TCA8418EYFPR Integrated Circuits (ICs)

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The TCA8418EYFPR is a low-voltage, low-power keypad controller and encoder intended to provide a complete multiplexed scanning solution for up to a 32-key electrical matrix keypad. By integrating the entire scanning process into a single chip, the TCA8418EYFPR eliminates the need for external power control and RC circuits, saving significant space on the host device’s PCB. The TCA8418EYFPR is especially suited to applications such as industrial control and monitoring, automotive/medical systems, and mobile handheld devices.

The TCA8418EYFPR is a 32-key matrix keypad encoder which offers two data outputs for input to a microcontroller, including four column pins, three row pins, and an output status pin. The encoder is designed to provide a complete multiplexed scanning solution for a 32-key electrical matrix keypad with an additional barcode input. The encoder integrated inside the TCA8418EYFPR can scan for up to 32 keys, with no noise and low power consumption. When a key is depressed, a row is read from the keypad. The encoder stays in the active state until the output status pin is pulled high, which signals that a key has been depressed.

The TCA8418EYFPR includes multiple operating modes to enable various features of the keypad. It features an adjustable column response time to reduce ghosting, and an adjustable row response time to extend the dynamic range of the keypad. A key count function allows the encoder to determine the number of keys in use, and an auto-repeat function allows long key press events to be reported as repeated events. The TCA8418EYFPR is also compatible with barcode scanners, and a barcode output mode is available.

The working principle of TCA8418EYFPR is based on a standard matrix keypad scanning technique. The encoder scans a matrix keypad by driving external column pins and reading external row pins. When a key is depressed, a row is read from the keypad. The encoder stays in the active state until the output status pin is pulled high, which signals that a key has been depressed. The encoder then determines which column pin the row corresponds to and outputs the code for that particular key on the key code output (KCO) pin. The encoder then stores the code in its register, so a multiple key presses can be debounced and accumulated together.

The TCA8418EYFPR is also equipped with an advanced Auto-Repeat/Lock-out function, which allows for the key press event to repeat for some period of time upon a single key push. This is useful for applications such as volume control, where a single key press produces repeated events for a set interval. Similarly, the Key Count function can be used to detect the total number of keys being used in the keypad and program their codes, making the TCA8418EYFPR a very user-friendly encoder with a wide range of applications.

Overall, the TCA8418EYFPR is an ideal choice for low-power applications that require low-voltage operation, high integration, and efficient signal encoding. The multiple operating modes make it an ideal choice for many industrial, automotive, and medical applications. Furthermore, the advanced features such as auto-repeat, lock-out, and key count offer further enhancements to the already powerful TCA8418EYFPR. It is a great choice for low-power, low-cost applications with multiplexed scanning requirements.

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