CY8C24094, CY8C24794 CY8C24894, CY8C24994

3.1 The Analog System

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 Figure 3-2.

Figure 3-2. Analog System Block Diagram

A ll IO

 

 

 

 

(E x c e p t P o rt 7 )

 

 

 

 

P 0 [7 ]

 

 

 

P 0 [6 ]

P 0 [5 ]

 

 

 

P 0 [4 ]

P 0 [3 ]

 

 

 

P 0 [2 ]

P 0 [1 ]

 

 

 

P 0 [0 ]

 

Analog

Mux Bus

RefIn

P 2 [6 ]

P 2 [3 ]

 

AGNDIn

 

 

P 2 [4 ]

P 2 [1 ]

 

 

 

 

P 2 [2 ]

 

 

 

 

 

 

 

 

P 2 [0 ]

A C I 0 [1 :0 ]

 

A C I 1 [1 :0 ]

 

A rra y In p u t

 

 

 

 

C o n fig u ra tio n

 

 

 

 

B lo c k

A C B 0 0

 

A C B 0 1

 

A rra y

 

 

 

 

 

A S C 1 0

 

A S D 1 1

 

 

A S D 2 0

 

A S C 2 1

 

 

 

 

A n a lo g R e fe re n c e

 

In te rfa c e to

R e fH i

R e fe re n c e

A G N D In

D ig ita l S y s te m

R e fL o

G e n e ra to rs

R e fIn

 

A G N D

 

B a n d g a p

M 8 C In te rfa c e (A d d re s s B u s , D a ta B u s , E tc .)

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.

When designing capacitive sensing applications, refer to the latest signal-to-noise signal level requirements Application Notes, which are found under 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.

Document Number: 38-12018 Rev. *M

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Cypress CY8C24994, CY8C24094, CY8C24894 manual Analog System, Analog Multiplexer System

CY8C24094, CY8C24894, CY8C24994 specifications

The Cypress CY8C24994, CY8C24894, and CY8C24094 are part of the PSoC (Cypress Semiconductor's Programmable System-on-Chip) family, designed to integrate numerous functions onto a single chip for efficient performance and flexibility in various applications.

One of the key features of these devices is their combination of analog and digital components, allowing designers to create a customized system without the need for extensive external circuitry. Each of these chips incorporates an Arm Cortex-M3 processor core, which provides a powerful 32-bit architecture, enabling efficient execution of 32-bit operations while maintaining low power consumption.

The CY8C24994 is the most advanced in this series, supporting up to 128 GPIO (General Purpose Input/Output) pins, which enhances connectivity options. It features multiple programmable analog blocks, including op-amps, comparators, and DACs (Digital-to-Analog Converters), making it suitable for a variety of sensor interfacing and signal processing applications. Additionally, it supports USB communication, providing further versatility for applications requiring data exchange with a host device.

The CY8C24894 presents a slightly more cost-effective solution with slightly fewer GPIO pins and integrated features. It maintains many of the same core attributes as its counterpart, delivering excellent analog performance and several programmable digital blocks. It is suitable for applications requiring moderate computational capabilities along with flexibility in terms of peripherals and interfaces.

The CY8C24094, while positioned as a more basic option within this lineup, still provides essential functionalities for simpler tasks. With fewer pins and capabilities, it is ideal for applications where size and cost are more critical than extensive processing power.

All three devices utilize Cypress's proprietary CapSense technology, enabling touch-sensing capabilities without the need for mechanical buttons. This feature not only enhances user interaction but also contributes to the overall design's robustness and longevity.

In summary, the CY8C24994, CY8C24894, and CY8C24094 PSoC chips offer ample design flexibility with integrated analog and digital functionality, making them an excellent choice for developers aiming to create innovative embedded solutions across a wide range of applications, from consumer electronics to industrial control systems.