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CY8C21434-24PVX Datasheet(PDF) 3 Page - Cypress Semiconductor

Part # CY8C21434-24PVX
Description  PSoC Mixed-Signal Array
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Manufacturer  CYPRESS [Cypress Semiconductor]
Direct Link  http://www.cypress.com
Logo CYPRESS - Cypress Semiconductor

CY8C21434-24PVX Datasheet(HTML) 3 Page - Cypress Semiconductor

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April 20, 2005
Document No. 38-12025 Rev. *G
3
CY8C21x34 Final Data Sheet
PSoC™ Overview
Analog System Block Diagram
The Analog Multiplexer System
The Analog Mux Bus can connect to every GPIO pin. Pins can
be connected to the bus individually or in any combination. The
bus also connects to the analog system for analysis with com-
parators and analog-to-digital converters. An additional 8:1 ana-
log 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 mea-
surement for applications such as touch sensing. Other
multiplexer applications include:
Track pad, finger sensing.
Chip-wide mux that allows analog input from any IO pin.
Crosspoint connection between any IO pin combinations.
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.
Versatile analog multiplexer system.
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.
ACOL1MUX
ACE00
ACE01
Array
Array Input
Configuration
ASE10
ASE11
X
X
X
X
X
AnalogMuxBus
All IO
ACI0[1:0]
ACI1[1:0]
PSoC Device Characteristics
PSoC Part
Number
CY8C29x66
up to
64
4
16
12
4
4
12
2K
32K
CY8C27x43
up to
44
2
8
12
4
4
12
256
Bytes
16K
CY8C24794
50
1
4
48
2
2
6
1K
16K
CY8C24x23
up to
24
1
4
12
2
2
6
256
Bytes
4K
CY8C24x23A
up to
24
1
4
12
2
2
6
256
Bytes
4K
CY8C21x34
up to
28
1
4
28
0
2
4a
a. Limited analog functionality.
512
Bytes
8K
CY8C21x23
16
1
4
8
0
2
4a
256
Bytes
4K


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