FT240X USB 8-BIT FIFO IC Datasheet Version 1.3 Document No.: FT_000626 Clearance No.: FTDI# 259 Future Technology Devices International Ltd. FT240X (USB 8-BIT FIFO IC) The FT240X is a USB to parallel FIFO interface with the following advanced features: USB Battery Charger Detection. Allows for USB peripheral devices to detect the presence of a higher power source to enable improved charging. Device supplied pre-programmed with unique USB serial number. USB Power Configurations; supports bus- powered, self-powered and bus-powered with power switching. Integrated +3.3V level converter for USB I/O. True 3.3V CMOS drive output and TTL input; operates down to 1V8 with external pull-ups. Tolerant of 5V input. Configurable I/O pin output drive strength; 4 mA(min) and 16 mA(max). Integrated power-on-reset circuit. Fully integrated AVCC supply filtering - no external filtering required. +5V Single Supply Operation. FTDI’s royalty-free Virtual Com Port (VCP) and Direct (D2XX) drivers eliminate the requirement for USB driver development in most cases. Internal 3V3/1V8 LDO regulators Low operating and USB suspend current; 8mA (active-typ) and 125uA (suspend-typ). Configurable FIFO interface I/O pins. UHCI/OHCI/EHCI host controller compatible. Synchronous and asynchronous bit bang interface options. USB 2.0 Full Speed capable. Extended operating temperature range; -40 to 85⁰C. Available in compact Pb-free 24 Pin SSOP and QFN24 packages (both RoHS compliant). Single chip USB to parallel FIFO bidirectional data transfer interface. Entire USB protocol handled on the chip. No USB specific firmware programming required. Fully integrated 2048 byte multi-timeprogrammable (MTP) memory, storing device descriptors and FIFO I/O configuration. Fully integrated clock generation with no external crystal required plus optional clock output selection enabling glue-less interface to external MCU or FPGA. Data transfer rates up to 1Mbyte / second. 512 byte receive buffer and 512 byte transmit buffer utilising buffer smoothing technology to allow for high data throughput. Neither the whole nor any part of the information contained in, or the product described in this manual, may be adapted or reproduced in any material or electronic form without the prior written consent of the copyright holder. This product and its documentation are supplied on an as-is basis and no warranty as to their suitability for any particular purpose is either made or implied. Future Technology Devices International Ltd will not accept any claim for damages howsoever arising as a result of use or failure of this product. Your statutory rights are not affected. This product or any variant of it is not intended for use in any medical appliance, device or system in which the failure of the product might reasonably be expected to result in personal injury. This document provides preliminary information that may be subject to change without notice. No freedom to use patents or other intellectual property rights is implied by the publication of this document. Future Technology Devices International Ltd, Unit 1, 2 Seaward Place, Centurion Business Park, Glasgow G41 1HH United Kingdom. Scotland Registered Company Number: SC136640 Copyright © 2013 Future Technology Devices International Limited 1 FT240X USB 8-BIT FIFO IC Datasheet Version 1.3 Document No.: FT_000626 Clearance No.: FTDI# 259 1 Typical Applications Upgrading Legacy Peripherals to USB USB Industrial Control Utilising USB to add system modularity USB MP3 Player Interface Incorporate USB interface to enable PC transfers for development system communication USB FLASH Card Reader and Writers Set Top Box PC - USB interface USB Digital Camera Interface USB Software and Hardware Encryption Dongles USB Instrumentation Cellular and Cordless Phone USB data transfer cables and interfaces Interfacing MCU/PLD/FPGA based designs to USB USB Audio and Low Bandwidth Video data transfer USB dongle implementations for Software/ Hardware Encryption and Wireless Modules USB Smart Card Readers Provides detection of dedicated charging ports for charging batteries in portable devices. 1.1 Driver Support Royalty free VIRTUAL COM PORT (VCP) DRIVERS for... Royalty free D2XX Direct Drivers (USB Drivers + DLL S/W Interface) Windows 8 32,64-bit Windows 8 32,64-bit Windows 7 32,64-bit Windows 7 32,64-bit Windows Vista and Vista 64-bit Windows Vista and Vista 64-bit Windows XP and XP 64-bit Windows XP and XP 64-bit Windows XP Embedded Windows XP Embedded Server 2003, XP and Server 2008 Server 2003, XP and Server 2008 Windows CE 4.2, 5.0 and 6.0 Windows CE 4.2, 5.0 and 6.0 Mac OS-X Mac OS-X Linux 3.2 and greater Linux 2.6 and greater Android Android The drivers listed above are all available to download for free from FTDI website (www.ftdichip.com). Various 3rd party drivers are also available for other operating systems - see FTDI website (www.ftdichip.com) for details. For driver installation, please refer to the application note AN232B-10. For driver installation, please refer to http://www.ftdichip.com/Documents/InstallGuides.htm 1.2 Part Numbers Part Number Package FT240XQ-x 24 Pin QFN FT240XS-x 24 Pin SSOP Note: Packaging codes for x is: -R: Taped and Reel, (SSOP is 3,000pcs per reel, QFN is 5,000pcs per reel). - U: Tube packing, 58pcs per tube (SSOP only) - T: Tray packing, 490pcs per tray (QFN only) For example: FT240XQ-R is 5,000pcs taped and reel packing Copyright © 2013 Future Technology Devices International Limited 2 FT240X USB 8-BIT FIFO IC Datasheet Version 1.3 Document No.: FT_000626 Clearance No.: FTDI# 259 1.3 USB Compliant The FT240X is fully compliant with the USB 2.0 specification and has been given the USB-IF Test-ID (TID) 40001466 (Rev D). Copyright © 2013 Future Technology Devices International Limited 3 FT240X USB 8-BIT FIFO IC Datasheet Version 1.3 Document No.: FT_000626 Clearance No.: FTDI# 259 2 FT240X Block Diagram VCC 1V8 Internal Core Supply 3V3OUT USBDP USBDM 3.3 Volt LDO Regulator USB Transceiver with Integrated 1.5k pullups and battery charge detection 1.8 Volt LDO Regulator FIFO RX Buffer (512 bytes) Serial Interface Engine (SIE) VCCIO DATA[0] DATA[1] DATA[2] DATA[3] DATA[4] DATA[5] DATA[6] DATA[7] USB Protocol Engine FIFO Interface Controller Internal MTP Memory RXF# TXE# RD# WR SIWUA CBUS5 CBUS6 USB DPLL FIFO TX Buffer (512 bytes) Internal 12MHz Oscillator 3V3OUT RESET# X4 Clock Multiplier Reset Generator 48MHz To USB Transceiver Cell GND Figure 2.1 FT240X Block Diagram For a description of each function please refer to Section 4. Copyright © 2013 Future Technology Devices International Limited 4 FT240X USB 8-BIT FIFO IC Datasheet Version 1.3 Document No.: FT_000626 Clearance No.: FTDI# 259 Table of Contents 1 Typical Applications ...................................................................... 2 1.1 Driver Support .................................................................................... 2 1.2 Part Numbers...................................................................................... 2 1.3 USB Compliant .................................................................................... 3 2 FT240X Block Diagram ................................................................. 4 3 Device Pin Out and Signal Description .......................................... 7 3.1 24-LD SSOP Package .......................................................................... 7 3.2 SSOP Package Pin Out Description...................................................... 7 3.3 QFN-24 Package ................................................................................. 9 3.4 QFN-24 Package Signal Description .................................................... 9 3.5 CBUS Signal Options ......................................................................... 11 3.6 FT240X FIFO READ Timing Diagrams ................................................ 12 3.7 FT240X FIFO WRITE Timing Diagrams .............................................. 13 4 Function Description................................................................... 14 4.1 Key Features ..................................................................................... 14 4.2 Functional Block Descriptions ........................................................... 15 5 Devices Characteristics and Ratings ........................................... 16 5.1 Absolute Maximum Ratings............................................................... 16 5.2 ESD and Latch-up Specifications ....................................................... 16 5.3 DC Characteristics............................................................................. 17 5.4 MTP Memory Reliability Characteristics ............................................ 21 5.5 Internal Clock Characteristics ........................................................... 21 6 USB Power Configurations .......................................................... 22 6.1 USB Bus Powered Configuration ...................................................... 22 6.2 Self Powered Configuration .............................................................. 23 6.3 USB Bus Powered with Power Switching Configuration .................... 24 7 Application Examples ................................................................. 25 7.1 USB to MCU FIFO Interface ............................................................... 25 7.2 Battery Charge Detection .................................................................. 26 8 Internal MTP Memory Configuration ........................................... 28 8.1 Default Values .................................................................................. 28 8.2 Methods of Programming the MTP Memory ....................................... 29 8.2.1 8.3 9 Programming the MTP memory over USB ...................................................................... 29 Memory Map ..................................................................................... 30 Package Parameters ................................................................... 31 Copyright © 2013 Future Technology Devices International Limited 5 FT240X USB 8-BIT FIFO IC Datasheet Version 1.3 Document No.: FT_000626 Clearance No.: FTDI# 259 9.1 SSOP-24 Package Mechanical Dimensions ........................................ 31 9.2 SSOP-24 Package Markings .............................................................. 32 9.3 QFN-24 Package Mechanical Dimensions .......................................... 33 9.4 QFN-24 Package Markings ................................................................ 34 9.5 Solder Reflow Profile ........................................................................ 35 10 Contact Information ................................................................... 36 Appendix A - References ............................................................................ 37 Appendix B - List of Figures and Tables ..................................................... 38 Appendix C - Revision History .................................................................... 40 Copyright © 2013 Future Technology Devices International Limited 6 FT240X USB 8-BIT FIFO IC Datasheet Version 1.3 Document No.: FT_000626 Clearance No.: FTDI# 259 3 Device Pin Out and Signal Description RESET# 6 GND 16 USBDM USBDP GND 14 13 3V3OUT DATA0 DATA1 DATA2 DATA3 DATA4 DATA5 DATA6 DATA7 RXF# TXE# RD# WR# SI/WU# CBUS5 CBUS6 24 4 2 9 1 7 8 5 21 20 11 12 10 23 22 19 15 VCC VCORE VCCIO 18 17 3 3.1 24-LD SSOP Package Figure 3.1 SSOP Package Pin Out and Schematic Symbol 3.2 SSOP Package Pin Out Description Note: The convention used throughout this document for active low signals is the signal name followed by a# Pin No. Name Type Description 13 USBDP I/O USB Data Signal Plus, incorporating 1.5kΩ pull up resistor to 3.3V. 14 USBDM I/O USB Data Signal Minus. Table 3.1 USB Interface Group Pin No. Name Type Description 3 VCCIO PWR 1V8 - 3V3 supply for the IO cells 6, 19 GND PWR Device ground supply pins 15 18 17 ** 3V3OUT ** VCC VCORE 3V3 output at 50mA. May be used to power VCCIO. Output When VCC is 3V3; pin 15 is an input pin and should be connected to pin 18. PWR +5V (or 3V3) supply to the device core. PWR +1V8 Output. May be left unterminated Table 3.2 Power and Ground Group ** If VCC is 3V3 then 3V3OUT must also be driven with 3V3 input Copyright © 2013 Future Technology Devices International Limited 7 FT240X USB 8-BIT FIFO IC Datasheet Version 1.3 Document No.: FT_000626 Clearance No.: FTDI# 259 Pin No. Name Type Description 16 RESET# Input Active low reset pin. This can be used by an external device to reset the FT240X. If not required can be left unconnected, or pulled up to VCC. 10 SIWU# Input Active low input. May be used to flush the IC buffer back to the PC (Send Immediate) or if the PC is in suspend mode it can be used as a Wake Up signal. 23 CBUS5 I/O Configurable CBUS I/O Pin. Function of this pin is configured in the device MTP memory. See CBUS Signal Options, Table 3.9. 22 CBUS6 I/O Configurable CBUS I/O Pin. Function of this pin is configured in the device MTP memory. See CBUS Signal Options, Table 3.9. Table 3.3 Miscellaneous Signal Group Pin No. Name Type Description 24 D0 I/O FIFO Data Bus Bit 0 4 D1 I/O FIFO Data Bus Bit 1 2 D2 I/O FIFO Data Bus Bit 2 9 D3 I/O FIFO Data Bus Bit 3 1 D4 I/O FIFO Data Bus Bit 4 7 D5 I/O FIFO Data Bus Bit 5 8 D6 I/O FIFO Data Bus Bit 6 5 D7 I/O FIFO Data Bus Bit 7 11 RD# Input Enables the current FIFO data byte on D0...D7 when low. Fetched the next FIFO data byte (if available) from the receive FIFO buffer when RD# goes from high to low. See Section 3.6 for timing diagram. 12 WR Input Writes the data byte on the D0...D7 pins into the transmit FIFO buffer when WR goes from high to low. See Section 3.7 for timing diagram. 20 TXE# Output When high, do not write data into the FIFO. When low, data can be written into the FIFO by strobing WR high, then low. During reset this signal pin is tri-state. See Section 3.7 for timing diagram. When high, do not read data from the FIFO. When low, there is data available in the FIFO which can be read by strobing RD# low, then high again. During reset this signal pin is tri-state. See Section 3.6 for timing diagram. 21 RXF# Output If the Remote Wakeup option is enabled in the internal MTP memory, during USB suspend mode (PWREN# = 1) RXF# becomes an input. This can be used to wake up the USB host from suspend mode by strobing this pin low for a minimum of 20ms which will cause the device to request a resume on the USB bus. Table 3.4 FIFO Interface Group (see note 2) Notes: When used in Input Mode, the input pins are pulled to VCCIO via internal 200kΩ resistors. These pins can be programmed to gently pull low during USB suspend (PWREN# = “1”) by setting an option in the internal MTP memory. Copyright © 2013 Future Technology Devices International Limited 8 FT240X USB 8-BIT FIFO IC Datasheet Version 1.3 Document No.: FT_000626 Clearance No.: FTDI# 259 QFN-24 Package 12 VCC VCORE VCCIO 15 14 24 3.3 3V3OUT 11 10 USBDM USBDP 13 18 17 8 9 7 20 19 RXF# TXE# RD# WR# SI/WU# CBUS5 CBUS6 3 16 25 GND GND GND RESET# 21 1 23 6 22 4 5 2 DATA0 DATA1 DATA2 DATA3 DATA4 DATA5 DATA6 DATA7 Figure 3.2 QFN-24 Package Pin Out and schematic symbol 3.4 QFN-24 Package Signal Description Note: The convention used throughout this document for active low signals is the signal name followed by a# Pin No. Name Type Description 10 USBDP I/O USB Data Signal Plus, incorporating 1.5kΩ pull up resistor to 3.3V. 11 USBDM I/O USB Data Signal Minus. Table 3.5 USB Interface Group Pin No. Name Type Description 24 VCCIO PWR 1V8 - 3V3 supply for the IO cells 3, 16 GND PWR Device ground supply pins 12 15 14 ** 3V3OUT ** VCC VCORE 3V3 output at 50mA. May be used to power VCCIO. Output When VCC is 3V3; pin 12 is an input pin and should be connected to pin 15. PWR +5V (or 3V3) supply to the device core. PWR +1V8 Output. May be left unterminated Table 3.6 Power and Ground Group *Pin 25 is the centre pad on package base. Connect to GND. **If VCC is 3V3 then 3V3OUT must also be driven with 3V3 input Copyright © 2013 Future Technology Devices International Limited 9 FT240X USB 8-BIT FIFO IC Datasheet Version 1.3 Document No.: FT_000626 Clearance No.: FTDI# 259 Pin No. Name Type Description 13 RESET# Input Active low reset pin. This can be used by an external device to reset the FT240X. If not required can be left unconnected, or pulled up to VCC. 7 SIWU# Input Active low input. May be used to flush the IC buffer back to the PC (Send Immediate) or if the PC is in suspend mode it can be used as a Wake Up signal. 20 CBUS5 I/O Configurable CBUS I/O Pin. Function of this pin is configured in the device MTP memory. See CBUS Signal Options, Table 3.9. 19 CBUS6 I/O Configurable CBUS I/O Pin. Function of this pin is configured in the device MTP memory. See CBUS Signal Options, Table 3.9. Table 3.7 Miscellaneous Signal Group Pin No. Name Type Description 21 D0 I/O FIFO Data Bus Bit 0 1 D1 I/O FIFO Data Bus Bit 1 23 D2 I/O FIFO Data Bus Bit 2 6 D3 I/O FIFO Data Bus Bit 3 22 D4 I/O FIFO Data Bus Bit 4 4 D5 I/O FIFO Data Bus Bit 5 5 D6 I/O FIFO Data Bus Bit 6 2 D7 I/O FIFO Data Bus Bit 7 8 RD# Input Enables the current FIFO data byte on D0...D7 when low. Fetched the next FIFO data byte (if available) from the receive FIFO buffer when RD# goes from high to low. See Section 3.6 for timing diagram. 9 WR Input Writes the data byte on the D0...D7 pins into the transmit FIFO buffer when WR goes from high to low. See Section 3.7 for timing diagram. 17 TXE# Output When high, do not write data into the FIFO. When low, data can be written into the FIFO by strobing WR high, then low. During reset this signal pin is tri-state. See Section 3.7 for timing diagram. When high, do not read data from the FIFO. When low, there is data available in the FIFO which can be read by strobing RD# low, then high again. During reset this signal pin is tri-state. See Section 3.6 for timing diagram. 18 RXF# Output If the Remote Wakeup option is enabled in the internal MTP memory, during USB suspend mode (PWREN# = 1) RXF# becomes an input. This can be used to wake up the USB host from suspend mode by strobing this pin low for a minimum of 20ms which will cause the device to request a resume on the USB bus. Table 3.8 FIFO Interface Group (see note 2) Notes: When used in Input Mode, the input pins are pulled to VCCIO via internal 200kΩ resistors. These pins can be programmed to gently pull low during USB suspend (PWREN# = “1”) by setting an option in the internal MTP memory. Copyright © 2013 Future Technology Devices International Limited 10 FT240X USB 8-BIT FIFO IC Datasheet Version 1.3 Document No.: FT_000626 Clearance No.: FTDI# 259 3.5 CBUS Signal Options The following options can be configured on the CBUS I/O pins. CBUS signal options are common to both package versions of the FT240X. These options can be configured in the internal MTP memory using the software utility FT_PPROG, which can be downloaded from the FTDI Utilities (www.ftdichip.com). The default configuration is described in Section 8. CBUS Signal Option Available On CBUS Pin TRI-STATE CBUS5, CBUS6 IO Pad is tri-stated DRIVE 1 CBUS5, CBUS6 Output a constant 1 DRIVE 0 CBUS5, CBUS6 Output a constant 0 PWREN# CBUS5, CBUS6 Output is low after the device has been configured by USB, then high during USB suspend mode. This output can be used to control power to external logic P-Channel logic level MOSFET switch. Enable the interface pull-down option when using the PWREN# in this way. SLEEP# CBUS5, CBUS6 Goes low during USB suspend mode. Typically used to power down an external TTL to RS232 level converter IC in USB to RS232 converter designs. CLK24MHz CBUS5, CBUS6 24 MHz Clock output.* CLK12MHz CBUS5, CBUS6 12 MHz Clock output.* CLK6MHz CBUS5, CBUS6 6 MHz Clock output.* BCD Charger CBUS5, CBUS6 Battery charge Detect, indicates when the device is connected to a dedicated battery charger host. Active high output. BCD Charger# CBUS5, CBUS6 Inverse of BCD Charger BitBang_WR# CBUS5, CBUS6 Synchronous and asynchronous bit bang mode WR# strobe output. BitBang_RD# CBUS5, CBUS6 Synchronous and asynchronous bit bang mode RD# strobe output. VBUS Sense CBUS5, CBUS6 Input to detect when VBUS is present. Time Stamp CBUS5, CBUS6 Toggle signal which changes state each time a USB SOF is received Keep_Awake# CBUS5, CBUS6 Prevents the device from entering suspend state when unplugged. Description Table 3.9 CBUS Configuration Control *When in USB suspend mode the outputs clocks are also suspended. Copyright © 2013 Future Technology Devices International Limited 11 FT240X USB 8-BIT FIFO IC Datasheet Version 1.3 Document No.: FT_000626 Clearance No.: FTDI# 259 3.6 FT240X FIFO READ Timing Diagrams T6 T5 RXF# T2 T1 RD# T4 T3 D[7...0] Valid Data Figure 3.3 FIFO Read Cycle Time Description Minimum Maximum Unit T1 RD# Active Pulse Width 50 - ns T2 RD# to RD# Pre-Charge Time 50 + T6 - ns T3 RD# Active to Valid Data* 20 50 ns T4 Valid Data Hold Time from RD# Inactive* 0 - ns T5 RD# Inactive to RXF# 0 25 ns T6 RXF# Inactive After RD Cycle 80 - ns Table 3.10 FIFO Read Cycle Timings *Load = 30pF Copyright © 2013 Future Technology Devices International Limited 12 FT240X USB 8-BIT FIFO IC Datasheet Version 1.3 Document No.: FT_000626 Clearance No.: FTDI# 259 3.7 FT240X FIFO WRITE Timing Diagrams T12 T11 TXE# T8 T7 WR T9 D[7...0] T10 Valid Data Figure 3.4 FIFO Write Cycle Time Description Minimum Maximum Unit T7 WR Active Pulse Width 50 - ns T8 WR to WR Pre-Charge Time 50 - ns T9 Valid data setup to WR falling edge* 20 - ns T10 Valid Data Hold Time from WR Inactive* 0 - ns T11 WR Inactive to TXE# 5 25 ns T12 TXE# Inactive After WR Cycle 80 - ns Table 3.11 FIFO Write Cycle *Load = 30pF Copyright © 2013 Future Technology Devices International Limited 13 FT240X USB 8-BIT FIFO IC Datasheet Version 1.3 Document No.: FT_000626 Clearance No.: FTDI# 259 4 Function Description The FT240X is a USB to parallel FIFO interface device which simplifies USB implementations and reduces external component count by fully integrating into the device an MTP memory and an integrated clock circuit which requires no external crystal. It has been designed to operate efficiently with USB host controllers by using as little bandwidth as possible when compared to the total USB bandwidth available. 4.1 Key Features Functional Integration. Fully integrated MTP memory, clock generation, AVCC filtering, power-on-reset (POR) and LDO regulator. Configurable CBUS I/O Pin Options. The fully integrated MTP memory allows configuration of the Control Bus (CBUS) functionality and drive strength selection. There are 2 configurable CBUS I/O options. The configurable options are defined in section 3.5. The CBUS lines can be configured with any one of these output options by setting bits in the internal MTP memory. The device is shipped with the most commonly used pin definitions pre-programmed - see Section 8 for details. Asynchronous Bit Bang Mode. In asynchronous bit-bang mode, the eight FIFO lines can be switched from the regular interface mode to an 8-bit general purpose I/O 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 baud rate pre-scaler. This option will be described more fully in a separate application note available from FTDI website (www.ftdichip.com). Synchronous Bit Bang Mode. The FT240X supports synchronous bit bang mode. This mode differs from asynchronous bit bang mode in that the interface pins are only read when the device is written to. This makes it easier for the controlling program to measure the response to an output stimulus as the data returned is synchronous to the output data. An application note, AN232R-01, available from FTDI website (www.ftdichip.com) describes this feature. 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 FT240X. This option is configured in the internal MTP memory. Programmable FIFO RX Buffer Timeout. The FIFO RX 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 2ms to 255ms, thus allowing the device to be optimised for protocols that require fast response times from short data packets. Wake Up Function. If USB is in suspend mode, and remote wake up has been enabled in the internal MTP memory (it is enabled by default). Strobing the SIWU# pin low for a minimum of 20ms will cause the FT240X to request a resume from suspend on the USB bus. Normally this can be used to wake up the host PC from suspend. Source Power and Power Consumption. The FT240X is capable of operating at a voltage supply between +3.3V and +5.25V with a nominal operational mode current of 8mA and a nominal USB suspend mode current of 125µA. This allows greater margin for peripheral designs to meet the USB suspend mode current limit of 2.5mA. An integrated level converter within allows the FT240X to interface to logic running at +1.8V to +3.3V (5V tolerant). Copyright © 2013 Future Technology Devices International Limited 14 FT240X USB 8-BIT FIFO IC Datasheet Version 1.3 Document No.: FT_000626 Clearance No.: FTDI# 259 4.2 Functional Block Descriptions The following paragraphs detail each function within the FT240X. Please refer to the block diagram shown in Figure 2.1. Internal MTP Memory. The internal MTP memory in the FT240X is used to store USB Vendor ID (VID), Product ID (PID), device serial number, product description string and various other USB configuration descriptors. The FT240X is supplied with the internal MTP memory pre-programmed as described in Section 8. A user area of the internal MTP memory is available to system designers to allow storing additional data from the user application over USB. The internal MTP memory descriptors can be programmed in circuit, over USB without any additional voltage requirement. The descriptors can be programmed using the FTDI utility software called FT_PROG, which can be downloaded from FTDI Utilities on the FTDI website (www.ftdichip.com). +1.8V LDO Regulator. The +1.8 LDO regulator generates the +1.8V reference voltage for driving the internal core of the IC. +3.3V LDO Regulator. The +3.3V LDO regulator generates the +3.3V reference voltage for driving the USB transceiver cell output buffers. It requires an external decoupling capacitor to be attached to the 3V3OUT regulator output pin. It also provides +3.3V power to the 1.5kΩ internal pull up resistor on USBDP. The main function of the LDO is to power the USB Transceiver and the Reset Generator Cells rather than to power external logic. However, it can be used to supply external circuitry requiring a +3.3V nominal supply with a maximum current of 50mA. USB Transceiver. The USB Transceiver Cell provides the USB 1.1 / USB 2.0 full-speed physical interface to the USB cable. The output drivers provide +3.3V level slew rate control signalling, whilst a differential input receiver and two single ended input receivers provide USB data in, Single-Ended-0 (SE0) and USB reset detection conditions respectfully. This function also incorporates a 1.5kΩ pull up resistor on USBDP. The block also detects when connected to a USB power supply which will not enumerate the device but still supply power and may be used for battery charging. USB DPLL. The USB DPLL cell locks on to the incoming NRZI USB data and generates recovered clock and data signals for the Serial Interface Engine (SIE) block. Internal 12MHz Oscillator. The Internal 12MHz Oscillator cell generates a 12MHz reference clock. This provides an input to the x4 Clock Multiplier function. The 12MHz Oscillator is also used as the reference clock for the SIE, USB Protocol Engine and FIFO controller blocks. Clock Multiplier / Divider. The Clock Multiplier / Divider takes the 12MHz input from the Internal Oscillator function and generates the 48MHz. The 48Mz clock reference is used by the USB DPLL and the Baud Rate Generator blocks. Serial Interface Engine (SIE). The Serial Interface Engine (SIE) block performs the parallel to serial and serial to parallel conversion of the USB data. In accordance with the USB 2.0 specification, it performs bit stuffing/un-stuffing and CRC5/CRC16 generation. It also verifies the CRC on the USB data stream. USB Protocol Engine. The USB Protocol Engine manages the data stream from the device USB control endpoint. It handles the low level USB protocol requests generated by the USB host controller and the commands for controlling the functional parameters of the FIFO in accordance with the USB 2.0 specification Section 9. FIFO RX Buffer (512 bytes). Data sent from the USB host controller to the FIFO via the USB data OUT endpoint is stored in the FIFO RX (receive) buffer and is removed from the buffer by reading the contents of the FIFO using the RD# pin. (Rx relative to the USB interface). FIFO TX Buffer (512 bytes). Data written into the FIFO using the WR pin is stored in the FIFO TX (transmit) Buffer. The USB host controller removes data from the FIFO TX Buffer by sending a USB request for data from the device data IN endpoint. (Tx relative to the USB interface). FIFO Controller with Programmable High Drive. The FIFO Controller handles the transfer of data between the FIFO RX, the FIFO TX buffers and the external FIFO interface pins (D0 - D7). Additionally, the FIFO signals have a configurable high drive strength capability which is configurable in the MTP memory. RESET Generator. The integrated Reset Generator Cell provides a reliable power-on reset to the device internal circuitry at power up. The RESET# input pin allows an external device to reset the FT240X. RESET# can be tied to VCC or left unconnected if not being used. Copyright © 2013 Future Technology Devices International Limited 15 FT240X USB 8-BIT FIFO IC Datasheet Version 1.3 Document No.: FT_000626 Clearance No.: FTDI# 259 5 Devices Characteristics and Ratings 5.1 Absolute Maximum Ratings The absolute maximum ratings for the FT240X devices are as follows. These are in accordance with the Absolute Maximum Rating System (IEC 60134). Exceeding these may cause permanent damage to the device. Parameter Value Unit Storage Temperature -65°C to 150°C Degrees C Conditions 168 Hours Floor Life (Out of Bag) At Factory Ambient (30°C / 60% Relative Humidity) (IPC/JEDEC JSTD-033A MSL Level 3 Compliant)* Ambient Operating Temperature (Power Applied) -40°C to 85°C Degrees C MTTF FT240XS TBD Hours MTTF FT240XQ TBD Hours VCC Supply Voltage -0.3 to +5.5 V VCCIO IO Voltage -0.3 to +4.0 V DC Input Voltage – USBDP and USBDM -0.5 to +3.63 V -0.3 to +5.8 V 22 mA DC Input Voltage – High Impedance Bi-directionals (powered from VCCIO) DC Output Current – Outputs Hours Table 5.1 Absolute Maximum Ratings * If devices are stored out of the packaging beyond this time limit the devices should be baked before use. The devices should be ramped up to a temperature of +125°C and baked for up to 17 hours. 5.2 ESD and Latch-up Specifications Description Specification Human Body Mode (HBM) > ± 2kV Machine mode (MM) > ± 200V Charged Device Mode (CDM) > ± 500V Latch-up > ± 200mA Table 5.2 ESD and Latch-Up Specifications Copyright © 2013 Future Technology Devices International Limited 16 FT240X USB 8-BIT FIFO IC Datasheet Version 1.3 Document No.: FT_000626 Clearance No.: FTDI# 259 5.3 DC Characteristics DC Characteristics (Ambient Temperature = -40°C to +85°C) Parameter Description Minimum Typical Maximum Units Conditions VCC VCC Operating Supply Voltage 2.97 5 5.5 V Normal Operation VCC2 VCCIO Operating Supply Voltage 1.62 --- 3.63 V Icc1 Operating Supply Current 8 8 8.4 mA Normal Operation Icc2 Operating Supply Current μA USB Suspend V VCC must be greater than 3V3 otherwise 3V3OUT is an input which must be driven with 3.3V 3V3 3.3v regulator output 125 2.97 3.3 3.63 Table 5.3 Operating Voltage and Current Copyright © 2013 Future Technology Devices International Limited 17 FT240X USB 8-BIT FIFO IC Datasheet Version 1.3 Document No.: FT_000626 Clearance No.: FTDI# 259 Parameter Description Minimum Typical Maximum Units Conditions Ioh = +/-2mA Voh Output Voltage High 2.97 VCCIO VCCIO V 2.97 VCCIO VCCIO V I/O Drive strength* = 8mA 2.97 VCCIO VCCIO V I/O Drive strength* = 12mA 2.97 VCCIO VCCIO V I/O Drive strength* = 16mA 0 0.4 V 0 0.4 V I/O Drive strength* = 8mA 0 0.4 V I/O Drive strength* = 12mA 0 0.4 V I/O Drive strength* = 16mA 0.8 V LVTTL V LVTTL LVTTL I/O Drive strength* = 4mA Iol = +/-2mA Vol Output Voltage Low I/O Drive strength* = 4mA Vil Input low Switching Threshold Vih Input High Switching Threshold Vt Switching Threshold 1.49 V Vt- Schmitt trigger negative going threshold voltage 1.15 V Vt+ Schmitt trigger positive going threshold voltage 1.64 V Rpu Input pull-up resistance 40 75 190 KΩ Vin = 0 Rpd Input pull-down resistance 40 75 190 KΩ Vin =VCCIO Iin Input Leakage Current -10 +/-1 10 μA Vin = 0 2.0 Tri-state output leakage -10 +/-1 10 μA current Table 5.4 FIFO I/O Pin Characteristics VCCIO = +3.3V, (except USB PHY pins) Ioz Vin = 5.5V or 0 * The I/O drive strength and slow slew-rate are configurable in the MTP memory. Copyright © 2013 Future Technology Devices International Limited 18 FT240X USB 8-BIT FIFO IC Datasheet Version 1.3 Document No.: FT_000626 Clearance No.: FTDI# 259 Parameter Description Minimum Typical Maximum Units Conditions Ioh = +/-2mA Voh Output Voltage High 2.25 VCCIO VCCIO V 2.25 VCCIO VCCIO V I/O Drive strength* = 8mA 2.25 VCCIO VCCIO V I/O Drive strength* = 12mA 2.25 VCCIO VCCIO V I/O Drive strength* = 16mA 0 0.4 V 0 0.4 V I/O Drive strength* = 8mA 0 0.4 V I/O Drive strength* = 12mA 0 0.4 V I/O Drive strength* = 16mA 0.8 V LVTTL V LVTTL LVTTL I/O Drive strength* = 4mA Iol = +/-2mA Vol Output Voltage Low I/O Drive strength* = 4mA Vil Input low Switching Threshold Vih Input High Switching Threshold Vt Switching Threshold 1.1 V Vt- Schmitt trigger negative going threshold voltage 0.8 V Vt+ Schmitt trigger positive going threshold voltage 1.2 V Rpu Input pull-up resistance 40 75 190 KΩ Vin = 0 Rpd Input pull-down resistance 40 75 190 KΩ Vin =VCCIO Iin Input Leakage Current -10 +/-1 10 μA Vin = 0 0.8 Tri-state output leakage -10 +/-1 10 μA current Table 5.5 FIFO I/O Pin Characteristics VCCIO = +2.5V, (except USB PHY pins) Ioz Vin = 5.5V or 0 * The I/O drive strength and slow slew-rate are configurable in the MTP memory. Copyright © 2013 Future Technology Devices International Limited 19 FT240X USB 8-BIT FIFO IC Datasheet Version 1.3 Document No.: FT_000626 Clearance No.: FTDI# 259 Parameter Description Minimum Typical Maximum Units Conditions Ioh = +/-2mA Voh Output Voltage High 1.62 VCCIO VCCIO V 1.62 VCCIO VCCIO V I/O Drive strength* = 8mA 1.62 VCCIO VCCIO V I/O Drive strength* = 12mA 1.62 VCCIO VCCIO V I/O Drive strength* = 16mA I/O Drive strength* = 4mA Iol = +/-2mA Vol Output Voltage Low 0 0.4 V 0 0.4 V I/O Drive strength* = 8mA 0 0.4 V I/O Drive strength* = 12mA 0 0.4 V I/O Drive strength* = 16mA 0.77 V LVTTL V LVTTL LVTTL I/O Drive strength* = 4mA Vil Input low Switching Threshold Vih Input High Switching Threshold Vt Switching Threshold 0.77 V Vt- Schmitt trigger negative going threshold voltage 0.557 V Vt+ Schmitt trigger positive going threshold voltage 0.893 V Rpu Input pull-up resistance 40 75 190 KΩ Vin = 0 Rpd Input pull-down resistance 40 75 190 KΩ Vin =VCCIO Iin Input Leakage Current -10 +/-1 10 μA Vin = 0 μA Vin = 5.5V or 0 1.6 Tri-state output leakage -10 +/-1 10 current Table 5.6 FIFO I/O Pin Characteristics VCCIO = +1.8V (except USB PHY pins) * The I/O drive strength and slow slew-rate are configurable in the MTP memory Ioz Copyright © 2013 Future Technology Devices International Limited 20 FT240X USB 8-BIT FIFO IC Datasheet Version 1.3 Document No.: FT_000626 Clearance No.: FTDI# 259 Parameter Description Minimum Voh Output Voltage High Vol Output Voltage Low Vil Input low Switching Threshold Vih Input High Switching Threshold Typical Maximum Units VCC-0.2 V - 0.2 V 0.8 V - 2.0 Conditions V Table 5.7 USB I/O Pin (USBDP, USBDM) Characteristics 5.4 MTP Memory Reliability Characteristics The internal 2048 Byte MTP memory has the following reliability characteristics: Parameter Value Unit Data Retention 10 Years Write Cycle 2,000 Cycles Read Cycle Unlimited Cycles Table 5.8 MTP Memory Characteristics 5.5 Internal Clock Characteristics The internal Clock Oscillator has the following characteristics: Value Parameter Unit Minimum Typical Maximum Frequency of Operation (see Note 1) 11.98 12.00 12.02 MHz Clock Period 83.19 83.33 83.47 ns Duty Cycle 45 50 55 % Table 5.9 Internal Clock Characteristics Note 1: Equivalent to +/-1667ppm Copyright © 2013 Future Technology Devices International Limited 21 FT240X USB 8-BIT FIFO IC Datasheet Version 1.3 Document No.: FT_000626 Clearance No.: FTDI# 259 6 USB Power Configurations The following sections illustrate possible USB power configurations for the FT240X. The illustrations have omitted pin numbers for ease of understanding since the pins differ between the FT240XS and FT240XQ package options. All USB power configurations illustrated apply to both package options for the FT240X device. Please refer to Section 0 for the package option pin-out and signal descriptions. 6.1 USB Bus Powered Configuration VCC Ferrite Bead 1 VCC 2 27R 3 27R USBDM USBDP 4 47pF FT240X 5 47pF SHIELD RESET# 10nF VCCIO GND GND VCC GN D AG ND 3V3OUT 100nF + 4.7uF 100nF GND GND Figure 6.1 Bus Powered Configuration Figure 6.1 illustrates the FT240X in a typical USB bus powered design configuration. A USB bus powered device gets its power from the USB bus. Basic rules for USB bus power devices are as follows – i) ii) iii) iv) v) On plug-in to USB, the device should draw no more current than 100mA. In USB Suspend mode the device should draw no more than 2.5mA. A bus powered high power USB device (one that draws more than 100mA) should use the PWREN# to keep the current below 100mA on plug-in and 2.5mA on USB suspend. A device that consumes more than 100mA cannot be plugged into a USB bus powered hub. No device can draw more than 500mA from the USB bus. The power descriptors in the internal MTP memory of the FT240X should be programmed to match the current drawn by the device. A ferrite bead is connected in series with the USB power supply to reduce EMI noise from the FT240X and associated circuitry being radiated down the USB cable to the USB host. The value of the Ferrite Bead depends on the total current drawn by the application. A suitable range of Ferrite Beads is available from Steward (www.steward.com), for example Steward Part # MI0805K601R-10. Copyright © 2013 Future Technology Devices International Limited 22 FT240X USB 8-BIT FIFO IC Datasheet Version 1.3 Document No.: FT_000626 Clearance No.: FTDI# 259 6.2 Self Powered Configuration VCC(3.3-5.25V) 1 VCC 27R 2 USBDM 27R 3 USBDP 4 47pF 47pF FT240X 4k7 5 VBUS_SENSE SHIELD VCCIO 10k GND RESET# GND 100nF GN D GND VCC 100nF AG ND 3V3OUT 100nF + 4.7uF GND GND Figure 6.2 Self Powered Configuration Figure 6.2 illustrates the FT240X in a typical USB self powered configuration. A USB self powered device gets its power from its own power supply, VCC, and does not draw current from the USB bus. The basic rules for USB self powered devices are as follows – i) ii) iii) A self powered device should not force current down the USB bus when the USB host or hub controller is powered down. A self powered device can use as much current as it needs during normal operation and USB suspend as it has its own power supply. A self powered device can be used with any USB host, a bus powered USB hub or a self powered USB hub. The power descriptor in the internal MTP memory of the FT240X should be programmed to a value of zero (self powered). In order to comply with the first requirement above, the USB bus power (pin 1) is used to control the VBUS_Sense pin of the FT240X device. When the USB host or hub is powered up an internal 1.5kΩ resistor on USBDP is pulled up to +3.3V, thus identifying the device as a full speed device to the USB host or hub. When the USB host or hub is powered off, VBUS_Sense pin will be low and the FT240X is held in a suspend state. In this state the internal 1.5kΩ resistor is not pulled up to any power supply (hub or host is powered down), so no current flows down USBDP via the 1.5kΩ pull-up resistor. Failure to do this may cause some USB host or hub controllers to power up erratically. Figure 6.3 illustrates a self powered design which has a +3.3V to +5.25V supply. Note: 1. When the FT240X is in reset, the interface I/O pins are tri-stated. Input pins have internal 200kΩ pull-up resistors to VCCIO, so they will gently pull high unless driven by some external logic. Copyright © 2013 Future Technology Devices International Limited 23 FT240X USB 8-BIT FIFO IC Datasheet Version 1.3 Document No.: FT_000626 Clearance No.: FTDI# 259 6.3 USB Bus Powered with Power Switching Configuration P Channel Power MOSFET Switched 5V Power to External Logic 0.1uF 0.1uF 10k 1k PWREN# Ferrite Bead 1 VCC 2 27R 3 27R USBDM USBDP 4 47pF 47pF FT240X 5 SHIELD RESET# 10nF VCCIO VCC CBUS5 GN D AG ND 3V3OUT GND 100nF + 4.7uF 100nF GND GND Figure 6.4 Bus Powered with Power Switching Configuration A requirement of USB bus powered applications, is when in USB suspend mode the application draws a total current of less than 2.5mA. This requirement includes external logic. Some external logic has the ability to power itself down into a low current state by monitoring the PWREN# signal. For external logic that cannot power itself down in this way, the FT240X provides a simple but effective method of turning off power during the USB suspend mode. Figure 6.4 shows an example of using a discrete P-Channel MOSFET to control the power to external logic. A suitable device to do this is an International Rectifier (www.irf.com) IRLML6402, or equivalent. It is recommended that a “soft start” circuit consisting of a 1kΩ series resistor and a 0.1μF capacitor is used to limit the current surge when the MOSFET turns on. Without the soft start circuit it is possible that the transient power surge, caused when the MOSFET switches on, will reset the FT240X or the USB host/hub controller. The soft start circuit example shown in Figure 6.4 powers up with a slew rate of approximaely12.5V/ms. Thus supply voltage to external logic transitions from GND to +5V in approximately 400 microseconds. As an alternative to the MOSFET, a dedicated power switch IC with inbuilt “soft-start” can be used. A suitable power switch IC for such an application is the Micrel (www.micrel.com) MIC2025-2BM or equivalent. With power switching controlled designs the following should be noted: i) The external logic to which the power is being switched should have its own reset circuitry to automatically reset the logic when power is re-applied when moving out of suspend mode. ii) Set the Pull-down on Suspend option in the internal FT240X MTP memory. iii) The PWREN# pin should be used to switch the power to the external circuitry. iv) For USB high-power bus powered applications (one that consumes greater than 100mA, and up to 500mA of current from the USB bus), the power consumption of the application must be set in the Max Power field in the internal FT240X MTP memory. A high-power bus powered application uses the descriptor in the internal FT240X MTP memory to inform the system of its power requirements. v) PWREN# gets its VCC from VCCIO. For designs using 3V3 logic, ensure VCCIO is not powered down using the external logic. In this case use the +3V3OUT. Copyright © 2013 Future Technology Devices International Limited 24 FT240X USB 8-BIT FIFO IC Datasheet Version 1.3 Document No.: FT_000626 Clearance No.: FTDI# 259 7 Application Examples The following sections illustrate possible applications of the FT240X. The illustrations have omitted pin numbers for ease of understanding since the pins differ between the FT240XS and FT240XQ package options. 7.1 USB to MCU FIFO Interface VCC VCC Ferrite Bead 1 D0 I/O10 D1 I/O11 D2 I/O12 D3 I/O13 D4 I/O14 D5 I/O15 D6 I/O16 D7 I/O17 RXF# I/O20 TXE# I/O21 RD# I/O22 WR# I/O23 VCC 2 27R 3 27R USBDM USBDP + 4 VCCIO FT240X RESET# SHIELD GND Vcc 100nF 4.7uF + Microcontroller 10nF 5 3V3OUT GND USBDP 100nF A G N D G N D USBDM Vcc GND 47pF I/O24 PWREN# 47pF 10k GND GND Figure 7.1 USB to MCU FIFO Interface A typical example of using the FT240X as a USB to Microcontroller (MCU) FIFO interface is illustrated in Figure 7.1. This example uses two MCU I/O ports: one port (8 bits) to transfer data and the other port (4 or 5 bits) to monitor the TXE# and RXF# status bits and generate the RD# and WR strobes to the FT240X, when required. Using PWREN# for this function is optional. Copyright © 2013 Future Technology Devices International Limited 25 FT240X USB 8-BIT FIFO IC Datasheet Version 1.3 Document No.: FT_000626 Clearance No.: FTDI# 259 7.2 Battery Charge Detection A recent addition to the USB specification (http://www.usb.org/developers/devclass_docs/BCv1.2_011912.zip) is to allow for additional charging profiles to be used for charging batteries in portable devices. These charging profiles do not enumerate the USB port of the peripheral. The FT240X device will detect that a USB compliant dedicated charging port (DCP) is connected. Once detected while in suspend mode a battery charge detection signal is provided to allow external logic to switch to charging mode as opposed to operation mode. VBUS 3V3OUT VBUS VBUS DD+ ID GND 1 2 3 4 5 VBUS 0.1uF GND DM DP 27R 27R 3V3OUT 0.1uF VCCIO 3V3OUT VCC 600R/2A CN USB 3V3OUT GND RESET# 10nF N.F. GND GND 0.1uF 0R BCD CBUS0 FT240X SLD GND GND GND VBUS VBUS GND VBUS VBATT 4.7uF 0.1uF GND 1 2 3 4 5 GND CHRG VCC FAULT TIMER GND ACPR BAT SHDN PROG NTC GND 0.1uF 10 9 8 7 6 1 + NCT TB3.5mm BCD NTC LTC4053EDD 11 2K2 1uF 1K5 1R GND GND GND GND GND EEPROM Setting X-Chip Pin CBUS0 Function BCD GND GND 1A when connected to a dedicated charger port 0A when enumerated 0A when not enumerated and not in sleep 0A when in sleep VBUS Battery Options Battery Charger Enable X Force Power Enable NTC JP1 NCT Available 4K32 1% De-acticate Sleep JUMPER-2mm JP1 SIP-3 1-2 2-3 NCT Enabled NCT Disabled (Default) GND Figure 7.2 USB Battery Charging Detection (1 pin) To use the FT240X with battery charging detection the CBUS pins must be reprogrammed to allow for the BCD Charger output to switch the external charger circuitry on. The CBUS pins are configured in the internal MTP memory with the free utility FTPROG. If the charging circuitry requires an active low signal to enable it, the CBUS pin can be programmed to BCD Charger# as an alternative. When connected to a USB compliant dedicated charging port (DCP, as opposed to a standard USB host) the device USB signals will be shorted together and the device suspended. The BCD charger signal will bring the LTC4053 out of suspend and allow battery charging to start. The charge current in the example above is 1A as defined by the resistance on the PROG pin. Alternatively the PWREN# And SLEEP pins may be used to control the LTC4053 such that a battery may be charged from a standard host (low current) or from a dedicated charging port (high current). In such a design as shown above the charge current would need to be limited to 0.4A to ensure that the USB host power limit is not exceeded. Copyright © 2013 Future Technology Devices International Limited 26 FT240X USB 8-BIT FIFO IC Datasheet Version 1.3 Document No.: FT_000626 Clearance No.: FTDI# 259 VBUS 3V3OUT VBUS 3V3OUT VBUS U1 1 2 3 4 5 VCCIO 3V3OUT CN USB VBUS DD+ ID GND 0.1uF VCORE VCC 600R/2A GND DM DP 27R 27R 3V3OUT 0.1uF GND RESET# 10nF N.F. 0.1uF 0R SLD GND SLEEP# PWREN# CBUS5 CBUS6 GND FT240X GND GND VBUS VBUS VBUS VBATT 4.7uF 0.1uF GND CHRG VCC FAULT TIMER GND GND 1 2 3 4 5 GND 10 9 8 7 6 1 + NCT TB3.5mm SLEEP# NTC LTC4053EDD 11 0.1uF ACPR BAT SHDN PROG NTC 2K2 16K5 1% 1uF 4K32 1% 1R PWREN# GND GND GND EEPROM Setting GND GND GND GND 0.4A when connected to a dedicated charger port 0.4A when enumerated 0.1A when not enumerated and not in sleep mode 0A when in sleep mode VBUS Battery Options X-Chip Pin CBUS5 CBUS6 Function SLEEP# PWREN# Battery Charger Enable X X De-acticate Sleep X NTC JP1 NCT Available 4K32 1% Force Power Enable JUMPER-2mm JP1 SIP-3 1-2 2-3 NCT Enabled NCT Disabled (Default) GND Figure 7.3 USB Battery Charging Detection (2 pin) In the example above the FT240X SLEEP pin is used to enable/disable the LTC4053, while the PWREN# signal alters the charging current by altering the resistance on the LTC4053 PROG pin. To calculate the equivalent resistance on the LTC4053 PROG pin select a charge current, then Res = 1500V/Ichg For more configuration options of the LTC4053 refer to: AN_175_Battery Charging Over USB Note: If the FT240X is connected to a standard host port such that the device is enumerated the battery charge detection signal is inactive as the device will not be in suspend. Copyright © 2013 Future Technology Devices International Limited 27 FT240X USB 8-BIT FIFO IC Datasheet Version 1.3 Document No.: FT_000626 Clearance No.: FTDI# 259 8 Internal MTP Memory Configuration The FT240X includes an internal MTP memory which holds the USB configuration descriptors, other configuration data for the chip and also user data areas. Following a power-on reset or a USB reset the FT240X will scan its internal MTP memory and read the USB configuration descriptors stored there. In many cases, the default values programmed into the MTP memory will be suitable and no reprogramming will be necessary. The defaults can be found in Section 8.1. The MTP memory in the FT240X can be programmed over USB if the values need to be changed for a particular application. Further details of this are provided from section 8.2 onwards. Users who do not have their own USB Vendor ID but who would like to use a unique Product ID in their design can apply to FTDI for a free block of unique PIDs. See TN_100 – USB Vendor ID/Product ID Guidelines for more details. 8.1 Default Values The default factory programmed values of the internal MTP memory are shown in Table 8.1. Parameter Value Notes USB Vendor ID (VID) 0403h FTDI default VID (hex) USB Product UD (PID) 6015h FTDI default PID (hex) Serial Number Enabled Yes Serial Number See Note A unique serial number is generated and programmed into the MTP memory during device final test. Pull down I/O Pins in USB Suspend Disabled Enabling this option will make the device pull down on the FIFO interface lines when in USB suspend mode (PWREN# is high). Manufacturer Name FTDI Product Description FT240X USB FIFO Max Bus Power Current 90mA Power Source Bus Powered Device Type FT240X Returns USB 2.0 device description to the host. Note: The device is a USB 2.0 Full Speed device (12Mb/s) as opposed to a USB 2.0 High Speed device (480Mb/s). USB Version 0200 Remote Wake Up Disabled Taking SIWU# low will wake up the USB host controller from suspend in approximately 20 ms. When enabled. DBUS Drive Current Strength 4mA Options are 4mA, 8mA, 12mA, 16mA DBUS slew rate Slow Options are slow or fast Copyright © 2013 Future Technology Devices International Limited 28 FT240X USB 8-BIT FIFO IC Datasheet Version 1.3 Document No.: FT_000626 Clearance No.: FTDI# 259 Parameter Value Notes DBUS Schmitt Trigger Enable Normal Options are normal or Schmitt CBUS Drive Current Strength 4mA Options are 4mA, 8mA, 12mA, 16mA CBUS slew rate Slow Options are slow or fast CBUS Schmitt Trigger Enable Normal Options are normal or Schmitt High Current I/Os Disabled Enables the high drive level on the FIFO data bus and control I/O pins. Load VCP Driver Disabled Enabling this will load the VCP driver interface for the device. CBUS5 VBUS_Sense Used to detect when the device is connected to a USB host and power is available. CBUS6 Keep_Awake# Prevents the device from entering suspend state when unplugged. Table 8.1 Default Internal MTP Memory Configuration 8.2 Methods of Programming the MTP Memory 8.2.1 Programming the MTP memory over USB The MTP memory on all FT-X devices can be programmed over USB. This method is the same as for the EEPROM on other FTDI devices such as the FT232R. No additional hardware, connections or programming voltages are required. The device is simply connected to the host computer in the same way that it would be for normal applications, and the FT_Prog utility is used to set the required options and program the device. The FT_Prog utility is provided free-of-charge from the FTDI website, and can be found at the link below. The user guide is also available at this link. Note that the FT-X devices require FT_Prog version 2.5 or later. http://www.ftdichip.com/Support/Utilities.htm#FT_Prog Additionally, D2XX commands can be used to program the MTP memory from within user applications. For more information on the commands available, please see the D2XX Programmers Guide below. http://www.ftdichip.com/Support/Documents/ProgramGuides/D2XX_Programmer's_Guide(FT_000071).p df Copyright © 2013 Future Technology Devices International Limited 29 FT240X USB 8-BIT FIFO IC Datasheet Version 1.3 Document No.: FT_000626 Clearance No.: FTDI# 259 8.3 Memory Map The FT-X family MTP memory has various areas which come under three main categories: User Memory Area Configuration Memory Area (writable) Configuration Memory Area (non-writable) Memory Area Description Word Address User Memory Area 2 Accessible via USB 0x3FF - 0x80 Configuration Memory Area Accessible via USB 0x7E - 0x50 Configuration Memory Area Cannot be written 0x4E - 0x40 User Memory Area 1 Accessible via USB 0x3E - 0x12 Configuration Memory Area Accessible via USB 0x10 - 0x00 Figure 8.1: Simplified memory map for the FT-X User Memory Area The User Memory Areas are highlighted in Green on the memory map. They can be read and written via USB on the FT240X. All locations within this range are freely programmable; no areas have special functions and there is no checksum for the user area. Note that the application should take into account the specification for the number of write cycles in Section 5.4 if it will be writing to the MTP memory multiple times. Configuration Memory Area (writable) This area stores the configuration data for the device, including the data which is returned to the host in the configuration descriptors (e.g. the VID, PID and string descriptions) and also values which set the hardware configuration (the signal assigned to each CBUS pin for example). These values can have a significant effect on the behaviour of the device. Steps must be taken to ensure that these locations are not written to un-intentionally by an application which is intended to access only the user area. This area is included in a checksum which covers configuration areas of the memory, and so changing any value can also cause this checksum to fail. Configuration Memory Area (non-writable) This is a reserved area and the application should not write to this area of memory. Any attempt to write these locations will fail. Copyright © 2013 Future Technology Devices International Limited 30 FT240X USB 8-BIT FIFO IC Datasheet Version 1.3 Document No.: FT_000626 Clearance No.: FTDI# 259 9 Package Parameters The FT240X is available in two different packages. The FT240XS is the SSOP-24 option and the FT240XQ is the QFN-24 package option. The solder reflow profile for both packages is described in Section 9.5. 9.1 SSOP-24 Package Mechanical Dimensions Figure 9.1 SSOP-24 Package Dimensions The FT240XS is supplied in a RoHS compliant 24 pin SSOP package. The package is lead (Pb) free and uses a ‘green’ compound. The package is fully compliant with European Union directive 2002/95/EC. This package is nominally 8.66mm x 3.91 mm body (8.66mm x 5.99mm including pins). The pins are on a 0.635 mm pitch. The above mechanical drawing shows the SSOP-24 package. The date code format is YYXX where XX = 2 digit week number, YY = 2 digit year number. The code XXXXXXXXXXXX is the manufacturing LOT code. Copyright © 2013 Future Technology Devices International Limited 31 FT240X USB 8-BIT FIFO IC Datasheet Version 1.3 Document No.: FT_000626 Clearance No.: FTDI# 259 9.2 SSOP-24 Package Markings 24 13 Line 1 – FTDI Logo -B Line 2 – Date Code, Revision Line 3 – Wafer Lot Number FT240XS 1 Line 4 – FTDI Part Number 12 Figure 9.2 SSOP-24 Package Markings Notes: 1. YYWW = Date Code, where YY is year and WW is week number 2. Marking alignment should be centre justified 3. Laser Marking should be used 4. All marking dimensions should be marked proportionally. Marking font should be using Greatek standard font (Roman Simplex) Copyright © 2013 Future Technology Devices International Limited 32 FT240X USB 8-BIT FIFO IC Datasheet Version 1.3 Document No.: FT_000626 Clearance No.: FTDI# 259 9.3 QFN-24 Package Mechanical Dimensions Figure 9.3 QFN-24 Package Dimensions The FT240XQ is supplied in a RoHS compliant leadless QFN-24 package - WQFN(X424), with pad size 114x114. The package is lead ( Pb ) free, and uses a ‘green’ compound. The package is fully compliant with European Union directive 2002/95/EC. This package is nominally 4.0mm x 4.0mm. The solder pads are on a 0.50mm pitch. The above mechanical drawing shows the QFN-24 package. All dimensions are in millimetres. The centre pad on the base of the FT240XQ is internally connected to GND, and the PCB should not have tracking on the top layer in this area. The date code format is YYXX where XX = 2 digit week number, YY = 2 digit year number. The code XXXXXXX is the manufacturing LOT code. Copyright © 2013 Future Technology Devices International Limited 33 FT240X USB 8-BIT FIFO IC Datasheet Version 1.3 Document No.: FT_000626 Clearance No.: FTDI# 259 9.4 QFN-24 Package Markings 19 1 FTD I XXXXXXXXXX FT240XQ YYWW-B 7 18 Line 1 – FTDI Logo Line 2 – Wafer Lot Number Line 3 – FTDI Part Number Line 4 – Date Code, Revision 12 Figure 9.4 QFN-24 Package Markings Notes: 1. 2. 3. 4. YYWW = Date Code, where YY is year and WW is week number Marking alignment should be centre justified Laser Marking should be used All marking dimensions should be marked proportionally. Marking font should be using Greatek standard font (Roman Simplex) Copyright © 2013 Future Technology Devices International Limited 34 FT240X USB 8-BIT FIFO IC Datasheet Version 1.3 Document No.: FT_000626 Clearance No.: FTDI# 259 9.5 Solder Reflow Profile The FT240X is supplied in Pb free 24 LD SSOP and QFN-24 packages. The recommended solder reflow profile for both package options is shown in 9.5. Temperature, T (Degrees C) tp Tp Critical Zone: when T is in the range TL to Tp Ramp Up TL tL TS Max Ramp Down TS Min tS Preheat 25 T = 25º C to TP Time, t (seconds) Figure 9.5 FT240X Solder Reflow Profile The recommended values for the solder reflow profile are detailed in Table 9.1. Values are shown for both a completely Pb free solder process (i.e. the FT240X is used with Pb free solder), and for a non-Pb free solder process (i.e. the FT240X is used with non-Pb free solder). Profile Feature Pb Free Solder Process Non-Pb Free Solder Process 3°C / second Max. 3°C / Second Max. Preheat - Temperature Min (Ts Min.) - Temperature Max (Ts Max.) - Time (ts Min to ts Max) 150°C 200°C 60 to 120 seconds 100°C 150°C 60 to 120 seconds Time Maintained Above Critical Temperature TL: - Temperature (TL) - Time (tL) 217°C 60 to 150 seconds 183°C 60 to 150 seconds 260°C 240°C 20 to 40 seconds 20 to 40 seconds 6°C / second Max. 6°C / second Max. 8 minutes Max. 6 minutes Max. Average Ramp Up Rate (Ts to Tp) Peak Temperature (Tp) Time within 5°C of actual Peak Temperature (tp) Ramp Down Rate Time for T= 25°C to Peak Temperature, Tp Table 9.1 Reflow Profile Parameter Values Copyright © 2013 Future Technology Devices International Limited 35 FT240X USB 8-BIT FIFO IC Datasheet Version 1.3 Document No.: FT_000626 Clearance No.: FTDI# 259 10 Contact Information Branch Office – Hillsboro, Oregon, USA Head Office – Glasgow, UK Future Technology Devices International Limited Unit 1, 2 Seaward Place, Centurion Business Park Glasgow G41 1HH United Kingdom Tel: +44 (0) 141 429 2777 Fax: +44 (0) 141 429 2758 Future Technology Devices International Limited (USA) 7130 SW Fir Loop Tigard, OR 97223 USA Tel: +1 (503) 547 0988 Fax: +1 (503) 547 0987 E-mail (Sales) E-mail (Support) E-mail (General Enquiries) E-Mail (Sales) E-Mail (Support) E-Mail (General Enquiries) [email protected] [email protected] [email protected] Branch Office – Taipei, Taiwan Future Technology Devices International Limited (Taiwan) 2F, No. 516, Sec. 1, NeiHu Road Taipei 114 Taiwan , R.O.C. Tel: +886 (0) 2 8791 3570 Fax: +886 (0) 2 8791 3576 E-mail (Sales) E-mail (Support) E-mail (General Enquiries) [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] Branch Office – Shanghai, China Future Technology Devices International Limited (China) Room 408, 317 Xianxia Road, Shanghai, 200051 China Tel: +86 21 62351596 Fax: +86 21 62351595 E-mail (Sales) E-mail (Support) E-mail (General Enquiries) [email protected] [email protected] [email protected] Web Site http://ftdichip.com System and equipment manufacturers and designers are responsible to ensure that their systems, and any Future Technology Devices International Ltd (FTDI) devices incorporated in their systems, meet all applicable safety, regulatory and system-level performance requirements. All application-related information in this document (including application descriptions, suggested FTDI devices and other materials) is provided for reference only. While FTDI has taken care to assure it is accurate, this information is subject to customer confirmation, and FTDI disclaims all liability for system designs and for any applications assistance provided by FTDI. Use of FTDI devices in life support and/or safety applications is entirely at the user’s risk, and the user agrees to defend, indemnify and hold harmless FTDI from any and all damages, claims, suits or expense resulting from such use. This document is subject to change without notice. No freedom to use patents or other intellectual property rights is implied by the publication of this document. Neither the whole nor any part of the information contained in, or the product described in this document, may be adapted or reproduced in any material or electronic form without the prior written consent of the copyright holder. Future Technology Devices International Ltd, Unit 1, 2 Seaward Place, Centurion Business Park, Glasgow G41 1HH, United Kingdom. Scotland Registered Company Number: SC136640 Copyright © 2013 Future Technology Devices International Limited 36 FT240X USB 8-BIT FIFO IC Datasheet Version 1.3 Document No.: FT_000626 Clearance No.: FTDI# 259 Appendix A - References Useful Application Notes http://www.ftdichip.com/Documents/AppNotes/AN232R-01_FT232RBitBangModes.pdf http://www.ftdichip.com/Documents/AppNotes/AN_107_AdvancedDriverOptions_AN_000073.pdf http://www.ftdichip.com/Documents/AppNotes/AN_121_FTDI_Device_EEPROM_User_Area_Usage.pdf http://www.ftdichip.com/Documents/AppNotes/AN_120_Aliasing_VCP_Baud_Rates.pdf http://www.ftdichip.com/Documents/AppNotes/AN_100_Using_The_FT232_245R_With_External_Osc(FT_ 000067).pdf http://www.ftdichip.com/Resources/Utilities/AN_126_User_Guide_For_FT232_Factory%20test%20utility. pdf http://www.ftdichip.com/Documents/AppNotes/AN232B-05_BaudRates.pdf http://www.ftdichip.com/Documents/InstallGuides.htm http://www.ftdichip.com/Support/Documents/TechnicalNotes/TN_100_USB_VID-PID_Guidelines.pdf http://www.ftdichip.com/Support/Documents/AppNotes/AN_175_Battery%20Charging%20Over%20USB %20with%20FTEX%20Devices.pdf http://www.usb.org/developers/devclass_docs/BCv1.2_011912.zip Copyright © 2013 Future Technology Devices International Limited 37 FT240X USB 8-BIT FIFO IC Datasheet Version 1.3 Document No.: FT_000626 Clearance No.: FTDI# 259 Appendix B - List of Figures and Tables List of Figures Figure 2.1 FT240X Block Diagram ................................................................................................... 4 Figure 3.1 SSOP Package Pin Out and Schematic Symbol ................................................................... 7 Figure 3.2 QFN-24 Package Pin Out and schematic symbol ................................................................ 9 Figure 3.3 FIFO Read Cycle .......................................................................................................... 12 Figure 3.4 FIFO Write Cycle ......................................................................................................... 13 Figure 6.1 Bus Powered Configuration ........................................................................................... 22 Figure 6.2 Self Powered Configuration ........................................................................................... 23 Figure 6.3 illustrates a self powered design which has a +3.3V to +5.25V supply. .............................. 23 Figure 6.4 Bus Powered with Power Switching Configuration ............................................................ 24 Figure 7.1 USB to MCU FIFO Interface ........................................................................................... 25 Figure 7.2 USB Battery Charging Detection (1 pin).......................................................................... 26 Figure 7.3 USB Battery Charging Detection (2 pin).......................................................................... 27 Figure 8.1: Simplified memory map for the FT-X ............................................................................ 30 Figure 9.1 SSOP-24 Package Dimensions ....................................................................................... 31 Figure 9.2 SSOP-24 Package Markings .......................................................................................... 32 Figure 9.3 QFN-24 Package Dimensions ......................................................................................... 33 Figure 9.4 QFN-24 Package Markings ............................................................................................ 34 Figure 9.5 FT240X Solder Reflow Profile......................................................................................... 35 List of Tables Table 3.1 USB Interface Group ....................................................................................................... 7 Table 3.2 Power and Ground Group ................................................................................................. 7 Table 3.3 Miscellaneous Signal Group .............................................................................................. 8 Table 3.4 FIFO Interface Group (see note 2) .................................................................................... 8 Table 3.5 USB Interface Group ....................................................................................................... 9 Table 3.6 Power and Ground Group ................................................................................................. 9 Table 3.7 Miscellaneous Signal Group ............................................................................................ 10 Table 3.8 FIFO Interface Group (see note 2) .................................................................................. 10 Table 3.9 CBUS Configuration Control ........................................................................................... 11 Table 3.10 FIFO Read Cycle Timings ............................................................................................. 12 Table 3.11 FIFO Write Cycle ......................................................................................................... 13 Table 5.1 Absolute Maximum Ratings ............................................................................................ 16 Table 5.2 ESD and Latch-Up Specifications .................................................................................... 16 Table 5.3 Operating Voltage and Current ....................................................................................... 17 Table 5.4 FIFO I/O Pin Characteristics VCCIO = +3.3V, (except USB PHY pins) .................................. 18 Table 5.5 FIFO I/O Pin Characteristics VCCIO = +2.5V, (except USB PHY pins) .................................. 19 Table 5.6 FIFO I/O Pin Characteristics VCCIO = +1.8V (except USB PHY pins) ................................... 20 Table 5.7 USB I/O Pin (USBDP, USBDM) Characteristics .................................................................. 21 Table 5.8 MTP Memory Characteristics........................................................................................... 21 Table 5.9 Internal Clock Characteristics ......................................................................................... 21 Copyright © 2013 Future Technology Devices International Limited 38 FT240X USB 8-BIT FIFO IC Datasheet Version 1.3 Document No.: FT_000626 Clearance No.: FTDI# 259 Table 8.1 Default Internal MTP Memory Configuration ..................................................................... 29 Table 9.1 Reflow Profile Parameter Values ..................................................................................... 35 Copyright © 2013 Future Technology Devices International Limited 39 FT240X USB 8-BIT FIFO IC Datasheet Version 1.3 Document No.: FT_000626 Clearance No.: FTDI# 259 Appendix C - Revision History Document Title: USB 8-BIT FIFO IC FT240X Document Reference No.: FT_000626 Clearance No.: FTDI# 259 Product Page: http://www.ftdichip.com/FT-X.htm Document Feedback: Send Feedback Version 1.0 Initial Datasheet Created Version 1.1 Replaced VCC_CORE with VCORE Version 1.2 07/02/12 Updated 24 pin SSOP dimensions 22/02/12 Clarified MTP Reliability in table 5.8 17/04/12 Edited Table 8.1, changed “Load VCP Driver” to Disabled Version 1.2 Removed references to LED signals on the CBUS pins 24/09/2012 in table 3.9 as these are not available on the FT240X. Version 1.3 updated fron t page to clarify 5V tolerant 14/02/2013 Updated TID Updated US address Copyright © 2013 Future Technology Devices International Limited 40