CY8C24094, CY8C24794

CY8C24894, CY8C24994

When bypassed by a capacitor on P2[4], the noise of the analog ground signal distributed to each block is reduced by a factor of up to 5 (14 dB). This is at frequencies above the corner frequency defined by the on-chip 8.1k resistance and the external capacitor.

Figure 10-4. Typical AGND Noise with P2[4] Bypass

dBV/rtHz

 

 

 

 

 

 

10000

 

 

 

 

 

0

 

 

 

 

 

 

 

 

 

 

 

 

0.01

 

 

 

 

 

 

0.1

 

 

 

 

 

 

1.0

 

 

 

 

 

 

10

1000

 

 

 

 

 

 

100

 

 

 

 

 

 

0.001

0.01

0.1

Freq (kHz)

1

10

100

At low frequencies, the opamp noise is proportional to 1/f, power independent, and determined by device geometry. At high frequencies, increased power level reduces the noise spectrum level.

Figure 10-5. Typical Opamp Noise

nV/rtHz

 

 

 

 

 

 

10000

 

 

 

 

 

PH_BH

 

 

 

 

 

 

 

 

 

 

 

 

PH_BL

 

 

 

 

 

 

PM_BL

 

 

 

 

 

 

PL_BL

1000

 

 

 

 

 

 

100

 

 

 

 

 

 

10

 

 

 

 

 

 

0.001

0.01

0.1

Freq (kHz)

1

10

100

Document Number: 38-12018 Rev. *M

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Cypress CY8C24994, CY8C24094, CY8C24894 manual Typical Agnd Noise with P24 Bypass

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.