CY8C24633
Document Number: 001-20160 Rev. *B
Page 4 of 35
Figure 2. Analog System Block Diagram
Additional System Resources
System Resources, some of which have been previously listed,
provide additional capability useful to complete systems.
Additional resources include a multiplier, decimator, 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
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.
■ A multiply accumulate (MAC) provides a fast 8-bit multiplier
with 32-bit accumulate, to assist in both general math as well
as digital filters.
■ The decimator provides a custom hardware filter for digital
signal processing applications including the creation of Delta
Sigma ADCs.
■ 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 1.3V reference provides an absolute reference for
the analog system, including ADCs and DACs.
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
3 analog blocks. The following table lists the resources available
for specific PSoC device groups.
ACB00
ACB01
Block Array
Array Input Configuration
ACI1[1:0]
ACI0[1:0]
P0[6]
P0[4]
P0[2]
P0[0]
P2[2]
P2[0]
P2[6]
P2[4]
P0[7]
P0[5]
P0[3]
P0[1]
P2[3]
P2[1]
Reference
Generators
AGNDIn
RefIn
Bandgap
RefHi
RefLo
AGND
ASD11
ASC21
Interface to
Digital System
M8C Interface (Address Bus, Data Bus, Etc.)
Analog Reference
8-Bit SAR ADC
ACI2[3:0]
P0[7:0]
Table 1. PSoC Device Characteristics
PSoC Part
Number
CY8C29x66
up to
64
4
16
12
4
4
12
No
CY8C27x43
up to
44
2
8
12
4
4
12
No
CY8C24x94
56
1
4
48
2
2
6
No
CY8C24633
up to
25
1
4
12
2
2
4
Yes
CY8C24x23A
up to
24
1
4
12
226
No
CY8C21x34
up to
28
14
28
0
2
4[1]
No
CY8C21x23
16
1
4
8
0
2
4[1]
No
CY8C20x34
up to
28
0
0
28
0
0
3[2]
No
Notes
1. Limited analog functionality
.
2. Two analog blocks and one CapSense®.
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