Cypress CapSense CY8C20x36 Guia do Utilizador descarregar pdf (Página 58)

58 Document No. 001-64846 Rev. *I Getting Started with CapSense

4.1.3 CapSense Plus (Programmable Solutions)

Figure 4-1. CapSense Plus

CapSense

Plus

CapSense

LED Effects,

Proximity,

Audio,

Haptics

C, TX8,

UART, SPI,

USB

PWM,

Counters,

Timers

ADC,

Comparators,

Noise

Filtering

System Functionality

CapSense Plus devices feature capacitive touch sensing and additional system functionality. Using CapSense Plus

devices can result in significant cost savings. Additional features include:

 Feedback - LED, audio, haptics

 Communication - I

C, TX8, UART, SPI, USB

 Digital functions - PWM, counters, timers

 Analog functions - ADC, comparator

 Bootloaders

4.1.3.1 CY8C20xx6A/AS, CapSense Plus

CY8C20xx6A/AS devices can operate at voltages as low as 1.71 V to 5 V, offer both CSA_EMC, CSD capacitive

sensing, SmartSense and SmartSense_EMC, and support up to 33 CapSense buttons, USB, I

C, SPI, and up to

32-KB Flash memory.

4.1.3.2 CY8C21x34/B, CapSense Plus

CY8C21x34 devices feature CSD capacitive sensing and SmartSense sensing (CY8C21x34B) with advanced digital

and analog peripherals, are water tolerant, and can support up to 24 CapSense buttons.

4.1.3.3 CY8C24x94, CapSense Plus

CY8C24x94 devices feature CSD capacitive sensing, proximity sensing, are water tolerant, support a wide range of

interfaces (SPI, I

C USB 2.0, and UART), and can support up to 44 CapSense buttons.

4.1.3.4 Dynamic Reconfiguration

Dynamic reconfiguration is a clever way to optimize total system cost. There are situations in which the number of

digital and analog blocks required by a particular application exceeds the resources of the chip. In these situations, it

may be possible to time-share the analog and digital blocks. The process of reusing analog and digital resources at

different points in time is called dynamic reconfiguration. If the application requires CapSense, an ADC, and a

counter, but not all at the same time, reconfiguring the hardware blocks dynamically will enable all features to be

implemented. For more information about dynamic reconfiguration, see the Cypress application note AN2104 –

PSoC 1 - Dynamic Reconfiguration with PSoC Designer.

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