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FT232R Datasheet(PDF) 19 Page - Future Technology Devices International Ltd. |
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FT232R Datasheet(HTML) 19 Page - Future Technology Devices International Ltd. |
19 / 29 page FT232R USB UART I.C. Datasheet Version 1.04 © Future Technology Devices International Ltd. 2005 Page 19 7. Device Configurations Please note that pin numbers on the FT232R chip in this section have deliberately been left out as they vary between the FT232RL and FT232RQ versions of the device. All of these configurations apply to both package options for the FT232R device. Please refer to Section 4 for the package option pin-out and signal descriptions. 7.1 Bus Powered Configuration Figure 11 - Bus Powered Configuration Figure 11 illustrates the FT232R in a typical USB bus powered design configuration. A USB Bus Powered device gets its power from the USB bus. Basic rules for USB Bus power devices are as follows – i) On plug-in to USB, the device must draw no more than 100mA. ii) On USB Suspend the device must draw no more than 500μA. iii) A Bus Powered High Power USB Device (one that draws more than 100mA) should use one of the CBUS pins configured as PWREN# and use it to keep the current below 100mA on plug-in and 500μA on USB suspend. iv) A device that consumes more than 100mA can not be plugged into a USB Bus Powered Hub. v) No device can draw more that 500mA from the USB Bus. The power descriptor in the internal EEPROM should be programmed to match the current draw of the device. A Ferrite Bead is connected in series with USB power to prevent noise from the device and associated circuitry (EMI) being radiated down the USB cable to the Host. The value of the Ferrite Bead depends on the total current required by the circuit – a suitable range of Ferrite Beads is available from Steward (www.steward.com) for example Steward Part # MI0805K400R-00. FT232R A G N D G N D G N D G N D T E S T 100nF 3V3OUT VCCIO NC RESET# NC + 100nF 10nF Vcc TXD RXD RTS# CTS# DTR# DSR# DCD# RI# CBUS0 CBUS3 CBUS2 CBUS1 USBDP USBDM VCC 1 2 3 4 5 OSCI OSCO CBUS4 Ferrite Bead + 4.7uF SHIELD GND GND GND GND Vcc |
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Similar Description - FT232R |
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