參數(shù)資料
型號(hào)： FT232BM
廠商： Electronic Theatre Controls, Inc.
英文描述： Generation of FTDI’s Popular USB UART I.C.
中文描述： 在FTDI的流行的USB UART的新一代集成電路
文件頁(yè)數(shù)： 14/24頁(yè)
文件大?。?/td> 812K
代理商： FT232BM
DS232B Version 1.1 Future Technology Devices Intl. Ltd. 2002
Page 14 of 24
FT232BM USB UART ( USB - Serial) I.C.
7.2 EEPROM Configuration
Figure 6
EEProm Configuration
EECS
EEDATA
32
FT232BM
EESK
1
2
2
CS
SK
DIN
DOUT
GND
NC
NC
VCC
EEPROM - 93C46 / 56 / 66
1
3
4
5
6
7
8
VCC
10k
2k2
VCC
Figure 6 illustrates how to connect the FT232BM to the 93C46
( 93C56 or 93C66 ) EEPROM. EECS ( pin 32 ) is directly
connected to the chip select ( CS ) pin of the EEPROM. EESK
( pin 1 ) is directly connected to the clock ( SK ) pin of the
EEPROM. EEDATA ( pin 2 ) is directly connected to the Data
In ( Din ) pin of the EEPROM. There is a potential condition
whereby both the Data Output ( Dout ) of the EEPROM
can drive out at the same time as the EEDATA pin of the
FT232BM. To prevent potential data clash in this situation,
the Dout of the EEPROM is connected to EEDATA of the
FT232BM via a 2k2 resistor.
Following a power-on reset or a USB reset, the FT232BM will
scan the EEPROM to find out a) if an EEPROM is attached
to the Device and b) if the data in the device is valid. If both
of these are the case, then the FT232BM will use the data in
the EEPROM, otherwise it will use it’s built-in default values.
When a valid command is issued to the EEPROM from the
FT232BM, the EEPROM will acknowledge the command by
pulling it’s Dout pin low. In order to check for this condition, it
is necessary to pull Dout high using a 10k resistor. If the command acknowledge doesn’t happen then EEDATA will
be pulled high by the 10k resistor during this part of the cycle and the device will detect an invalid command or no
EEPROM present.
There are two varieties of these EEPROMs on the market – one is configured as being 16 bits wide, the other
is configured as being 8 bits wide. These are available from many sources such as Microchip, ST, SIS etc. The
FT232BM requires EEPROMs with a 16-bit wide configuration such as the Microchip 93LC46B device. The EEPROM
must be capable of reading data at a 1Mb clock rate at a supply voltage of 4.4v to 5.25v. Most available parts are
capable of this.
Check the manufacturers data sheet to find out how to connect pins 6 and 7 of the EEPROM. Some devices specify
these as no-connect, others use them for selecting 8 / 16 bit mode or for test functions. Some other parts have their
pinout rotated by 90
o
so please select the required part and it’s options carefully.
It is possible to “share” the EEPROM between the FT232BM and another external device such as an MCU. However,
this can only be done when the FT232BM is in it’s reset condition as it tri-states it’s EEPROM interface at that time.
A typical configuration would use four bit’s of an MCU IO Port. One bit would be used to hold the FT232BM reset (
using RESET# ) on power-up, the other three would connect to the EECS, EESK and EEDATA pins of the FT232BM
in order to read / write data to the EEPROM at this time. Once the MCU has read / written the EEPROM, it would take
RESET# high to allow the FT232BM to configure itself and enumerate over USB.
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FT232HL-REEL 功能描述:USB 接口集成電路 USB HS to UART/FIFO SPI/JTAG/I2C LQFP-48 RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20
FT232HL-TRAY 功能描述:USB 接口集成電路 USB HS to UART/FIFO SPI/JTAG/I2C LQFP-48 RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20
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