overflow T0XCS 0 1 T0CKI T1CS<1:0> T1OSC/ T1CKI TMR1H:TMR1L EN T1GSEL<1:0> Timer1 Gate Control Logic T1G CPSOUT TMR2 Timer2 Module Set TMR2IF Overflow Postscaler CPSCLK Note 1: If CPSON = 0, disabling capacitive sensing, no channel is selected. FOSC/4 FOSC FOSC/4 Timer0 Module Timer1 Module CPSON(1) WDT WDT Event Overflow Watchdog Timer Module Scaler PS<2:0> LP WDT OSC |
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