CY8CTST200-48LTXIT Cypress Semiconductor Corp, CY8CTST200-48LTXIT Datasheet - Page 85

• Manufacturer Part Number: CY8CTST200-48LTXIT
• Description: IC MCU 32K FLASH 48-QFN
• Manufacturer: Cypress Semiconductor Corp
• Series: TrueTouch™r

Specifications of CY8CTST200-48LTXIT

• Applications: Touchscreen Controller
• Core Processor: M8C
• Program Memory Type: FLASH (32 kB)
• Controller Series: CY8CT
• Ram Size: 2K x 8
• Interface: I²C, SPI, UART/USART, USB
• Number Of I /o: 38
• Voltage - Supply: 1.8 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 48-QFN
• Processor Series: CY8CTxx2xx
• Core: M8C
• Data Bus Width: 8 bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

This chapter presents the TrueTouch Module and its associated registers. For a quick reference of all PSoC registers in
address order, refer to the
11.1
11.1.1
A block diagram of the overall capacitive sensing architec-
ture is shown in
capacitors
approaches use different subsets of this hardware.
Figure 11-1. TrueTouch Module Block Diagram
PSoC CY8CTMG20x and CY8CTST200 TRM, Document No. 001-53603 Rev. *C
Vr
11. TrueTouch Module
IMO
Comparator
IDAC
Reference
Buffer
Clock Select
TrueTouch
Architectural Description
Types of TrueTouch Approaches
being
-
+
TrueTouch Counters
Mux
Mux
Figure
CSCLK
measured.
11-1. CS1 through CSN are the
Register Reference chapter on page
Refs
Oscillator (RO)
Relaxation
The
various
C
C
INTERNAL
EXTERNAL
sensing
CS1
CS2
CSN
187.
11.1.1.1
In the positive charge integration method, charge on a
sense capacitor is integrated onto a larger capacitor, starting
from ground. The number of cycles required to reach a tar-
get voltage gives a measurement of the sensed capaci-
tance. The hardware configuration for this approach is
shown in
either pin P0[1] or P0[3] for the external integration capaci-
tor.
Figure 11-2. Positive Charge Integration Block Diagram
Comparator
Vr
Reference
Buffer
IMO
Figure
CSCLK
Positive Charge Integration
TrueTouch Logic
11-2. The hardware supports the use of
Mux
Mux
Clock Select
TrueTouch
16-Bit Counter
CSCLK
Refs
Pin Enables
CSCLK
s
CS1
CS2
CSN
C
P0[1] or
EXTERNAL
P0[3]
[+] Feedback
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