MS5805-02BA01 TEC | Alldatasheet
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SENSOR SOLUTIONS ///MS5805-02BA01 Page 1 09/2015 MS5805-02BA01 Miniature Altimeter Module SPECIFICATIONS High resolution module, 20 cm Fast conversion down to 0.5 ms Low power, 0.6 µA (standby < 0.15 µA at 25°C) Integrated digital pressure sensor (24 bit ΔΣ ADC) Supply voltage 1.8 to 3.6 V Operating range: 300 to 1200 mbar, -40 to +85 °C Extended pressure range: 10 to 2000 mbar I2C interface No external components (Internal oscillator) Excellent long term stability Sealing designed for 2.5 x 1mm O-ring The MS5805-02BA is a new generation of high-resolution altimeter sensors from MEAS Switzerland with I 2C bus interface. It is optimized for altimeters and variometers with an altitude resolution of 20 cm. The sensor module includes a high-linearity pressure sensor and an ultra low power 24 bit ΔΣ ADC with internal factory-calibrated coefficients. It provides a precise digital
24 Bit pressure and temperature value and different operation
modes that allow the user to optimize for conversion speed and current consumption. A high-resolution temperature output allows the implementation of an altimeter/thermometer function without any additional sensor. The MS5805-02BA can be interfaced to virtually any microcontroller. The communication protocol is simple, without the need of programming internal registers in the device. This new sensor module generation is based on leading MEMS technology and latest benefits from MEAS Switzerland proven experience and know-how in high volume manufacturing of altimeter modules, which have been widely used for over a decade. The sensing principle employed leads to very low hysteresis and high stability of both pressure and temperature signal.
Miniature Altimeter Module SENSOR SOLUTIONS /// MS5805-02BA01 09/2015 Page 2
FEATURES
Mobile altimeter / barometer systems Bike computers Adventure or multi-mode watches Variometers Dataloggers TECHNICAL DATA Sensor Performances (VDD = 3 V) Pressure Min Typ Max Unit Range 10 2000 mbar ADC 24 bit Resolution (1) 0.35 / 0.19 / 0.11 / 0.06 / 0.03 / 0.02 mbar Accuracy 25°C, 750 to 1100 mbar -2 +2 mbar Accuracy -20°C to + 85°C, 300 to 1200 mbar (2) -4 +4 mbar Response time 0.5 / 1.1 / 2.1 / 4.1 / 8.22 / 16.44 ms Long term stability ±1 mbar/yr Temperature Min Typ Max Unit Range -40 +85 °C Resolution <0.01 °C Accuracy -1 +1 °C Notes: (1) Oversampling Ratio: 256 / 512 / 1024 / 2048 / 4096/ 8192 (2) With autozero at one pressure point FUNCTIONAL BLOCK DIAGRAM VDD GND SCL SDA ADC I2C Bus Interface Memory (PROM) 112 bits SENSOR SGND +IN -IN dig. Filter Sensor Interface IC
Miniature Altimeter Module SENSOR SOLUTIONS /// MS5805-02BA01 09/2015 Page 3 PERFORMANCE SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS Parameter Symbol Conditions Min. Typ. Max Unit Supply voltage VDD -0.3 +3.6 V Storage temperature TS -20 +85 °C Overpressure Pmax 5 bar Maximum Soldering Temperature Tmax 40 sec max 250 °C ESD rating Human Body Model -2 +2 kV Latch up JEDEC standard No 78 -100 +100 mA
ELECTRICAL CHARACTERISTICS
Parameter Symbol Conditions Min. Typ. Max Unit Operating Supply voltage VDD 1.8 3.0 3.6 V Operating Temperature T -40 +25 +85 °C Supply current (1 sample per sec.) IDD OSR 8192 4096 2048 1024 512 256 20.09 10.05 5.02 2.51 1.26 0.63 µA Peak supply current during conversion 1.25 mA Standby supply current at 25°C (VDD = 3.0 V) 0.01 0.1 µA VDD Capacitor From VDD to GND 100 470 nF ANALOG DIGITAL CONVERTER (ADC) Parameter Symbol Conditions Min. Typ. Max Unit Output Word 24 bit Conversion time tc OSR 8192 4096 2048 1024 512 256 16.44 8.22 4.13 2.08 1.06 0.54 ms
Miniature Altimeter Module SENSOR SOLUTIONS /// MS5805-02BA01 09/2015 Page 4 PERFORMANCE SPECIFICATIONS (CONTINUED) PRESSURE OUTPUT CHARACTERISTICS (VDD = 3 V, T = 25°C UNLESS OTHERWISE NOTED) Parameter Conditions Min. Typ. Max Unit Operating Pressure Range Prange Full Accuracy 300 1200 mbar Extended Pressure Range Pext Linear Range of ADC 10 2000 mbar Absolute Accuracy, no autozero at 25°C, 750..1100 mbar -2 +2 mbar Absolute Accuracy, autozero at one pressure point 300..1200 mbar at 25°C -4 +2 +4 mbar Maximum error with supply voltage VDD = 1.8 V … 3.6 V ±2.5 mbar Long-term stability ±1 mbar/yr Resolution RMS OSR 8192 4096 2048 1024 512 256 0.02 0.03 0.06 0.11 0.19 0.35 mbar Reflow soldering impact IPC/JEDEC J-STD-020C (See application note AN808 on http://meas-spec.com) -1.5 mbar Recovering time after reflow (1) 5 days (1) Time to recover at least 66% of the reflow impact. TEMPERATURE OUTPUT CHARACTERISTICS (VDD = 3 V, T = 25°C UNLESS OTHERWISE NOTED) Parameter Conditions Min. Typ. Max Unit Absolute Accuracy at 25°C -20..85°C -2 +1 +2 °C Maximum error with supply voltage Resolution RMS (to confirm with measured values) OSR 8192 4096 2048 1024 512 256 0.002 0.003 0.004 0.006 0.009 0.012
Miniature Altimeter Module SENSOR SOLUTIONS /// MS5805-02BA01 09/2015 Page 5 PERFORMANCE SPECIFICATIONS (CONTINUED) DIGITAL INPUTS (SDA, SCL) Parameter Symbol Conditions Min. Typ. Max Unit Serial data clock SCL 400 kHz Input high voltage VIH 80% VDD 100% VDD V Input low voltage VIL 0% VDD 20% VDD V Input leakage current Ileak25°C Ileak85°C at 25°c 0.1 µA DIGITAL OUTPUTS (I2C, DOUT) Parameter Symbol Conditions Min. Typ. Max Unit Output high voltage VOH Isource = 0.6 mA 80% VDD 100% VDD V Output low voltage VOL Isink = 0.6 mA 0% VDD 20% VDD V Load capacitance CLOAD 16 pF
Miniature Altimeter Module SENSOR SOLUTIONS /// MS5805-02BA01 09/2015 Page 6 TYPICAL PERFORMANCE CHARACTERISTICS PRESSURE AND TEMPERATURE ERROR VS PRESSURE AND TEMPERATURE (TYPICAL VALUES) PRESSURE AND TEMPERATURE ERROR VS POWER SUPPLY (TYPICAL VALUES)
Miniature Altimeter Module SENSOR SOLUTIONS /// MS5805-02BA01 09/2015 Page 7 FUNCTIONAL DESCRIPTION VDD GND SCL SDA ADC I2C Bus Interface Memory (PROM) 112 bits SENSOR SGND +IN -IN dig. Filter Sensor Interface IC Figure 1: Block diagram of MS5805-02BA GENERAL The MS5805-02BA consists of a piezo-resistive sensor and a sensor interfa ce integrated circuit. The main function of the MS5805-02BA is to convert the uncompensated analogue output volt age from the piezo-resistive pressure sensor to a 24-bit digital value, as well as providing a 24-bit digital value for the temperature of the sensor. FACTORY CALIBRATION Every module is individually factory calibrated at two temperatures and t wo pressures. As a result, 6 coefficients necessary to compensate for process variations and temperature variations are calc ulated and stored in the 1 12- bit PROM of each module. These bits (partitioned into 6 coefficients) must be rea d by the microcontroller software and used in the program converting D1 and D2 into compensated pressure and temperature values. COMMUNICATION INTERFACE The MS5805-02BA has been built with I2C serial interface. Module ref Mode Pins used MS5805-02BA01 I2C SDA, SCL The external microcontroller clocks in the data through the input SCL (Serial CLock) and SDA (Serial DAta). The sensor responds on the same pin SDA which is bidirectional for the I 2C bus interface. So this interface type uses only 2 signal lines and does not require a chip select.
Miniature Altimeter Module SENSOR SOLUTIONS /// MS5805-02BA01 09/2015 Page 8 PRESSURE AND TEMPERATURE CALCULATION Figure 2: Flow chart for pressure and temperature reading and software compensation. Size [1] [bit] min Pressure sensitivity | SENS unsigned int 16 65535 46372 Pressure offset | OFF unsigned int 16 65535 43981 Temperature coefficient of pressure sensitivity | TCS unsigned int 16 65535 29059 Temperature coefficient of pressure offset | TCO unsigned int 16 65535 27842 Reference temperature | T REF unsigned int 16 65535 31553 Temperature coefficient of the temperature | TEMPSENS unsigned int 16 65535 28165 Digital pressure value unsigned int 32 16777216 6465444 Digital temperature value unsigned int 32 16777216 8077636 dT Difference between actual and reference temperature [2] dT = D2 - T REF C5 * 2 signed int 32 -16776960 16777216 2000 = 20.00 °C OFF Offset at actual temperature [3] OFF OFF TCO dT = (C4 dT signed int 64 -17179344900 25769410560 5764707214 SENS Sensitivity at actual temperature [4] SENS SENS TCS dT C1 * 2 dT signed int 64 -8589672450 12884705280 3039050829 110002 = 1100.02 mbar Notes [1] [2] [3] [4] min and max have to be defined min and max have to be defined Maximal size of intermediate result during evaluation of variable 120000 1000 P Recommended variable type Description | Equation signed int 32 Actual temperature (-40…85°C with 0.01°C resolution) TEMP 20°C dT TEMPSENS 2000 dT Read digital pressure and temperature data signed int 32 Temperature compensated pressure (10…1200mbar with 0.01mbar resolution) P = D1 * SENS - OFF = (D1 * SENS / 2 - OFF) / 2 min and max have to be defined Convert calibration data into coefficients (see bit pattern of W1 to W4) Variable Example / Typical Value Calculate temperature compensated pressure 8500 -4000 TEMP Start Maximum values for calculation results: P MIN = 10mbar P MAX = 2000mbar T MIN = -40°C T MAX = 85°C T REF = 20°C Read calibration data (factory calibrated) from PROM Read digital pressure and temperature data Calculate temperature Calculate temperature compensated pressure Pressure and temperature value first order max
Miniature Altimeter Module SENSOR SOLUTIONS /// MS5805-02BA01 09/2015 Page 9 SECOND ORDER TEMPERATURE COMPENSATION The results of the last first order calculation are entered in the following chart to obtain the pressure and temperature compensated with the 2nd order: P2 and TEMP2. Yes No SENSi = 63 (TEMP – 2000)2/ 25 SENS2 = SENS - SENSi TEMP<20°C Low temperature Ti = 11 dT OFFi = 31 (TEMP – 2000)2 / 23 OFF2 = OFF - OFFi TEMP2 = (TEMP – Ti) / 100 [°C] Low temperature Calculate pressure and temperature 2nd order Pressure and temperature value first order P2 = (( D1 * SENS2 / 221 – OFF2 ) / 215 ) / 100 [mbar] Figure 3: Flow chart for pressure and temperature to the optimum accuracy.
Miniature Altimeter Module SENSOR SOLUTIONS /// MS5805-02BA01 09/2015 Page 10 I2C INTERFACE COMMANDS The MS5805-02BA has only five basic commands: 1. Reset 2. Read PROM (1 12 bit of calibration words) 3. D1 conversion 4. D2 conversion 5. Read ADC result (24 bit pressure / temperature) Each I 2C communication message starts with the start condition and it is ended with the stop condition. The MS5805-02BA address is 1110110x (write : x=0, read : x=1). Size of each command is 1 byte (8 bits) as described in the table below . After ADC read commands the device will return 24 bit result and after the PROM read 16bit result. The address of the P ROM is embedded inside of the PROM read command using the a2, a1 and a0 bits. Command byte hex value Bit number 0 1 2 3 4 5 6 7 Bit name PRO M CO NV - Typ Ad2/ Os2 Ad1/ Os1 Ad0/ Os0 Stop Command Reset 0 0 0 1 1 1 1 0 0x1E Convert D1 (OSR=256) 0 1 0 0 0 0 0 0 0x40 Convert D1 (OSR=512) 0 1 0 0 0 0 1 0 0x42 Convert D1 (OSR=1024) 0 1 0 0 0 1 0 0 0x44 Convert D1 (OSR=2048) 0 1 0 0 0 1 1 0 0x46 Convert D1 (OSR=4096) 0 1 0 0 1 0 0 0 0x48 Convert D1 (OSR=8192) 0 1 0 0 1 0 1 0 0x4A Convert D2 (OSR=256) 0 1 0 1 0 0 0 0 0x50 Convert D2 (OSR=512) 0 1 0 1 0 0 1 0 0x52 Convert D2 (OSR=1024) 0 1 0 1 0 1 0 0 0x54 Convert D2 (OSR=2048) 0 1 0 1 0 1 1 0 0x56 Convert D2 (OSR=4096) 0 1 0 1 1 0 0 0 0x58 Convert D2 (OSR=8192) 0 1 0 1 1 0 1 0 0x5A ADC Read 0 0 0 0 0 0 0 0 0x00 PROM Read 1 0 1 0 Ad2 Ad1 Ad0 0 0xA0 to 0xAE Figure 4: Command structure
Miniature Altimeter Module SENSOR SOLUTIONS /// MS5805-02BA01 09/2015 Page 13 CYCLIC REDUNDANCY CHECK (CRC) MS5805-02BA contains a PROM memory with 1 12-Bit. A 4-bit CRC has been implemented to check the data validity in memory. The C code example below describes the CRC calculation whi ch is stored on DB12 to DB15 in the first PROM word. A d d D B D B D B D B D B D B D B D B D B D B D B D B D B D B D B D B
0 CRC Factory defined
Figure 11: Memory PROM mapping C Code example for CRC-4 calculation: unsigned char crc4(unsigned int n_prom[]) // n_prom defined as 8x unsigned int (n_prom[8]) int cnt; // simple counter unsigned int n_rem=0; // crc reminder unsigned char n_bit; n_prom[0]=((n_prom[0]) & 0x0FFF); // CRC byte is replaced by 0 n_prom[7]=0; // Subsidiary value, set to 0 for (cnt = 0; cnt < 16; cnt++) // operation is performed on bytes { // choose LSB or MSB if (cnt%2==1) n_rem ^= (unsigned short) ((n_prom[cnt>>1]) & 0x00FF); else n_rem ^= (unsigned short) (n_prom[cnt>>1]>>8); for (n_bit = 8; n_bit > 0; n_bit--) if (n_rem & (0x8000)) n_rem = (n_rem << 1) ^ 0x3000; else n_rem = (n_rem << 1); n_rem= ((n_rem >> 12) & 0x000F); // final 4-bit reminder is CRC code return (n_rem ^ 0x00);
Miniature Altimeter Module SENSOR SOLUTIONS /// MS5805-02BA01 09/2015 Page 14 APPLICATION CIRCUIT The MS5805-02BA is a circuit that can be used in conjunction with a microc ontroller in mobile altimeter applications. It is designed for low-voltage systems with a supply voltage of 3 V. Figure 12: Typical application circuit with I2C protocol communication
Miniature Altimeter Module SENSOR SOLUTIONS /// MS5805-02BA01 09/2015 Page 15 PIN CONFIGURATION Figure 13: pin configuration Pin Name Type Function
1 VDD P Positive supply voltage
2 SCL I Serial data Clock
3 SDA IO I2C data IO
4 GND P Ground
Figure 14: MS5805-02BA package outlines Notes: (1) Dimensions in mm (2) Interpret Dim and tolerance per ASME Y14.5M - 1994 (3) Angular dimensions ± 0.3° (4) Hole locations ± 0.1 (4) Linear dimension ± 0.1 (5) Cap centering ± 0.15 from center of the ceramic
Miniature Altimeter Module SENSOR SOLUTIONS /// MS5805-02BA01 09/2015 Page 17 MOUNTING AND ASSEMBLY CONSIDERATIONS SOLDERING Please refer to the application note AN808 available on our website for all soldering issues. CONNECTION TO PCB The package outline of the module allows the use of a flexible PCB for interco nnection. This can be important for applications in watches and other special devices. CLEANING The MS5805-02BA has been manufactured under cleanroom conditions. It is therefore rec ommended to assemble the sensor under class 10’000 or better conditions. Should this not be possible, it is recommended to protect the sensor opening during assembly from entering particles and dust. To av oid cleaning of the PCB, solder paste of type “no-clean” shall be used. Cleaning might damage the sensor! ESD PRECAUTIONS The electrical contact pads are protected against ESD up to 2 kV HBM (human body mod el). It is therefore essential to ground machines and personnel properly during assembly and handling of the device. The MS5805-02BA is shipped in antistatic transport boxes. Any test adapters or production transport boxes used during the assembly of the sensor shall be of an equivalent antistatic material. DECOUPLING CAPACITOR Particular care must be taken when connecting the device to the power supply. A 100 nF ceramic capacitor must be placed as close as possible to the MS5805-02BA VDD pin. This capacitor will stab ilize the power supply during data conversion and thus, provide the highest possible accuracy.
Miniature Altimeter Module SENSOR SOLUTIONS /// MS5805-02BA01 09/2015 Page 18
ORDERING INFORMATION
Part Number / Art. Number Product Delivery Form MS580502BA01-50 MS5805-02BA Miniature Altimeter Module T&R Tape& reel TOP-UP TE.com/sensorsolutions Measurement Specialties, Inc., a TE Connectivity company. Measurement Specialties, TE Connectivity, TE Connectivity (logo) and EVERY 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 any liability in connection with its use. TE Connectivity‘s obligations shall only be as set forth in TE Connectivity‘s Standard Terms and Conditions of Sale for this product and in no cas e will TE Connectivity be liable for any incidental, indirect or consequential damages arising out of the sale, resale, use or misuse of the product. Users of TE Connectivity products should make their own evaluation to determine the suitability of each such product for the specific application. © 2015 TE Connectivity Ltd. family of companies All Rights Reserved. MS580502BA01_003
000058052459 ECN2317
Measurement Specialties, Inc., a TE Connectivity Company
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