參數(shù)資料
型號(hào)： FT232RQ-REEL
廠商： FTDI, Future Technology Devices International Ltd
文件頁(yè)數(shù)： 16/43頁(yè)
文件大?。?/td> 0K
描述： IC USB FS SERIAL UART 32-QFN
產(chǎn)品培訓(xùn)模塊： USB Introduction
USB-UART Interface Solutions
標(biāo)準(zhǔn)包裝： 1
系列： USBmadeEZ-UART
特點(diǎn)： USB 至 UART
通道數(shù)： 1，UART
FIFO's： 256 字節(jié)
規(guī)程： RS232，RS422，RS485
電源電壓： 3.3 V ~ 5.25 V
帶自動(dòng)流量控制功能： 是
帶調(diào)制解調(diào)器控制功能： 是
帶CMOS： 是
安裝類型： 表面貼裝
封裝/外殼： 32-VFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 32-QFN 裸露焊盤（5x5）
包裝： 標(biāo)準(zhǔn)包裝
產(chǎn)品目錄頁(yè)面： 634 (CN2011-ZH PDF)
配用： 768-1023-ND - MOD USB RS232 DEV/EVAL FT232RL
768-1022-ND - MOD USB UART MINI B DEV FT232R
768-1021-ND - MOD USB UART MINI DEV FT232R
768-1019-ND - MOD USB UART DEV FT232R
其它名稱： 768-1008-6
Copyright 2010 Future Technology Devices International Limited
23
Document No.: FT_000053
FT232R USB UART IC Datasheet Version 2.10
Clearance No.: FTDI# 38
6 USB Power Configurations
The following sections illustrate possible USB power configurations for the FT232R. The illustrations have
omitted pin numbers for ease of understanding since the pins differ between the FT232RL and FT232RQ
package options.
All USB power configurations illustrated apply to both package options for the FT232R device. Please refer
to Section 3 for the package option pin-out and signal descriptions.
6.1 USB Bus Powered Configuration
Figure 6.1 Bus Powered Configuration
Figure 6.1 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 should draw no more current than 100mA.
ii)
In USB Suspend mode the device should draw no more than 2.5mA.
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 2.5mA 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 than 500mA from the USB bus.
The power descriptors in the internal EEPROM of the FT232R should be programmed to match the current
drawn by the device.
A ferrite bead is connected in series with the USB power supply to reduce EMI noise from the FT232R and
associated circuitry being radiated down the USB cable to the USB host. The value of the Ferrite Bead
depends on the total current drawn by the application. A suitable range of Ferrite Beads is available from
Steward (www.steward.com), for example Steward Part # MI0805K400R-10.
Note: If using PWREN# (available using the CBUS) the pin should be pulled to VCCIO using a 10kΩ
resistor.
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
Vcc
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