Cypress CY8C24894 用户手册

Document Number: 38-12018 Rev. *M

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The Analog System is composed of 6 configurable blocks, each

comprised of an opamp circuit allowing the creation of complex

analog signal flows. Analog peripherals are very flexible and can

be customized to support specific application requirements.

Some of the more common PSoC analog functions (most

available as user modules) are listed below.

■

Analog-to-digital converters (up to 2, with 6 to 14-bit resolution, 

selectable as Incremental, Delta Sigma, and SAR)

■

Filters (2 and 4 pole band-pass, low-pass, and notch)

■

Amplifiers (up to 2, with selectable gain to 48x)

■

Instrumentation amplifiers (1 with selectable gain to 93x)

■

Comparators (up to 2, with 16 selectable thresholds) 

■

DACs (up to 2, with 6- to 9-bit resolution)

■

Multiplying DACs (up to 2, with 6- to 9-bit resolution)

■

High current output drivers (two with 30 mA drive as a PSoC 

Core Resource)

■

1.3V reference (as a System Resource)

■

DTMF Dialer

■

Modulators

■

Correlators

■

Peak Detectors

■

Many other topologies possible

Analog blocks are arranged in a column of three, which includes

one CT (Continuous Time) and two SC (Switched Capacitor)

blocks, as shown in 

3.0.1  The Analog Multiplexer System
The Analog Mux Bus can connect to every GPI/O pin in ports 0-5.

Pins are connected to the bus individually or in any combination.

The bus also connects to the analog system for analysis with

comparators and analog-to-digital converters. It is split into two

sections for simultaneous dual-channel processing. An

additional 8:1 analog input multiplexer provides a second path to

bring Port 0 pins to the analog array.
Switch control logic enables selected pins to precharge continu-

ously under hardware control. This enables capacitive

measurement for applications such as touch sensing. Other

multiplexer applications include:

■

Track pad, finger sensing.

■

Chip-wide mux that allows analog input from up to 48 I/O pins.

■

Crosspoint connection between any I/O pin combinations.

http://www.cypress.com

 > Design

Resources > Application Notes. In general, and unless otherwise

noted in the relevant Application Notes, the minimum

signal-to-noise ratio (SNR) for CapSense applications is 5:1.

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A S D 2 0

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P 0 [6 ]

P 0 [4 ]

P 0 [2 ]

P 0 [0 ]

P 2 [2 ]

P 2 [0 ]

P 2 [6 ]

P 2 [4 ]

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P 0 [5 ]

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