CY8C21334_11 Datasheet, PDF (4/37 Pages) Cypress Semiconductor – Automotive PSoC® Programmable System-on-Chip™

CY8C21334, CY8C21534
The Analog System
The Analog System is composed of four configurable blocks,
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 common PSoC
analog functions for this device (most available as user modules)
are listed.
■ ADCs (single or dual, with up to 10-bit resolution)
■ Pin-to-pin comparator
■ Single-ended comparators (up to two) with absolute (1.3 V)
reference or 8-bit DAC reference
■ 1.3 V reference (as a system resource)
In most PSoC devices, analog blocks are provided in columns of
three, which includes one continuous time (CT) and two switched
capacitor (SC) blocks. The CY8C21x34 devices provide limited
functionality Type E analog blocks. Each column contains one
CT Type E block and one SC Type E block. Refer to the PSoC
Programmable System-on-Chip Technical Reference Manual for
detailed information on the CY8C21x34’s Type E analog blocks.
Figure 2. Analog System Block Diagram
From Port 0
Array Input
Configuration
All IO
ACI0[1:0]
ACI1[1:0]
ACOL1MUX
Analog Mux Bus
Array
ACE00
ACE01
The Analog Multiplexer System
The Analog Mux Bus can connect to every GPIO pin. Pins can
be connected to the bus individually or in any combination. The
bus also connects to the analog system for analysis with
comparators and ADCs. 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
continuously 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 any I/O pin.
■ Crosspoint connection between any I/O pin combination.
Additional System Resources
System resources, some of which have been previously listed,
provide additional capability useful for complete systems. Brief
statements describing the merits of each system resource are
presented.
■ 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.
■ The I²C module provides communication up to 400 kHz 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 power-on reset (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.
ASE10
ASE11
Document Number: 001-12550 Rev. *H
Page 4 of 37
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