FT232R USB UART IC：未来科技设备国际有限公司的数据手册
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"FT232R USB UART IC的 datasheet，版本2.09，由Future Technology Devices International Ltd.发布，包含了关于这款USB到串行UART接口芯片的详细技术规格和特性。"
FT232R是Future Technology Devices International Ltd（FTDI）推出的一款单芯片USB到串行数据传输接口集成电路。这款芯片设计独特，集成了多种高级功能，极大地简化了USB设备的设计和开发过程。
1. **USB协议处理**：FT232R能够完全处理USB协议，意味着在设计中无需编写特定的USB固件程序，降低了开发难度。
2. **集成EEPROM**：内置1024位EEPROM，用于存储设备描述符和CBUS I/O配置信息，方便了设备配置和识别。
3. **USB终端电阻**：芯片内含完整的USB终止电阻，确保了USB连接的稳定性。
4. **时钟发生器**：内部集成时钟生成器，无需外部晶体，同时提供可选的时钟输出选择，便于与外部MCU或FPGA实现无胶合（glue-less）接口。
5. **数据传输速率**：支持从300波特到3兆波特（RS422、RS485、RS232）的数据传输速率，在TTL电平下操作。
6. **缓冲区技术**：128字节接收缓冲区和256字节发送缓冲区，采用缓冲平滑技术，提高了数据吞吐量。
7. **驱动支持**：FTDI提供的免版税Virtual Com Port (VCP)和Direct (D2XX)驱动程序，大多数情况下消除了开发USB驱动程序的需求，简化了系统集成。
8. **唯一芯片ID**：具备独特的USB FTDI Chip-ID™特性，有助于设备的识别和管理。
9. **配置灵活性**：该芯片具有高度的配置灵活性，可以适应各种不同的应用需求。
FT232R芯片广泛应用于需要USB接口的串行通信场合，如嵌入式系统、工业控制、数据采集、测试设备等。其简易的接口和强大的功能使得它成为开发者在设计USB到串行转换应用时的理想选择。
Copyright © 2010 Future Technology Devices International Limited 8
Document No.: FT_000053
FT232R USB UART IC Datasheet Version 2.09
Clearance No.: FTDI# 38
Pin No.
Name
Type
Description
17
3V3OUT
Output
+3.3V output from integrated LDO regulator. This pin should be decoupled to
ground using a 100nF capacitor. The main use of this pin is to provide the internal
+3.3V supply to the USB transceiver cell and the internal 1.5kΩ pull up resistor on
USBDP. Up to 50mA can be drawn from this pin to power external logic if
required. This pin can also be used to supply the VCCIO pin.
20
VCC
PWR
+3.3V to +5.25V supply to the device core. (see Note 1)
25
AGND
PWR
Device analogue ground supply for internal clock multiplier
Table 3.2 Power and Ground Group
Pin No.
Name
Type
Description
8, 24
NC
NC
No internal connection
19
RESET#
Input
Active low reset pin. This can be used by an external device to reset the
FT232R. If not required can be left unconnected, or pulled up to VCC.
26
TEST
Input
Puts the device into IC test mode. Must be tied to GND for normal
operation, otherwise the device will appear to fail.
27
OSCI
Input
Input 12MHz Oscillator Cell. Optional – Can be left unconnected for
normal operation. (see Note 2)
28
OSCO
Output
Output from 12MHZ Oscillator Cell. Optional – Can be left unconnected
for normal operation if internal Oscillator is used. (see Note 2)
Table 3.3 Miscellaneous Signal Group
Pin No.
Name
Type
Description
1
TXD
Output
Transmit Asynchronous Data Output.
2
DTR#
Output
Data Terminal Ready Control Output / Handshake Signal.
3
RTS#
Output
Request to Send Control Output / Handshake Signal.
5
RXD
Input
Receiving Asynchronous Data Input.
6
RI#
Input
Ring Indicator Control Input. When remote wake up is enabled in the
internal EEPROM taking RI# low (20ms active low pulse) can be used to
resume the PC USB host controller from suspend.
9
DSR#
Input
Data Set Ready Control Input / Handshake Signal.
10
DCD#
Input
Data Carrier Detect Control Input.
11
CTS#
Input
Clear To Send Control Input / Handshake Signal.
12
CBUS4
I/O
Configurable CBUS output only Pin. Function of this pin is configured in
the device internal EEPROM. Factory default configuration is SLEEP#. See
CBUS Signal Options, Table 3.9.
13
CBUS2
I/O
Configurable CBUS I/O Pin. Function of this pin is configured in the
device internal EEPROM. Factory default configuration is TXDEN. See
CBUS Signal Options, Table 3.9.
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