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Integrated Power-On-Reset (POR) Circuit-
The device incorporates an internal POR function. A RESET# pin is
available in order to allow external logic to reset the FT245R where required. However, for many applications the
RESET# pin can be left unconnected, or pulled up to VCCIO.
Wake Up Function -
If USB is in suspend mode, and remote wake up has been enabled in the internal EEPROM (it is
enabled by default), the RXF# pin becomes an input. Strobing this pin low will cause the FT245R to request a resume
from suspend on the USB bus. Normally this can be used to wake up the host PC from suspend
Lower Operating and Suspend Current -
The device operating supply current has been further reduced to 15mA,
and the suspend current has been reduced to around 70μA. This allows a greater margin for peripherals to meet the
USB suspend current limit of 500μA.
Low USB Bandwidth Consumption -
The operation of the USB interface to the FT245R has been designed to use
as little as possible of the total USB bandwidth available from the USB host controller.
High Output Drive Option -
The parallel FIFO interface and the four FIFO handshake pins can be made to drive
out at three times the standard signal drive level thus allowing multiple devices to be driven, or devices that require a
greater signal drive strength to be interfaced to the FT245R. This option is configured in the internal EEPROM.
Power Management Control for USB Bus Powered, High Current Designs-
The PWREN# signal can be used to
directly drive a transistor or P-Channel MOSFET in applications where power switching of external circuitry is required.
An option in the internal EEPROM makes the device gently pull down on its FIFO interface lines when the power
is shut off (PWREN# is high). In this mode any residual voltage on external circuitry is bled to GND when power is
removed, thus ensuring that external circuitry controlled by PWREN# resets reliably when power is restored.
FTDIChip-ID™ -
Each FT245R is assigned a unique number which is burnt into the device at manufacture. This ID
number cannot be reprogrammed by product manufacturers or end-users. This allows the possibility of using FT245R
based dongles for software licensing. Further to this, a renewable license scheme can be implemented based on the
FTDIChip-ID™ number when encrypted with other information. This encrypted number can be stored in the user area
of the FT245R internal EEPROM, and can be decrypted, then compared with the protected FTDIChip-ID™ to verify
that a license is valid. Web based applications can be used to maintain product licensing this way. An application note
describing this feature is available separately from the
Improved EMI Performance -
The reduced operating current and improved on-chip VCC decoupling significantly
improves the ease of PCB design requirements in order to meet FCC, CE and other EMI related specifications.
Programmable FIFO TX Buffer Timeout -
The FIFO TX buffer timeout is used to flush remaining data from the
receive buffer. This timeout defaults to 16ms, but is programmable over USB in 1ms increments from 1ms to 255ms,
thus allowing the device to be optimised for protocols that require fast response times from short data packets.
Extended Operating Temperature Range -
The FT232R operates over an extended temperature range of -40º to
+85º C thus allowing the device to be used in automotive and industrial applications.
New Package Options -
The FT245R is available in two packages - a compact 28 pin SSOP (
FT245RL)
and an
ultra-compact 5mm x 5mm pinless QFN-32 package (
FT245RQ).
Both packages are lead ( Pb ) free, and use a
‘green’ compound. Both packages are fully compliant with European Union directive 2002/95/EC.
FT245R USB UART I.C. Datasheet Version 1.05
© Future Technology Devices International Ltd. 2005
FTDI [ FUTURE TECHNOLOGY DEVICES INTERNATIONAL LTD. ]
