## FT313HP-R Overview The **FT313HP-R** is a high-speed USB 2.0 Host Controller developed by FTDI (Future Technology Devices International). It is designed to allow embedded systems (such as microcontrollers) to act as a USB Host, enabling them to connect to USB peripherals like flash drives, keyboards, and printers. --- ### 1. Key Technical Specifications The following table summarizes the primary electrical and functional characteristics of the FT313HP-R: | Parameter | Specification | | :--- | :--- | | **USB Standard** | USB 2.0 High Speed (480Mbps) and Full Speed (12Mbps) | | **USB Role** | Enhanced Host Controller Interface (EHCI) | | **Supply Voltage** | 3.3V (with internal 1.2V regulator for core) | | **I/O Voltage** | 1.8V, 2.5V, or 3.3V (Flexible VCCIO) | | **Operating Current** | ~78mA (Active), ~500µA (Suspend) | | **Package Type** | TQFP-64 (The "-R" denotes Tape and Reel) | | **Operating Temp** | -40°C to +85°C (Industrial Grade) | --- ### 2. Major Functional Blocks The internal architecture of the FT313HP-R consists of several critical electronic components: 1. **High-Speed PHY**: The Physical Layer transceiver that handles the high-frequency differential signaling (D+/D-) required for 480Mbps communication. 2. **Memory Buffer**: Includes **24KB of internal SRAM** used for buffering data packets to ensure smooth transfers between the CPU and the USB bus. 3. **CPU Interface**: Supports multiple bus interfaces for the host microcontroller: * SRAM-like asynchronous interface. * 8-bit or 16-bit data bus widths. 4. **Clock Multiplier**: Uses an external 12MHz or 24MHz crystal and an internal PLL to generate the 480MHz clock needed for High-Speed USB. --- ### 3. Pinout Groups and Connectivity The FT313HP-R organizes its 64 pins into specific functional groups: * **USB Interface**: Pins `DP` and `DM` connect directly to the USB connector through small series resistors. * **System Bus**: Pins `D[15:0]` (Data), `A[1:0]` (Address), `CS_N` (Chip Select), `RD_N` (Read), and `WR_N` (Write). * **Interrupts**: The `INT_N` pin notifies the host microcontroller when a USB event (like a device connection or data transfer completion) occurs. * **Power Management**: Dedicated pins for `VCC33` (3.3V input), `VCCIO` (I/O level), and `VOUT12` (Internal regulator output). --- ### 4. Typical Application Circuit When designing with the FT313HP-R, the electronic environment usually requires: * **Decoupling Capacitors**: 0.1µF and 10µF capacitors near every power pin to filter noise. * **Crystal Oscillator**: A stable 12MHz crystal with load capacitors (typically 18-22pF). * **Overcurrent Protection**: An external power switch (like an AP2141) is often paired with the FT313HP to manage the 5V VBUS power supplied to the connected USB peripheral.