Document Number: 001-53754 Rev. *F Page 4 of 50
The Analog System
The analog system is composed of six configurable blocks, each
comprised of an opamp circuit allowing the creation of complex
analog signal flows. Analog peripherals are very flexible and can
be customized to support specific application requirements.
Some of the more common PSoC analog functions (most
available as user modules) are listed below.
■ ADCs (up to two, with 6- to 14-bit resolution, selectable as
incremental, delta-sigma, or successive approximation register
(SAR))
■ Filters (Two- and Four-pole band pass, low pass, and notch)
■ Amplifiers (up to two, with selectable gain to 48x)
■ Instrumentation amplifiers (one with selectable gain to 93x)
■ Comparators (up to two, with 16 selectable thresholds)
■ DACs (up to two, with 6- to 9-bit resolution)
■ Multiplying DACs (up to two, with 6- to 9-bit resolution)
■ High current output drivers (two with 30 mA drive)
■ 1.3-V reference (as a system resource)
■ DTMF Dialer
■ Modulators
■ Correlators
■ Peak Detectors
■ Many other topologies possible
Analog blocks are arranged in a column of three, which includes
one continuous time (CT) and two switched capacitor (SC)
blocks, as shown in Figure 2.
Figure 2. Analog System Block Diagram
The Analog Multiplexer System
The analog mux bus can connect to every GPIO pin in ports 0-5.
Pins are connected to the bus individually or in any combination.
The bus also connects to the analog system for analysis with
comparators and ADCs. It can be split into two sections for simul-
taneous dual-channel processing. An additional 8:1 analog 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
measurement for applications such as touch sensing. Other
multiplexer applications include:
■ Track pad, finger sensing.
■ Chip-wide mux that allows analog input from up to 47 I/O pins.
■ Crosspoint connection between any I/O pin combination.
ACB00 ACB01
Block
Array
Array Input
C on figuration
ACI1[1:0]
ASD20
ACI0[1:0]
P0[6]
P0[4]
P0[2]
P0[0]
P2[2]
P2[0]
P2[6]
P2[4]
RefIn
AGNDIn
P0[7]
P0[5]
P0[3]
P0[1]
P2[3]
P2[1]
Reference
Generators
AGNDIn
R efIn
Bandgap
RefHi
RefLo
AGND
ASD11
ASC21
ASC10
Interface to
Digital System
M8C Interface (Address Bus, Data Bus, Etc.)
Analog Reference
A ll IO
(Except Port 7)
Analog
Mux Bus
(21 Seiten)
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