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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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FT232BL датащи(PDF) 5 Page - Future Technology Devices International Ltd. |
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FT232BL датащи(HTML) 5 Page - Future Technology Devices International Ltd. |
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5 / 25 page  DS232B Version 1.8 © Future Technology Devices Intl. Ltd. 2005 Page 5 of 25 FT232BM USB UART ( USB - Serial) I.C. x8 Clock Multiplier UART FIFO Controller Serial Interface Engine ( SIE ) USB Protocol Engine Baud Rate Generator UART Dual Port RX Buffer 384 Bytes Dual Port TX Buffer 128 bytes 3.3 Volt LDO Regulator USB Transceiver USB DPLL 6MHZ Oscillator 48MHz 48MHz 12MHz XTIN XTOUT USBDP USBDM 3V3OUT VCC TXD RXD RTS# CTS# DTR# DSR# DCD# RI# EEPROM Interface TXDEN PWREN# PWRCTL TXLED# RXLED# EECS EESK EEDATA SLEEP# RESET# TEST GND RESET GENERATOR RSTOUT# 3V3OUT • 3.3V LDO Regulator The 3.3V LDO Regulator generates the 3.3 volt reference voltage for driving the USB transceiver cell output buffers. It requires an external decoupling capacitor to be attached to the 3V3OUT regulator output pin. It also provides 3.3V power to the RSTOUT# pin. The main function of this block is to power the USB Transceiver and the Reset Generator Cells rather than to power external logic. However, external circuitry requiring 3.3V nominal at a current of not greater than 5mA could also draw its power from the 3V3OUT pin if required. • USB Transceiver The USB Transceiver Cell provides the USB 1.1 / USB 2.0 full-speed physical interface to the USB cable. The output drivers provide 3.3 volt level slew rate control signalling, whilst a differential receiver and two single ended receivers provide USB data in, SEO and USB Reset condition detection. • USB DPLL The USB DPLL cell locks on to the incoming NRZI USB data and provides separate recovered clock and data signals to the SIE block. • 6MHz Oscillator The 6MHz Oscillator cell generates a 6MHz reference clock input to the x8 Clock multiplier from an external 6MHz crystal or ceramic resonator. 3.1 Functional Block Descriptions 3.0 Block Diagram (Simplified) |
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