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rev. 1.00 1 december 09, 2016 rev. 1.00 pb december 09, 2016 HT42B534-X usb to uart bridge ic features ? operating voltage (v dd ): 3.3v~5.5v ? uart pin vol tage (v ddio ): 1.8v~v dd (less than v dd voltage) ? power down and wake-up functi ons to reduc e power consumption ? fully integrated 12mhz osci llator wit h 0.25% accuracy for all usb modes which requires no external components ? usb interface ? usb 2.0 full speed compatible ? implements usb protocol composite device: C communication device class (cdc) for communications and confguration C human interface device (hid) for user confgure usb vid, pid and device description strings ? internal 1.5k pull-high resistor on d+ pin ? fully-duplex universal asynchronous receiver and transmitter interface C uar t ? supports baud rate up to 3mbps ? supports maximum 128 bytes transmit buffer and 128 bytes receive buffer ? uart data formats supported: C data bits: 8 C stop bits: 1 and 2 C parity: odd, even, no parity ? supports rts/cts pins for auto fow control ? supports rx pin resume signal to request a remote wake-up ? supports vddio pin for uar t pins power supply ? supports standard windows ? drivers for virtual com port (vcp): windows xp (sp2), vista, widows 7 & windows 8 (only an inf fle is required), windows 10 ? supports android 4.0 or later version and mac os x ? integrated 256 bytes true eeprom for user memory ? package types: 8-pin sop, 10-pin sop/msop, 16-pin nsop general description the HT42B534-X device is a high performance usb to uart bridge cont roller with fully int egrated usb and uart interface functions, designed for applications that communicate with various types of uart. th e dev ice in cludes a usb 2.0 ful l speed compatible interface which is used for pc communication. the device also includes a fully integrated high speed oscillator which is used as clock source for the usb and uart baud rate generator. the baud rate gen erator ca n support up to 3mbps of baud rate for the uart interface.
rev. 1.00 2 december 09, 2016 HT42B534-X usb bridge ic naming rules ht42b 5 34 -x product family ht42b = holtek bridge ic bridge series of host 5 = usb usb class type version 1 = first version bridge series of device 2 = i 2 c 3 = spi 4 = uart 3 = cdc class 6 = hid class selection table part no. description vdd usb virtual com hid fifo/buffer interface data rate i/o vdd package ht42b532-x usb to i 2 c bridge 3.3v~ 5.5v full-speed tx: 62 bytes rx: 62 bytes up to 400khz 8sop 10msop ht42b533-x usb to spi bridge tx: 128 bytes rx: 128 bytes up to 8mhz 10msop 16nsop HT42B534-X usb to uart bridge tx: 128 bytes rx: 128 bytes up to 3mbps baud 8sop 10sop/msop 16nsop ht42b564-x usb (hid) to uart bridge tx: 32 bytes rx: 32 bytes up to 115.2kbps baud 10sop block diagram 3.3v regulator baud rate generator uart vid pid configure 128b rx buffer usb phy internal oscillator tx rx cts rts d+ d- vdd gnd v33o vddio 128b tx buffer usb controller dtr dsr ri dsd led udet external rs-232 transceiver or uart circuitry device power
rev. 1.00 3 december 09, 2016 HT42B534-X pin assignment gnd vddio d- vdd v33o tx rx d+ 1 2 3 4 8 7 6 5 v33o gnd cts tx vddio rx rts d- d+ vdd HT42B534-X 8 sop-a 10 9 8 7 6 1 2 3 4 5 HT42B534-X 10 msop-a d+ d- v33o gnd cts tx udet led dtr vddio rx dsr rts dcd ri vdd 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 HT42B534-X 16 nsop-a vdd v33o tx led udet vddio rx gnd d- d+ 10 9 8 7 6 1 2 3 4 5 HT42B534-X 10 sop-a package type marking 8sop HT42B534-X 10sop HT42B534-X 10msop b534-x 16nsop HT42B534-X note: x=1 for version number. pin description as the pin description table applies to the package type with the most pins, not all of the listed pins may b e p resent on package types with smaller numbers of pins. pin name type description d+ i/o usb d+ line d- i/o usb d- line tx o asynchronous data output (uart transmit) rx i asynchronous data input (uart receive) cts i clear to send control input, active low rts o ready to send control output, active low dsr i data set ready control input, active low dtr o data terminal ready control output, active low dcd i data carrier detect control input, active low ri i ring indicator control input, active low led o tx/rx signal led indication, active low udet i usb plug in/out detect pin, only for 10-pin sop package v33o o 3.3v regulator output vddio pwr positive power supply for tx/rx/cts/rts/dsr/dtr/dcd/ri pins vdd pwr positive power supply, usb bus power gnd pwr negative power supply, ground
rev. 1.00 4 december 09, 2016 HT42B534-X absolute maximum ratings supply v oltage ........................ v ss ?0.3v to v ss +6.0v input v oltage .......................... v ss ?0.3v to v dd +0.3v storage t emperature ........................... -50?c to 125?c operating t emperature ......................... -40?c to 85?c i oh t otal ............................................................ -80ma i ol t otal ............................................................. 80ma total power dissipation ................................. 500mw note: these are stress ratings only. stresses exceeding the range specifed under absolute maximum ratings may cause substantial damage to this device. functional operation of this device at other conditions beyond those listed in the specifcation is not implied and prolonged exposure to extreme conditions may affect devices reliability. d.c characteristics ta=25c symbol parameter test conditions min. typ. max. unit v dd conditions v dd operating voltage 3.3 5.5 v v ddio uart pins vddio input voltage 1.8 v dd v i dd operating current 5v no load 11 16 ma i sus suspend current (usb) 5v suspend mode, no load, usb on, other peripherals off 360 450 a i stb standby current (non-usb) for 10-pin sop package only 3v standby mode, no load, usb plug-out, other peripherals off, vdd power is from vddio C 0.1 1.0 a v il input pins input low voltage 0 0.2v ddio v v ih input pins input high voltage 0.8v ddio v ddio v i ol i/o pins sink current 3v v ol = 0.1v ddio 4 8 ma 5v 10 20 ma i oh i/o pins source current 3v v oh = 0.9v ddio -2 -4 ma 5v -5 -10 ma r ph i/o pins pull-high resistance 3v 20 60 100 k 5v 10 30 50 k i leak input leakage current 3v v in = v dd or v in = v ss 1 a 5v 1 a v v33o 3.3v regulator output voltage 5v i v33o = 70ma 3.0 3.3 3.6 v r udp1 pull-high resistance between d+ and v33o 3.3v -5% 1.5 +5% k
rev. 1.00 5 december 09, 2016 HT42B534-X a.c characteristics ta=25c symbol parameter test condition min. typ. max. unit v dd condition f hirc high speed internal rc oscillator 3.3v~5.5v usb mode -0.25% 12 +0.25% mhz t sst system start-up timer period rx pin wake-up from power down mode 16 t hirc t rstd system reset delay time power-on reset 25 50 100 ms power-on reset characteristics ta=25c symbol parameter test conditions min. typ. max. unit v dd conditions v por v dd start voltage to ensure power-on reset 100 mv rr por v dd rising rate to ensure power-on reset 0.035 v/ms t por minimum time for v dd stays at v por to ensure power-on reset 1 ms v dd t por rr por v por time
rev. 1.00 6 december 09, 2016 HT42B534-X usb interface the usb interface, being usb 2.0 full-speed compatible, i s a 4 -wire se rial b us t hat a llows communication between a host device and up to 127 max peripheral devices on the same bus. a token based protocol method is used by the host device for communication control. other advantages of the usb bus include live plugging and unplugging and dynamic device c onfiguration. as t he c omplexity of usb data protocol does not permit comprehensive usb operation information to be provided in this datasheet, the reader should therefore consult other external information for a detailed usb understanding. power planes there are two power planes for the device and they are the usb bus power input (vdd) and 3.3v regulator output (v33o). for the usb sie vdd will supply all circuits related to usb sie and be sourced from pin vdd. once the usb is removed from the usb and there is no power in the usb bus, the usb sie circuit is no longer operational. usb interface operation to communicate with an external usb host, the internal usb module has external pins known as d+ and d- along with the 3.3v regulator output v33o. a serial int erface engine (sie) decodes the incoming usb data stream and transfers it to the correct endpoint buf fer memory know n as the fifo . the usb module has 4 endpoints, ep0 ~ ep3. the endpoint 0 supports the control transfer while the endpoint 1 ~ endpoint 3 support the interrupt or bulk t ransfer. t he ht 42b534-x bri dge ic support s the usb c ommunication de vice c lass ( cdc) f or communications and confguration. endpoint transfer type 0 control 1 interrupt 2 bulk out 3 bulk in usb endpoint transfer type if there is no signal on the usb bus for over 3ms, the usb device will enter the suspend mode. the device enters the suspend state to meet the requirements of the usb suspe nd current spe cification. whe n t he resume signal is asserted by the usb host, the device will be woken up and leave the suspend mode. as t he usb de vice ha s a re mote wa ke-up fu nction, the usb device can wake up the usb host by sending a remote wake-up pulse. once the usb host receives a remote wake-up signal from the usb device, the host will send a resume signal to device. usb vid and pid confguration the de vice ha s c onfigured t he de fault v endor id (vid:0x04d9), product id (pid:0xb534) and product description st rings o f usb t o uar t b ridge. t he user c an upda te t he v endor id, produc t id, produc t description strings and remote wake-up setting using their application program. this device has been configured to the default usb confguration data as shown in the following table. parameter value (hex) usb vendor id (vid) 0x04d9 usb product id (pid) 0xb534 remote wake-up default disable manufacturer name holtek product description usb to uart bridge serial number 0000 uart interface the HT42B534-X contains an integrated full-duplex asynchronous serial communications uar t interface that e nables c ommunication wi th e xternal d evices that contain a serial interface. the uar t function has m any fe atures a nd c an t ransmit a nd re ceive da ta serially by transferring a frame of data with eight data bits pe r transmission as well as being abl e to de tect errors when the data is overwritten or incorrectly framed. t he uar t f unction p ossesses i ts o wn internal interrupt which can be used to indicate when a reception occurs or when a transmission terminates. the integrated uar t function contains the following features: ? full-duplex, asynchronous communication ? 8 bits character length ? even, odd or no parity options ? one or two stop bits ? baud rate generator with prescaler ? 128-byte deep fifo t ransmit data buffer ? 128-byte deep fifo receive data buffer ? rx pin wake-up function ? uart pins power supply by vddio pin
rev. 1.00 7 december 09, 2016 HT42B534-X uart external pin to communicate with an external serial interface, the internal uar t has two external pins known as tx a nd r x. t he t x a nd r x p ins a re t he uar t transmitter and receiver pins respectively. uart data transfer scheme the da ta wi ll be t ransferred t o t he t ransmit shi ft register from where it will be shifted out, lsb frst, onto the tx pin at a rate controlled by the baud rate g enerator. d ata to be received by the u art is accepted on the external rx pin, from where it is shifted in, lsb first, to the receiver shift register at a rate controlled by the baud rate generator . the uar t interface provides a 128 byte deep fifo transmit data buf fer and a 128 byte deep fifo receive data buffer for applications. for data trans fer, the u art function utilis es a non- return-to-zero, more commonly know n as nrz, format. this is composed of one start bit, eight data bits and one or two stop bits. parity is supported by the uar t hardware and can be setup to be even, odd or no parity . for the most common data format, 8 data bits a long wi th n o p arity a nd o ne st op b it, d enoted a s 8, n, 1, is used as the default setting, which is the setting at power-on. the following diagram shows the transmit and receive waveforms for an 8-bit data format. bit 0 8-bit data format bit 1 stop bit next start bit start bit parity bit bit 2 bit 3 bit 4 bit 5 bit 6 bit 7 baud rate generator to setup the speed of the serial data communication, the uar t funct ion c ontains i ts own de dicated ba ud rate generator . the default uar t baud rate is 9600bps and it can be controlled by the application program. the baud rate and miss rate table: baud rate real rate miss rate (%) 2400 2403.846154 0.16 4800 4807.692308 0.16 9600 9603.841537 0.04 19200 19207.68307 0.04 38400 38461.53846 0.16 57600 57692.30769 0.16 115200 115384.6154 0.16 230400 230769.2308 0.16 460800 457142.8571 0.79 1700000 1714285.714 0.84 2300000 2285714.286 0.62 3400000 3428571.429 0.84 uart power down and wake-up if the usb host sends a suspend signal to the HT42B534-X usb device, it will enter the suspend mode. it is recommended to ens ure that the uar t data t ransmission or re ception ha s bee n fi nished before the device enters the suspend mode. the uar t function contains a rece iver rx pin wake- up function. a falling edge on the rx pin will wake up the device from the suspend mode. application program demo holtek usb bridge program holtek provides an application program to setup the HT42B534-X bridge ic for usb to uar t data communication. the applic ation progra m ca rries the name holtek usb bridge program. the application program function contains two blocks, the frst block is for the customer vendor id, product id and product information upgrate, the second block is for the usb to uar t application settings. the usb to uar t setting block can be used to confgure the baud rate, data, stop bits, parity , fow control and data transmit/ receive demo. the main fgure for the program update is as follows:
rev. 1.00 8 december 09, 2016 HT42B534-X program update block on the program update block page, first open the holtek vid/pid bridge ic. if the usb has been plugged into the host pc, a new window will pop up showing usb open success. the user can update the cus tomer v id, pid, manufacturer name, product description, serial number and 256 bytes of user memory as well as set the uar t bridge device hardware fow control and remote wake-up functions. a user memory area, where no special data has been stored, can be used by the user for self-defnition. the foll owing t able shows t he confi guration descriptor length. parameter length usb vendor id(vid) 1 word (hex) usb product id(pid) 1 word (hex) manufacturer name max. support 16 characters product description max. support 32 characters serial number max. support 4 words the main figure of the program update block is as follows: confguration operating steps: ? step1: open the holtek bridge vid/pid device. ? step2: change custom device or go to usb to uart page. ? setp3: input vid/pid and product strings (if the user needs to change custom device). ? step4: hardware fow control and remote wakeup setting. ? step5: import user memory (user optional). ? step6: save or open user memory data (user optional). ? step7: download or upload vid/pid/product strings and the user memory data. usb to uart block the usb to uar t setting block is used to confgure the baud rate, data, stop bits, parity , fow control and data transmit/receive demo. this page can also control the out put r ts a nd dt r t oggle pi ns, ct s, ri, dsr and dcd pins input status. the fgure for the usb to uart is as follows: usb to uart bridge operating steps: ? step1: select usb to uart page. ? step2: check that device is HT42B534-X. ? setp3: select com port number. ? step4: select baud rate. ? step5: select one or two stop bits. ? step6: select parity. ? step7: select fow control function. ? step8: open the selections. ? step9: input the data to be transmitted. ? step10: send data. ? step11: receive data. ? step12: t oggle rts/ dtr pins. ? step13: input cts/ri/dsr/dcd pins status.
rev. 1.00 9 december 09, 2016 HT42B534-X application circuits
rev. 1.00 10 december 09, 2016 HT42B534-X dual power product application circuits vdd gnd v33o d- d+ vddio 1f vbus d- d+ vss 0.1f 10f 47pf 47pf 33 ? 33 ? 0.1f HT42B534-X 10sop usb connector battery 3.3v tx rx udet led v cc 1n5817 5v or 3.3v 3.3v 0.1f v dd 330 ? led tx rx uart v dd mcu application circuit note: 1. design note: 10-sop package only for two power application, the vcc power must be below vdd power. (the vcc power can be from the li-battery). 2. the udet pin can used for detect the usb plug-in for transfer data, detect the usb plug-out for entry energy saving mode.
rev. 1.00 11 december 09, 2016 HT42B534-X package information note that the package information provided here is for consultation purposes only . as this information may be updated at regular intervals users are reminded to consult the holtek website for the latest version of the package/ carton information . additional supplementary information with regard to packaging is liste d below . click on the relevant section to be transferred to the relevant website page. ? package information (include outline dimensions, product t ape and reel specifcations) ? the operation instruction of packing materials ? carton information
rev. 1.00 12 december 09, 2016 HT42B534-X 8-pin sop (150mil) outline dimensions symbol dimensions in inch min. nom. max. a 0.236 bsc b 0.154 bsc c 0.012 0.020 c 0.193 bsc d 0.069 e 0.050 bsc f 0.004 0.010 g 0.016 0.050 h 0.004 0.010 0 8 symbol dimensions in mm min. nom. max. a 6.00 bsc b 3.90 bsc c 0.31 0.51 c 4.90 bsc d 1.75 e 1.27 bsc f 0.10 0.25 g 0.40 1.27 h 0.10 0.25 0 8
rev. 1.00 13 december 09, 2016 HT42B534-X 10-pin sop (150mil) outline dimensions symbol dimensions in inch min. nom. max. a 0.236 bsc b 0.154 bsc c 0.012 0.018 c 0.193 bsc d 0.069 e 0.039 bsc f 0.004 0.010 g 0.016 0.050 h 0.004 0.010 0 8 symbol dimensions in mm min. nom. max. a f 6.00 bsc b 3.90 bsc c 0.30 0.45 c 4.90 bsc d 1.75 e 1.00 bsc f 0.10 0.25 g 0.40 1.27 h 0.10 0.25 0 8
rev. 1.00 14 december 09, 2016 HT42B534-X 10-pin msop outline dimensions symbol dimensions in inch min. nom. max. a 0.043 a1 0.000 0.006 a2 0.030 0.033 0.037 b 0.007 0.013 c 0.003 0.009 d 0.118 bsc e 0.193 bsc e1 0.118 bsc e 0.020 bsc l 0.016 0.024 0.031 l1 0.037 bsc y 0.004 0 8 symbol dimensions in mm min. nom. max. a 1.10 a1 0.00 0.15 a2 0.75 0.85 0.95 b 0.17 0.33 c 0.08 0.23 d 3.00 bsc e 4.90 bsc e1 3.00 bsc e 0.50 bsc l 0.40 0.60 0.80 l1 0.95 bsc y 0.10 0 8
rev. 1.00 15 december 09, 2016 HT42B534-X 16-pin nsop (150mil) outline dimensions symbol dimensions in inch min. nom. max. a 0.236 bsc b 0.154 bsc c 0.012 0.020 c 0.390 bsc d 0.069 e 0.050 bsc f 0.004 0.010 g 0.016 0.050 h 0.004 0.010 0 8 symbol dimensions in mm min. nom. max. a 6.0 bsc b 3.9 bsc c 0.31 0.51 c 9.9 bsc d 1.75 e 1.27 bsc f 0.10 0.25 g 0.40 1.27 h 0.10 0.25 0 8
rev. 1.00 16 december 09, 2016 HT42B534-X copyright ? 2016 by holtek semiconductor inc. the information appearing in this data sheet is believed to be accurate at the time of publication. however, holtek assumes no responsibility arising from the use of the specifcations described. the applications mentioned herein are used solely for the purpose of illustration and holtek makes no warranty or representation that such applications will be suitable without further modification, nor recommends the use of its products for application that may present a risk to human life due to malfunction or otherwise. holtek's products are not authorized for use as critical components in life support devices or systems. holtek reserves the right to alter its products without prior notifcation. for the most up-to-date information, please visit our web site at http://www.holtek.com/en/.

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