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| sensor solutions /// hpc202_5 HTU20D(f) sensor datasheet 9/2015 page 1 features ? full interchangeability with no calibration required in standard conditions ? instantaneous desaturation after long periods in saturation phase ? compatible with automatized assembly processes, including pb free and reflow processes ? individual marking for compliance to stringent traceability requirements applications ? home appliance ? medical ? printers ? humidifier ? multimedia: smart phone, tablet, HTU20D(f) rh/t sensor ic digital relative humidity sensor with temperature output specifications ? dfn type package ? relative humidity and temperature digital output, i2c interface ? fully calibrated ? lead free sensor, reflow solderable ? low power consumption ? fast response time HTU20D(f), is a new digital humidity sensor with temperature output of meas. setting new standards in terms of size and intelligence, it is embedded in a reflow solderable dual flat no leads (dfn) package with a small 3 x 3 x 0.9 mm foot print. this sensor provides calibrated, linearized signals in digital, i2c format. HTU20D(f) digital humidity sensors are dedicated humidity and temperature plug and play transducers for oem applications where reliable and accurate measurements are needed. direct interface with a micro-controller is made possible with the module for humidity and temperature digital outputs. these low power sensor are designed for high volume and cost sensitive applications with tight space constraints. every sensor is individually calibrated and tested. lot identification is printed on the sensor and an electronic identification code is stored on the chip C which can be read out by command. low battery can be detected and a checksum improves communication reliability. the resolution of these digital humidity sensor can be changed by command (8/12bit up to 12/14bit for rh/t). with meas improvements and miniaturization of this sensor, the performance- to -price ratio has been improved C and eventually, any device should benefit from the cutting edge energy saving operation mode. optional ptfe filter/membrane (f) protects HTU20D digital humidity sensors against dust and water immersion, as well as against contamination by particles. ptfe filter/membrane preserves a high response time. the white ptfe filter/membrane is directly stuck on the sensor housing. this membrane is allowing an ip67 compliant protection.
HTU20D(f) rh/t sensor ic digital relative humidity sensor with temperature output sensor solutions /// hpc202_5 HTU20D(f) sensor datasheet 9/2015 page 2 HTU20D(f) rh/t sensor ic digital relative humidity sensor with temperature output sensor solutions /// hpc202_5 HTU20D(f) sensor datasheet 9/2015 page 3 nomenclature htu2xy(f) htu2xy modules htu2xyf modules performance specs maximum ratings peak conditions : less than 10% of the operating time exposure to absolute maximum rating conditions for extended per iods may affect the sensor reliability ratings symbol value unit storage temperature t stg -40 to 125 c supply voltage (peak) v cc 3.8v v dc humidity operating range rh 0 to 100 %rh temperature operating range t a -40 to +125 c vdd to gnd -0.3 to 3.6v v digital i/o pins (data/sck) to vdd -0.3 to vdd+0.3 v input current on any pin -10 to +10 ma humidity accuracy : x = 0: +/ -5%rh max tolerance @55%rh = 1 : +/ -3% rh max tolerance @55%rh output sensor: y = d/a for digital, i2c protocol = p for pwm interface, analog output with embedded ptfe filter/membrane: htu2xyf HTU20D(f) rh/t sensor ic digital relative humidity sensor with temperature output sensor solutions /// hpc202_5 HTU20D(f) sensor datasheet 9/2015 page 4 electrical and general items (@t = 25c, @vdd = 3v) characteristics symbol min typ max unit voltage supply vdd 1.5 3.0 3.6 v current consumption (1) sleep mode idd 0.02 0.14 a measuring 300 450 500 a power dissipation sleep mode 0.06 0.5 w average 8bit (2) 2.7 w communication digital 2-wire interface, i2c protocol heater vdd=3v 5.5mw/t=+0.5 -1.5c storage -40c/125c (1) conditions: v dd = 3v, sck= 400khz at 25c (2) conditions: v dd = 3v, sck= 400khz, temp<60c, duty cycle <10% sensor performance relative humidity (@t = 25c, @vdd = 3v) characteristics symbol min typ max unit resolution 12 bits 0.04 %rh 8 bits 0.7 %rh humidity operating range rh 0 100 %rh relative humidity accuracy @25c (20%rh to 80%rh) typ 3 %rh max see graph 1 %rh replacement fully interchangeable temperature coefficient (from 0c to 80c) t cc -0.15 %rh/c humidity hysteresis 1 %rh measuring time (1) 12 bits 14 16 ms 11 bits 7 8 ms 10 bits 4 5 ms 8 bits 2 3 ms psrr 10 lsb recovery time after 150 hours of condensation t 10 s long term drift 0.5 %rh/ yr response time (at 63% of signal) from 33 to 75%rh (2) rh 5 10 s (1) typical values are recommended for calculating energy consumption while maximum values shall be applied for calculating waiting times in communication. (2) at 1m/s air flow HTU20D(f) rh/t sensor ic digital relative humidity sensor with temperature output sensor solutions /// hpc202_5 HTU20D(f) sensor datasheet 9/2015 page 5 graph1 : relative humidity error budget conditions at 25c ? HTU20D(f) sensors are specified for optimum accuracy measurements within 5 to 95%rh. ? operation out of this range (< 5% or > 95% rh, including condensation) is however possible. temperature coefficient compensation equation for other temperatures than 25c, the following temperature coefficient compensati on equation can be used and will guarantee relative humidity accuracy given in table1, from 0c to 80c: ) ( t f rh rh actualt dt compensate ? ? rhactualt ambient humidity in %rh, computed from htu21d(f) sensor tactual humidity cell temperature in c, computed from htu21d(f) sensor )( t f rh correction (in %rh) is a linear function of the temperature t (c) as describe d below : ) 25 (* 15 .0 ) ( t t f ? ? ? 0 1 2 3 4 5 6 7 8 9 10 0 10 20 30 40 50 60 70 80 90 100 delta relative humidity (%rh) relative humidity (%rh) maximal tolerance HTU20D(f) rh/t sensor ic digital relative humidity sensor with temperature output sensor solutions /// hpc202_5 HTU20D(f) sensor datasheet 9/2015 page 6 temperature characteristics symbol min typ max unit resolution 14 bit 0.01 c 12 bit 0.04 c temperature operating range t - 40 +125 c temperature accuracy @25c typ 0.3 c max see graph 2 c replacement fully interchangeable measuring time (1) 14 bit 44 50 ms 13 bit 22 25 ms 12 bit 11 13 ms 11 bit 6 7 ms pssr 25 lsb long term drift 0.04 c/yr response time (at 63% of signal) from 15c to 45c (2) t 10 s (1) typical values are recommended for calculating energy consumption while maximum values shall be applied for calculating waiting times in communication. (2) at 1m/s air flow graph 2 : temperature error budget 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 -40 -20 0 20 40 60 80 100 120 delta temperature ( c) temperature ( c) maximal tolerance typical tolerance HTU20D(f) rh/t sensor ic digital relative humidity sensor with temperature output sensor solutions /// hpc202_5 HTU20D(f) sensor datasheet 9/2015 page 7 user guide HTU20D(f) application information ? soldering instructions: lead free reflow soldering recommended process for sol de ri ng HTU20D(f) sensor standard re fl ow sol de ri ng ov ens may be used. HTU20D(f) sensor as a humidity sensitive component (as classified by ipc/jede c j-std-020 or equivalent documented procedure with peak temperature at 260c during up to 30 seconds for pb-free asse mbly in ir/convection reflow ovens) must be handled in a manner consistent with ipc/jedec j-std-033 or an equivalent documented procedure. ipc-1601 provides humidity control, handling and packing of pcbs. the h t u 2 0 d ( f ) s en sor is qualifi ed to w it hstand one lead free reflow soldering recommended process profil e below according to jedec standard. mount parts within 24 hours after printing solder paste to avoid potential dry up. for manual soldering, contact time must be limited to 5 seconds at up to 350c. for the design of the HTU20D(f) sensor footprint, it is recommended to use dimensions acc ording to figure below. recommended footprint for HTU20D(f) sensors. values in mm. HTU20D(f) rh/t sensor ic digital relative humidity sensor with temperature output sensor solutions /// hpc202_5 HTU20D(f) sensor datasheet 9/2015 page 8 no specific conditioning of devices is necessary after soldering process, eith er manual or reflow soldering. optimized performance in case of metrological measurements can be reached with stabi lization of devices (24 hours at 25c / 55%rh). similar process is advised after exposure of the devices to extreme relative humidity conditions. in no case, neither after manual nor reflow soldering, a board wash shall be appl ied. therefore, it is strongly recommended to use a no - clean solder paste. in case of ap plications with exposure of the sensor to corrosive gases or condensed water (i.e. environments with high relative humidity) the so ldering pads shall be sealed (e.g. conformal coating) to prevent loose contacts or short cuts. ? storage conditions and handling instructions it is recommended to store HTU20D(f) sensor in its original packaging at following con ditions: temperature shall be in the range of -40c C 125c. ? temperature effects relative humidity reading strongly depends on temperature. therefore, it is essen tial to keep humidity sensors at the same temperature as the air of which the relative h umidity is to be measured. in case of testing or qualification the reference sensor and test sensor must show equal temperature to allow for comparing humidity readings. the HTU20D(f) sensor should be mounted in a way that prevents heat transfer from electronic sensor or that keeps it as low as possible. advice can be ventilati on, reduction of copper layers between the HTU20D(f) sensor and the rest of the pcb or milli ng a slit into the pcb around the sensor (1mm minimum width). example of HTU20D(f) sensor mounting with slits mills to minimize heat transfer ? materials u sed for s ea li ng / m oun ti ng for sealing and gluing (use sparingly), use high filled epoxy for electron ic packaging and silicone. for any specific material please request to humidity.application@te.com . window must remain uncovered. ? wiring considerations and signal int eg rity carrying the sck and data signal parallel and in close proximity (e.g. in wires) for more than 10 cm may result in cross talk and loss of communication. this may be resolved by routing vdd and/or gnd between the two data signals and/or using shielded cables. furthermore, slowing down sck frequency will possibly improve signal integrity. power supply pins (vdd, gnd) must be bypassed with a 100nf capacitor if w ires are used. capacitor should be placed as close as possible to the sensor. HTU20D(f) rh/t sensor ic digital relative humidity sensor with temperature output sensor solutions /// hpc202_5 HTU20D(f) sensor datasheet 9/2015 page 9 ? es d (el ec tr os tatic discharge) esd immunity is qualified according to: ? jedec jesd22-a114 method (human body model at 4kv) for pads & open window ? jedec jesd22-a115 method (machine model 200v) ? esda esd-stm5.3.1-1999 and aec-q100-011 (charged device model, 750 v corner pins, 500v other pins) latch-up immunity is provided at a force current of 100ma with tamb=25c accordi ng to jedec jesd78. for exposure beyond named limits the sensor need additional protection circuit. interface specification typical application circuit, including pull-up resistor rp and decoupling of vdd and gnd by a capacitor. ? power pins (vdd, gnd) the s upp ly vo lt age of HTU20D(f) sensors must be in t he range of 1.5vdc - 3.6vdc. reco mm ended s upp ly vo lt age is 3vdc (regulated). however the typical application circuit includes a pull-up resistor r on data wire an d a 100nf decoupling capacitor between vdd and gnd, placed as close as possible to the sensor. n function comment 1 data data bit-stream 2 gnd ground 3 nc must be left unconnected 4 nc must be left unconnected 5 vdd supply voltage 6 sck selector for rh or temp pad ground or unconnected HTU20D(f) rh/t sensor ic digital relative humidity sensor with temperature output sensor solutions /// hpc202_5 HTU20D(f) sensor datasheet 9/2015 page 10 ? seri al clock i nput (sck) sck is us ed t o sy nchr on ize the co mm un ica ti on between mi croc on tro ll er and HTU20D(f) sensor. since t he interface c on sists of fu ll y sta ti c l og ic t he re is no min im um sc k frequen cy . ? seri al da ta ( da ta) the data pin is used to transfer data in and out of the device. for sending a command to the HTU20D(f) sensor, data is valid on the rising edge of sck and must remain stable while sck is high. after the falling edge of sck, the data value may be changed. for safe communication data shall be vali d t su and t hd before the rising and after the falling edge of sck, respectively. for reading data from the HTU20D(f) sens or, data is valid t vd after sck has gone low and remains valid until the next falling edge of sck. an external pull- up resistor (e.g. 10k) on sck is required to pull the signal high only f or open collector or open drain technology microcontrollers. in most of the cases, pull-up resistors are internally included in i/o circuits of microcontrollers. electrical characteristics ? input/output dc characteristics (vdd=3v, temperature=25c unless otherwise noted) characteristics symbol min typ max unit low level output voltage vdd=3v -4ma HTU20D(f) rh/t sensor ic digital relative humidity sensor with temperature output sensor solutions /// hpc202_5 HTU20D(f) sensor datasheet 9/2015 page 12 ? hold/no hold master modes there are two different operation modes to communicate with the HTU20D(f) sensor: hold mas ter mode and no hold master mode. in the first case, the sck line is blocked (controlled by HTU20D(f) sensor) du ring measurement process while in the second case the sck line remain open for other communication while the sensor is processing the measurement. no hold master mode allows for processing other i2c communication tasks on a bus while the HTU20D(f) sensor is measuring. a communication sequence of the two modes is available below. in the hold master mode, the HTU20D(f) pulls down the sck line while measuring to force the master into a wait state. by releasing the sck line, the HTU20D(f) sensor indicates that internal processing is completed and that transmission may be continued. in the no hold master mode, the mcu has to poll for the termination of the internal process ing of the HTU20D(f) sensor. this is done by sending a start condition followed by the i2c header (1 for read access : 0x81) as shown below. if the internal processing is finished, the HTU20D(f) sensor acknowledges the poll of the mcu and data can be read by the mcu. if the measurement processing is not finished, the HTU20D(f) sensor answers no ack bit and start condition must be issued once more. for both modes, since the maximum resolution of the measurement is 14 bits, the two last least significant bits (lsbs, bits 43 and 44) are used for transmitting status information. bit 1 of th e two lsbs indicates the measurement type (0: temperature, 1: humidity). bit 0 is currently not assigned. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 s 1 0 0 0 0 0 0 0 ack 1 1 1 0 0 1 0 1 ack i2c address + write command (see table p.9) 19 20 21 22 23 24 25 26 27 s 1 0 0 0 0 0 0 1 ack measurement i2c address + read hold during measurement 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 0 1 1 1 1 1 0 0 ack 1 0 0 0 0 0 1 0 ack data (msb) data (lsb) status 46 47 48 49 50 51 52 53 54 1 0 0 1 0 1 1 1 nack p checksum hold master communication sequence command code comment trigger temperature measurement 0xe3 hold master trigger humidity measurement 0xe5 hold master trigger temperature measurement 0xf3 no hold master trigger humidity measurement 0xf5 no hold master write user register 0xe6 read user register 0xe7 soft reset 0xfe HTU20D(f) rh/t sensor ic digital relative humidity sensor with temperature output sensor solutions /// hpc202_5 HTU20D(f) sensor datasheet 9/2015 page 13 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 s 1 0 0 0 0 0 0 0 ack 1 1 1 1 0 1 0 1 ack i2c address + write command (see table p.9) 19 20 21 22 23 24 25 26 27 measurement s 1 0 0 0 0 0 0 1 nack measuring i2c address + read 19 20 21 22 23 24 25 26 27 measurement s 1 0 0 0 0 0 0 1 ack continue measuring i2c address + read 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 0 1 1 1 1 1 0 0 ack 1 0 0 0 0 0 1 0 ack data (msb) data (lsb) status 46 47 48 49 50 51 52 53 54 1 0 0 1 0 1 1 1 nack p checksum no hold master communication sequence grey blocks are controlled by HTU20D(f) sensor. for hold master sequence, bit 45 may be changed to nack followed by a stop conditi on to omit checksum transmission. for no hold master sequence, if measurement is not completed upon read command, sensor does not provide ack on bit 27 (more of these iterations are possible). if bit 45 is changed to nack f ollowed by stop condition, checksum transmission is omitted. in those examples, the HTU20D(f) sensor output is s rh = 0111110010000000 (0x7c80). for the calculation of physical values status bits must be set to 0. refer to conversion of signal outputs sec tion p.16. the maximum duration for measurement depends on the type of measurement and resol ution chosen. maximum values shall be chosen for the communication planning of the mcu. refer to the tab le p.4 and p.6 regarding measuring time specifications. i2c communication allows for repeated start conditions without closing prior sequence with stop condition. ? so ft reset this command is used for rebooting the HTU20D(f) sensor switching the power off and on again. upon reception of this command, the HTU20D(f) sensor system reinitializes and starts operation according to the default settings with the exception of the heater bit in the user register. the soft reset takes less than 15ms. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 s 1 0 0 0 0 0 0 0 ack 1 1 1 1 1 1 1 0 ack p i2c address + write soft reset command grey blocks are controlled by HTU20D(f) sensor. HTU20D(f) rh/t sensor ic digital relative humidity sensor with temperature output sensor solutions /// hpc202_5 HTU20D(f) sensor datasheet 9/2015 page 14 ? user register the content of user register is described in the table below. reserved bits must not be changed and default values of respective reserved bits may change over time without prior notice. therefore, for an y writing to user register, default values of reserved bits must be read first. the end of battery alert/status is activated when the battery power falls below 2.25v. the heater is intended to be used for functionality diagnosis: relative humidi ty drops upon rising temperature. the heater consumes about 5.5mw and provides a temperature increase of about 0.5-1.5c. otp reload is a safety feature and load the entire otp settings to the register, with the exc eption of the heater bit, before every measurement. this feature is disabled per default and it is not recommende d for use. please use soft reset instead as it contains otp reload. bit #bits description/coding default 7,0 2 measurement resolution bit 7 bit 0 rh temp 0 0 12 bits 14 bits 0 1 8 bits 12 bits 1 0 10 bits 13 bits 1 1 11 bits 11 bits 00 6 1 status: end of battery (1) 0: vdd>2.25v 1: vdd<2.25v 0 3, 4, 5 3 reserved 0 2 1 enable on-chip heater 0 1 1 disable otp reload 1 (1) this status bit is updated after each measurement cut-off value for end of battery signal may vary by 0.1v. reserved bits must not be changed. otp reload active loads default settings after each time a measurement command is issued. ? i2c communication reading and writing the user register example in this example, the resolution is set to 8 bits / 12 bits (for rh/temp) from default configuration. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 s 1 0 0 0 0 0 0 0 ack 1 1 1 0 0 1 1 1 ack i2c address + write read register command 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 s 1 0 0 0 0 0 0 1 ack 0 0 0 0 0 0 1 0 nack i2c address + read register content 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 s 1 0 0 0 0 0 0 0 ack 1 1 1 0 0 1 1 0 ack i2c address + write write register command 55 56 57 58 59 60 61 62 63 0 0 0 0 0 0 1 1 ack p register content to be written grey blocks are controlled by HTU20D(f) sensor. HTU20D(f) rh/t sensor ic digital relative humidity sensor with temperature output sensor solutions /// hpc202_5 HTU20D(f) sensor datasheet 9/2015 page 15 ? crc checksum HTU20D(f) sensor provides a crc-8 checksum for error detection. the polynomial used is x 8 + x 5 + x 4 + 1. basic considerations crc stands for cyclic redundancy check. it is one of the most effective error detection schemes and requires a minimal amount of resources. the types of errors that are detectable with crc that is implemented in HTU20D(f) sensors are: ? any odd number of errors anywhere within the data transmission ? all double-bit errors anywhere within the transmission ? any cluster of errors that can be contained within an 8-bit window (1-8 bits incorrect) ? most larger clusters of errors a crc is an error-detecting code commonly used in digital networks and storage devi ces to detect accidental changes to raw data. blocks of data entering these systems get a short check value attached, based on the remainder of a polynomial division of their contents; on retrieval the calculation is repeated, and c orrective action can be taken against presumed data corruption if the check values do not match. crcs are so called because the check (data verification) value is a redundancy (it expands the message without adding information) and the algorithm is based on cyclic codes. crcs are popular becau se they are simple to implement in binary hardware, easy to analyze mathematically, and particularly good at detecting common error s caused by noise in transmission channels. because the check value has a fi xed length, the function that generates it is occasionally used as a hash function. crc for HTU20D(f) sensors using i2c protocol when HTU20D(f) sensors are run by communicating with the standard i2c protocol, an 8 -bit crc can be used to detect transmission errors. the crc covers all read data transmitted by the se nsor. crc properties for HTU20D(f) sensors communicating with i2c protocol are listed in the table below. crc with i2c protocol generator polynomial x 8 + x 5 + x 4 + 1 initialization 0x00 protected data read data final operation none crc calculation to compute an n-bit binary crc, line the bits representing the input in a row, and position the (n+1)-bit pattern representing the crc's divisor (called a "polynomial") underneath the left-hand end of the row. this is first padded with zeroes corresponding to the bit length n of the crc. if the input bit above the leftmost divisor bit is 0, do nothing. if the input bit above the leftmost divisor bit is 1, the divisor is xored into the input (in other words, the input bit above each 1-bit in th e divisor is toggled). the divisor is then shifted one bit to the right, and the process is repeated until the divisor reaches the right-hand end of the input row. HTU20D(f) rh/t sensor ic digital relative humidity sensor with temperature output sensor solutions /// hpc202_5 HTU20D(f) sensor datasheet 9/2015 page 16 since the left most divisor bit zeroed every input bit it touched, when thi s process ends the only bits in the input row that can be nonzero are the n bits at the right-hand end of the row. these n bits are the remainder of the division step, and will also be the value of the crc function. the validity of a received message can easily be verified by perf orming the above calculation again, this time with the check value added instead of zeroes. the remainder should equal zero if there are no detectabl e errors. crc examples the input message 11011100 (0xdc) will have as result 01111001 (0x79). the input message 01101000 00111010 (0x683a: 24.7c) will have as result 01111100 (0x7c). the input message 01001110 10000101 (0x4e85: 32.3%rh) will have as result 01101011 (0x6b). conversion of signal outputs default resolution is set to 12-bit relative humidity and 14-bit temperature readings . measured data are transferred in two byte packages, i.e. in frames of 8-bit length where the most significant bit (msb) is transferred first (left aligned). each byte is followed by an acknowledge bit. the two status bits, the last bits of lsb, must be set to 0 before calculating physical values. to accommodate/adapt any process variation (nominal capacitance value of the humidi ty die), tolerances of the sensor above 100%rh and below 0%rh must be considered. as a consequence: ? 118%rh corresponds to 0xff which is the maximum rh digital output that can b e sent out from the asic. rh output can reach 118%rh and above this value, there will have a clamp of the rh output to this value. ? -6%rh corresponds to 0x00 which is the minimum rh digital output that can be sen t out from the asic. rh output can reac h -6%rh and below this value, there will have a clamp of the rh output to this value. ? relative humidity conversion with the relative humidity signal output s rh , the relative humidity is obtained by the following formula (result in %rh), no matter which resolution is chosen: 16 2 125 6 rh s rh ? ? ?? in the example given p.10, the transferred 16-bit relative humidity data is 0x 7c80: 31872. the relative humidity results to be 54.8%rh. ? temperature conversion the temperature t is calculated by inserting temperature signal output s temp into the following formula (result in c), no matter which resolution is chosen: 16 2 72 . 175 85 . 46 temp s temp ? ? ? ? HTU20D(f) rh/t sensor ic digital relative humidity sensor with temperature output sensor solutions /// hpc202_5 HTU20D(f) sensor datasheet 9/2015 page 17 application: dew point temperature measurement the dew point is the temperature at which the water vapor in the air becomes saturated and condensa tion begins. the dew point is associated with relative humidity. a high relative humi dity indicates that the dew point is closer to the current air temperature. relative humidity of 100% indicates that the dew point is equal to the current temperature (and the air is maximally saturated with water). when the dew point sta ys constant and temperature increases, relative humidity will decrease. dew point temperature of the air is calculated using ambient relative humidit y a nd temperature measurements from HTU20D(f) sensor with following formulas given below: partial pressure (pp tamb ) formula from ambient temperature: dew point temperature (t d ) formula from partial pressure (pp tamb ): pp tamb partial pressure in mmhg at ambient temperature (t amb ) rh amb ambient humidity in %rh, computed from HTU20D(f) sensor t amb humidity cell temperature in c, computed from HTU20D(f) sensor t d calculated dew point in c a, b, c constants: a=8.1332; b=1762.39; c=235.66 ? ? ? ?? ? ? ? ? ?? ? ? ? ?? ? ?? ? ? ?? c a pp rh b t tamb amb d 100 log 10 ?? ? ?? ? ? ? ? ) ( 10 c tamb b a tamb pp HTU20D(f) rh/t sensor ic digital relative humidity sensor with temperature output sensor solutions /// hpc202_5 HTU20D(f) sensor datasheet 9/2015 page 18 package outline ? HTU20D sensor dimensions HTU20D(f) rh/t sensor ic digital relative humidity sensor with temperature output sensor solutions /// hpc202_5 HTU20D(f) sensor datasheet 9/2015 page 19 ? HTU20Df sensor dimensions dimensions are given in mm, tolerances are 0.1mm. the die pad (thermal center pad) is internally con nected to gnd. ? packaging type HTU20D(f) sensors are provided in dfn packaging. dfn stands for dual flat no leads. the HTU20D(f) sensor chip is mounted to a lead frame made of cu and plated with ni/pd/au . chip and lead frame are over molded by green epoxy-based mold compound. please note that side walls of sensors are diced and hence lead frame at diced edge is not covered with respective protective coating. the total weight of the sensor is 0.025g. HTU20D(f) rh/t sensor ic digital relative humidity sensor with temperature output sensor solutions /// hpc202_5 HTU20D(f) sensor datasheet 9/2015 page 20 ? traceability information all HTU20D(f) sensors are laser marked with an alphanumeric, five-digit code on the sensor as pictured bel ow. the marking of the HTU20D(f) sensor consists of two lines with five digits each : ? the first line denotes the sensor type: htu20. ? the second line denotes several information as: o the first digit of the second line defines the output mode: ? d = digital and i2c ? p = pwm o the second digit defines the manufacturing year: 3 = 2013, 4 = 2014, etc. o the last three digits represent an alphanumeric tracking code. that code represents the day of the year. laser marking on HTU20D(f) sensor reels are also labeled, as displayed below and give additional traceability informati on. HTU20D(f) rh/t sensor ic digital relative humidity sensor with temperature output sensor solutions /// hpc202_5 HTU20D(f) sensor datasheet 9/2015 page 21 with: xx: sensor type (20) o: output mode (d = digital, p = pwm) (f): sensor with ptfe membrane ttttttttt: meas traceability code yy: last two digits of the year ddd: day of the year qqqq: quantity per reel (5000 units) ? tape and reel packaging HTU20D(f) sensors are shipped in tape & reel packaging, sealed into antistatic esd bags. standard packaging size is 5000 units per reel. each reel contains 440mm (55 pockets) header tape and 200mm (25 pockets) trailer tape. the drawing of the packaging tapes with sensor orientation is shown in the picture below. ? packaging reels for 5000 unit s: outside diameter of 13 (330mm) and a 1/2 (13mm) diameter arbor hole. ? handling / storage recommendations in order to use and preserve the high quality performance of the htu21 humidity and tempe rature sensor, the following recommendations have to be followed concerning storage and packaging. please read the paragraph below carefully and note that all precautions are appli cable for design phases, production phases as well as in case of returned material to measurement specialties. when sensors are not used or assembled, we recommend to store them in their original sealed anti esd packaging. if sensors have been removed from their original packaging, we recommend to keep them into a nti static shielded esd bags. user direction of unreeling HTU20D(f) rh/t sensor ic digital relative humidity sensor with temperature output sensor solutions /// hpc202_5 HTU20D(f) sensor datasheet 9/2015 page 22 such smd type sensors that are sensitive to moisture are classified msl level 2 according to ipc/je dec j-std- 020.1 for storage, packaging and handling. the shelf life is thus 1 year in following conditi ons of temperature and relative humidity 30c 60%rh. protection against esd mandatory msl level 2 classification ordering information ** HTU20D C i.c 20d rh/t digital ** package: tape and reel m.p.q of 400 pieces, 1500 pieces or 5000 piece s ? hpp845e034r4 C i.c 20d rh/t digital in tape and reel of 400 pieces ? hpp845e034r1 C i.c 20d rh/t digital in tape and reel of 1500 pieces ? hpp845e034r5 C i.c 20d rh/t digital in tape and reel of 5000 pieces ** HTU20Df C i.c 20df rh/t digital with ptfe membrane ** package: tape and reel m.p.q of 5000 pieces ? hpp845e134r5 - i.c 20df rh/t digital in tape and reel of 5000 pieces ** i.c 21d demokit C hpp845kit ** this is a usb device for meas model HTU20D digital relative humidity & temperatu re sensor demonstration. supporting up to 4 sensor acquisitions at the same time, it shows the consi stency of different sensors and test sensor functions conveniently. for detailed information, please request to humidity.application@te.com . HTU20D(f) rh/t sensor ic digital relative humidity sensor with temperature output sensor solutions /// hpc202_5 HTU20D(f) sensor datasheet 9/2015 page 23 revision comments who date 0 document creation d. le gall november 12 1 general update d. le gall-zirilli july 13 2 correction of i2c communication reading and writing, correction of soldering peak temperature, correction of demokit designation m.robert october 13 3 obsolescence of htu2xs (sdm interface) version update of external package dimensions m.robert january 14 4 part number and designation modification m.robert april 14 5 general update m.robert october 14 te.com/sensorsolutions measurement specialties, inc., a te connectivity company. measurement specialties, te connectivity, te connectivity (logo) and e very connection counts are trademarks. all other logos, products and/ or company names referred to herein might be trademarks of their respective owners. the information given herein, including drawings, illustrations an d schematics which are intended for illustration purposes only, is believe d to be reliable. however, te connectivity makes no warranties as to its accuracy or completeness and disclaims a ny liability in connection with its use. te connectivitys obligation s shall only be as set forth in te connectivitys standard terms and conditions of sale for this product and in no case will t e connectivity be liable for any incidental, indirect or consequ ential damages arising out of the sale, resale, use or misuse of the product. users of te connectivity products should make their own evaluat ion to determine the suitability of each such product for the specific ap plication. ? 2015 te connectivity ltd. family of companies all rights reserved. europe measurement specialties, inc - meas france impasse jeanne benozzi cs 83 163 31027 toulouse cedex 3 france tel:+33 (0)5820.822.02 fax:+33 (0)5.820.821.51 sales: humidity.sales@meas-spec.com |
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