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FT232BL Datasheet(PDF) 3 Page - Future Technology Devices International Ltd. |
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FT232BL Datasheet(HTML) 3 Page - Future Technology Devices International Ltd. |
3 / 25 page DS232B Version 1.8 © Future Technology Devices Intl. Ltd. 2005 Page 3 of 25 FT232BM USB UART ( USB - Serial) I.C. • Programmable Receive Buffer Timeout In the previous device, the receive buffer timeout used to flush remaining data from the receive buffer was fixed at 16ms timeout. This timeout is now 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. • TXDEN Timing fix TXDEN timing has now been fixed to remove the external delay that was previously required for RS485 applications at high baud rates. TXDEN now works correctly during a transmit send-break condition. • Relaxed VCC Decoupling The 2nd generation 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. • Improved PreScaler Granularity The previous version of the Prescaler supported division by (n + 0), (n + 0.125), (n + 0.25) and (n + 0.5) where n is an integer between 2 and 16,384 (214). To this we have added (n + 0.375), (n + 0.625), (n + 0.75) and (n+ 0.875) which can be used to improve the accuracy of some baud rates and generate new baud rates which were previously impossible (especially with higher baud rates). • Bit Bang Mode The 2nd generation device has a new option referred to as “Bit Bang” mode. In Bit Bang mode, the eight UART interface control lines can be switched between UART 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 the prescaler setting. 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 FT232BM can switch back into UART 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 or totally changed simply by changing the FPGA configuration data file. Application notes, software and development modules for this application area will be available from FTDI and other 3rd parties. • PreScaler Divide By 1 Fix The previous device had a problem when the integer part of the divisor was set to 1. In the 2nd generation device setting the prescaler value to 1 gives a baud rate of 2 million baud and setting it to zero gives a baud rate of 3 million baud. Non- integer division is not supported with divisor values of 0 and 1. |
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