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| 型号： | FT232HL-REEL |
| 厂商： | FTDI, Future Technology Devices International Ltd |
| 文件页数： | 5/65页 |
| 文件大小： | 0K |
| 描述： | IC HS USB TO UART/FIFO 48LQFP |
| 应用说明： | FT1248 Application Note |
| 标准包装： | 1 |
| 通道数： | 1，UART |
| FIFO's： | 4kb |
| 规程： | RS232，RS422，RS485 |
| 电源电压： | 1.62 V ~ 1.98 V，2.97 V ~ 3.63 V |
| 带并行端口： | 是 |
| 带故障启动位检测功能： | 是 |
| 带调制解调器控制功能： | 是 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-LQFP |
| 供应商设备封装： | 48-LQFP（7x7） |
| 包装： | 标准包装 |
| 其它名称： | 768-1101-6 |
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Copyright 2012 Future Technology Devices International Limited
13
Document No.: FT_000288
FT232H SINGLE CHANNEL HI-SPEED USB TO MULTIPURPOSE UART/FIFO IC
Datasheet Version 1.8
Clearance No.: FTDI #199
3.4 ACBUS Signal Option
If the external EEPROM is fitted, the following options can be configured on the CBUS I/O pins using the
software utility FT_PROG which can be downloaded from the FTDI utilities page. CBUS signal options are
common to both package versions of the FT232H. The default configuration is described in section 7.
ACBUS Signal
Option
Available On ACBUS Pin
Description
TXDEN
ACBUS0, ACBUS1, ACBUS2, ACBUS3,
ACBUS4, ACBUS5, ACBUS6, ACBUS8,
ACBUS9
TXDEN = (TTL level). Used with RS485 level converters to
enable the line driver during data transmit. TXDEN is
active from one bit time before the start bit is transmitted
on TXD until the end of the stop bit.
*PWREN#
ACBUS0, ACBUS1, ACBUS2, ACBUS3,
ACBUS4, ACBUS5, ACBUS6, ACBUS8,
ACBUS9
Output is low after the device has been configured by
USB, then high during USB suspend mode. This output can
be used to control power to external logic P-Channel logic
level MOSFET switch. Enable the interface pull-down
option when using the PWREN# in this way.*
TXLED#
ACBUS0, ACBUS1, ACBUS2, ACBUS3,
ACBUS4, ACBUS5, ACBUS6, ACBUS8,
ACBUS9
TXLED = Transmit signalling output. Pulses low when
transmitting data (TXD) to the external device. This can
be connected to an LED.
RXLED#
ACBUS0, ACBUS1, ACBUS2, ACBUS3,
ACBUS4, ACBUS5, ACBUS6, ACBUS8,
ACBUS9
RXLED = Receive signalling output. Pulses low when
receiving data (RXD) from the external device. This can be
connected to an LED.
TX&RXLED#
ACBUS0, ACBUS1, ACBUS2, ACBUS3,
ACBUS4, ACBUS5, ACBUS6, ACBUS8,
ACBUS9
LED drive – pulses low when transmitting or receiving data
from or to the external device. See Section 4.11 for more
details.
SLEEP#
ACBUS0, ACBUS1, ACBUS2, ACBUS3,
ACBUS4, ACBUS5, ACBUS6, ACBUS8,
ACBUS9
Goes low during USB suspend mode. Typically used to
power down an external TTL to RS232 level converter IC
in USB to RS232 converter designs.
**CLK30
ACBUS0, ACBUS5, ACBUS6,ACBUS8,
ACBUS9
30MHz Clock output.
**CLK15
ACBUS0, ACBUS5, ACBUS6,ACBUS8,
ACBUS9
15MHz Clock output.
**CLK7.5
ACBUS0, ACBUS5, ACBUS6,ACBUS8,
ACBUS9
7.5MHz Clock output.
TriSt-PU
ACBUS0, ACBUS1, ACBUS2, ACBUS3,
ACBUS4, ACBUS5, ACBUS6, ACBUS8,
ACBUS9
Input Pull Up
DRIVE 1
ACBUS0, ACBUS5, ACBUS6,ACBUS8,
ACBUS9
Output High
DRIVE 0
ACBUS0, ACBUS1, ACBUS2, ACBUS3,
ACBUS4, ACBUS5, ACBUS6, ACBUS8,
ACBUS9
Output Low
I/O mode
ACBUS5, ACBUS6,ACBUS8, ACBUS9
ACBUS BitBang
Table 3.5 ACBUS Configuration Control
* Must be used with a 10kΩ resistor pull up.
**When in USB suspend mode the outputs clocks are also suspended.
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