Cypress Semiconductor Perform CY8C21x23 User Manual download pdf (Page 3)

February 25, 2005 Document No. 38-12022 Rev. *G 3

CY8C21x23 Final Data Sheet PSoC™ Overview

Analog System Block Diagram, CY8C21x23

Additional System Resources

System Resources, some of which have been previously listed,

provide additional capability useful to complete systems. Addi-

tional resources include a switch mode pump, low voltage

detection, and power on reset. Brief statements describing the

merits of each system resource are presented below.

■ Digital clock dividers provide three customizable clock fre-

quencies for use in applications. The clocks can be routed to

both the digital and analog systems. Additional clocks can be

generated using digital PSoC blocks as clock dividers.

■ The I2C module provides 100 and 400 kHz communication

over two wires. Slave, master, and multi-master modes are

all supported.

■ Low Voltage Detection (LVD) interrupts can signal the appli-

cation of falling voltage levels, while the advanced POR

(Power On Reset) circuit eliminates the need for a system

supervisor.

■ An internal 1.3 voltage reference provides an absolute refer-

ence for the analog system, including ADCs and DACs.

■ An integrated switch mode pump (SMP) generates normal

operating voltages from a single 1.2V battery cell, providing a

low cost boost converter.

PSoC Device Characteristics

Depending on your PSoC device characteristics, the digital and

analog systems can have 16, 8, or 4 digital blocks and 12, 6, or

4 analog blocks. The following table lists the resources

available for specific PSoC device groups. The PSoC device

covered by this data sheet is highlighted below.

AC OL 1M U X

ACE00 ACE01

Array

Array Input

Configuration

ACI0[1:0] ACI1[1:0]

ASE10 ASE11

PSoC Device Characteristics

PSoC Device

Group

Digital IO (Max)

Digital Rows

Digital Blocks

Analog Inputs

Analog Outputs

Analog Columns

Analog Blocks

Amount of SRAM

Amount of Flash

CY8C29x66 64 4 16 12 4 4 12 2K 32K

CY8C27x43 44 2 8 12 4 4 12 256 Bytes 16K

CY8C24794 56 1 4 48 2 2 6 1K 16K

CY8C24x23A 24 1 4 12 2 2 6 256 Bytes 4K

CY8C24x23 24 1 4 12 2 2 6 256 Bytes 4K

CY8C21x34 28 1 4 28 0 2

a. Limited analog functionality.

512 Bytes 8K

CY8C21x23 16 1 4 8 0 2

256 Bytes 4K

1 2 3 4 5 6 7 8 ... 32 33

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