Hope RF HP03 Series of calibrated sensor module HP03S 2010-2-3 Version: 1.3 . Integrated pressure sensor . 300-1100hpa absolute Pressure Range . 16 Bit Σ−Δ ADC . 11 coefficients for software compensation stored on chip . I2C Serial Interface . One system clock line (32768Hz) . One hardware controlled reset line . Low voltage, low power consumption Description The HP03S pressure module includes a piezo-resistive pressure sensor and an ADC interface. It provides 16 bit word data for pressure and temperature 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 temperature reading can be realized. HM03S is a low power, low voltage device with automatic power down switching. I2C Serial Interface is used for communications with a microprocessor. Sensor packaging options are DIP or SMD (with metal cap) Features . 14 Bit ADC resolution . Supply voltage 2.2v-3.6v . -40°C to + 85°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 Page 1 of 7 Hope RF HP03 Series of calibrated sensor module HP03S 2010-2-3 Version: 1.3 PIN Description Pin Name VSS VDD MCLK XCLR SDA Pin Number 6 5 4 3 2 Type G P I I I/O Function power ground power VCC master clock(32k) input ADC reset input (keep low when system is in idle state) . I2C data input and output SCL 1 I I2C 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 significantly influence the current consumption of the pressure module. To obtain minimum current, remember to supply good quality MCLK signal Absolute Maximum Ratings Parameter Supply Voltage Over pressure Symbol VDD P Min -0.3 Max 4 15 Unit V Bar(abs) Storage Temperature Tstg -40 125 °C Recommended Operating Conditions Parameter Supply Voltage Supply Current Symbol Conditions VDD I VDD=3V Min 2.2 during conversion Max 3.6 1 P T 300 -40 30 40% T 25 32768 50% SCL Unit V V μΑ μΑ 500 Stand by Operating Pressure Range Operating Temperature Range MCLK Duty Cycle of MCLK Serial Date Rate Typ 3 1100 hpa (abs) 85 35 60% 500 KHz % KHz °C Pressure and Temperature Output Characteristics With the calibration data provided by the HP03 system, it should be able to reach the following characteristics: Parameter Symbol Absolute Pressure Accuracy HP03SA Absolute Pressure Accuracy HP03SB Absolute Pressure Accuracy HP03SA Absolute Pressure Accuracy HP03SB Long Term Stability Conditions 750-1100 @ 0～50 750-1100 @ 0～50 750-1100 @ -20～60 750-1100 @ -20～60 12 month Min Typ Max Unit -1.5 1.5 hpa -3.0 3.0 hpa -3.0 3.0 hpa -5.0 5.0 hpa 2 hpa Page 2 of 7 Hope RF HP03 Series of calibrated sensor module HP03S 2010-2-3 Version: 1.3 VDD Dependency 2.4~3.6 -1.5 0 1.5 Temperature Accuracy 0~+50 -1.0 1.0 Temperature Accuracy -20~+60 -2.0 2.0 hpa °C °C 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, the following two values can be obtained: . measured temperature “D2” . measured pressure “D1” As the sensor is strongly temperature dependent, it is necessary to compensate for these effects. Therefore 10 sensor-specific coefficients 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 . Offset coefficient . Temperature Coefficient of Sensitivity . Temperature Coefficient of Offset . Reference Temperature . Temperature Coefficient of Temperature . Offset Fine Tuning “C1” “C2” “C3” “C4” “C5” “C6” “C7” 4 sensor parameter . Sensor Specific Parameter “A,B,C,D” Note: Make sure to pull low XCLR before start to Read these coefficients or the data read out is probably incorrect Parameter Range(Hex:Dec) C1 C2 C3 C4 C5 C6 C7 0x100 -- 0xFFFF 0x00 -- 0x1FFF 0x00 -- 0x400 0x00 -- 0x1000 0x1000 -- 0xFFFF 0x00 -- 0x4000 0x960 -- 0xA28 C,D A,B D1 D2 0x01 -- 0x0F 0x01 -- 0x3F 0x00 -- 0xFFFF 0x00 -- 0xFFFF : ; ; ; ; ; ; ; ; ; ; 256 -- 65535 0 -- 8191 0 -- 3000 0 -- 4096 4096 -- 65535 0 -- 16384 2400 -- 2600 1 -- 15 1 -- 63 0 -- 65535 0 -- 65535 Page 3 of 7 Hope RF HP03 Series of calibrated sensor module HP03S 2010-2-3 Version: 1.3 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, sensitivity 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, recommend 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)*(4107-9191)/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 Page 4 of 7 Hope RF HP03 Series of calibrated sensor module HP03S 2010-2-3 P= 23738 * 10 /2^5 + 2500 = 9918 = 991.8hpa Version: 1.3 T= 250 + (-5478) * 3990 /2^16- (-5478/2^9) =-72 = -7.2°C Serial Interface The I2C interface is used for accessing calibration data as well as reading measurement result from AD conversion. The EEPROM and ADC is sharing the same I2C 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 and 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 C1(MSB:LSB) C2(MSB:LSB) C3(MSB:LSB) C4(MSB:LSB) C5(MSB:LSB) C6(MSB:LSB) C7(MSB:LSB) A B C D EEPROM ADDRESS (16:17) (18:19) (20:21) (22:23) (24:25) (26:27) (28:29) (30) (31) (32) (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 N P Temperature Measure: S 11101110 A 11111111 A 11101000 A P D S 11101110 A 11111101 A S 11101111 A MSB A LSB N P S: start condition P: stop condition A ( bold) : acknowledge from slave A : acknowledge from master N: no acknowledge from master (send out bit 1 instead) D : delay for 40ms minimum MSB: conversion result MSB LSB: conversion result LSB. Remark: Before start an AD conversion cycle, remember to pull high for XCLR pin so that the system is no longer in the reset state. Page 5 of 7 Hope RF HP03 Series of calibrated sensor module HP03S 2010-2-3 Version: 1.3 All data read from the module is in hex format. After first power on, the first read data should be disregarded, and only the second value should be used. This can assure that any unstable data after reset can be filtered out. Typical Application Circuit Diagram: Mechanical Dimension Page 6 of 7 Hope RF HP03 Series of calibrated sensor module HP03S 2010-2-3 Version: 1.3 Important Notices Never unplug the module when power is on. Do not use this product as safety or emergency stop device or in any application where failure of this product could lead in personal 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 indemnify and hold HOPE RF and its officers, employees, affiliates and distributors harmless against all claims, costs, damages and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury associated with such unintended or unauthorized use, even if such claim alleges that HOPE RF was negligent regarding the design or manufacturing of the part. Hope RF reserves the right, without further notice, to change the product specification and/or information in this document and to improve reliability, functions and design. Page 7 of 7