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Document Reference No.: FT_000214
MM232R USB - Serial UART Development Module Incorporating Clock Generator
Datasheet Version 1.1
Clearance No.: FTDI# 132
6
Module Configurations
6.1 BUS Powered Configuration
Figure 6.1 Bus Powered Configuration
Figure 7.1 illustrates the MM232R in a typical USB bus powered design configuration. This is done by
connecting pin 15 (USBPWR) to pin 14 (VCC50). Pin 3 (VCCIO), the supply to the FT232RQ?s UART and
CBUS IO pins, is connected to pin 2 (VCC). Doing this will make the UART and CBUS IO pins drive out at 5V
levels. A USB Bus Powered device gets its power from the USB bus. Basic rules for USB Bus power devices
are as follows –
i)
ii)
On plug-in to USB, the device must draw no more than 100mA.
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 PWREN# to
keep the current below 100mA on plug- in and 500μA on USB suspend.
iv) A device that consumes more than 100mA cannot be plugged into a USB Bus Powered Hub.
v) No device can draw more that 500mA from the USB Bus.
The Figure also illustrates interfacing the MM232R module to a microcontroller (MCU) UART interface.
This example uses TXD and RXD for transmission and reception of data, and RTS# / CTS# hardware
handshaking. Also in this example the 12MHz clock output on pin 9 is used to clock the MCU. If the
MCU is handling power management functions, then this can be done by connecting PWREN# to an I/O
pin on the MCU.
? Copyright 2010 Future Technology Devices International Ltd
13
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