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www.sensirion.com version 1 C may 201 4 0 / 4 d ata sheet st s c1 temperature sensor ic ? accurate: 0. 3 c typ. accuracy ? small: dfn package, 2 2 0.7 mm ? easy - to - use: fully calibrated, linearized i 2 c output ? l ow - power : 8.6 w average power consumption ? fast: power - up and measurement within 1 ms benefits of sensirions cmosens ? technology ? high reliability and long - term stability ? sensor system on a single chip ? designed for mass production ? o ptimized for lowest cost ? low signal noise contents of this data sheet 1 temperature sensor specifications ................................ .. 1 2 electrical specifications ................................ .................... 2 4 timing specifications ................................ ........................ 3 5 interface specifications ................................ ..................... 4 6 operation and communication ................................ ......... 4 7 quality ................................ ................................ ............... 7 8 packaging and traceability ................................ ............... 7 9 ordering information ................................ ......................... 7 10 technical drawings ................................ ........................... 8 11 further information ................................ .......................... 10 block d iagram figure 1 functional block diagram of the STSC1 . t s ensor signal c onditioning adc i 2 c i nterface calibration m em . vdd vss sda scl data p rocessing and s ystem c ontrol analog digital product summary the STSC1 is a digital temperature sensor designed especially for applications requiring a highly accurate temperature m easurement. sensirions cmosens ? technology offers a complete sensor system on a single chip, consisting of a bandgap temperature sensor, analog and digital signal processing, a/d converter, calibration data memory, and a digital communication interface s upporting i 2 c fast mode. the ultra - small, 2 2 0.7 mm 3 dfn package enables applications in even the most limited of spaces. the sensor covers a temperature measurement range of C 40 to 125 c. the typical accuracy of the temperature sensor is 0.3c. the operation voltage of 1.8 v and an average power consumpt ion below 8.6w make the STSC1 suitable for mobile or wireless applications running on the tightest power budgets.
www.sensirion.com version 1 C may 201 4 1 / 13 1 t emperature sensor specifications parameter conditions value units accuracy tolerance 1 typ. ? 0.3 c max. see figure 2 c repeatability 2 - 0.1 c resolution 3 - 0.01 c specified range 4 - C 4 0 to + 125 c response time 5 ? 63% <5 to 30 s long - term drift 6 typ. < 0.0 2 c/y table 1 temperature sensor specifications. figure 2 typical and maximal accuracy for temperature sensor in c. 1 for definition of typ. and max. accuracy tolerance, please refer to the document sensirion humidity sensor specification statement. 2 the stated repeatability is 3 times the standard deviation (3) of multiple consecutive measurement values at constant condit ions and is a measure for the noise on the physical sensor output. 3 resolution of a/d converter. 4 specified range refers to the range for which the temperature sensor specification is guaranteed. 5 temperature response time depends on heat conductivity of sensor substrate and design - in of sensor in application. 6 max. value is < 0.04c/y . 0 0.5 1 1.5 2 -40 -20 0 20 40 60 80 100 120 t [ ? c] temperature [ c] maximum accuracy typical accuracy
www.sensirion.com version 1 C may 201 4 2 / 4 2 electrical specifications 2.1 electrical characteristics default conditions of 25 c and 1.8 v supply voltage apply to values in the table below , unless otherwise stated . parameter symbol conditions m in t yp . m ax units comments supply v oltage v dd - 1.62 1.8 1.98 v - power - u p /down l evel v p or static power supply 1.05 1.2 1.35 v - supply current i dd idle state - 0.7 2.2 a - measurement - 385 465 a average current consumption while sensor is measuring 7 average - 4.8 - a average current consumption (continuous operation with one measurement per second) 7 average power consumption - average - 8.6 - w average power consumption (continuous operation with one measurement per second) 7 low level input voltage v il - 0.5 - 0.3 v dd v - high level input voltage v ih 0.7 v dd - v dd (max) + 0.5 v - low level output voltage v ol 3 ma sink current - - 0.2 v dd - - table 2 electrical specification s . 2.2 absolute maximum ratings stress levels beyond those listed in table 3 may cause permanent damage to the device. these are stress ratings only and functional operation of the device at these conditions cannot be guaranteed . exposure to the absolute maximum ratin g conditions for extended periods may affect the reliability of the device . parameter rating supply voltage, v dd - 0.3 to + 2.16 v operating temperature range - 40 to +1 25 c storage temperature range - 40 to + 1 25 c esd hbm 2 kv esd mm 200 v esd cdm 500 v latch up , jesd78 class ii, 125c 100ma table 3 absolute maximum ratings. 7 these values can be reduced by using the low power measurement mode, see separate application note.
www.sensirion.com version 1 C may 201 4 3 / 13 4 timing specifications 4.1 sensor system timings default conditions of 25 c and 1.8 v supply voltage apply to values the table below , unless otherwise sta ted . m ax. va lues are measured at - 30c and 1.98 v supply voltage. parameter symbol conditions min . typ. max . units comments power - up time t pu after hard reset, v dd v p or - 1 8 2 2 3 9 s time between v dd reaching v pu and sensor entering idle state soft reset time t sr after soft reset . - 173 230 s time between ack of soft reset command and sensor entering idle state measurement duration t meas - - 10.8 14.4 ms duration for a temperature measurement 8 table 4 system timing specifications. 4.2 communication timings default conditions of 25 c and 1.8 v supply voltage apply to values in the table below , unless otherwise sta ted. parameter symbol conditions m in . t yp . m ax . units comments scl clock frequency f scl - 0 - 400 k hz - h old time (repeated) start condition t hd;sta after this period, the first clock pulse is generated 0.6 - - s - low period of the scl clock t low - 1.3 - - s - high period of the scl clock t high - 0.6 - - s - s et - up time for a repeated start condition t su;sta - 0.6 - - s - sda h old t ime t hd ; dat - 0 - - - - sda s et - u p t ime t su ; dat - 100 - - ns - scl/sda rise time t r - 20 - 300 ns - scl/sda fall t ime t f - 20 * (v dd /5.5) - 300 ns - sda valid time t vd; dat - - - 0.9 s - s et - up time for stop condition t su;sto - 0.6 - - s - capacitive l oad on b us l ine c b - - - 400 pf - table 5 communication timing specifications. the numbers above are values according to the i 2 c specification . 8 these values can be reduced by using the low power measurement mode, see separate application note.
www.sensirion.com version 1 C may 201 4 4 / 13 figure 3 timing d iagram for digital i nput/ o utput p ads. sda directions are seen from the sensor. bold sda line s are controlled by the sensor, plain sda line s are controlled by the micro - controller. note that sda valid read time is triggered by falling edge of preceding toggle. 5 interface specification s the STSC1 supports i 2 c fast mode (scl clock frequency from 0 to 400 khz) with clock stretching. for detailed information on the i 2 c protocol, refer to nxp i 2 c - bus specification and user manual um10204, rev. 4 , february 13, 20 12 : http://ics.nxp.com/support/documents/interface/pdf/i2c.bu s.specification.pdf the STSC1 comes in a 4 - pin package C see table 6 . pin name comment s 1 vdd supply v oltage 2 scl serial c lock, bidirectional 3 sda serial d ata, bidirectional 4 vss ground table 6 STSC1 pin assignment (top view) . the center pad is internally connected to vss. power - supply pins s upply v oltage (vdd) and g round (vss) must be decoupled with a 10 0 nf capacitor that shall be placed as close to the sensor as possible C see figure 4 . scl is used to synchronize the communication between microcontrolle r and the sensor. the master must keep the clock frequency within 0 to 400 khz as specified in table 5 . the STSC1 may pull down the scl line when clock stretching is enabled. the sda pin is used to transfer data in and out of the sensor. for safe communication, the timing specifications defined in the i 2 c manual must be met. to avoid signal contention, the microcontroller must only drive sda and scl low. external pull - up resistors (e.g. 10 k ) are required to pull the signal high. for dimensioning resistor sizes please take bus capacity requirements into account . it should be noted that pull - up resistors may be included in i/o circuits of microcontrollers. figure 4 typical application circuit, including pull - up resistors r p and decoupling of vdd and vss by a capacitor. for good performance of the STSC1 in the application, it is important to know that the center pad of the STSC1 offers the best thermal contact to the temperature sensor . for more information on design - in, please refer to the document shtxx design guide . for mechanical reasons the center pad should be soldered. electrically, the center pad is internally connected to gnd and may be connected to the gnd net on the pcb or left floating. 6 operation and communication all commands and memory locations of the STSC1 are mapped to a 16 - bit address space which can be accessed via the i 2 c protocol . STSC1 bin . dec . hex . i 2 c a ddress 1001010 74 0x4a table 7 STSC1 i 2 c device address. scl 7 0% 3 0% t low 1/f scl t high t r t f sda 7 0% 3 0% t su;dat t hd;dat data in t r sda 7 0% 3 0% data out t vd ;dat t f 2 1 3 4 STSC1 axy89 sda scl gnd vdd mcu (master) r p r p scl out sda out sda in scl in c = 100nf STSC1 (slave ) STSC1 axy89
www.sensirion.com version 1 C may 201 4 5 / 13 6.1 power - up and communication start upon vdd reaching the power - up voltage level v p or , the STSC1 enters idle state after a duration of t pu . in idle state , the STSC1 is ready to receive commands from the master ( microcontroller ). each transmission sequence begins with start condition (s) and ends with an (optional) stop condition (p) as described in the i2c - bus specification . wh enever the sensor is powered up , but not performing a measurement or communicating, it automatically enters idle state for energy saving . please note that in case vdd is set to 0 v (gnd), e.g. in case of a power off of the STSC1, the scl and sda pads are also pulled to gnd. consequently, the i 2 c bus is blocked while vdd of the STSC1 is set to 0 v. 6.2 measurement commands t he STSC1 provides the possibility to define the sensor behavior during measurement (see table 8 ). clock stretching enabled clock stretching disabled 0x7ca2 0x7866 table 8 measurement commands. 6.3 starting a m easurement a measurement communication sequence consist s of a start condition followed by the i 2 c header with the 7 - bit i 2 c device ad dress and a write bit ( w rite w: 0). the sensor indicates the proper reception of a byte by pulling the sda pin low (ack bit) after the falling edge of the 8th scl clock. then the sen sor is ready to receive a 16 - bit measurement command. again, the STSC1 acknowledges the proper reception of each byte with ack condition. a complete measurement cycle is presented in figure 5 . with the acknowledgement of the measurement command, the STSC1 starts measuring temperature. 6.4 sensor behavior during measurement and clock stretching in general, the sensor does not respond t o any i 2 c activity during measurement, i.e. i 2 c read and write headers are not acknowledged (nack). however, when clock stretching has been enabled by using a corresponding measurement command, the sensor responds to a read header with an ack and subsequen tly pulls down the scl line until the measurement is complete. as soon as the measurement is complete, the sensor starts sending the measurement results. during measurement, the sensor has a current consumption according to table 2 . for best possible repeatability of temperature measurements, it is recommended to avoid any communication on the i 2 c bus while the st s c1 is measuring. for more information, see application n ote shtc1 optimization of repeatibility. 6.5 readout of measurement results after a measurement command has been issued and the sensor has completed the measurement, the master can read the measurement results by sending a start condition followed by an i 2 c read header. the sensor will acknowledge the reception of the read header and send two bytes of temperature data followed by one byte crc checksum. each byte must be acknowledged by the microcontroller with an ack condition for the sensor to continue sendi ng data. if the STSC1 does not receive an ack from the master after any byte of data, it will not continue sending data. the i 2 c master can abort the read transfer with a nack condition after any data byte if it is not interested in subsequent data, e.g. the crc byte, in order to save time. 6.6 soft reset the STSC1 provides a soft reset mechanism that forces the system into a well - defined state without removing the power supply. if the system is in idle state (i.e. if no measurement is in progress) the soft reset command can be sent to STSC1 according to figure 6 . this triggers the sensor to reset all internal state machines and reload calibration data from the memory. command hex. code bin. code software reset 0x805d 1000000001011101 table 9 soft reset command. 6.7 read - out of id register the STSC1 has an id register which contains an STSC1 - specific product code. the read - out of the id register can be used to verify the presence of the sensor and proper communication. the command to read the id register is shown in table 10 . command hex. code bin. code read id register 0xefc8 1110111111001000 table 10 read - out command of id register. it needs to be sent to the STSC1 after an i 2 c write header. after the STSC1 has acknowledged the proper reception of the command, the master can send an i 2 c read header and the STSC1 will submit the 16 - bit id followed by 8 bits of crc. the structure of the id is described in table 11 .
www.sensirion.com version 1 C may 201 4 6 / 13 16 - bit id xxxx'xxxxxx 000111 table 11 structure of the 16 - bit id. bits 15:6 of the id contain unspecified information ( marked as x ), which may vary from sensor to sensor, while bits 5:0 contain the STSC1 - specific product code. 6.8 checksum calculation the 8 - bit crc checksum transmitted after each data word is generated by a crc algorithm with the properties displayed in table 12 . the crc covers the c ontents of the two previously transmitted data bytes. property value name crc - 8 width 8 bits polynomial 0x31 (x 8 + x 5 + x 4 + 1) initialization 0xff reflect input false reflect output false final xor 0x00 examples crc (0x00) = 0xac crc (0xbeef) = 0x92 table 12 STSC1 i 2 c crc properties. 6.9 conversion of signal output measurement data is always transferred as 16 - bit values. these values are already linearized by the STSC1. t emperature values can be calculated with the formula given below. temperature conversion formula (result in c): s t denote s the raw sensor output (as decimal value ) for temperature. 6.10 communication data sequences 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 s ack ack ack p STSC1 measuring 1 1 1 0 0 0 0 0 0 1 1 1 1 1 0 0 1 0 1 0 0 0 1 0 i 2 c address + write measurement command msb measurement command lsb measurement in progress 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 s nack p STSC1 measuring STSC1 in idle state s ack 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 repeated i 2 c address + read while meas. is in prog. (polling) measurement contd measurement completed i 2 c address + read 29 30 31 32 33 34 35 36 37 38 s ack STSC1 measuring, scl line pulled low 1 1 1 0 0 0 0 1 i 2 c address + read while meas. is in progress measurement continued 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 ack ack nack p 0 1 1 0 0 1 0 0 1 0 0 0 1 0 1 1 1 1 0 0 0 1 1 1 temperature msb temperature lsb temperature crc checksum figure 5 communication sequence for starting a measurement and reading measurement results displaying both clock stretching options . the numerical example corresponds to a measurement command with clock stretching enabled . the physical values of the transmitted measurement result is 2 3.7 c. clear blocks are controlled by the microcontroller , grey blocks by the STSC1 . clock stretching disabled clock stretching enabled 16 t 2 s 175 45 t ? ? ? ?
www.sensirion.com version 1 C may 201 4 7 / 13 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 s ack ack ack p 1 1 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 1 1 1 0 1 i 2 c address + write c ommand msb c ommand lsb figure 6 command access communication sequence. the example shows a soft reset command. clear blocks are controlled by the microcontroller , grey blocks by the STSC1 . 7 quali ty 7.1 environmental stability qualification of the STSC1 is performed based on the jedec jesd47 qualification test method. 7.2 material contents the device is fully rohs and weee compliant, e.g. free of pb, cd , and hg. 8 packag ing and traceability STSC1 sensors are provided in a dfn package with an outline of 2 2 0.7 mm 3 and a terminal pitch of 1 mm. dfn stands for d ual f lat n o leads. the sensor chip is made of silicon and is mounted to a lead frame . the latter is made of cu plated with ni/pd/au. chip and lead frame are overmolded by a green epoxy - based mold compound. please note that the side walls of sensor are diced and therefore the se diced lead frame surfaces are not covered with the respective plating . the moisture sensitivity level classification of the STSC1 is msl1, according to ipc/jedec j - std - 020. all STSC1 sensors are laser marked for easy identification and traceability . the marking on the sensor consists of two lines and a pin - 1 indicator. the top line contains the sensor type ( STSC1 ), the bottom line contains a 5 - digit, alphanumeric tracking code. the pin - 1 indicator is located in the top left corner. see figure 7 for illustration . figure 7 laser marking on STSC1 , the top line with the pin - 1 indicator and the sensor type, the bottom line with the 5 - digit alphanumeric tracking code . reels are also labeled and provide additional traceability information. 9 ordering information the STSC1 can be ordered in tape and reel packaging with different sizes. the reels are sealed into antistatic esd bags. a drawing of the packaging tape with sensor orientation is shown in figure 10 . quantity packaging reel diameter orde r number 1000 tape & reel 180 mm (7 inch) 1 - 101118 - 01 10000 tape & reel 330 mm (13 inch) 1 - 101085 - 01 table 13 s t sc 1 ordering options . STSC1 xxxxx
www.sensirion.com version 1 C may 201 4 8 / 13 10 t echnical drawing s 10.1 package outlin e figure 8 package outline drawing of the STSC1 . d imensions are given in m illi m eters . 0.7 1.6 1 0.7 0.2x45 0.35 0.35 2 2
www.sensirion.com version 1 C may 201 4 9 / 13 10.2 metal land pattern figure 9 recomm ended metal land pattern for sts c1 (all dimensions are in mm). recommended solder paste stencil thickness is 100m, pads on pcb are recommended to be non solder mask defined (nsmd). 10.3 tape and reel package figure 10 t echnical drawing of the packaging tape with sensor orientation in tape. header tape is to the right and trailer tape to the left on this drawing . dimensions are given in millimeters.
www.sensirion.com version 1 C may 201 4 10 / 13 11 further information for more in - depth information on the STSC1 and its application please consult the following documents : document name description source shtxx/stsxx assembly of smd packages i nstructions on soldering and processing of sensirion smd devices. www.sensirion.com shtc1 optimization of repeatibility measures for optimization of repeatability of sensor output (also applicable to STSC1). www.sensirion.com shtc1 low power measurement mode description of shtc1 low power measurement mode (also applicable to STSC1). www.sensirion.com table 14 documents containing further information relevant for the STSC1 .
www.sensirion.com version 1 C may 201 4 11 / 13 revision history date version page(s) changes 23. may 2014 1 all initial released version
www.sensirion.com version 1 C may 201 4 12 / 13 important notices warning, personal injury do not use this product as safety or emergency stop devices or in any other application where failure of the product could result in personal injury. do not use this product for applications other than its intended and authorized use. before installing, handling, using or servicing this product, please consult the data sheet and a pplication notes. failure to comply with these instructions could result in death or serious injury. if the buyer shall purchase or use sensirion products for any unintended or unauthorized application, buyer shall defend, indemnify and hold harmless sens irion and its officers, employees, subsidiaries, affiliates and distributors against all claims, costs, damages and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such un intended or unauthorized use, even if sensirion shall be allegedly negligent with respect to the design or the manufacture of the product. esd precautions the inherent design of this component causes it to be sensitive to electrostatic discharge (esd). to prevent esd - induced damage and/or degradation, take customary and statutory esd precautions when handling this product. see application note esd, latchup and emc for more information. warranty sensirion warrants solely to the original purchaser of this product for a period of 12 months (one year) from the date of delivery that this product shall be of the quality, material and workmanship defined in sensirions published specifications of the pr oduct. within such period, if proven to be defective, sensirion shall repair and/or replace this product, in sensirion s discretion, free of charge to the buyer, provided that: ? notice in writing describing the defects shall be given to sensirion within fou rteen (14) days after their appearance; ? such defects shall be found, to sensirions reasonable satisfaction, to have arisen from sensirions faulty design, material, or workmanship; ? the defective product shall be returned to sensirions factory at the bu yers expense; and ? the warranty period for any repaired or replaced product shall be limited to the unexpired portion of the original period. this warranty does not apply to any equipment which has not been installed and used within the specifications reco mmended by sensirion for the intended and proper use of the equipment. except for the warranties expressly set forth herein, sensirion makes no warranties, either express or implied, with respect to the product. any and all warranties, including without li mitation, warranties of merchantability or fitness for a particular purpose, are expressly excluded and declined. sensirion is only liable for defects of this product arising under the conditions of operation provided for in the data sheet and proper use o f the goods. sensirion explicitly disclaims all warranties, express or implied, for any period during which the goods are operated or stored not in accordance with the technical specifications. sensirion does not assume any liability arising out of any app lication or use of any product or circuit and specifically disclaims any and all liability, including without limitation consequential or incidental damages. all operating parameters, including without limitation recommended parameters, must be validated f or each customers applications by customers technical experts. recommended parameters can and do vary in different applications. sensirion reserves the right, without further notice, (i) to change the product specifications and/or the information in this document and (ii) to improve reliability, functions and design of this product. copyright ? 201 4 , by sensirion. cmosens ? is a trademark of sensirion all rights reserved headquarters and subsidiaries sensirion ag laubisruetistr. 50 ch - 8712 staefa zh switzerland phone: +41 44 306 40 00 fax: +41 44 306 40 30 info@sensirion.com www.sensirion.com sensirion inc., usa phone: +1 805 409 4900 info_us@sensirion.com www.sensirion.com sensirion japan co. ltd. phone: +81 3 3444 4940 info@sensirion.co.jp www.sensirion.co.jp sensirion korea co. ltd. phone: +82 31 337 7700~3 info@sensirion.co.kr www.sensirion.co.kr sensirion china co. ltd. phone: +86 755 8252 1501 info@sensirion.com.cn www.sensirion.com .cn sensirion ag (germany) phone: +41 44 927 11 66 info@sensirion.com www.sensirion.com to find your local representative, please visit www.sensirion.com/contact

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