CY8CTST110
Document Number: 001-46931 Rev. *B
Page 3 of 32
The Analog System
The Analog System consists of four configurable blocks that
allow
the
creation
of
complex
analog
signal
flows.
Implementation of touchscreen applications allow additional
analog resources to be used, depending on the touchscreen
design. Analog peripherals are very flexible and may be
customized to support specific application requirements. Some
of the additional TrueTouch analog functions for this device (most
available as user modules) are:
■ Analog-to-digital converters (single or dual, with 8-bit
resolution)
■ Pin-to-pin comparator
■ Single-ended comparators (up to 2) with absolute (1.3V)
reference or 8-bit DAC reference
■ 1.3V reference (as a System Resource)
Figure 2. Analog System Block Diagram
The Analog Multiplexer System
The Analog Mux Bus connects to every GPIO pin. Pins are
connected to the bus individually or in any combination. The bus
also connects to the analog system for capacitive sensing with
the TrueTouch block comparator. 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 switch dynamically
under hardware control. This allows capacitive measurement for
touchscreen applications. Other multiplexer applications include:
■ Chip-wide mux that allows analog input from any IO pin.
■ Electrical connection between any IO pin combinations.
Additional System Resources
System Resources, some of which are listed in the previous
sections, provide additional capability useful to complete
systems. Additional resources include 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 may 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.
■ Versatile analog multiplexer system.
ACOL1MUX
ACE00
ACE01
Array
Array Input
Configuration
ASE10
ASE11
X
X
X
X
X
AnalogMuxBus
All IO
ACI0[1:0]
ACI1[1:0]
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