CY8C21123, CY8C21223, CY8C21323
Document Number: 38-12022 Rev. *H
Page 3 of 37
Analog System
The Analog System consists of four configurable blocks to allow
creation of complex analog signal flows. Analog peripherals are
very flexible and may be customized to support specific
application requirements. Some of the more common PSoC
analog functions (most available as user modules) are:
■ Analog-to-digital converters (single or dual, with 8-bit
resolution)
■ Pin-to-pin comparators (one)
■ 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 CY8C21x23 devices provide
limited functionality Type “E” analog blocks. Each column
contains one CT block and one SC block.
The number of blocks is on the device family which is detailed in
Table 1.
Figure 2. CY8C21x23 Analog System Block Diagram
Additional System Resources
System Resources, some of which listed in the previous
sections, provide additional capability useful to complete
systems. Additional resources include a switch mode pump, low
voltage detection, and power on reset. Brief statements
describing the merits of each system resource follow.
■ Digital clock dividers provide three customizable clock
frequencies 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
application 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
reference 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. Table 1 lists the resources available for specific
PSoC device groups. The PSoC device covered by this data
sheet is highlighted.
ACOL1MUX
ACE00
ACE01
Array
Array Input
Configuration
ACI0[1:0]
ACI1[1:0]
ASE10
ASE11
Table 1. 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
CY8C24x94
56
1
4
48
2
2
6
1K
16K
CY8C24x23A up to
24
1
4
12
2
2
6
256
Bytes
4K
CY8C21x34
up to
28
1428
0
2
4a
a. Limited analog functionality.
512
Bytes
8K
CY8C21x23
16
1
4
8
0
2
4a
256
Bytes
4K
CY8C20x34
up to
28
0
0
28
0
0
3b
b. Two analog blocks and one CapSense.
512
Bytes
8K
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