Document Number: 001-53754 Rev. *F Page 5 of 50
Additional System Resources
System resources provide additional capability useful for
complete systems. Additional resources include a multiplier,
decimator, LVD, and power-on reset (POR). Brief statements
describing the merits of each 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 are
generated using digital PSoC blocks as clock dividers.
■ Two multiply accumulates (MACs) provide fast 8-bit multipliers
with 32-bit accumulate, to assist in both general math and
digital filters.
■ The decimator provides a custom hardware filter for digital
signal processing applications including creation of Delta-
Sigma ADCs.
■ The I
2
C module provides 0 to 400 kHz communication over two
wires. Slave, master, and multi-master modes are all
supported.
■ LVD interrupts can signal the application of falling voltage
levels, while the advanced POR circuit eliminates the need for
a system supervisor.
■ An internal 1.3-V voltage reference provides an absolute
reference for the analog system, including ADCs and DACs.
■ Versatile analog multiplexer system.
PSoC Device Characteristics
Depending on your PSoC device characteristics, the digital and analog systems can have varying numbers of digital and analog
blocks. The following table lists the resources available for specific PSoC device groups. The device covered by this datasheet is
shown in the highlighted row of the table.
Table 1. PSoC Device Characteristics
PSoC Part
Number
Digital
I/O
Digital
Rows
Digital
Blocks
Analog
Inputs
Analog
Outputs
Analog
Columns
Analog
Blocks
SRAM
Size
Flash
Size
CY8C29x66
[1]
up to 64 4 16 up to 12 4 4 12 2 K 32 K
CY8C28xxx up to 44 up to 3 up to 12 up to 44 up to 4 up to 6 up to
12 + 4
[2]
1 K 16 K
CY8C27x43 up to 44 2 8 up to 12 4 4 12 256 16 K
CY8C24x94
[1]
up to 56 1 4 up to 48 2 2 6 1 K 16 K
CY8C24x23A
[1]
up to 24 1 4 up to 12 2 2 6 256 4 K
CY8C23x33 up to 26 1 4 up to 12 2 2 4 256 8 K
CY8C22x45
[1]
up to 38 2 8 up to 38 0 4 6
[2]
1 K 16 K
CY8C21x45
[1]
up to 24 1 4 up to 24 0 4 6
[2]
512 8 K
CY8C21x34
[1]
up to 28 1 4 up to 28 0 2 4
[2]
512 8 K
CY8C21x23 up to 16 1 4 up to 8 0 2 4
[2]
256 4 K
CY8C20x34
[1]
up to 28 0 0 up to 28 0 0 3
[2,3]
512 8 K
CY8C20xx6 up to 36 0 0 up to 36 0 0 3
[2,3]
up to 2 K up to 32 K
Notes
1. Automotive qualified devices available in this group.
2. Limited analog functionality.
3. Two analog blocks and one CapSense
®
block.
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