參數(shù)資料
型號(hào)： FT2232C
廠商： Electronic Theatre Controls, Inc.
英文描述： FT2232C Dual USB UART / FIFO I.C.
中文描述： FT2232C雙USB的UART / FIFO的集成電路
文件頁(yè)數(shù)： 20/51頁(yè)
文件大?。?/td> 907K
代理商： FT2232C
DS2232C Version 1.4
Future Technology Devices International Ltd. 2005 Page 20 of 54
FT2232C Dual USB UART / FIFO I.C.
8.2 EEPROM Configuration
Figure 7 illustrates how to connect the FT2232C to the
93C46 (93C56 or 93C66) EEPROM. EECS (pin 48) 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 FT2232C. To
prevent potential data clash in this situation, the Dout of the
EEPROM is connected to EEDATA of the FT2232C via a 2.2K
resistor.
VCC
Following a power-on reset or a USB reset, the FT2232C 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 FT2232C will use the data in the
EEPROM, otherwise it will use its built-in default values and
configuration. The default port configuration of the FT2232C
puts both Channel A and Channel B into serial UART mode.
When a valid command is issued to the EEPROM from the
FT2232C, the EEPROM will acknowledge the command by
pulling its 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.
2.2K
EECS
EEDATA
48
FT2232C
EESK
1
2
2
CS
SK
DIN
DOUT
GND
NC
NC
VCC
EEPROM - 93C46 / 56 / 66
1
3
4
5
6
7
8
10K
VCC
Figure 7
EEPROM Configuration
There are two varieties of 93C46/56/66 EEPROM’s 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, STMicro, ISSI etc. The
FT2232C requires EEPROM’s 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 4.35V 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 its options carefully.
It is possible to “share” the EEPROM between the FT2232C and another external device such as an MCU. However,
this can only be done when the FT2232C is in its reset condition as it tri-states its EEPROM interface at that time. A
typical configuration would use four bits of an MCU IO Port. One bit would be used to hold the FT2232C reset (using
RESET#) on power-up, the other three would connect to the EECS, EESK and EEDATA pins of the FT2232C 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 FT2232C to configure itself and enumerate over USB.
The external EEPROM can be programmed over USB using utility software provided by FTDI. The external EEPROM
is used to enable 245 FIFO, CPU-Style FIFO, and Fast Opto-Isolated Serial interface modes on each channel.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
FT2232C_04 制造商:FTDI 制造商全稱:FTDI 功能描述:Dual USB UART / FIFO I.C.
FT2232D 制造商:Future Technology Devices International 功能描述:UART 2-CH 3.3V/5V 48-Pin LQFP 制造商:Future Technology Devices International 功能描述:UART 2-CH 3.3V/5V 48-Pin LQFP Bulk 制造商:Future Technology Devices International (FTDI Chip) 功能描述:USB Full Speed to Dual Channel Serial UART/FIFO/JTAG/SPI/I2C IC - LQFP-48
FT2232D/TR 制造商:Future Technology Devices International (FTDI Chip) 功能描述:USB-UART/FIFO SMD 2232 LQFP48 制造商:Future Technology Devices International (FTDI Chip) 功能描述:USB-UART/FIFO, SMD, 2232, LQFP48 制造商:Future Technology Devices International (FTDI Chip) 功能描述:USB-UART/FIFO, SMD, 2232, LQFP48; USB Type:FIFO; USB Version:2.0; Supply Voltage Min:3V; Supply Voltage Max:5.25V; Digital IC Case Style:LQFP; No. of Pins:48; Data Rate:12Mbps; No. of Ports:2; Operating Temperature Min:-40C ;RoHS Compliant: Yes
FT2232D-REEL 功能描述:USB 接口集成電路 USB to Dual UART/ FIFO/SPI/JTAG/I2C 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
FT2232D-TRAY 制造商:Future Technology Devices International (FTDI Chip) 功能描述:DUAL USB TO SERIAL UART/FIFO IC
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