Cypress 公司的CY3209-ExpressEVK开发套件包括Express评估板,5V LCD模块, MiniProg编程单元, USB 电缆以及2个Artaflex 2.4GHz 无线电和9V电源等软件,硬件和案例几部分,主要用来评估PSoC特别是PSoC Express器件.套件分成四个部分,每个部分分别对应CY8C21434, CY8C27643, CY8C24894和CY8C29666器件,可以实现和评估CapSense,无线通信, “拖拽”(Drag and drop)USB,LCD控制,加速度/倾斜/下落检测以及电压监视等功能.本文介绍了CY8C21x34 PSoC器件的主要特性,方框图, 数字系统方框图和模拟系统方框图以及CY3209-ExpressEVK 评估板的主要特性和详细电路图.

The PSoC® family consists of many Mixed-Signal Array with On-Chip Controller devices. These devices are designed to replace multiple traditional MCU-based system omponents
with one, low cost single-chip programmable component. A PSoC device includes configurable blocks of analog and digital logic, as well as programmable interconnect. This architecture allows the user to create customized peripheral configurations, to match the requirements of each individual application. Additionally, a fast CPU, Flash program memory, SRAM data memory, and configurable IO are included in a range of convenient
pinouts.

The PSoC architecture, as illustrated on the left, is comprised of four main areas: the Core, the System Resources, the Digital System, and the Analog System. Configurable global bus resources allow all the device resources to be combined into a complete custom system. Each CY8C21x34 PSoC device includes four digital blocks and four analog blocks. Depending on the PSoC package, up to 28 general purpose IO (GPIO) are also included. The GPIO provide access to the global digital and analog interconnects.



图1. CY8C21434方框图
The PSoC Core
The PSoC Core is a powerful engine that supports a rich instruction set. It encompasses SRAM for data storage, an interrupt controller, sleep and watchdog timers, and IMO (internal main oscillator) and ILO (internal low speed oscillator). The CPU core, called the M8C, is a powerful processor with speeds up to 24 MHz. The M8C is a four MIPS 8-bit Harvard architecture microprocessor.

System Resources provide additional capability, such as digital clocks to increase the flexibility of the PSoC mixed-signal arrays, I2C functionality for implementing an I2C master, slave, MultiMaster, an internal voltage reference that provides an absolute value of 1.3V to a number of PSoC subsystems, a switch mode pump (SMP) that generates normal operating voltages off a single battery cell, and various system resets supported
by the M8C.

The Digital System is composed of an array of digital PSoC blocks, which can be configured into any number of digital peripherals. The digital blocks can be connected to the GPIO through a series of global buses that can route any signal to any pin. Freeing designs from the constraints of a fixed peripheral controller.
The Analog System is composed of four analog PSoC blocks, supporting comparators and analog-to-digital conversion up to 8 bits in precision.

The Digital System
The Digital System is composed of 4 digital PSoC blocks. Each block is an 8-bit resource that can be used alone or combined with other blocks to form 8, 16, 24, and 32-bit peripherals, which are called user module references. Digital peripheral configurations
include those listed below.

■PWMs (8 to 32 bit)
■PWMs with Dead band (8 to 32 bit)
■Counters (8 to 32 bit)
■Timers (8 to 32 bit)
■UART 8 bit with selectable parity
■SPI master and slave
■I2C slave and multi-master
■Cyclical Redundancy Checker/Generator (8 to 32 bit)
■IrDA
■Pseudo Random Sequence Generators (8 to 32 bit)
The digital blocks can be connected to any GPIO through a series of global buses that can route any signal to any pin. The buses also allow for signal multiplexing and for performing logic operations. This configurability frees your designs from the constraints of a fixed peripheral controller. Digital blocks are provided in rows of four, where the number of
blocks varies by PSoC device family. This allows you the optimum choice of system resources for your application.



图2. CY8C21434中的数字系统方框图

The Analog System
The Analog System is composed of 4 configurable blocks, 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 common PSoC analog functions for this device (most available as user modules) are listed below.

■Analog-to-digital converters (single or dual, with 8-bit resolution)
■Pin-to-pin comparator
■Single-ended comparators (up to 2) with absolute (1.3V) reference or 8-bit DAC reference
■1.3V reference (as a System Resource)
In most PSoC devices, analog blocks are provided in columns of three, which includes one CT (Continuous Time) and two SC (Switched Capacitor) blocks. The CY8C21x34 devices provide limited functionality Type “E” analog blocks. Each column contains
one CT Type E block and one SC Type E block. Refer to the PSoC Mixed-Signal Array Technical Reference Manual for detailed information on the CY8C21x34’s Type E analog blocks.



图3. CY8C21434中的模拟系统方框图CY8C21434主要特性:

■Powerful Harvard Architecture Processor
M8C Processor Speeds to 24 MHz
Low Power at High Speed
2.4V to 5.25V Operating Voltage
Operating Voltages Down to 1.0V Using On-Chip Switch Mode Pump (SMP)
Industrial Temperature Range: -40°C to +85°C
■Advanced Peripherals (PSoC Blocks)
4 Analog Type “E” PSoC Blocks Provide:
-2 Comparators with DAC Refs
-Single or Dual 8-Bit 28 Channel ADC
4 Digital PSoC Blocks Provide:
-8- to 32-Bit Timers, Counters, and PWMs
-CRC and PRS Modules
-Full-Duplex UART, SPI™ Master or Slave
-Connectable to All GPIO Pins
Complex Peripherals by Combining Blocks
■Flexible On-Chip Memory
8K Flash Program Storage 50,000 Erase/Write Cycles
512 Bytes SRAM Data Storage
In-System Serial Programming (ISSP)
Partial Flash Updates
Flexible Protection Modes
EEPROM Emulation in Flash
■Complete Development Tools
Free Development Software (PSoC Designer™)
Full-Featured, In-Circuit Emulator and Programmer
Full Speed Emulation
Complex Breakpoint Structure
128K Trace Memory
■Precision, Programmable Clocking
Internal ±2.5% 24/48 MHz Oscillator
Internal Oscillator for Watchdog and Sleep
Programmable Pin Configurations
25 mA Drive on All GPIO
Pull Up, Pull Down, High Z, Strong, or Open Drain Drive Modes on All GPIO
Up to 8 Analog Inputs on GPIO
Configurable Interrupt on All GPIO
Versatile Analog Mux
Common Internal Analog Bus
Simultaneous Connection of IO Combinations
Capacitive Sensing Application Capability
Additional System Resources
I2C™ Master, Slave and Multi-Master to 400 kHz
Watchdog and Sleep Timers
User-Configurable Low Voltage Detection
Integrated Supervisory Circuit
On-Chip Precision Voltage Reference
CY3209-ExpressEVK Kit
CY3209-ExpressEVK Kit Contents:
Express Evaluation Board
5V LCD Module
MiniProg Programming Unit
USB Cable
2 Artaflex 2.4GHz Radios
9V Battery
CY3209-ExpressEVK Kit CD
Quick Start
Hardware Description
The CY3209-ExpressEVK development kit allows one to put real-world applications together very quickly. This new kit demonstrates many aspects of  PSoC with special emphasis on PSoC Express. The kit is physically divided into 4 parts, with each part associated with the CY8C21434, CY8C27643, CY8C24894 and CY8C29666 devices respectively. PSoCs can be I2C networked. The CY3209-ExpressEVK contains an enhanced version of the PSoC Express World Tour board (CY3121-Customer.) The kit includes software, hardware and example projects to help designers learn how to implement and evaluate the following functions:

CapSense
Wireless Communication
Drag and drop USB
LCD Control
Accelerometer/Tilt/Drop Sensing
Voltage Monitoring
Key Applications:
Some of the applications possible with this kit are demonstrated in the Users Manual for the kit, where the user is led step-by-step, through several projects, including:
Capacitive button sensing
Analog input and display of a remote display using I2C
Display of a dynamically changing real-time analog value on an LCD
Implement a PC interface via USB
Special-effects with LEDs
CY3209-ExpressEVK 评估板电路图



图4. CY3209-ExpressEVK 评估板电路图(1)



图5. CY3209-ExpressEVK 评估板电路图(2)



图6. CY3209-ExpressEVK 评估板电路图(3)



图7. CY3209-ExpressEVK 评估板电路图(4)

  来源：Cypress