In general, capacitive touch panels are sometimes more difficult to handle, especially when it's raining, the falling raindrops are very similar to the fingertips, and when wiping the panel with a dry towel, it can also result in a small number of microcontrollers. (MCU) is out of control.
This problem often causes a lot of trouble for applications such as electronic locks (e-locks) that open and close the entrance to the apartment or outdoor security panels. In addition to rain, such applications can be affected by other harsh weather conditions such as high temperatures and humidity. And in some areas, insects and animals such as geckos can cause false touches, and sometimes even certain devices can be disturbed by electrical noise emitted by nearby motors.
About a year ago, a new capacitive touch front end was integrated into the MSP430TM FRAM MCU, creating a single-chip solution for a wide range of capacitive touch applications. This new MCU integrates CapTIvateTM touch technology, which features superior discrimination and recognition, so it can sense storms and successfully eliminate false readings. After all, no one wants to be forced to rain outside the door because of a security lock failure.
The higher sensitivity of CapTIvate touch technology means that system designers can seal touch panels, electrode sensors and other electronic components in thick glass, translucent plastics and even metal materials to isolate moisture while still distinguishing The difference between the water drop and the actual finger touch. CapTIvate technology is very sensitive, not only can measure the capacitance value change as small as 10 fly method and wide dynamic capacitance range up to 300 picofarad, but also sense the touch through 60mm thick glass cover and plastic cover up to 25mm thick And its special protective channel can detect weather changes such as rain, and adjust accordingly according to the specific environment. In addition, the touch software module library can help developers fine-tune the system to cope with environmental changes that may occur in the application and its area.
Of course, some applications, such as electronic locks, are run on battery power, which means low power consumption is indispensable. Other applications, such as security panels located near the motor-driven gate, are sensitive to electrical noise from the power line or motor. In both cases, CapTIvate technology can successfully meet the challenge. MCUs with CapTIvate technology, such as the MSP430FR2633, consume only one-tenth the power of the same MCU, extending the life of the button battery by at least 30%. A Ferroelectric Random Access Memory (FRAM)-based memory architecture provides designers with a large amount of data logging space, such as the entry code used to open a door or gate. Because developers can determine how much space is dedicated to program storage and how much space is used for data storage during configuration, FRAM gives designers more flexibility.
For electrical noise or crosstalk on long leads, this capacitive touch technology features a charge transfer method based on a very robust and integral circuit for measuring capacitance values. In addition, a separate oscillator enables the CapTIvate touch subsystem to perform sampling and frequency hopping to increase the reliability of its measurements. It is worth mentioning that with a 1.5V low-dropout regulator, this capacitive sensor can be driven by 1.5V without the need for higher voltages, so this capacitive sensor has lower electrical noise scattering than other similar MCUs. . With the success in these areas, the MSP430 MCU with CapTIvate technology has passed the technical requirements in the electromagnetic compatibility standards such as IEC6100-4-4, IEC6100-4-6 and IEC6100-4-2.
As a result, designers no longer have to worry about the irretrievable big problem caused by small things like raindrops falling on the touch panel array. Welcome to CapTIvate to view the CapTIvate technology used in the MSP430 MCU.
For more information, please visit:
· Download MSP430FR2633 Microcontroller CapTIvate Electronic Lock and Keypad Reference Design (TIDM-CAPTIVATE-E-LOCK)
· Immediate use of the MSP430 CapTIvate MCU Development Kit
· Read the technical guide to learn more about CapTIvate MCUs
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