hope rf hp03 series of calibrated sensor module HP03SA 2008-5-5 version: 1.0 page 1 of 7 . integrated pressure sensor . 300-1100hpa absolute pressure range . 16 bit ? adc . 11 coefficients for software compensation stored on chip . i 2 c serial interface . one system clock line (32768hz) . one hardware controlled reset line . low voltage, low power consumption description the hp03 pressure module includes a piezo -resistive pressure sensor and an adc interface. it provides 16 bit word data for pressure and temp erature related voltage. with the help of a highly accurate calibration of the senor, 11 unique coefficients were stored on the chip, thus accurate pressure and temp erature reading can be realized. hm03 is a low power, low voltage device with au tomatic power down switching. i 2 c serial interface is used for communi cations with a microprocessor. sensor packaging options are dip or smd (with metal cap) features . 15 bit adc resolution . supply voltage 2.2v-3.6v . -20 c to + 60 c operating range . no external components required applications . pressure measurement and control systems . mobile altimeter/barometer systems . weather forecast products . adventure or multi-mode watches . gps receivers block diagram
hope rf hp03 series of calibrated sensor module HP03SA 2008-5-5 version: 1.0 page 2 of 7 pin description pin name pin number type function vss 1 g power ground vdd 2 p power vcc mclk 3 i master clock(32k) input xclr 4 i adc reset input (keep low when system is in idle state) sda 5 i/o . i 2 c data input and output scl 6 i i 2 c clock input * xclr is to reset the ad converter (active low). xclr should be set to high only during ad conversion phase(reading d1,d2), at all other states, such as reading calibration factors, this pin should be kept low. * the quality of the mclk signal can significant ly influence the current consumption of the pressure module. to obtain minimum current, remember to supply good quality mclk signal absolute maximum ratings parameter symbol min max unit supply voltage vdd -0.3 4 v over pressure p 15 bar(abs) storage temperature tstg -30 90 c recommended operating conditions parameter symbol conditions min typ max unit supply voltage vdd 2.2 3 3.6 v supply current i vdd=3v v during conversion 500 ? stand by 1 ? operating pressure range p 300 1100 hpa (abs) -20 25 60 c operating temperature range t HP03SA tbd 60 c conversion time t mclk=32k 30 35 khz duty cycle of mclk 40% 50% 60% % serial date rate scl 500 khz pressure and temperature output characteristics with the calibration data pr ovided by the hp03 system, it should be able to reach the following characteristics: parameter symbol conditions min typ max unit resolution 0.1 hpa relative pressure accuracy 750-1100 -1 1 hpa absolute pressure accuracy 750-1100 -1.5 1.5 hpa maximum error over temperature -20~+60 -3 3 hpa long term stability 12 month 2 hpa vdd dependency 2.4~3.6 -1.5 0 1.5 hpa temperature accuracy -0.8 0.8 c
hope rf hp03 series of calibrated sensor module HP03SA 2008-5-5 version: 1.0 page 3 of 7 pressure and temperature measurement the main function of hp03 system is to convert the uncompensated pressure and temperature signal from a pressure sensor. after the conversion, th e following two values can be obtained: . measured temperature ?d2? . measured pressure ?d1? as the sensor is strongly temp erature dependent, it is necessa ry to compensate for these effects. therefore 10 sensor-specific coe fficients are stored on the hp03 at our manufacturing facility, and they allow an accurate software compensation in the application. the 7 coefficients are: . sensitivity coefficient ?c1? . offset coefficient ?c2? . temperature coefficient of sensitivity ?c3? . temperature coefficient of offset ?c4? . reference temperature ?c5? . temperature coefficien t of temperature ?c6? . offset fine tuning ?c7? 4 sensor parameter . sensor specific parameter ?a,b,c,d? parameter ran ge(hex:dec) c1 0x100 -- 0x7fff : 256 -- 32767 c2 0x00 -- 0x1fff ; 0 -- 8191 c3 0x00 -- 0x400 ; 0 -- 3000 c4 0x00 -- 0x1000 ; 0 -- 4096 c5 0x1000 -- 0x8000 ; 4096 -- 32768 c6 0x00 -- 0x4000 ; 0 -- 16384 c7 0x960 -- 0xa28 ; 2400 -- 2600 c,d 0x01 -- 0x0f ; 1 -- 15 a,b 0x01 -- 0x3f ; 1 -- 63 d1 0x00 -- 0xffff ; 0 -- 65535 d2 0x00 -- 0xffff ; 0 -- 65535
hope rf hp03 series of calibrated sensor module HP03SA 2008-5-5 version: 1.0 page 4 of 7 pressure and temperature calculation: step 1: (get temperature value) d2>=c5 dut= d2-c5 - ((d2-c5 )/2^7) * ((d2-c5)/2^7) * a / 2^c d2 < c5 dut= d2-c5 - ((d2- c5)/2^7) * ((d2-c5)/2^7) * b / 2^c step 2: (calculate offset, sensit ivity and final pressure value) off=(c2+(c4-1024)*dut/2^14)*4 sens = c1+ c3*dut/2^10 x= sens * (d1-7168)/2^14 - off p=x*10/2^5+c7 ? for altitude measurement system, re commend to use p=x*100/2^5+c7*10 ? so that better altitude resolution can be achieved step 3: (calculate temperature) t = 250 + dut * c6 / 2 ^ 16-dut/2^d example: c1=29908 c2=3724 c3=312 c4=441 c5=9191 c6=3990 c7=2500 a=1 b=4 c=4 d=9 d1=30036 d2=4107 dut = (4107-9191) - ((4107-9191)*(4107-919 1)/128^2) * 4 / 2^4 = -5478 off = (3724 + (441-1024) * (-5478) / 2^14) * 4 =15675 sens= 29908 + 312 * (-5478) / 2^10 = 28238 x= 28238 * (30036-7168) / 2^14 ? 15675 = 23738 p= 23738 * 10 /2^5 + 2500 = 9918 = 991.8hpa t= 250 + (-5478) * 3990 /2^16- (-5478/2^9) =-72 = -7.2 c
hope rf hp03 series of calibrated sensor module HP03SA 2008-5-5 version: 1.0 page 5 of 7 serial interface the i 2 c interface is used for accessing calibration data as well as reading measurement result from ad conversion. the eeprom and adc is sharing the same i 2 c bus but with different chip address assigned. the eeprom chip address is set to 0xa1(in the case of read), write operation is not allowed. for ad part, the chip address is set to 0xee. so this module used two different addresses for calibration data a nd ad converting data accessing. calibration eeprom data read operation is fully compatible to 24c02. bus drive timing should be referred to the specification of this part as well. coefficient eeprom address c1(msb:lsb) (16:17) c2(msb:lsb) (18:19) c3(msb:lsb) (20:21) c4(msb:lsb) (22:23) c5(msb:lsb) (24:25) c6(msb:lsb) (26:27) c7(msb:lsb) (28:29) a (30) b (31) c (32) d (33) ad chip address is set to 0xee(device write address), 0xef(device read address). in order to get the ad value d1 and d2, you have to follow the following timing sequence: pressure measure: s 11101110 a 11111111 a 11110000 a p d s 11101110 a 11111101 a s 11101111 a msb a lsb np temperature measure: s 11101110 a 11111111 a 11101000 a p d s 11101110 a 11111101 a s 11101111 a msb a lsb np s: start condition p: stop condition a ( bold ) : acknowledge from slave a : acknowledge from master n: no acknowledge from master (send out b it 1 instead) d : delay for 40ms minimum msb: conversion result msb lsb: conversion result lsb. remark: before start an ad conversion cycle, rememb er to pull high for xclr pin so that the system is no longer in the reset state. all data read from the module is in hex format. after first power on, the first read data shoul d be disregarded, and only the second value should be used. this can assure that any unsta ble data after reset can be filtered out.
hope rf hp03 series of calibrated sensor module HP03SA 2008-5-5 version: 1.0 page 6 of 7 typical application circuit diagram: mechanical dimension
hope rf hp03 series of calibrated sensor module HP03SA 2008-5-5 version: 1.0 page 7 of 7 important notices never unplug the module when power is on. do not use this product as safety or emerge ncy stop device or in any application where failure of this product could lead in pers onal injury. failure to comply with these instructions could result with death or serious injury. should buyer purchase or use hope rf products for any such unintended or unauthorized application, buyer should inde mnify and hold hope rf and its officers, employees, affiliates and distributors harmle ss against all claims, costs, damages and expenses, and reasonable attorney fees arising out of, directly or i ndirectly, any claim of personal injury associated with such unintende d or unauthorized use, even if such claim alleges that hope rf was negligent regarding the design or manufact uring of the part. hope rf reserves the right, without furthe r notice, to change the product specification and/or information in this document and to improve reliability, functions and design.
|
