The **FPT705-190-R** is a specialized electronic component, typically categorized as a **Resistive Touch Panel** (specifically a 5-wire or 4-wire resistive overlay) or a specific **Flat Panel Touch** assembly used in industrial and point-of-sale (POS) systems. Below is a breakdown of the electronic characteristics and specifications associated with this part. --- ### 1. General Specifications The FPT705-190-R is designed to interface between a physical user touch and a controller board. | Feature | Specification | | :--- | :--- | | **Type** | Resistive Touch Screen | | **Active Area** | Approximately 19.0 inches (Diagonal) | | **Interface** | FFC (Flexible Flat Cable) | | **Input Method** | Finger, Pen, or Gloved Hand | | **Transparency** | $\ge 80\%$ | | **Durability** | Typically 10 million to 35 million touches | --- ### 2. Key Electronic Components #### A. The ITO Layers (Indium Tin Oxide) The core electronics consist of two transparent layers coated with Indium Tin Oxide: * **Top Layer (Flexible):** A polyester film that bends when pressed. * **Bottom Layer (Rigid):** Usually glass or hard plastic. * **Operation:** When touched, the two ITO layers make electrical contact, creating a voltage divider that allows the controller to calculate the X and Y coordinates. #### B. The Controller Interface The "R" in the suffix often denotes a specific Revision or Resistive type. The electrical signal is sent via a **Flexible Flat Cable (FFC)**. * **Pinout:** Usually 4-pin or 5-pin. * **Voltage:** Typically operates at low DC voltages (3.3V or 5V) provided by a touch controller board (e.g., ETP-MB-something or similar USB/RS232 controllers). #### C. Spacer Dots These are microscopic non-conductive points between the two layers. Electronically, they act as an "open circuit" preventer, ensuring the layers only connect when physical pressure is applied. --- ### 3. Electrical Characteristics If you are integrating this into a circuit, keep these electrical parameters in mind: | Parameter | Typical Value | | :--- | :--- | | **Insulation Resistance** | $> 20M\Omega$ at 25V DC | | **Linearity** | $< 1.5\%$ | | **Chattering Time** | $< 10ms$ | | **Operating Voltage** | 5V DC (Typical) | --- ### 4. Common Applications Due to the "190" (19-inch) size, this part is found in: 1. **Industrial HMIs:** Human-Machine Interfaces for factory floors. 2. **Kiosks:** Self-service ticketing or information booths. 3. **Medical Monitors:** Where touch reliability with gloves is required.