Datasheet > FT245BQ

FT245BQ

更新时间： 2024-02-13 20:42:31

品牌	Logo	应用领域
飞特帝亚 - FTDI		先进先出芯片
页数	文件大小	规格书
24页	557K
描述
USB FIFO ( USB - Parallel ) I.C.

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技术参数
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FT245BQ 技术参数

是否Rohs认证：	符合	生命周期：	Active
包装说明：	,	Reach Compliance Code：	compliant
风险等级：	5.81	Base Number Matches：	1

FT245BQ 数据手册

FT245BQ USB FIFO ( USB - Parallel ) I.C.

power is removed thus ensuring that external

circuitry controlled by PWREN# resets reliably

when power is restored. PWREN# can also be

used by external circuitry to determine when USB

is in suspend mode (PWREN# goes high).

programmable over USB in 1ms increments

from 1ms to 255ms, thus allowing the device to

be better optimised for protocols requiring faster

response times from short data packets.

•

Relaxed VCC Decoupling

•

Send Immediate / WakeUp (SI / WU) signal

The new Send Immediate / WakeUp signal

combines two functions on a single pin. If USB is

in suspend mode (and remote wakeup is enabled

in the EEPROM), strobing this pin low will cause

the device to request a resume from suspend

(WakeUp) on the USB Bus. Normally, this can

be used to wake up the Host PC. During normal

operation, if this pin is strobed low any data in the

device RX buffer will be sent out over USB on the

next Bulk-IN request from the drivers regardless of

the packet size. This can be used to optimise USB

transfer speed for some applications.

The 2^ndgeneration devices now incorporate a level

of on-chip VCC decoupling. Though this does

not eliminate the need for external decoupling

capacitors, it signiﬁcantly improves the ease of

PCB design requirements to meet FCC, CE and

other EMI related speciﬁcations.

•

Bit Bang Mode

The 2^ndgeneration device has a new option

referred to as “Bit Bang” mode. In Bit Bang mode,

the eight FIFO data lines can be switched between

FIFO interface mode and an 8-bit Parallel IO

port. Data packets can be sent to the device and

they will be sequentially sent to the interface at

a rate controlled by an internal timer (equivalent

to the prescaler of the FT232BQ device). As well

as allowing the device to be used stand-alone

as a general purpose IO controller for example

controlling lights, relays and switches, some other

interesting possibilities exist. For instance, it may

be possible to connect the device to an SRAM

conﬁgurable FPGA as supplied by vendors such as

Altera and Xilinx. The FPGA device would normally

be un-conﬁgured (i.e. have no deﬁned function) at

power-up. Application software on the PC could

use Bit Bang Mode to download conﬁguration

data to the FPGA which would deﬁne its hardware

function, then after the FPGA device is conﬁgured

the FT245BQ can switch back into FIFO interface

mode to allow the programmed FPGA device

to communicate with the PC over USB. This

approach allows a customer to create a “generic”

USB peripheral who’s hardware function can be

deﬁned under control of the application software.

The FPGA based hardware can be easily upgraded

•

Lower Suspend Current

Integration of RCCLK within the device and internal

design improvements reduce the suspend current

of the FT245BQ to under 100uA typical (excluding

the 1.5K pull-up on USBDP) in USB suspend

mode. This allows greater margin for peripherals to

meet the USB Suspend current limit of 500uA.

•

Support for USB Isochronous Transfers

Whilst USB Bulk transfer is usually the best

choice for data transfer, the scheduling time of the

data is not guaranteed. For applications where

scheduling latency takes priority over data integrity

such as transferring audio and low bandwidth

video data, the new device now offers an option of

USB Isochronous transfer via an option bit in the

EEPROM.

•

Programmable FIFO TX Buffer Timeout

In the previous device, the TX buffer timeout

used to ﬂush remaining data from the TX buffer

was ﬁxed at 16ms timeout. This timeout is now

DS245BQ Version 1.7

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与FT245BQ相关器件

型号	品牌	获取价格	描述	数据表
FT245R	FTDI	获取价格	USB FIFO I.C. Incorporating FTDIChip-ID⑩ Secu
FT245R_10	FTDI	获取价格	USB FIFO IC - Single chip USB to parallel FIFO bidirectional data transfer interface
FT245RL	FTDI	获取价格	Bit Bang Modes for the FT232R and FT245R
FT245RL-2000	FTDI	获取价格	USB FIFO IC - Single chip USB to parallel FIFO bidirectional data transfer interface
FT245RQ	FTDI	获取价格	Bit Bang Modes for the FT232R and FT245R
FT245RQ-6000	FTDI	获取价格	USB FIFO IC - Single chip USB to parallel FIFO bidirectional data transfer interface
FT24C02A	ETC	获取价格	Two-Wire Serial EEPROM
FT24C02A-5DG-B	ETC	获取价格	The FT24C02A is 2048 bits of serial Electrical Erasable and Programmable Read Only Memory,
FT24C02A-5DR-B	ETC	获取价格	The FT24C02A is 2048 bits of serial Electrical Erasable and Programmable Read Only Memory,
FT24C02A-5LG-T	ETC	获取价格	The FT24C02A is 2048 bits of serial Electrical Erasable and Programmable Read Only Memory,

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