CY8C28243_09 Datasheet, PDF (6/65 Pages) Cypress Semiconductor – PSoC Programmable System-on-Chip

PRELIMINARY
CY8C28xxx
System Resources
System Resources, some of which are listed in the previous
sections, provide additional capability useful to complete
systems. Additional resources include a multiplier, multiple
decimators, switch mode pump, low voltage detection, and
power on reset. 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.
■ Multiply accumulate (MAC) provides fast 8-bit multiplier with
32-bit accumulate, to assist in general math and digital filters.
■ Up to four decimators provide custom hardware filters for digital
signal processing applications such as Delta-Sigma ADCs and
CapSense capacitive sensor measurement.
■ Up to two I²C resources provide 0 to 400 kHz communication
over two wires. Slave, master, and multi-master modes are all
supported. I²C resources have hardware address detection
capability.
■ 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 1.3V 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 1.5V battery cell, providing a
low cost boost converter.
PSoC Device Characteristics
There are other PSoC device groups in addition to the one
described in this data sheet. These other PSoC device groups
offer even more resource options. The following table lists the
resources available for specific PSoC device groups. The PSoC
device group covered by this data sheet is highlighted.
Table 1. PSoC Device Characteristics
PSoC Part
Number
CY8C29x66 up to 4 16 12 4
4
12
2K
32K
64
CY8C28xxx
up to
44
up to
3
up to
12
up to
44
up to
4
up to
6
u1p2/4to_[2]
1K
16K
CY8C27x43 up to 2 8 12 4
4
12
256 16K
44
Bytes
CY8C24x94 64 1
4
48 2
2
6
1K
16K
CY8C24x23A up to 1
4
12 2
2
6
24
256 4K
Bytes
CY8C23x33 up to 1
4
12 2
2
4
256 8K
Bytes
CY8C21x34 up to 1
4
28 0
2
4^[3]
512 8K
28
Bytes
CY8C21x23 16 1
4
8
0
2
4^[3]
256 4K
Bytes
CY8C20x34 up to 0
0
28 0
0
3^[4]
512 8K
28
Bytes
The devices covered by this data sheet all have the same archi-
tecture, specifications, and ratings. However, the amount of
some hardware resources varies from device to device within the
group. The following table lists resources available for the
specific device subgroups covered by this data sheet.
Table 2. CY8C28xxx Device Characteristics
PSoC Part
Number
CY8C28x03
CY8C28x13
CY8C28x23
CY8C28x33
CY8C28x43
CY8C28x45
CY8C28x52
N 12 0 0 2 0 up to up to 0
24 8
Y 12 0 4 1 2 up to up to 0
40 40
N 12 6 0 2 2 up to up to 2
44 10
Y 12 6 4 1 4 up to up to 2
40 40
N 12 12 0 2 4 up to up to 4
44 44
Y 12 12 4 2 4 up to up to 4
44 44
Y 8 12 4 1 4 up to up to 4
24 24
Notes
2. Has 12 regular analog blocks and four limited Type-E analog blocks
3. Limited analog functionality.
4. Two analog blocks and one CapSense.
Document Number: 001-48111 Rev. *D
Page 6 of 65
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