hca-baro series miniature amplified barometric pressure sensors 1/6 e / 11641 / a www.sensortechnics.com features 600...1100 mbar, 800...1100 mbar barometric ranges output: 0.25...4.25 v and i 2 c-bus (spi and switching outputs optional) precision asic conditioning calibrated and temperature compensated miniature smt or sil housing rohs compliant sensortechnics pro services electrical connection +vs vou t sc l sd a gnd 1 3 5 8 2 specifications maximum ratings supply voltage v s 4.5 v ... 5.5 v dc (optional 2.7 ... 3.3 v dc ) output current sink 1 ma source 1 ma proof pressure 3 3000 mbara burst pressure 4 5000 mbara lead specifications average preheating temperature gradient 2.5 k/s soak time ca. 3 min time above 217c 50 s time above 230c 40 s time above 250c 15 s peak temperature 260c cooling temperature gradient -3.5 k/s temperature ranges compensated 0 ... +85c operating -25 ... +85c storage -40 ... +125c humidity limits (non-condensing) 0 ... 95 %rh note: pins 5 and 8 (connections for digital i 2 c-bus) are only available for smd package (hca...h)
hca-baro series miniature amplified barometric pressure sensors 2/6 e / 11641 / a www.sensortechnics.com specification notes: 1. total accuracy is the combined error from offset and span calibration, linearity, pressure hysteresis, and temperature effects. linearity is the measured deviation based on a straight line. hysteresis is the maximum output difference at any point within the operating pressure range for increasing and decreasing pressure. calibration errors include the deviation of offset and full scale from nominal values. 2. full scale span (fss) is the algebraic difference between the output signal for the highest and lowest specified pressure. 3. proof pressure is the maximum pressure which may be applied without causing durable shifts of the electrical parameters of the sensing element. 4. burst pressure is the maximum pressure which may be applied without causing damage to the sensing element or leaks to the housing. 5. max. delay time between pressure change at the pressure die and signal change at the output. 6. the response time depends on the adjusted internal a/d resolution of the sensor. for 15 bit it is typ. 2 ms. other a/d resolutions and reponse times are available on request. please contact sensortechnics for further information. 7. sensors with lower current consumption are available on request. please contact sensortechnics for further information. performance characteristics (v s = 5.0 v, t a = 25 c, analog output signal is ratiometric to v s , digital output signal is not ratiometric to v s , pressure applied to high pressure port) s c i t s i r e t c a r a h c. n i m. p y t. x a mt i n u e g n a r e r u s s e r p g n i t a r e p o. . . r a 1 1 6 0 a c h0 0 60 0 1 1 a r a b m . . . r a 1 1 8 0 a c h0 0 80 0 1 1 ) c 5 8 . . . 0 ( y c a r u c c a l a t o t 1 0 . 1 s s f % y a l e d e s n o p s e r 6 , 5 2s m n o i t u l o s e r d / a 6 5 1 t i b n o i t u l o s e r a / d 1 1 ) d a o l o n ( n o i t p m u s n o c t n e r r u c 7 5a m s c i t s i r e t c a r a h c e c n a m r o f r e p l a t i g i d e r u s s e r p . n i m t a t u p t u o 6 6 6 0 x e h t n u o c ) s s f ( n a p s e l a c s l l u f 2 6 6 6 6 s c i t s i r e t c a r a h c e c n a m r o f r e p e u g o l a n a e r u s s e r p . n i m t a t u p t u o 5 2 . 0 v ) s s f ( n a p s e l a c s l l u f 2 0 0 . 4
hca-baro series miniature amplified barometric pressure sensors 3/6 e / 11641 / a www.sensortechnics.com i2c bus introduction the hca-baro is capable to generate a digital output signal. the device runs a cyclic program, which will store a corrected pressure value with 15 bit resolution about every 1 ms within the output registers of the internal asic. in order to use the sensor for digital signal readout, it should be connected to a bidirectional i2c-bus. according to the i2c-bus specification, the bus is controlled by a master device, which generates the clock signal, controls the bus access and generates start and stop conditions. the hca-baro is designed to work as a slave, hence it will only respond to requests from a master device. digital i2c interface the hca-baro complies with the following protocol (fig. 1): bus not busy : during idle periods both data line (sda) and clock line (scl) remain high. start condition (s) : high to low transition of sda line while clock (scl) is high is interpreted as start con- dition. start conditions are always generated by the master. each initial request for a pressure value has to begin with a start condition. stop condition (p) : low to high transition of sda line while clock (scl) is high determines stop condition. stop conditions are always generated by the master. more than one request for the current pressure value can be trans- mitted without generation of intermediate stop condition. data valid (d) : state of data line represents valid data when, after start condition, data line is stable for duration of high period of clock signal. data on line must be changed during low period of clock signal. there is one clock pulse per bit of data. acknowledge (a) : data is transferred in pieces of 8 bits (1 byte) on serial bus, msb first. after each byte receiving device ? whether master or slave ? is obliged to pull data line low as acknowledge for reception of data. master must generate an extra clock pulse for this pur- pose. when acknowledge is missed, slave transmitter becomes inactive. it is on master either to send last com- mand again or to generate stop condition in that case. slave address : the i2c-bus master-slave concept requires a unique address for each device. the hca-baro has a preconfigured slave address (1111000xb). by factory programming it is possible to define a secondary slave address additional to the general one. according to i2c specification 127 different addresses are available. the sensor will then listen to both slave addresses. after generating a start condition the master sends the address byte containing a 7 bit address followed by a data direction bit (r/w). a "0" indicates a transmission from master to slave (write), a "1" indicates a data request (read). data operation : the hca-baro starts to send 2 data bytes containing the current pressure value as a 15 bit information placed in the output registers. sda scl start condition data valid data allowed to change stop condition r/w read out of first pressure value read out of n pressure values (optional) s data byte 1 a data byte 2 slave address a 1 a p data byte 1 generated by master generated by slave s = start condition a = acknowledge p = stop condition data byte 1 = high byte (msb first) data byte 2 = low byte (lsb last) fig. 1: i2c bus protocol
hca-baro series miniature amplified barometric pressure sensors 4/6 e / 11641 / a www.sensortechnics.com i2c interface parameters r e t e m a r a pl o b m y s. n i m. p y t. x a mt i n u l e v e l h g i h t u p n i 0 90 0 1 s v f o % l e v e l w o l t u p n i 00 1 l e v e l w o l t u p t u o 0 1 r o t s i s e r p u - l l u p 0 0 5 ? a d s @ e c n a t i c a p a c d a o l c a d s 0 0 4 f p l c s / a d s @ e c n a t i c a p a c t u p n i c n i _ c 2 i 0 1 y c n e u q e r f k c o l c l c s f l c s * 0 0 10 0 4z h k n o i t i d n o c t r a t s d n a p o t s n e e w t e b e m i t e e r f s u b t f u b 3 . 1 s , n o i t i d n o c t r a t s ) d e t a e p e r ( e m i t d l o he s l u p k c o l c t s r i f o t t a t s . d h 8 . 0 l c s f o d o i r e p w o l t w o l 3 . 1 l c s f o d o i r e p h g i h t h g i h 6 . 0 n o i t i d n o c t r a t s d e t a e p e r e m i t p u t e s t a t s . u s 1 e m i t d l o h a t a d t t a d . d h 0 e m i t p u t e s a t a d t t a d . u s 2 . 0 l c s d n a a d s h t o b f o e m i t e s i r t r 3 . 0 l c s d n a a d s h t o b f o e m i t l l a f t f 3 . 0 n o i t i d n o c p o t s r o f e m i t p u t e s t o t s . u s 6 . 0 t hd;sta t su;dat t hd;dat t su;sta t r t f scl sda t high t low t su;sto t buf t hd;sta sda scl note: sensortechnics recommends communication speeds of at least 100 khz (max. 400 khz). please contact your nearest sensortechnics sales office for further information. * recommended fig. 2: timing characteristics
hca-baro series miniature amplified barometric pressure sensors 5/6 e / 11641 / a www.sensortechnics.com 12.70 10.70 4.06 0.46 2.54 high pressure port 3 4.20 16 1.28 2 9.50 1.90 3.70 3 8 7 6 5 1 2 3 4 4.3 2.5 6.4 n i pn o i t c e n n o c 1s v + 2d n g 3t u o v 4* c / i 5l c s 6 * c / i 7 8a d s * internal connection. do not connect for any reason hca...h8 smd single port physical dimensions and electrical connections n i pn o i t c e n n o c 1s v + 2d n g 3t u o v 4* c / i * internal connection. do not connect for any reason 10.30 16 12.70 1 2 3 4 0.51 2.54 9.50 2 1.90 10.70 3 4.20 3.70 3 1.90 10.70 0.25 1.45 high pressure port 4.3 2.5 6.4 hca...g8 single port dimensions in mm third angle projection dimensions in mm third angle projection top view top view
hca-baro series miniature amplified barometric pressure sensors 6/6 e / 11641 / a www.sensortechnics.com ordering information sensortechnics reserve the right to make changes to any products herein. sensortechnics do not assume any liability arising out of the application or use of any product or circuit described herein, neither does it convey any license under its patent rights nor t he rights of others. custom specific mechanical or electronic sensor modifications are widely available: 3 v power supply spi, switching and custom specific outputs dual inline packages (dip) ... etc. please contact your nearest sensortechnics sales office for further information. s e i r e s e g n a r e r u s s e r p e d o m e r u s s e r p n o i t a r b i l a c g n i s u o h g n i t r o p s n o i t p oa c h 1 1 6 0 r a b m 0 0 1 1 . . . 0 0 6 a e t u l o s b a r c i r t e m o r a b * g l i s 8 t h g i a r t s 1 1 8 0 r a b m 0 0 1 1 . . . 0 0 8 h d m s 9 d e b r a b e l b a l i a v a t o n * t u p t u o l a t i g i d h t i w : e l p m a x e a c h 1 1 6 0 a r h 8 sensortechnics pro services: extended guarantee period of 2 years custom product modifications and adaptations even for small quantities advanced logistics models for supply inventory and short delivery times technical support through application engineers on the phone or at your site traceability of each sensor through serial numbers on request no product specification changes without customer notification no product obsolescence without very early prior notice fastest possible technical response for design and qa engineers long term product availability for your spares and service needs ... plus other services on request
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