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CY7C64225 Datasheet(PDF) 3 Page - Cypress Semiconductor |
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CY7C64225 Datasheet(HTML) 3 Page - Cypress Semiconductor |
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3 / 19 page  CY7C64225 Document Number: 001-76294 Rev. *B Page 3 of 19 Applications ■ Enable USB connectivity in legacy peripherals with UART ■ Industrial and Metering devices ■ Medical Devices ■ Point of Sales (POS) ■ USB-to-UART cables, USB to RS-232 cables Functional Overview Introduction Cypress’s USB-to-UART bridge controller enables seamless PC connectivity for peripherals with UART interface. It integrates a USB 2.0 Full-Speed device controller, UART, voltage regulator, oscillator and flash memory for storing configuration parameters, offering a cost-effective solution. The controller supports bus-powered and self-powered modes, and enables efficient system power management with suspend and remote wake-up signals. It is available in 28-pin SSOP package. Functional Description USB Interface The USB-to-UART device supports Full-Speed USB operation and is compliant with USB 2.0 Specification. The integrated USB Serial Interface Engine (SIE) and USB transceiver manage the USB protocol and communication. UART Controller The USB-to-UART device integrates a UART controller which supports the baud rates of 300, 600, 1200, 1800, 2400, 3600, 4800, 7200, 9600, 14400, 19200, 28800, 38400, 56000, 57600, 115200 and 230400* with even, odd or no parity. UART Flow Control USB-to-UART device supports UART hardware flow control using control signal pairs such as RTS (Request to Send) - CTS (Clear to Send) and DTR (Data Terminal Ready) - DSR (Data Set Ready). Data flow control is disabled by default. The hardware flow control is optional and can be selected from the host application software. Following is the description of flow control signals: CTS (input): This signal can pause or resume data transmission over UART interface. Data transmission can be stopped by de-asserting the CTS signal and the data transmission can resume with CTS assertion. The pause and resume operation does not affect data integrity. RTS (Output): The receive buffer has a watermark level of 80%. Once the data in the receive buffer reaches that level, the RTS signal is de-asserted indicating the transmitting device to stop data transmission. Start of data consumption by application will reduce device data backlog and once it reaches 50% watermark level, RTS signal will be asserted to resume data reception. DTR / DSR: DTR / DSR signals are used to establish communication link with the UART. These signals complement each other in the functionality like RTS & CTS. Note: Flow control is not supported when operating the device at 230400 Baud rate. In applications where hardware flow control is desired, the CTS, RTS, DSR and DTR pins of the transmitting device have to be connected to RTS, CTS, DTR and DSR pins of USB-to-UART device respectively. In cases where DTR and DSR pins are not available on the transmitting device, the DTR and DSR pins of USB-to-UART device have to be connected. Please refer the circuit diagram shown in Figure 8 (provide hyperlink to figure 8). Suspend and Resume The USB-to-UART device drives the SUSPEND pin to logic low and enters into a low power mode whenever the USB bus goes into suspend state. This helps to meet the stringent suspend current requirement of the USB 2.0 specification, while using the device in bus powered mode. The device will resume from suspend state under any of the following conditions: 1. Any activity is detected on the USB bus 2. WAKE pin is asserted in order to generate Remote Wake-Up to the host. WAKE WAKE pin is used to generate Remote Wake-Up signal on the USB bus. Remote Wake-Up signal is sent only if the host enables this feature through SET_FEATURE request. Support for Remote Wake-Up is intimated to the host from the device through configuration descriptor during the USB enumeration process. USB-to-UART device allows enabling/disabling the Remote Wake-Up feature through the configuration utility CyUsbUart. Reset A logic high on the RESET pin of USB-to-UART device resets the device. Activity Indicators Tx_LED pin and Rx_LED pin are active low and sink a maximum current of 20 mA each. |
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