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future technology devices international ltd (ftdi) 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 (support): support1@ftdichip.com web: http://www.ftdichip.com use of ftdi devices in life s upport and/or safety applications is entirely at the users 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. copyright ? 2011 future technology devices inter national limited future technology devices international ltd UM232H single channel usb hi - speed ft232h development module datasheet doc ument ref er ence no. : ft_000367 version 1.2 issue date: 20 11 - 04 - 18
1 ? copyright 2011 future technology devices international ltd document reference no.: ft_000367 UM232H single channel usb hi - speed ft232h development module datasheet version 1.2 clearance no.: ftdi# 198 1 introduction the UM232H is a usb - to - serial/fifo development m odule in the ftdi product ra nge which utilises the ft232h usb hi - speed (480mb/s) single - port bridge chip to handle the usb signaling and protocols . the UM232H is ideal for development purposes to quickly prove functionality of adding usb to a target design. the UM232H is a module des igned to plug into a standard 0.6 wide 28 pin dip socket. the usb connection to a host system is via a mini - b usb connector. all compon ents used, including the ft232h , are pb - free (rohs compliant). figure 1 . 1 : UM232H usb to serial/fifo development module 1.1 ft232h the ft232h is a single channel usb 2.0 hi - speed (480mb /s) to serial /fifo ic. it can be configured in a variety of serial or parallel interfaces, such as uart, fifo or ftdis mpsse mode which can configure either of the following interfaces: jtag, spi and i 2 c . for mpsse mode, there is also 14 bit - banging lines available along with the four interface lines . in addition to these, the ft232h supports a cpu - style fifo mode and a fast serial interface mode. it also introduces a half - duplex ft1248 interface that provides a flexible data communication and high performance interface between the ft232h device and external l ogic. for further details on the ft232h and the ft1248 mode, please refer to the ft23 2h datasheet and application note : an_167 ft1248 parallel serial interface basics , located at the ftdi website .
2 ? copyright 2011 future technology devices international ltd document reference no.: ft_000367 UM232H single channel usb hi - speed ft232h development module datasheet version 1.2 clearance no.: ftdi# 198 table of content s 1 introduction ................................ ................................ ....................... 1 1.1 ft232h ................................ ................................ ................................ ............... 1 2 typical applications ................................ ................................ ........ 3 2.1 driver support ................................ ................................ ................................ . 3 2.2 part numbers ................................ ................................ ................................ ... 3 2.3 features ................................ ................................ ................................ ............. 4 3 ft232h features and enhancement ................................ .......... 5 3.1 key features ................................ ................................ ................................ .... 5 4 UM232H pin out and signal descriptions ................................ 7 4.1 UM232H pin out ................................ ................................ ............................. 7 4.2 signal descriptions ................................ ................................ ........................ 8 4.3 acbus signal options ................................ ................................ ................. 11 5 module dimensions ................................ ................................ ....... 12 6 ft232h device characteristics and ratings ......................... 13 6.1 dc characteristics ................................ ................................ ........................ 13 7 module configurations ................................ ................................ . 14 7.1 bus powered configuration ................................ ................................ ..... 14 7.2 usb bus powered with power swit ching configuration ............................... 15 7.3 self powered configuration ................................ ................................ ..... 16 7.3.1 self - powered configuration with 3v3 i/o and running on +5v extern al supply: ..... 16 7.3.2 self - powered configuration with 3v3 i/o and running on +3.3v external supply: .. 18 8 UM232H module circuit sch ematic ................................ .......... 19 9 eeprom configuration ................................ ................................ . 20 10 contact information ................................ ................................ ...... 21 ap pendix a C list of tables and figures ................................ ........................ 23 appendix b C revision history ................................ ........................ 24
3 ? copyright 2011 future technology devices international ltd document reference no.: ft_000367 UM232H single channel usb hi - speed ft232h development module datasheet version 1.2 clearance no.: ftdi# 198 2 typical application s the UM232H module can be used for prototypi ng and evaluation in a n application using the ft232h. rapid usb integration into existing and new electronic systems usb to multi - port jtag, spi and i 2 c interfaces usb to f t1248 interfaces usb to rs232 / rs422 / rs485 converters usb instrumentation usb industrial control usb e lectronic point of sale control upgrading legacy peripherals to usb cellular and cordless phone usb data transfer cables and interfaces interfacing mc u / pld / fpga based designs to usb usb audio and low bandwidth video data transfer pda to usb data transfer usb smart card readers usb mp3 player interface usb flash card reader / writers set top box pc - usb interface usb digital camera interface usb ha rdware modems usb wireless modems usb bar code readers usb software / hardware encryption dongles usb medical applications 2.1 driver support the UM232H development module requires usb device drivers, available free from ftdi website . there is the virtual com port driver which allows the UM232H to appear as a serial port allowing legacy applications for serial ports to function over usb (for example tty). another ftdi usb driver, the d2xx driver, can also be used with application software to directly access the ft232h on the UM232H through a dll. supported platforms include: current microsoft ? windows ? operating systems , linux ? , m ac os ? and microsoft win dows ce ? version 4.2 onwards. 2.2 part numbers part number descript ion UM232H development module for ft232h
4 ? copyright 2011 future technology devices international ltd document reference no.: ft_000367 UM232H single channel usb hi - speed ft232h development module datasheet version 1.2 clearance no.: ftdi# 198 2.3 features the um 232 h has the following features: based on the single chip usb hi - speed ft232h device. usb 2.0 hi - speed (480mbits/second) and full speed (12mbits/second) compatible entire usb protocol handled on t he chip C small usb type b connector common on many commercial devices usb bus or self powered options. asynchronous uart transfer data rate up to 12mbaud . uart interface support for 7 or 8 data bits, 1 or 2 stop bits and odd / even / mark / space / no parity. fully assisted hardware or x - on / x - off software handshaking. auto - transmit buffer control for rs485 applications. supports a half duplex ft1248 interface with a bi - directional data bus (1, 2, 4 or 8 bit s wide). synchronous serial (mpsse) data rates of up to 30mbps on jtag, spi and i2c support for usb suspend and resume uhci / ohci / ehci host controller compatible ftdis royalty 1kbyte receive and transmit buffers for high data throughput. transmit and receive led drive signals. adjustable receive buffer timeout. synchronous and asynchronous bit bang mode interface options with rd# and wr# strobes. support f or usb suspend and resume. integrated 3.3v level converter for usb i/o. usb bulk transfer mode. + 2.97 v to + 5.25v single supply operation. low operating and usb suspend current. low usb bandwidth consumption. - 40c to +85c operating temperature range reduce development time rapid integration into existing systems
5 ? copyright 2011 future technology devices international ltd document reference no.: ft_000367 UM232H single channel usb hi - speed ft232h development module datasheet version 1.2 clearance no.: ftdi# 198 3 ft232 h features and enhancement 3.1 key features usb hi - speed to uart/fifo interface . the ft232h provide s a usb 2.0 hi - speed (480mbits/s) to flexible and configurable uart/fifo interfaces. fun ctional integration . the ft232h integrates a usb protocol engine, which controls the physical universal transceiver macrocell interface (utmi) and handles all aspects of the usb 2.0 hi - speed interface. the ft232h includes an integrated +1.8v/3.3v low drop - out (ldo) regulator. it also includes 1kbytes tx and rx data buffers. the ft232h integrates the entire usb protocol on a chip with no firmware required. mpsse . multi - protocol synchronous serial engines (mpsse), capable of speeds up to 30 mbits/s, provides flexible synchronous interface configurations. ft1248 interface . the ft232h supports a half - duplex ft1248 interface with a bi - directional data bus interface that can be configured as 1, 2, 4 or 8 - bits wide and this enables the flexibility to expand the siz e of the data bus to 8 pins. the ft1248 interface provides flexible data communication between an ft232h ft1248 slave and an external ft1248 master. the ft1248 interface consists of four signals called miosio, the bi - directional data lines between the ft2 32h and an external master controller, sclk which is the external clock input for latching data in or out the device at frequency up to 30mhz, ss_n slave select input miso which is the master in slave out is an output from the ft232h in ft1248 mode. an external ft1248 master selects one of the ft1248 slave devices or enables the interface by pulling the slave select input ( ss_n ) to logic 0. the ft1248 mode can be configured via the eeprom settings with the free utility called ft_prog which can be downloaded from the ftdi utilities page. for further details about ft1248 mode, see ft232h datasheet and application note an_167 ft1248 parallel serial interface basics at the ftdi website . data transfer rate. the ft232h supports a data transfer rate up to 12 mbau d when configured as an rs232/rs422/rs485 uart interface or up to 40 mbytes/second over a synchronous 245 parallel fifo interface or up to 8 mbyte/sec over a n asynchronous 245 fifo interface. latency timer. a feature of the driver used as a timeout to tran smit short packets of data back to the pc. the default is 16ms, but it can be altered between 0 ms and 255ms. bus (acbus) functionality, signal inversion and drive strength selection. there are 11 configurable acbus i/o pins. these configurable options are : 1. txden - transmit enable for rs485 designs. 2. pwren# - power control for high power, bus powered designs. 3. txled# - for pulsing an led upon transmission of data. 4. rxled# - for pulsing an led upon receiving data. 5. tx&rxled# - which will pulse an led upon tr ansmission or reception of data . 6. sleep# - indicates that the device going into usb suspend mode. 7. clk30 / clk15 / clk7.5 - 30mhz, 15mhz and 7.5mhz clock output signal options. 8. trist - pu C input pulled up, not used 9. drive 1 C output driving high 10. drive 0 - out put driving low 11. i/o mode C acbus bit bang the acbus pins can also be individually configured as gpio pins, similar to asynchronous bit bang mode. it is possible to use this mode while the uart interface is being used, thus providing up to 4 general purpos e i/o pins which are available during normal operation. the acbus lines can be configured with any one of these input/output options by setting bits in the external eeprom multi - purpose uart/fifo controllers. the ft232h has one independent serial /fifo co ntroller. this controls the uart data, 245 fifo data, fast serial (opto isolation) or bit - bang mode which can be selected by setup (setbitmode) command. each multi - purpose uart/fifo controller also contains an mpsse
6 ? copyright 2011 future technology devices international ltd document reference no.: ft_000367 UM232H single channel usb hi - speed ft232h development module datasheet version 1.2 clearance no.: ftdi# 198 ( multi - protocol synchronous serial engi ne). using this mpsse, the multi - purpose serial /fifo controller can be configured under software command, to have one of the mpsse interfaces (spi, i 2 c, and jtag ). usb protocol engine and fifo control. the usb protocol engine controls and manages the inter face between the utmi phy and the fifos of the chip. it also handles power management and the usb protocol specification. port fifo tx buffer (1kbytes). data from the host pc is stored in these buffers to be used by the multi - purpose uart/fifo controllers. this is controlled by the usb protocol engine and fifo control block. port fifo rx buffer (1kbytes). data from the multi - purpose serial /fifo controllers is stored in these blocks to be sent back to the host pc when requested. this is controlled by the usb protocol engine and fifo control block. reset generator C 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 ft232h. reset# shou ld be tied to vccio (+3.3v) if not being used. baud rate generators C the baud rate generators provides a x16 or a x10 clock input to the uarts from a 120mhz reference clock and consists of a 14 bit prescaler and 4 register bits which provide fine tuning of the baud rate (used to divide by a number plus a fraction). this determines the baud rate of the uart, which is programmable from 183 baud to 12 mbaud. see ftdi application note an_120 on the ftdi website for mo re details. eeprom interface . if the external eeprom is fitted, the ft232h can be configured as an asynchronous serial uart (default mode), parallel fifo (245) mode, ft1248 , fast serial (opto isolation) or cpu - style fifo. the eeprom should be a 16 bit wi de configuration such as a 93lc56b or equivalent capable of a 1mbit/s clock rate at vccio = +2.97v to 3.63v. the eeprom is programmable in - circuit over usb using a utility program called ft_prog available from ftdi web site. +1.8/3.3v ldo regulator. the +3.3/+1.8v ldo regulator generates +1.8 volts for the core and the usb transceiver cell and +3.3v for the io and the internal pll and usb phy power supply. utmi phy . the universal transceiver macrocell interface (utmi) physical interface cell. this block handles the full speed / hi - speed serdes (serialise C deserialise) function for the usb tx/rx data. it also provides the clocks for the re st of the chip. a 12 mhz crystal must be connected to the osci and osco pins or 12 mhz oscillator must be connected to the osci, and the osco is left unconnected. a 12k ohm resistor should be connected between ref and gnd on the pcb. the utmi phy functions include: supports 480 mbit/s hi - speed (hs)/ 12 mbit/s full speed (fs). sync/eop generation and checking data and clock recovery from serial stream on the usb. bit - stuffing/unstuffing; bit stuff error detection. manages usb resume, wake up and suspend functions. single parallel data clock output with on - chip pll to generate higher speed serial data clocks.
7 ? copyright 2011 future technology devices international ltd document reference no.: ft_000367 UM232H single channel usb hi - speed ft232h development module datasheet version 1.2 clearance no.: ftdi# 198 4 UM232H pin out and signal descriptions 4.1 UM232H pin out the signal labels and pin designators for each are pin of the UM232H are illustrated in fig. 4.1. figure 4 . 1 : module pin out f t d i 2 0 1 1 j 2 - 1 C s l d g n d a d 0 p u 1 p u 2 3 v 3 a d 1 a d 4 a d 3 j 2 - 1 4 C a d 7 v i o a d 2 a d 5 a d 6 g n d C j 1 - 1 a c 8 a c 7 a c 9 r s t # u s b a c 6 a c 3 a c 4 a c 0 C j 1 - 1 4 5 v 0 a c 5 a c 2 a c 1 g n d
8 ? copyright 2011 future technology devices international ltd document reference no.: ft_000367 UM232H single channel usb hi - speed ft232h development module datasheet version 1.2 clearance no.: ftdi# 198 4.2 signal descriptions pins marked * are eeprom selectable table 4 . 1 : UM232H signals pins marked ** default to tri - stated inputs with an internal 75k (approx) pull up resistor to vcc io. pin marked * ** default to gpio line with an internal 75k pull down resistor to gnd . using the eeprom this pin can be enabled usbvcc mode instead of gpio mode. ft232h pin pin functions (depends on configuration) pin # pin name async serial (rs232) sync 245 fifo sty le async 245 fifo async bit - bang sync bit - bang mpsse fast serial interface cpu style fifo ft1248 13 adbus0 txd d0 d0 d0 d0 tck/sk fsdi d0 miosi0 14 adbus1 rxd d1 d1 d1 d1 tdi/do fsclk d1 miosi1 15 adbus2 rts# d2 d2 d2 d2 tdo/di fsdo d2 miosi2 16 adbus3 cts# d3 d3 d3 d3 tms/cs fscts d3 miosi3 17 adbus4 dtr# d4 d4 d4 d4 gpiol0 ** trist - up d4 miosi4 18 adbus5 dsr# d5 d5 d5 d5 gpiol1 ** trist - up d5 miosi5 19 adbus6 dcd# d6 d6 d6 d6 gpiol2 ** trist - up d6 miosi6 20 adbus7 ri# d7 d7 d7 d7 gpiol3 ** t rist - up d7 miosi7 21 acbus0 * txden rxf# rxf# acbus0 acbus0 gpioh0 ** acbus0 cs# sclk 25 acbus1 ** acbus1 txe# txe# wrstb# wrstb# gpioh1 ** acbus1 a0 ss_n 26 acbus2 ** acbus2 rd# rd# rdstb# rdstb# gpioh2 ** acbus2 rd# miso 27 acbus3 * rxled# wr wr acbu s3 acbus3 gpioh3 ** acbus3 wr acbus3 28 acbus4 * txled# siwu# siwu# siwu# siwu# gpioh4 siwu# siwu# acbus4 29 acbus5 ** acbus5 clkout acbus5 ** acbus5 ** acbus5 gpioh5 ** acbus5 ** acbus5 acbus5 30 acbus6 ** acbus6 oe# acbus6 acbus6 acbus6 gpioh6 ** acbu s6 ** acbus6 acbus6 31 acbus7 pwrsav# pwrsav# pwrsav# pwrsav# pwrsav# *** gpioh7 pwrsav# pwrsav# pwrsav# 32 acbus8 ** acbus8 ** acbus8 ** acbus8 ** acbus8 ** acbus8 ** acbus8 ** acbus8 ** acbus8 acbus8 33 acbus9 ** acbus9 ** acbus9 ** acbus9 ** acbus9 * * acbus9 ** acbus9 ** acbus9 ** acbus9 acbus9
9 ? copyright 2011 future technology devices international ltd document reference no.: ft_000367 UM232H single channel usb hi - speed ft232h development module datasheet version 1.2 clearance no.: ftdi# 198 the following 2 tables provide a description of the signals available on each pin of the UM232H module pin no. name type description j1 - 1 gnd pwr module ground supply pins j1 - 2 5v0 input +5.0v or +3.3v power supply input. j1 - 3 usb output 5v power output usb port. for a low power usb bus powered design, up to 100ma can be sourced fr om the 5v supply on the usb bus. a maximum of 500ma can be sourced from the usb bus in a high power usb bus powered design. j1 - 4 rst# input can be used by an external device to reset the ft232h. if not required can be left unconnected, or pulled up to vcc io j1 - 5 ac9 i/o configurable acbus i/o pin. function of this pin is configured by eeprom. the default configuration is trist - pu. see acbus signal options, table 4. 3 j1 - 6 ac8 i/o configurable acbus i/o pin. function of this pin is configured by eeprom. t he default configuration is trist - pu. see acbus signal options, table 4. 3 j1 - 7 ac7 i/o configurable acbus i/o pin. function of this pin is configured by eeprom. the default configuration is trist - p d . see acbus signal options, table 4. 3 j1 - 8 ac6 i/o con figurable acbus i/o pin. function of this pin is configured by eeprom. the default configuration is trist - pu. see acbus signal options, table 4. 3 j1 - 9 ac5 i/o configurable acbus i/o pin. function of this pin is configured by eeprom. the default configurat ion is trist - pu. see acbus signal options, table 4. 3 j1 - 10 ac4 i/o configurable acbus i/o pin. function of this pin is configured by eeprom. the default configuration is trist - pu. see acbus signal options, table 4. 3 j1 - 11 ac3 i/o configurable acbus i/o p in. function of this pin is configured by eeprom. the default configuration is trist - pu. see acbus signal options, table 4. 3 j1 - 12 ac2 i/o configurable acbus i/o pin. function of this pin is configured by eeprom. the default configuration is trist - pu. see acbus signal options, table 4. 3 j1 - 13 ac1 i/o configurable acbus i/o pin. function of this pin is configured by eeprom. the default configuration is trist - pu. see acbus signal options, table 4. 3 j1 - 14 ac0 i/o configurable acbus i/o pin. function of this pin is configured by eeprom. the default configuration is trist - pu. see acbus signal options, table 4. 3 table 4 . 2 : UM232H connector j1 signal description
10 ? copyright 2011 future technology devices international ltd document reference no.: ft_000367 UM232H single channel usb hi - speed ft232h development module datasheet version 1.2 clearance no.: ftdi# 198 pin no. name type description j2 - 1 sld shi eld to gnd usb cable shield shorted to gnd via a 0? resistor . j2 - 2 vio pwr 1.8 to +3.3v supply to the uart interface and acbus i/o pins j2 - 3 3v3 output/input +3.3v output from the integrated l.d.o. regulator if the UM232H is running on 5v self or bus powered designs . therefore t his pin can be used to supply the ft232hls vccio pi n by connecting this pin to j 2 - 2 (vio). this pin can also be an input if the UM232H is running on 3.3v self powered designs . j2 - 4 pu 2 control pull up resistor pin connection 1. connect to j1 - 3 (usb) in a self powered configuration. j2 - 5 pu 1 control pull up resistor pin connection 2. connect to j1 - 4 (rst#) in a self powered configuration. j2 - 6 gnd pwr module ground supply pins j2 - 7 ad0 output configurable output pin, the default configuration is trans mit asynchronous data output / handshake signal.. j2 - 8 ad1 input configurable input pin, the default configuration is receiving asynchronous data input / handshake signal.. j2 - 9 ad2 output configurable output pin, the default configuration is request to send control output / handshake signal. j2 - 10 ad3 input configurable input pin, the default configuration is clear to send control input / handshake signal. j2 - 11 ad4 output configurable output pin, the default configuration is data terminal ready contro l output / handshake signal. j2 - 12 ad5 input configurable input pin, the default configuration is data set ready control input / handshake signal. j2 - 13 ad6 input configurable input pin, the default configuration is data carrier detect control input / ha ndshake signal.. j2 - 14 ad7 input configurable input pin, the default configuration is ri#, ring indicator control input/ handshake signal. when remote wake up is enabled in the eeprom taking ri# low >20ms can be used to resume the pc usb host controller from suspend. table 4 . 3 : UM232H connector j2 signal description notes: 1. when used in input mode, the input pins are pulled to vccio via internal 75k ( approx. ) resistors. these pins can be programmed to gently pull low during usb suspend (pwren# = 1) by setting an option in the eeprom.
11 ? copyright 2011 future technology devices international ltd document reference no.: ft_000367 UM232H single channel usb hi - speed ft232h development module datasheet version 1.2 clearance no.: ftdi# 198 4.3 a cbus signal options the table below describes the eeprom options which can be configured on the a cbus i/o pin s using the software utility ft_prog ( which can be downloaded from the ftdi utilities page ) the default eeprom configuration is described in section 9 . acbus signal option available on acbus pin description txden acbus0, acbus1, acbus2, acbus3, acbus4, acbus5, acbus6 , acbus8, acbus9 txden = (ttl level). used with rs485 level converters to enable the line driver during data transmit. txden is active from one - bit time before the start bit is transmitted on txd until one bit time after the last stop bit. *pwren# acbus0, acbus1, acbus2, acbus3, acbus4, acbus5, acbus6 , acbus8, acbus9 output is low after the device has been configured by usb, then high during usb suspend mode. this ou tput 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# acbus0, acbus1, acbus2, acbus3, acbus4, acbus5, acbus6 , acbus8, acbus9 txled = transmit signalling output. pulses low when transmitting data (txd) to the external device. this can be connected to an led. rxled# acbus0, acbus1, acbus2, acbus3, acbus4, acbus5, acbus6 , acbus8, acbus9 rxled = receive signalling output. pulses low when receiving data (rxd) from the external device. this can be connected to an led. tx&rxled# acbus0, acbus1, acbus2, acbus3, acbus4, acbus5, acbus6 , acbus8, acbus9 led drive C pulses low when transmitting or receiving data from or to the ext ernal device. for more details, refer to the ft232h datasheet on the ftdi website . sleep# acbus0, acbus1, acbus2, acbus3, acbus4, acbus5, acbus6 , acbus8, acbus9 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. **clk30 acbus0, acbus5, acbus6,acbus8, acbus9 30mhz clock output. **clk15 acbus0, acbus5, acbus6,acbus8, acbus9 15mhz clock output. **clk7.5 acbus0, acbus 5, acbus6,acbus8, acbus9 7.5mhz clock output. trist - pu acbus0, acbus1, acbus2, acbus3, acbus4, acbus5, acbus6 , acbus8, acbus9 input pull up drive 1 acbus0, acbus5, acbus6,acbus8, acbus9 output high drive 0 acbus0, acbus1, acbus2, acbus3, acbus4, acbus5, acbus6 , acbus8, acbus9 output low i/o mode acbus5, acbus6,acbus8, acbus9 acbus bitbang table 4 . 4 : acbus signal option * a 10k resistor pull up is also recommended . **when in usb suspend m ode , the output clocks are also suspended.
12 ? copyright 2011 future technology devices international ltd document reference no.: ft_000367 UM232H single channel usb hi - speed ft232h development module datasheet version 1.2 clearance no.: ftdi# 198 5 module dimensions figure 5 . 1 : um232 h module dimensions all dimensions are in millimetres . the UM232H module uses exclusively lead fre e components, and are fully compliant with european union directive 2002/95/ec. f t d i 2 0 1 1 g n d 2 . 5 4 1 5 . 2 4 4 4 . 5 4 3 . 0 1 0 . 0 1 8 . 2 5 1 3 . 0 5 . 3 1 4 . 9 1 . 6 4 . 1 5 . 8 5 . 0 d i a m e t e r 0 . 5 0 1 2 . 5 0 1 4 . 8 0 2 . 0 8 . 0
13 ? copyright 2011 future technology devices international ltd document reference no.: ft_000367 UM232H single channel usb hi - speed ft232h development module datasheet version 1.2 clearance no.: ftdi# 198 6 ft232 h device characteristics and ratings 6.1 dc characteristics the i/o signal levels are +3.3 v , and all io pins are +5v tolerant (except the usb phy pins). dc characteristics (a mbient temperature = - 40c to +85c) parameter description minimum typical maximum units conditions vccio* vccio operating supply voltage 2.97 3.63 v cells are 5v tolerant vregin vregin voltage regulator input 3.6 5 5.5 v +5v supply ireg regulator outp ut current 1 0 0 ma +3v3 output i cc 5v0 UM232H c urrent draw n 2 62 ma + 5v supply i cc 3v3 UM232H c urrent draw n 1.2 59 ma +3.3v supply table 6 . 1 : operating voltage and current (except phy) *note: failure to c onnect all vccio pins the device will have unpredictable behaviour. for the electrical characteristics of the ft232h device, please refer to the ft232h datasheet
14 ? copyright 2011 future technology devices international ltd document reference no.: ft_000367 UM232H single channel usb hi - speed ft232h development module datasheet version 1.2 clearance no.: ftdi# 198 7 module configurations the UM232H module can be configur ed as usb bus - p owered or usb self - p owere d. this section describes how to configure the UM232H for a number of different power supply arrangement s . 7.1 bus powered configuration bus powered configuration , w here the +5v supply that powers the module is sourced from the usb bus , and the 3v3 regulator output powers the core of the ft232h. figure 7 . 1 : bus powered configuration figure 7.1 illustrates the UM232H in a typical usb bus powered design configuration , whic h consists of two connections, a j1 - 2 to j1 - 3 connection and a j2 - 2 to j2 - 3 connection . c onnecting j1 - 2 (5v0) to j1 - 3 (usb) takes the power from the vbus pin ( j1 - 3 ) and supplies it to the on chip voltage regulator input of the ft232h via pin 5v0 ( j1 - 2) . connecting j2 - 2 (vio) (p ower input for core of the ft232h ) and j2 - 3 (3v3) ( power output from the ft232h) powers the vccio , vpll and vphy pins of the ft232h chip . a usb bus powered device gets its power from the usb bus. basic rules for usb bus power devi ces are as follows C i) on plug - in to usb, the device must draw no more than 100ma. ii) on usb suspend the device must draw no more than 500a. iii) a bus powered high power usb device (one that draws more than 100ma) should use pwren# to keep the current below 100ma on plug - in and 500a on usb suspend. iv) a device that consumes more t han 100ma cannot be plugged into a usb bus powered hub. v) no device can draw more that 500ma from the usb bus. interfacin g the UM232H module to a microcontroller (mcu), or other logic for a bus powered design would be done in exactly the same way as for s elf - p owered design s (see section 7.3 ), except that the mcu or external logic would take its power supply from the usb bus (either the 5v on the usb pin, or 3.3v on the 3v3 pin). f t d i 2 0 1 1 g n d u s b 5 v 0 3 v 3 v i o j 2 - 1 j 2 - 1 4 j 1 - 1 j 1 - 1 4 m c u t x d t x d r x d r x d r t s # c t s # r t s # c t s # 5 v o r 3 v 3
15 ? copyright 2011 future technology devices international ltd document reference no.: ft_000367 UM232H single channel usb hi - speed ft232h development module datasheet version 1.2 clearance no.: ftdi# 198 7.2 usb bus powered with power switching configur ation figure 7 . 2 : bus powered with power switching configuration usb bus powered circuits need to be able to power down in usb suspend mode in order to meet the <=500a total u sb suspend current requirement (including external logic). some external hardware can 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 ft232h provides a simple but effective way of turning off power to external circuitry during usb suspend. figure 7. 2 shows how to use a discrete p - channel logic level mosfet to control the power to external logic circuits. a suitable device would be an international rectifier ( www.irf.com ) irlml6402, or equivalent. it is recommended that a soft start circuit consisting of a 1k series resistor and a 0.1f capacitor are used to limit the current surge when the mosfet turns on . without the soft start circuit there is a danger that the transient power surge of the mosfet turning on will reset the ft232h, or the usb host / hub controller. the values used here allow attached circuitry to power up with a slew rate of ~12.5v per millisecond, in other words the output voltage will transition from gnd to 5v in approximately 400 microseconds. a 100 k resistor to vbus create s a week pull up on the gate, this can prevent current from flowing through the transistor during a power up or power down of the ft232h . alternatively, a dedicated power switch i.c. with inbuilt soft - start can be used instead o f a mosfet. a suitable power switch i.c. for such an application would be a micrel ( www.micrel.com ) mic2025 - 2bm or equivalent. please note the following points in connection with power controlled designs: i) the logic to be controlled must have its own reset circuitry so that it will automatically reset itself when power is applied on coming out of suspend. ii) set the pull - down on suspend option in the internal eeprom. iii) one of the a cbus p ins should be configured as pwren# in the internal eeprom, and should be used to switch the power supply to the external circuitry. iv) for usb high - power bus powered device (one that consumes greater than 100ma, and up to 500ma of current from the usb bus), the power consumption of the device s hould be set in the max power field in the internal eeprom. a high - power bus powered device must use this descriptor in the internal eeprom to inform the system of its power requirements. v) for 3.3v power controlled circuits the ft232hs vio pin must not be powered down with the external circuitry (the pwren# signal gets its vcc supply from vio). either connect the power switch between the output of the 3.3v regulator and the external 3.3v logic or power vio from the 3v3 pin of the ft232h. f t d i 2 0 1 1 g n d u s b 5 v 0 3 v 3 v i o j 2 - 1 j 2 - 1 4 j 1 - 1 j 1 - 1 4 m c u t x d t x d r x d r x d r t s # c t s # r t s # c t s # s d g p - c h a n n e l p o w e r m o s f e t 1 k 0 . 1 u f 0 . 1 u f s o f t s t a r t c i r c u i t p w r e n # 1 0 0 k
16 ? copyright 2011 future technology devices international ltd document reference no.: ft_000367 UM232H single channel usb hi - speed ft232h development module datasheet version 1.2 clearance no.: ftdi# 198 7.3 self powered conf iguration 7.3.1 self - powered configuration with 3v3 i/o and running on +5v external supply: figure 7 . 3 : self - powered configuration C 5v0 external supply figure 7 . 3 illustrates the um 232 h in a typical usb self - p owered configuration. a n external supply +5.0v is connected to the module s 5v0 pin. j2 - 2 (vio) is also connected to j2 - 3 (3v3) to supply t he vcc io supply from the on board regulator but a separate supply could have been used. a usb self powered device gets its power from its own power supply 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 us e powered down. ii) a self powered device can use as much current as it likes 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 and both bus and self powered usb hub. in this case, the power descriptor in the internal eeprom should be programmed to a value of zero ( s elf - p owered). in order to meet requirement (i) the usb power is used to cont rol the reset# pin of the ft232h device. when the usb host or hub is powered up t he internal 1.5k resistor on usbdp is pulled up to 3.3v, thus identifying the devices as a full speed device to usb. when the usb host or hub power is off, reset# will go low and the device will be held in reset. as reset# is low, the internal 1.5k resis tor will not be pulled up to 3.3v, so no current will be forced down usbdp via the 1.5k pull - up resistor when the host or hub is powered down. to do this j1 - 3 (usb) is connected to pu2 and pu1 is connected to j2 - 4 ( rst# ) . failure to do this may cause som e usb host or hub controllers to power up erratically. note: when the ft232h is in reset, the uart interface pins all go tri - state. these pins have internal 200k pull - up resistors to vccio, so they will gently pull high unless driven by some external log ic. figure 7 . 3 is also an example of interfacing the ft232 h to a microcontroller (mcu) uart interface. this example uses txd and rxd for transmission and reception of data and rts# / cts# hardware handshaking. optionally, ri# can be connected to another i/ o pin on the mcu and could be used to wake up the usb host controller from suspend mode. if the mcu is handling power management functions, then a n a cbus pin can be configured as pwren# and should be connected to an i/o pin of the mcu. f t d i 2 0 1 1 g n d u s b 5 v 0 3 v 3 v i o j 2 - 1 j 2 - 1 4 j 1 - 1 j 1 - 1 4 5 v m c u t x d t x d r x d r x d r t s # c t s # r t s # c t s # 5 v o r 3 v 3 p u 1 r s t # p u 2
17 ? copyright 2011 future technology devices international ltd document reference no.: ft_000367 UM232H single channel usb hi - speed ft232h development module datasheet version 1.2 clearance no.: ftdi# 198 a n a lternative to connecting the pull - up network to the reset pin , to prevent current from flowing back the usb power bus line , is to connect the network acbus7 pin to achieve the same results but with additional benefits. a function called pwrsav# is used to prevent curren t from flowing the usb line in the same way as connecting the reset to the a pull - up network. however, the pwrsav# function has the additional feature of being able to put ft232 h into sleep mode when the usb host is powered down. there is one trade of o us ing reset instead of pwrsav#, in mpsse mode the ac b us 7 pin can be selected as a gpio pin , using this pin from both pwrsav# and gpio mode can cause a conflict. pwrsav# is enabled and disabled using the eeprom, this function is disabled by default. figure 7 . 4 illustrates an alternative usb self - power configuration. figure 7 . 4 : alternative self - powered configuration C 5v0 external suppl y f t d i 2 0 1 1 g n d u s b 5 v 0 3 v 3 v i o j 2 - 1 j 2 - 1 4 j 1 - 1 j 1 - 1 4 5 v m c u t x d t x d r x d r x d r t s # c t s # r t s # c t s # 5 v o r 3 v 3 p u 1 a c b u s 7 p u 2
18 ? copyright 2011 future technology devices international ltd document reference no.: ft_000367 UM232H single channel usb hi - speed ft232h development module datasheet version 1.2 clearance no.: ftdi# 198 self - powered configuration with 3v3 i/o and running on +3.3v external suppl y: figure 7 . 5 : self - powered configuration C 3v3 external supply figure 7. 4 illustrat es the UM232H in a typical usb s elf - p owered configuration similar to figure 7. 3 . the difference here is that the UM232H module is powered from an external 3.3v supply which is connected to the 5v0 (+3v3 power supply input can also be supplied to 5v0 pin ) , vio and 3v3 pin s of the modules . please note that when the UM232H running from +3v3, the 3v3 pin becomes an input. the vio and 3v3 pins connection provides 3v3 to the vccios, vpll and vphy on the ft232h chip. simularly to the usb - powered configuation an alternative configuration which utilised pwrsav# can be implemented . figure 7 . 6 illustrated this configuration. figure 7 . 6 : alternativ e self - powered configuration C 3v3 external supply f t d i 2 0 1 1 g n d u s b 5 v 0 3 v 3 v i o j 2 - 1 j 2 - 1 4 j 1 - 1 j 1 - 1 4 3 v 3 m c u t x d t x d r x d r x d r t s # c t s # r t s # c t s # 5 v o r 3 v 3 3 v 3 p u 1 r s t # p u 2 f t d i 2 0 1 1 g n d u s b 5 v 0 3 v 3 v i o j 2 - 1 j 2 - 1 4 j 1 - 1 j 1 - 1 4 3 v 3 m c u t x d t x d r x d r x d r t s # c t s # r t s # c t s # 5 v o r 3 v 3 3 v 3 p u 1 a c b u s 7 p u 2
19 ? copyright 2011 future technology devices international ltd document reference no.: ft_000367 UM232H single channel usb hi - speed ft232h development module datasheet version 1.2 clearance no.: ftdi# 198 8 UM232H module circuit schematic figure 8 . 1 : module circuit schematic
20 ? copyright 2011 future technology devices international ltd document reference no.: ft_000367 UM232H single channel usb hi - speed ft232h development module datasheet version 1.2 clearance no.: ftdi# 198 9 eeprom configuration the ft232h uses an external eeprom (on the UM232H module). th is eeprom can be programmed over usb using ft_prog . the default settings of the eeprom are shown in the following table: parameter value notes usb vendor id (vid) 0403h ftdi default vid (hex) usb product ud (pid) 6014h ftdi default pid (hex) bcd device 009h serial number enabled? yes serial number see note a unique serial number is generated and programmed into the eeprom during device final test. pull down i/o pins in usb suspend disa bled 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 UM232H max bus power current 9 0ma power source bus powered device type ft232 h usb version 0200 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 hi - speed device (480mb/s). remote wake up enabled taking ri# low will wake up the usb host controller fr om suspend in approximately 20 ms. high current i/os disabled enables the high drive level on the uart and acbus i/o pins. load vcp driver enabled makes the device load the vcp driver interface for the device. acbus0 trist - pu default configuration of ac bus0 C input pulled up acbus1 trist - pu default configuration of acbus1 C input pulled up acbus2 trist - pu default configuration of acbus2 input pulled up acbus3 trist - pu default configuration of acbus3 C input pulled up acbus4 trist - pu default configura tion of acbus4 C input pulled up acbus5 trist - pu default configuration of acbus5 C input pulled up acbus6 trist - pu default configuration of acbus6 C input pulled up acbus7 trist - pu default configuration of acbus7 C input pulled down acbus8 pwrenn def ault configuration of acbus8 C pwr led acbus9 t x&rxled default configuration of acbus9 C tx/rx led table 9 . 1 : default internal eeprom configuration
21 ? copyright 2011 future technology devices international ltd document reference no.: ft_000367 UM232H single channel usb hi - speed ft232h development module datasheet version 1.2 clearance no.: ftdi# 198 10 contact information head office C glasgow, uk future tech nology devices international limited unit 1, 2 seaward place, centurion business park glasgow g 41 1hh united kingdom tel: +44 (0) 141 429 2777 fax: +44 (0) 141 429 2758 e - mail (sales) sales 1 @ftdichip.com e - mail ( support) support 1 @ftdichip.com e - mail (general enquiries) admin1@ftdichip.com web site url http://www.ftdichip.com web shop url http://www.ftdichip.com branch office C taipei, taiwan future technology devices international limited (taiwan) 2f, no. 516, sec. 1, neihu road taipei 114 taiwan , r.o.c. tel: +886 (0) 2 879 1 3570 fax: +886 (0) 2 8 7 9 1 3576 e - mail (sales) tw.sales1@ftdichip.com e - mail (support) tw.support1@ftdichip.com e - mail (general enquiries) t w.admin1@ftdichip.com web site url http://www.ftdichip.com branch office C hillsboro, oregon, usa future technology devices international limited (usa) 7235 nw evergreen parkway, suite 600 hillsboro, or 97123 - 580 3 usa tel: +1 (503) 547 0988 fax: +1 (503) 547 0987 e - mail (sales) us.sales@ftdichip.com e - mail (support) us.support@ftdichip.com e - mail (general enquiries) us. admin@ftdichip.com web site url http://www.ftdichip.com branch office C shanghai , china future technology devices international limited ( china ) room 408 , 317 xianxia road, s hanghai, 200051 china tel: +86 21 62351596 fax: +86 21 62351595 e - mail (sales) cn .sales@ftdichip.com e - mail (support) cn.support@ftdichip.com e - mail (general enqui ries) cn .admin@ftdichip.com web site url http://www.ftdichip.com distributor and sales representatives
22 ? copyright 2011 future technology devices international ltd document reference no.: ft_000367 UM232H single channel usb hi - speed ft232h development module datasheet version 1.2 clearance no.: ftdi# 198 please visit the sales network page of the ftdi web site for the con tact details of our distributor(s) and sales representative(s) in your country. 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 refere nce 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 suppor t and/or safety applications is entirely at the users 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 f reedom 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 mater ial 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
23 ? copyright 2011 future technology devices international ltd document reference no.: ft_000367 UM232H single channel usb hi - speed ft232h development module datasheet version 1.2 clearance no.: ftdi# 198 appendix a C list of tables and figures list of tables table 4.1 : UM232H connector j1 signal description ................................ ................................ . 9 table 4. 2 : UM232H connector j2 signal description ................................ ............................... 10 table 4.3 : acbus signal option ................................ ................................ ................................ ........ 11 table 6.1 : operating voltage and current (exce pt phy) ................................ ........................ 13 table 9.1 : default internal eeprom configuration ................................ ................................ .. 20 list of figures figur e 1.1 : UM232H usb to serial/fifo development module ................................ ............. 1 figure 4.1 : module pin out ................................ ................................ ................................ .................... 7 figure 5.1 : UM232H module dimensions ................................ ................................ ...................... 12 figure 7.1 : bus powered configuration ................................ ................................ ......................... 14 figure 7.2 : bus powered with power switching configuration ................................ ........... 15 figure 7.3 : self - powered configuration C 5v0 external supply ................................ .......... 16 figure 7.4 : self - powered configuration C 5v0 external supply ................................ .......... 17 figure 7.5 : self - powered configuration C 3v3 external supply ................................ .......... 18 figure 7.6 : self - powered configuration C 3v3 external supply ................................ .......... 18 figure 8.1 : module circuit schematic ................................ ................................ ............................. 19
24 ? copyright 2011 future technology devices international ltd document reference no.: ft_000367 UM232H single channel usb hi - speed ft232h development module datasheet version 1.2 clearance no.: ftdi# 198 appendix b C revision history version draft initial datasheet created 31 st january 20 11 version 1.0 initial release 14 th february 2011 version 1.1 additional dimensions ad ded , eeprom default current limit updated 2 1 st march 20 1 1 version 1.2 added and corrected details a bout acbus7 18 th april 2011 updated schematic

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