SX8678IWLTRT

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Last Time Buy
Touchscreen:	4 or 5 Wire Resistive
Resolution (Bits):	12 b
Interface:	I²C, Serial
Voltage Reference:	Internal
Voltage - Supply:	2.3 V ~ 3.6 V
Current - Supply:	120µA
Operating Temperature:	-40°C ~ 85°C
Mounting Type:	Surface Mount
Package / Case:	20-WFQFN Exposed Pad
Supplier Device Package:	20-QFN (4x4)

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SX8678IWLTRT is a touchscreen controller product type created and marketed by EETI. This product is categorized into the ‘Data Acquisition’, and ‘Touch Screen Controllers’ categories of product types which are specifically designed for the operation of a broad range of consumer and industrial electronics applications. The SX8678IWLTRT is a low-power, single-chip touch-controller solution that is especially designed for embedded systems with advanced human-interface experience. The device consists of 26 nodes placed on a matrix that enables bi-directional serial communication in between the touch controller and host processor. The features of the SX8678IWLTRT are low noise density correlations and rapid response times in both X and Y directions, which extend its usage up to 300Hz of polling rate for its coordinate detection performance. Additionally, it offers excellent linearity and water resistance for both indoor and outdoor operation. It also supports three-finger tracking, noise suppression and drift control for a more pleasant user experience. Furthermore, the SX8678IWLTRT supports four operating modes that can be used depending on the application requirements. The SX8678IWLTRT’s application areas range from general consumer systems, digital home appliances and outdoor outdoor information kiosks to inkjet printers and medical imaging equipment. The device also lends itself well to automotive products, where the features of noise suppression and drift control is of particular advantage. The SX8678IWLTRT is also designed to be paired with an ARM microcontroller (MCU). This device configuration allows for the ARM MCU to read data from onboard FRAM and EEPROM for configuration setup. The ARM MCU also reads the SX8678IWLTRT’s register through I2C interface to extract touch data, and conducts over-sample calculations with collected touch data to increase accuracy of touch coordinates data. The SX8678IWLTRT working principle is based on a process called mutual capacitance. The Product works by using an X and Y axis to measure the changes in the current with in the two axes. In this process two-electrode sensors on the screen’s surface juxtapose two electrodes placed beneath them. When a user touches the screen, the two sets of electrodes sense a change in the current flow, thus allowing them to detect the object coming in contact with the screen. The SX8678IWLTRT also includes some signal conditioning and signal processing operations that improve the accuracy and usability of touch control data. These signal processing operations are done through a microcontroller, and can include noise cancellations and signal enhancement operations. The SX8678IWLTRT also facilitates the transfer of results obtained from the mutual capacitance operations to the ARM MCU, allowing the device to take action accordingly. Additionally, these data can also be sent to a host system for further analysis, or for use in other applications. In summary, the SX8678IWLTRT is a touchscreen controller device type and categorized into the ‘Data Acquisition’ and ‘Touch Screen Controllers’ categories. This product has low noise level correlations and rapid response times in both X and Y directions making it well-suited for applications such as consumer electronics, digital home appliances, and industrial equipment. Its working principle is based on mutual capacitance, which is based on the measurement of changes in current between two sets of electrodes when an object comes in contact with the screen. Additionally, it supports signal conditioning and signal processing operation that contributes to its improved accuracy and usability in various applications.

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