FT234XD USB TO BASIC UART IC Version 1.2 Document No.: FT_000753 Clearance No.: FTDI#324 Future Technology Devices International Ltd. FT234XD (USB to BASIC UART IC) The FT234XD is a USB to serial UART interface with optimised packaging (3mm x 3mm 12 pin DFN) for smaller PCB designs and the following advanced features: USB Battery Charging 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. Single chip USB to asynchronous serial data transfer interface. USB Power Configurations; supports bus- powered, self-powered and bus-powered with power switching Entire USB protocol handled on the chip. No USB specific firmware programming required. Integrated +3.3V level converter for USB I/O. Fully integrated 2048 byte multi-timeprogrammable (MTP) memory, storing device descriptors and CBUS I/O configuration. True 3.3V CMOS drive output and TTL input; Operates down to 1V8 with external pull ups. Tolerant of 5V input. Fully integrated clock generation with no external crystal required plus optional clock output selection enabling a glue-less interface to external MCU or FPGA. Configurable I/O pin output drive strength; 4 mA (min) and 16 mA (max). Integrated power-on-reset circuit. Data transfer rates from 300 baud to 3 Mbaud (RS422, RS485, and RS232) at TTL levels. Fully integrated AVCC supply filtering external filtering required. 512 byte receive buffer and 512 byte transmit buffer utilising buffer smoothing technology to allow for high data throughput. UART signal inversion option. + 5V Single Supply Operation. Internal 3.3V/1.8V LDO regulators Low operating and USB suspend current; 8mA (active-typ) and 70uA (suspend-typ). - no FTDI’s royalty-free Virtual Com Port (VCP) and Direct (D2XX) drivers eliminate the requirement for USB driver development in most cases. Configurable CBUS I/O pin. UHCI/OHCI/EHCI host controller compatible. Transmit and receive LED drive signals. USB 2.0 Full Speed compatible. UART interface support for 7 or 8 data bits, 1 or 2 stop bits and odd / even / mark / space / no parity Extended operating temperature range; -40 to 85⁰C. Synchronous and asynchronous bit bang interface options with RD# and WR# strobes. Available in compact Pb-free 12 pin DFN package (3mm x 3mm) RoHS compliant. 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 © 2015 Future Technology Devices International Limited 1 FT234XD USB TO BASIC UART IC Version 1.2 Document No.: FT_000753 Clearance No.: FTDI#324 1 Typical Applications USB to RS232/RS422/RS485 Converters USB Industrial Control Upgrading Legacy Peripherals to USB USB FLASH Card Reader and Writers Utilising USB to add system modularity Set Top Box PC - USB interface Incorporate USB interface to enable PC transfers for development system communication USB Wireless Modems USB Bar Code Readers USB dongle implementations for Software/ Hardware Encryption and Wireless Modules Detection of dedicated charging port for battery charging at higher supply currents. Cellular and Cordless Phone USB data transfer cables and interfaces Interfacing MCU/PLD/FPGA based designs to add USB connectivity USB Audio and Low Bandwidth Video data transfer USB Smart Card Readers USB Instrumentation 1.1 Driver Support Royalty free VIRTUAL COM PORT (VCP) DRIVERS for... Royalty free D2XX Direct Drivers (USB Drivers + DLL S/W Interface) Windows 10 32,64-bit Windows 10 32,64-bit Windows 8/8.1 32,64-bit Windows 8/8.1 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 98, 98SE, ME, 2000, Server 2003, XP, Server 2008 and server 2012 R2 Windows 98, 98SE, ME, 2000, Server 2003, XP, Server 2008 and server 2012 R2 Windows XP Embedded Windows XP Embedded Windows CE 4.2, 5.0 and 6.0 Windows CE 4.2, 5.0 and 6.0 Mac OS 8/9, OS-X Linux 2.4 and greater Linux 2.4 and greater Android(J2xx) 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 http://www.ftdichip.com/Documents/InstallGuides.htm 1.2 Part Numbers Part Number Package FT234XD-x 12 Pin DFN Note: Packing codes for x is: - R: Taped and Reel - 5,000pcs per reel. - T: Tray packing - 490pcs per tray. Copyright © 2015 Future Technology Devices International Limited 2 FT234XD USB TO BASIC UART IC Version 1.2 Document No.: FT_000753 Clearance No.: FTDI#324 1.3 USB Compliant The FT234XD is fully compliant with the USB 2.0 specification and has been given the USB-IF Test-ID (TID) 40001465 (Rev D). Copyright © 2015 Future Technology Devices International Limited 3 FT234XD USB TO BASIC UART IC Version 1.2 Document No.: FT_000753 Clearance No.: FTDI#324 2 FT234XD 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 48MHz 1.8 Volt LDO Regulator FIFO RX Buffer (512 bytes) Baud Rate Generator TXD RXD RTS# CTS# Serial Interface Engine (SIE) USB Protocol Engine UART FIFO Controller UART Controller with Programmable Signal Inversion CBUS0 Internal MTP Memory 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 FT234XD Block Diagram For a description of each function please refer to Section 4. Copyright © 2015 Future Technology Devices International Limited 4 FT234XD USB TO BASIC UART IC Version 1.2 Document No.: FT_000753 Clearance No.: FTDI#324 Table of Contents 1 Typical Applications ...................................................................... 2 1.1 Driver Support .................................................................................... 2 1.2 Part Numbers...................................................................................... 2 1.3 USB Compliant .................................................................................... 3 2 FT234XD Block Diagram ............................................................... 4 3 Device Pin Out and Signal Description .......................................... 7 3.1 12-Pin 3.1.1 3.2 4 DFN Package.......................................................................... 7 DFN Package PinOut Description .................................................................................... 7 CBUS Signal Options ........................................................................... 9 Function Description................................................................... 11 4.1 Key Features ..................................................................................... 11 4.2 Functional Block Descriptions ........................................................... 11 5 Devices Characteristics and Ratings ........................................... 14 5.1 Absolute Maximum Ratings............................................................... 14 5.2 DC Characteristics............................................................................. 15 5.3 MTP Memory Reliability Characteristics ............................................ 19 5.4 Internal Clock Characteristics ........................................................... 19 6 USB Power Configurations .......................................................... 20 6.1 USB Bus Powered Configuration ...................................................... 20 6.2 Self Powered Configuration .............................................................. 21 6.3 USB Bus Powered with Power Switching Configuration .................... 22 7 Application Examples ................................................................. 23 7.1 USB to RS232 Converter ................................................................... 23 7.2 USB to RS485 Coverter ..................................................................... 24 7.3 USB to RS422 Converter ................................................................... 25 7.4 USB Battery Charging Detection ....................................................... 26 7.5 LED Interface .................................................................................... 27 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 9.1 DFN-12 Package Mechanical Dimensions .......................................... 31 9.2 DFN-12 Package Markings ................................................................ 32 Copyright © 2015 Future Technology Devices International Limited 5 FT234XD USB TO BASIC UART IC Version 1.2 Document No.: FT_000753 Clearance No.: FTDI#324 9.3 10 Solder Reflow Profile ........................................................................ 33 Contact Information ................................................................... 34 Appendix A – References ........................................................................... 35 Appendix B - List of Figures and Tables ..................................................... 36 Appendix C - Revision History .................................................................... 37 Copyright © 2015 Future Technology Devices International Limited 6 FT234XD USB TO BASIC UART IC Version 1.2 Document No.: FT_000753 Clearance No.: FTDI#324 Device Pin Out and Signal Description DFN Package 3V3OUT 1 12 VCC 3 VCCIO 4 3.1 12-Pin 9 3 USBDM USBDP TXD RXD RTS# CTS# GND 5 RESET# 6 13 2 GND CBUS0 7 10 8 11 Figure 3.1 DFN Schematic Symbol 3.1.1 DFN Package PinOut Description Note: # denotes an active low signal. Pin No. 4 9 3 5, 13 Name Type ** POWER Input VCC VCCIO ** 3.3VOUT GND POWER Input Description 5 V (or 3.3V) supply to IC 1.8V – 3.3V supply for the IO cells 3.3V output at 50mA. May be used to power VCCIO. POWER Output POWER Input When VCC is 3.3V; pin 3 is an input pin and should be connected to pin 4. 0V Ground input. Table 3.1 Power and Ground *Pin 13 is the centre pad under the IC. Connect to GND. ** If VCC is 3.3V then 3.3VOUT must also be driven with 3.3V input Copyright © 2015 Future Technology Devices International Limited 7 FT234XD USB TO BASIC UART IC Version 1.2 Document No.: FT_000753 Clearance No.: FTDI#324 Pin No. Name Type Description 1 USBDM INPUT/OUTPUT USB Data Signal Minus. 12 USBDP INPUT/OUTPUT USB Data Signal Plus. 2 RESET# INPUT Reset input (active low). Table 3.2 Common Function pins Pin No. Name Type Description 7 TXD Output Transmit Asynchronous Data Output. 10 RXD Input Receiving Asynchronous Data Input. 8 RTS# Output 11 CTS# Input 6 CBUS0 I/O Request to Send Control Output / Handshake Signal. Clear To Send Control Input / Handshake Signal. Configurable CBUS I/O Pin. Function of this pin is configured in the device MTP memory. The default configuration is TXDEN. See CBUS Signal Options, Table 3.4. Table 3.3 UART Interface and CBUS Group (see note 1) Notes: 1. When used in Input Mode, the input pins are pulled to VCCIO via internal 75kΩ (approx.) resistors. These pins can be programmed to gently pull low during USB suspend (PWREN# = “1”) by setting an option in the MTP memory. Copyright © 2015 Future Technology Devices International Limited 8 FT234XD USB TO BASIC UART IC Version 1.2 Document No.: FT_000753 Clearance No.: FTDI#324 3.2 CBUS Signal Options The following options can be configured on the CBUS0 I/O pin. These options can be configured in the internal MTP memory using the software utility FT_PROG which can be downloaded from the FTDI Utilities (www.ftdichip.com). The default configuration is described in Section 8. CBUS Signal Option CBUS Pin TRI-STATE CBUS0 IO Pad is tri-stated DRIVE 1 CBUS0 Output a constant 1 DRIVE 0 CBUS0 Output a constant 0 TXDEN CBUS0 Enable transmit data for RS485 PWREN# CBUS0 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. TXLED# CBUS0 Transmit data LED drive – pulses low when transmitting data via USB. See Section 7.5 for more details. RXLED# CBUS0 Receive data LED drive – pulses low when receiving data via USB. See Section 7.5 for more details. TX&RXLED# CBUS0 LED drive – pulses low when transmitting or receiving data via USB. See Section 7.5 for more details. SLEEP# CBUS0 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 CBUS0 24 MHz Clock output.* CLK12MHz CBUS0 12 MHz Clock output.* CLK6MHz CBUS0 6 MHz Clock output.* GPIO CBUS0 CBUS bit bang mode option. Allows the CBUS pin to be used as general purpose I/O. Configured in the internal MTP memory. A separate application note, AN232R-01, available from FTDI website (www.ftdichip.com) describes in more detail how to use CBUS bit bang mode. BCD Charger CBUS0 Battery Charging Detection indicates when the device is connected to a dedicated battery charger host. Active high output. BCD Charger# CBUS0 Inverse of BCD Charger BitBang_WR# CBUS0 Synchronous and asynchronous bit bang mode WR# strobe output. BitBang_RD# CBUS0 Synchronous and asynchronous bit bang mode RD# strobe output. VBUS Sense CBUS0 Input to detect when VBUS is present. Time Stamp CBUS0 Toggle signal which changes state each time a USB Description Copyright © 2015 Future Technology Devices International Limited 9 FT234XD USB TO BASIC UART IC Version 1.2 Document No.: FT_000753 Clearance No.: FTDI#324 CBUS Signal Option CBUS Pin Description SOF is received Keep_Awake# CBUS0 Prevents the device from entering suspend state when unplugged. Table 3.4 CBUS Configuration Control *When in USB suspend mode the outputs clocks are also suspended. Copyright © 2015 Future Technology Devices International Limited 10 FT234XD USB TO BASIC UART IC Version 1.2 Document No.: FT_000753 Clearance No.: FTDI#324 4 Function Description The FT234XD is a compact USB to a basic serial UART interface device which simplifies USB implementations in a small optimised package. The device reduces external component count by fully integrating 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-OnReset (POR) and LDO regulators. Configurable CBUS I/O Pin Options. The fully integrated MTP memory allows configuration of the Control Bus (CBUS) functionality and drive strength selection. There is one CBUS I/O pin CBUS0. The configurable options of CBUS0 are detailed in section 3.2 The CBUS line 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 with RD# and WR# Strobes. The FT234XD supports FTDI’s previous chip generation bit-bang mode. In bit-bang mode, the four UART lines can be switched from the regular interface mode to a 4-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-scalar). Either the internal RD# or the internal WR# strobe signal can mapped to the CBUS0 pin (only one CBUS pin available) which can be used to allow external logic to be clocked by access to the bit-bang I/O bus. This option will be described more fully in a separate application note available from FTDI website (www.ftdichip.com). Synchronous Bit Bang Mode. The FT234XD 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. Source Power and Power Consumption. The FT234XD 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 the UART interface allows the FT234XD to interface to UART logic running at +1.8V to +3.3V (5V tolerant). 4.2 Functional Block Descriptions The following paragraphs detail each function within the FT234XD. Please refer to the block diagram shown in Figure 2.1 Internal MTP Memory. The internal MTP memory in the FT234XD is used to store USB Vendor ID (VID), Product ID (PID), device serial number, product description string and various other USB configuration descriptors. The internal MTP memory is also used to configure the CBUS pin functions. The FT234XD 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). +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. +1.8V LDO Regulator. The +1.8V LDO regulator generates the +1.8V reference voltage for internal use driving the IC core functions of the serial interface engine and USB protocol engine. Copyright © 2015 Future Technology Devices International Limited 11 FT234XD USB TO BASIC UART IC Version 1.2 Document No.: FT_000753 Clearance No.: FTDI#324 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 UART FIFO controller blocks. Clock Multiplier / Divider. The Clock Multiplier / Divider takes the 12MHz input from the Internal Oscillator function and generates the 48MHz, 24MHz, 12MHz and 6MHz reference clock signals. 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 UART in accordance with the USB 2.0 specification chapter 9. FIFO RX Buffer (512 bytes). Data sent from the USB host controller to the UART via the USB data OUT endpoint is stored in the FIFO RX (receive) buffer. Data is removed from the buffer to the UART transmit register under control of the UART FIFO controller. (Rx relative to the USB interface). FIFO TX Buffer (512 bytes). Data from the UART receive register is stored in the TX 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). UART FIFO Controller. The UART FIFO controller handles the transfer of data between the FIFO RX and TX buffers and the UART transmit and receive registers. UART Controller with Programmable Signal Inversion and High Drive. Together with the UART FIFO Controller the UART Controller handles the transfer of data between the FIFO RX and FIFO TX buffers and the UART transmit and receive registers. It performs asynchronous 7 or 8 bit parallel to serial and serial to parallel conversion of the data on the RS232 (or RS422 or RS485) interface. Control signals supported by UART mode include RTS, CTS. The UART Controller also provides a transmitter enable control signal pin option (TXDEN) to assist with interfacing to RS485 transceivers. RTS/CTS and XON / XOFF handshaking options are also supported. Handshaking is handled in hardware to ensure fast response times. The UART interface also supports the RS232 BREAK setting and detection conditions. Additionally, the UART signals can each be individually inverted and have a configurable high drive strength capability (using FT_PROG). Both these features are configurable in the MTP memory. Baud Rate Generator - The Baud Rate Generator provides a 16x clock input to the UART Controller from the 48MHz reference clock. It consists of a 14 bit pre-scalar and 3 register bits which provide fine tuning of the baud rate (used to divide by a number plus a fraction or “sub-integer”). This determines the baud rate of the UART, which is programmable from 183 baud to 3 Mbaud. The FT234XD supports all standard baud rates and non-standard baud rates from 183 Baud up to 3 Mbaud. Achievable non-standard baud rates are calculated as follows Baud Rate = 3000000 / (n + x) Where ‘n’ can be any integer between 2 and 16,384 (= 2 ) and ‘x’ can be a sub-integer of the value 0, 0.125, 0.25, 0.375, 0.5, 0.625, 0.75, or 0.875. When n = 1, x = 0, i.e. baud rate divisors with values between 1 and 2 are not possible. 14 This gives achievable baud rates in the range 183.1 baud to 3,000,000 baud. When a non-standard baud rate is required simply pass the required baud rate value to the driver as normal, and the FTDI driver will calculate the required divisor, and set the baud rate. See FTDI application note AN232B-05 on the FTDI website (www.ftdichip.com) for more details. Copyright © 2015 Future Technology Devices International Limited 12 FT234XD USB TO BASIC UART IC Version 1.2 Document No.: FT_000753 Clearance No.: FTDI#324 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 FT234XD. RESET# can be tied to VCC or left unconnected if not being used. Copyright © 2015 Future Technology Devices International Limited 13 FT234XD USB TO BASIC UART IC Version 1.2 Document No.: FT_000753 Clearance No.: FTDI#324 5 Devices Characteristics and Ratings 5.1 Absolute Maximum Ratings The absolute maximum ratings for the FT234XD 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 FT234XD 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-directional (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. Copyright © 2015 Future Technology Devices International Limited 14 FT234XD USB TO BASIC UART IC Version 1.2 Document No.: FT_000753 Clearance No.: FTDI#324 5.2 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 6.5 8 8.3 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 5.2 Operating Voltage and Current Copyright © 2015 Future Technology Devices International Limited 15 FT234XD USB TO BASIC UART IC Version 1.2 Document No.: FT_000753 Clearance No.: FTDI#324 Parameter Description Minimum Typical Maximum Units Conditions 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 Ioh = +/-2mA Voh Output Voltage High 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 0.8 V LVTTL V LVTTL LVTTL 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 Ioz 2.0 Tri-state output leakage -10 +/-1 10 μA Vin = 5.5V or 0 current Table 5.3 I/O Pin Characteristics VCCIO = +3.3V (except USB PHY pins) * The I/O drive strength and slow slew-rate are configurable in the MTP memory. Copyright © 2015 Future Technology Devices International Limited 16 FT234XD USB TO BASIC UART IC Version 1.2 Document No.: FT_000753 Clearance No.: FTDI#324 Parameter Description Minimum Typical Maximum Units Conditions 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 Ioh = +/-2mA Voh Output Voltage High 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 0.8 V LVTTL V LVTTL LVTTL 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 Ioz 0.8 Tri-state output leakage -10 +/-1 10 μA Vin = 5.5V or 0 current Table 5.4 I/O Pin Characteristics VCCIO = +2.5V (except USB PHY pins) * The I/O drive strength and slow slew-rate are configurable in the MTP memory. Copyright © 2015 Future Technology Devices International Limited 17 FT234XD USB TO BASIC UART IC Version 1.2 Document No.: FT_000753 Clearance No.: FTDI#324 Parameter Description Minimum Typical Maximum Units Conditions 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 Ioh = +/-2mA Voh Output Voltage High 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 Ioz 1.6 Tri-state output leakage -10 +/-1 10 μA Vin = 5.5V or 0 current Table 5.5 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. Copyright © 2015 Future Technology Devices International Limited 18 FT234XD USB TO BASIC UART IC Version 1.2 Document No.: FT_000753 Clearance No.: FTDI#324 Parameter Description Minimum Voh Output Voltage High VCC-0.2 Vol Output Voltage Low Vil Input low Switching Threshold Vih Input High Switching Threshold Typical Maximum Conditions V 2.0 Units 0.2 V 0.8 V - V Table 5.6 USB I/O Pin (USBDP, USBDM) Characteristics 5.3 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 5.7 MTP Memory Characteristics 5.4 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 5.8 Internal Clock Characteristics Note 1: Equivalent to +/-1667ppm Copyright © 2015 Future Technology Devices International Limited 19 FT234XD USB TO BASIC UART IC Version 1.2 Document No.: FT_000753 Clearance No.: FTDI#324 6 USB Power Configurations The following sections illustrate possible USB power configurations for the FT234XD. The illustrations have omitted pin numbers for ease of understanding since the pins differ between the FT234XDS and FT234XDQ package options. All USB power configurations illustrated apply to both package options for the FT234XD device. Please refer to Section 9 for the package option pin-out and signal descriptions. 6.1 USB Bus Powered Configuration VCC Ferrite Bead 1 VCC 27R 2 USBDM 3 27R USBDP 4 47pF 47pF FT234XD 5 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 FT234XD 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 CBUS pin configured as PWREN# and use it 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 FT234XD 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 FT234XD 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 Laird Technologies (http://www.lairdtech.com) for example Laird Technologies Part # MI0805K601R-10. Copyright © 2015 Future Technology Devices International Limited 20 FT234XD USB TO BASIC UART IC Version 1.2 Document No.: FT_000753 Clearance No.: FTDI#324 6.2 Self Powered Configuration VCC(3.3-5.25V) 1 VCC 27R 2 USBDM 3 27R USBDP 4 47pF 47pF 4k7 FT234XD 5 VBUS_SENSE SHIELD VCCIO RESET# 10k GND AG ND 3V3OUT GND GN D GND VCC 100nF 100nF 100nF + 4.7uF GND GND Figure 6.2 Self Powered Configuration Figure 6.2 illustrates the FT234XD 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) A self powered device should not force current down the USB bus when the USB host or hub controller is powered down. ii) 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. iii) 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 FT234XD 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 FT2234XD 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 FT234XD 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 6.2 illustrates a self powered design which has a +3.3V to +5.25V supply. Note: 1. When the FT234XD is in reset, the UART interface I/O pins are tri-stated. Input pins have internal 75kΩ pull-up resistors to VCCIO, so they will gently pull high unless driven by some external logic. Copyright © 2015 Future Technology Devices International Limited 21 FT234XD USB TO BASIC UART IC Version 1.2 Document No.: FT_000753 Clearance No.: FTDI#324 6.3 USB Bus Powered with Power Switching Configuration P Channel Power MOSFET Switched 5V Power to External Logic 0.1uF 100k 0.1uF 1k PWREN# Ferrite Bead 1 VCC 27R 2 USBDM 3 27R USBDP 4 47pF 47pF FT234XD 5 SHIELD RESET# 10nF VCCIO GND GND VCC CBUS0 GN D AG ND 3V3OUT 100nF + 4.7uF 100nF GND GND Figure 6.3 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 FT234XD provides a simple but effective method of turning off power during the USB suspend mode. Figure 6.3 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 FT234XD or the USB host/hub controller. The soft start circuit example shown in Figure 6.3 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 FT234XD MTP memory. iii) The CBUS0 Pin should be configured as PWREN# in the internal FT234XD MTP memory, and used to switch the power supply 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 FT234XD MTP memory. A high-power bus powered application uses the descriptor in the internal FT234XD 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 © 2015 Future Technology Devices International Limited 22 FT234XD USB TO BASIC UART IC Version 1.2 Document No.: FT_000753 Clearance No.: FTDI#324 7 Application Examples The following sections illustrate possible applications of the FT234XD. 7.1 USB to RS232 Converter VBUS CN1 VBUS DD+ GND 1 2 3 4 GND R2 27R R3 27R 1 12 2 USB C4 C5 C6 C7 10nF 47pF 47pF 10nF 3V3OUT USBDM USBDP RESET# 0.1uF C10 9 U1 3 VCCIO 0.1uF GND C3 FB1 600R/0.5A U2 C9 4 GND R5 10k VCC 10k GND R1 0.1uF 5 C2 4.7uF 13 C1 TXD RXD RTS# CTS# CBUS0 7 10 8 11 6 TXD RXD RTS# CTS# 2 4 5 6 C1+ C1C2+ C2- C8 VCC V+ V- 0.1uF 13 SLEEP# FT234XD 19 3 7 0.1uF C11 0.1uF C12 0.1uF GND 17 TXD_RS232 12 8 RTS_RS232 15 16 RXD_RS232 10 9 CTS_RS232 1 11 18 20 14 EN NC GND SHDN NC ZT3222F GND GND GND GND GND GND Figure 7.1 Application Example showing USB to RS232 Converter An example of using the FT234XD as a USB to RS232 converter is illustrated in Figure 7.1. In this application, a 3V3 TTL to RS232 Level Converter IC is used on the serial UART interface of the FT234XD to convert the 3V3 levels of the FT234XD to RS232 levels. This level shift can be done using line drivers from a variety of vendors e.g. Zywyn. A useful feature on some of these devices is the SHDN# pin which can be used to power down the device to a low quiescent current during USB suspend mode. A suitable level shifting device is the Zywyn ZT3222F which is capable of RS232 communication at up to 1000k baud. Copyright © 2015 Future Technology Devices International Limited 23 FT234XD USB TO BASIC UART IC Version 1.2 Document No.: FT_000753 Clearance No.: FTDI#324 7.2 USB to RS485 Coverter VBUS C1 C2 R1 4.7uF 0.1uF 10k C8 GND R2 R3 27R 27R 1 12 2 USB GND C4 C5 C6 C7 10nF 47pF 47pF 10nF GND GND GND USBDM USBDP RESET# 9 VCCIO 1 2 3 4 GND VBUS DD+ GND 3V3OUT 13 U1 3 VCC 0.1uF CN1 GND FB1 600R/0.5A 5 C3 4 0.1uF GND GND TXD RXD RTS# CTS# CBUS0 7 10 8 11 TXD RXD 6 TXDEN U2 1 2 3 4 RO VCC R RE DE D DI FT234XD GND GND 8 7 6 Data Data + 5 ZT485EEN GND Figure 7.2 Application Example Showing USB to RS485 Converter An example of using the FT234XD as a USB to RS485 converter is shown in Figure 7.2. In this application, a 3V3-TTL to RS485 level converter IC is used on the serial UART interface of the FT234XD to convert the TTL levels of the FT234XD to RS485 levels. This example uses the Zywyn ZT485EEN device. Equivalent devices are available from Maxim and Analogue Devices. The ZT485EEN is a RS485 device in a compact 8 pin SOP package. It has separate enables on both the transmitter and receiver. With RS485, the transmitter is only enabled when a character is being transmitted from the UART The TXDEN signal CBUS pin option on the FT234XD is provided for exactly this purpose and so the transmitter enable is wired to CBUS which has been configured as TXDEN. Note that the TXDEN is activated 1 bit period before the start bit. TXDEN is deactivated at the same time as the stop bit. This is not configurable. RS485 is a multi-drop network; so many devices can communicate with each other over a two wire cable interface. The RS485 cable requires to be terminated at each end of the cable. A link (which provides the 120Ω termination) allows the cable to be terminated if the ZT3485 is physically positioned at either end of the cable. Copyright © 2015 Future Technology Devices International Limited 24 FT234XD USB TO BASIC UART IC Version 1.2 Document No.: FT_000753 Clearance No.: FTDI#324 7.3 USB to RS422 Converter Q1 IRLML6402 VBUS CN1 VBUS DD+ GND 1 2 3 4 GND R2 27R R3 27R 1 12 2 USB GND C4 C5 C6 C7 10nF 47pF 47pF 10nF GND GND GND 3V3OUT USBDM USBDP RESET# U2 1 3 R4 2k 9 U1 3 VCCIO 0.1uF GND C3 FB1 600R/0.5A C8 0.1uF 4 GND R5 10k VCC 10k GND R1 0.1uF 5 C2 4.7uF 13 C1 TXD RXD RTS# CTS# CBUS0 7 10 8 11 TXD RXD RTS# CTS# 6 PWREN# 2 4 VCC DI D RO GND GND R Z Y A B 6 5 8 7 TxDTxD+ RxD+ RxDR6 120R ZT490E U3 1 3 2 4 FT234XD C9 VCC DI D RO GND R Z Y A B 6 5 8 7 RTSRTS+ CTS+ CTSR7 120R ZT490E 0.1uF GND GND Figure 7.3 USB to RS422 Converter Configuration An example of using the FT234XD as a USB to RS422 converter is shown in Figure 7.3. In this application, two TTL to RS422 Level Converter ICs are used on the serial UART interface of the FT234XD to convert the TTL levels of the FT234XD to RS422 levels. There are many suitable level converter devices available. This example uses Zywyn ZT490E devices. P-Channel MOSFET connected in the VCC line of ZT490E ensures that USB standby current of 2.5mA is not exceeded. The ZT490E is specified to transmit and receive data at a rate of up to 10 Mbaud. In this example the maximum data rate is limited to 3 Mbaud by the FT234XD. Copyright © 2015 Future Technology Devices International Limited 25 FT234XD USB TO BASIC UART IC Version 1.2 Document No.: FT_000753 Clearance No.: FTDI#324 7.4 USB Battery Charging Detection A recent addition to the USB specification (http://www.usb.org/developers/docs/devclass_docs/BCv1.2_070312.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 FT234XD 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 FT234XD 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 Battery Options Battery Charger Enable X Force Power Enable 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 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 7.4 USB Battery Charging Detection To use the FT234XD with battery charging detection the CBUS0 pin must be reprogrammed to allow for the BCD Charger output to switch the external charger circuitry on. The CBUS0 pin is configured in the internal MTP memory with the free utility FT_PROG. If the charging circuitry requires an active low signal to enable it, the CBUS0 pin can be programmed to BCD Charger# as an alternative. Copyright © 2015 Future Technology Devices International Limited 26 FT234XD USB TO BASIC UART IC Version 1.2 Document No.: FT_000753 Clearance No.: FTDI#324 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. To calculate the equivalent resistance on the 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 FT234XD 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. 7.5 LED Interface The CBUS0 I/O pin can be configured to drive an LED. The FT234XD has 3 configuration options for driving LEDs from the CBUS. These are TXLED#, RXLED#, and TX&RXLED#. Refer to Section 3.2 for configuration options. VCCIO 270R FT234XD CBUS0 TX & RXLED# Figure 7.5 Single LED Configuration An example of using the FT234XD to drive an LED is shown in Figure 7.57. In this example the CBUS0 pin is used to indicate when data is being transmitted or received by the device (TX&RXLED). In this configuration the FT234XD will drive only a single LED. Copyright © 2015 Future Technology Devices International Limited 27 FT234XD USB TO BASIC UART IC Version 1.2 Document No.: FT_000753 Clearance No.: FTDI#324 8 Internal MTP Memory Configuration The FT234XD 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 FT234XD 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 FT234XD 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 UART interface lines when in USB suspend mode (PWREN# is high). Manufacturer Name FTDI Product Description FT234XD BASIC UART Max Bus Power Current 90mA Power Source Bus Powered Device Type FT234XD 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 DBUS Drive Current Strength 4mA Options are 4mA, 8mA, 12mA, 16mA DBUS slew rate Slow Options are slow or fast DBUS Schmitt Trigger Normal Taking RI# low will wake up the USB host controller from suspend in approximately 20 ms. Options are normal or Schmitt Copyright © 2015 Future Technology Devices International Limited 28 FT234XD USB TO BASIC UART IC Version 1.2 Document No.: FT_000753 Clearance No.: FTDI#324 Parameter Value Notes Enable 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 Load VCP Driver Enabled** CBUS0 TXDEN Invert TXD Disabled Signal on this pin becomes TXD# if enable. Invert RXD Disabled Signal on this pin becomes RXD# if enable. Invert RTS# Disabled Signal on this pin becomes RTS if enable. Invert CTS# Disabled Signal on this pin becomes CTS if enable. Options are normal or Schmitt Makes the device load the VCP driver interface for the device. Default configuration of CBUS0 – Transmit data enable for RS485 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. 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 © 2015 Future Technology Devices International Limited 29 FT234XD USB TO BASIC UART IC Version 1.2 Document No.: FT_000753 Clearance No.: FTDI#324 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 FT234XD. 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 5.3 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 © 2015 Future Technology Devices International Limited 30 FT234XD USB TO BASIC UART IC Version 1.2 Document No.: FT_000753 Clearance No.: FTDI#324 9 Package Parameters The FT234XD is available in a DFN-12 package. The solder reflow profile is described in Section 9.2. 9.1 DFN-12 Package Mechanical Dimensions Figure 9.1 DFN-12 Package Dimensions The FT234XD is supplied in a RoHS compliant leadless DFN-12 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 3.00mm x 3.00mm. The solder pads are on a 0.45mm pitch. The above mechanical drawing shows the DFN-12 package. Refer to the WDFN column in Figure 9.13. All dimensions are in millimetres. The centre pad on the base of the FT234XD is internally connected to ground. Copyright © 2015 Future Technology Devices International Limited 31 FT234XD USB TO BASIC UART IC Version 1.2 Document No.: FT_000753 Clearance No.: FTDI#324 9.2 DFN-12 Package Markings 1 6 FTDI I XXXXXXXXXX FT234XD Q YYWW-B 12 7 Figure 9.2 DFN-12 Package Markings The date code format is YYWW where XX = 2 digit week number, WW = 2 digit year number. This is followed by the revision number. The code XXXXXXX is the manufacturing LOT code. Copyright © 2015 Future Technology Devices International Limited 32 FT234XD USB TO BASIC UART IC Version 1.2 Document No.: FT_000753 Clearance No.: FTDI#324 9.3 Solder Reflow Profile The FT234XD is supplied in a Pb free DFN-12 package. The recommended solder reflow profile is shown in Figure 9.35. 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 9.3 FT234XD 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 FT234XD is used with Pb free solder), and for a non-Pb free solder process (i.e. the FT234XD is used with non-Pb free solder). Profile Feature Pb Free Solder Process Non-Pb Free Solder Process Average Ramp Up Rate (Ts to Tp) 3°C / second Max. 3°C / Second Max. - Temperature Min (Ts Min.) 150°C 100°C - Temperature Max (Ts Max.) 200°C 150°C - Time (ts Min to ts Max) 60 to 120 seconds 60 to 120 seconds 217°C 183°C 60 to 150 seconds 60 to 150 seconds 260°C 240°C 20 to 40 seconds 20 to 40 seconds Ramp Down Rate 6°C / second Max. 6°C / second Max. Time for T= 25°C to Peak Temperature, Tp 8 minutes Max. 6 minutes Max. Preheat Time Maintained Above Critical Temperature TL: - Temperature (TL) - Time (tL) Peak Temperature (Tp) Time within 5°C of actual Peak Temperature (tp) Table 9.1 Reflow Profile Parameter Values Copyright © 2015 Future Technology Devices International Limited 33 FT234XD USB TO BASIC UART IC Version 1.2 Document No.: FT_000753 Clearance No.: FTDI#324 10 Contact Information Head Office – Glasgow, UK 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 E-mail (Sales) E-mail (Support) E-mail (General Enquiries) [email protected] [email protected] [email protected] Branch Office – Tigard, Oregon, 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) [email protected] [email protected] [email protected] Branch Office – Taipei, Taiwan Branch Office – Shanghai, China 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 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) E-mail (Sales) E-mail (Support) E-mail (General Enquiries) [email protected] [email protected] [email protected] [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 © 2015 Future Technology Devices International Limited 34 FT234XD USB TO BASIC UART IC Version 1.2 Document No.: FT_000753 Clearance No.: FTDI#324 Appendix A – References Useful Application Notes http://www.ftdichip.com/Support/Documents/AppNotes/AN_232R01_Bit_Bang_Mode_Available_For_FT232R_and_Ft245R.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.ftdichip.com/Support/Documents/ProgramGuides/D2XX_Programmer's_Guide(FT_000071).p df http://www.usb.org/developers/docs/devclass_docs/BCv1.2_070312.zip Copyright © 2015 Future Technology Devices International Limited 35 FT234XD USB TO BASIC UART IC Version 1.2 Document No.: FT_000753 Clearance No.: FTDI#324 Appendix B - List of Figures and Tables List of Figures Figure 2.1 FT234XD Block Diagram ................................................................................................. 4 Figure 3.1 DFN Schematic Symbol .................................................................................................. 7 Figure 6.1 Bus Powered Configuration ........................................................................................... 20 Figure 6.2 Self Powered Configuration ........................................................................................... 21 Figure 6.3 Bus Powered with Power Switching Configuration ............................................................ 22 Figure 7.1 Application Example showing USB to RS232 Converter ..................................................... 23 Figure 7.2 Application Example Showing USB to RS485 Converter .................................................... 24 Figure 7.3 USB to RS422 Converter Configuration ........................................................................... 25 Figure 7.4 USB Battery Charging Detection .................................................................................... 26 Figure 7.5 Single LED Configuration .............................................................................................. 27 Figure 8.1: Simplified memory map for the FT-X ............................................................................ 30 Figure 9.1 DFN-12 Package Dimensions ......................................................................................... 31 Figure 9.2 DFN-12 Package Markings ............................................................................................ 32 Figure 9.3 FT234XD Solder Reflow Profile ...................................................................................... 33 List of Tables Table 3.1 Power and Ground .......................................................................................................... 7 Table 3.2 Common Function pins .................................................................................................... 8 Table 3.3 UART Interface and CBUS Group (see note 1) .................................................................... 8 Table 3.4 CBUS Configuration Control ........................................................................................... 10 Table 5.1 Absolute Maximum Ratings ............................................................................................ 14 Table 5.2 Operating Voltage and Current ....................................................................................... 15 Table 5.3 I/O Pin Characteristics VCCIO = +3.3V (except USB PHY pins) ........................................... 16 Table 5.4 I/O Pin Characteristics VCCIO = +2.5V (except USB PHY pins) ........................................... 17 Table 5.5 I/O Pin Characteristics VCCIO = +1.8V (except USB PHY pins) ........................................... 18 Table 5.6 USB I/O Pin (USBDP, USBDM) Characteristics .................................................................. 19 Table 5.7 MTP Memory Characteristics........................................................................................... 19 Table 5.8 Internal Clock Characteristics ......................................................................................... 19 Table 8.1 Default Internal MTP Memory Configuration ..................................................................... 29 Table 9.1 Reflow Profile Parameter Values ..................................................................................... 33 Copyright © 2015 Future Technology Devices International Limited 36 FT234XD USB TO BASIC UART IC Version 1.2 Document No.: FT_000753 Clearance No.: FTDI#324 Appendix C - Revision History Document Title: USB to BASIC UART IC FT234XD Document Reference No.: FT_000753 Clearance No.: FTDI#324 Product Page: http://www.ftdichip.com/FT-X.htm Document Feedback: Send Feedback Version 1.0 First release January 2013 Version 1.1 Updated TID info. Added clarification that we are 5V tolerant February 2013 Version 1.2 Added reference to WDFN chip dimensions Aug 2015 Copyright © 2015 Future Technology Devices International Limited 37