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

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