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| 型號： | FT245BQ |
| 廠商： | Future Technology Devices International Ltd |
| 元件分類： | 微控制器/微處理器 |
| 中文描述： | SPECIALTY MICROPROCESSOR CIRCUIT, QCC32 |
| 封裝： | 5 X 5 MM, LEAD FREE, QFN-32 |
| 文件頁數(shù)： | 8/24頁 |
| 文件大?。?/td> | 995K |
| 代理商： | FT245BQ |
DS245B Version 1.7
Future Technology Devices Intl. Ltd. 2005
Page 16 of 24
FT245BM USB FIFO ( USB - Parallel ) I.C.
7.2 EEPROM Conguration
Figure 6
EEPROM Conguration
Figure 6 illustrates how to connect the FT245BM 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
FT245BM. To prevent potential data clash in this situation,
the Dout of the EEPROM is connected to EEDATA of the
FT245BM via a 2.2 K resistor.
Following a power-on reset or a USB reset, the FT245BM will
scan the EEPROM to nd 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 FT245BM will use the data in
the EEPROM, otherwise it will use its built-in default values.
When a valid command is issued to the EEPROM from the
FT245BM, 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.
There are two varieties of these EEPROM’s on the market – one is congured as being 16 bits wide, the other is
congured as being 8 bits wide. These are available from many sources such as Microchip, ST Micro, ISSI etc. The
FT245BM requires EEPROM’s with a 16-bit wide conguration 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 nd 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 90o so please select the required part and its options carefully.
It is possible to “share” the EEPROM between the FT245BM and another external device such as an MCU. However,
this can only be done when the FT245BM is in its reset condition as it tri-states its EEPROM interface at that time. A
typical conguration would use four bits of an MCU IO Port. One bit would be used to hold the FT245BM reset (using
RESET#) on power-up, the other three would connect to the EECS, EESK and EEDATA pins of the FT245BM 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 FT245BM to congure itself and enumerate over USB.
EECS
EEDATA
32
FT245BM
EESK
1
2
CS
SK
DIN
DOUT
GND
NC
VCC
EEPROM - 93C46 / 56 / 66
1
3
4
5
6
7
8
VCC
10k
2k2
VCC
OBSOLETE
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| FT245BQ-REEL | 功能描述:USB 接口集成電路 USB to Parallel FIFO IC QFN-32 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 |
| FT245R | 制造商:FTDI 制造商全稱:FTDI 功能描述:USB FIFO I.C. Incorporating FTDIChip-ID⑩ Security Dongle |
| FT245R_10 | 制造商:FTDI 制造商全稱:FTDI 功能描述:USB FIFO IC - Single chip USB to parallel FIFO bidirectional data transfer interface |
| FT245RL | 制造商:Future Technology Devices International 功能描述:USB FIFO IC 28-Pin SSOP 制造商:Future Technology Devices International (FTDI Chip) 功能描述:IC USB TO FIFO SMD SSOP28 245 制造商:Future Technology Devices International (FTDI Chip) 功能描述:IC, USB TO FIFO, SMD, SSOP28, 245 制造商:Future Technology Devices International (FTDI Chip) 功能描述:IC, USB FIFO INTERFACE, SSOP-28; USB Type:USB FIFO; USB Version:2.0; Supply Voltage Min:1.8V; Supply Voltage Max:5.25V; Digital IC Case Style:SSOP; No. of Pins:28; Data Rate:1Mbps; No. of Ports:2; Operating Temperature Min:-40C ;RoHS Compliant: Yes |
| FT245RL-2000 | 制造商:FTDI 制造商全稱:FTDI 功能描述:USB FIFO IC - Single chip USB to parallel FIFO bidirectional data transfer interface |
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