MS4525HRD (High Resolution Digital) Integrated Digital Pressure Sensor (24-bit Σ ADC) Fast Conversion Down to 1 ms Low Power, 1 µa (standby < 0.15 µa) Supply Voltage: 1.8 to 3.6V Pressure Range: 1 to 150 PSI I 2 C and SPI Interface up to 20 MHz No External Components (Internal Oscillator) DESCRIPTION The MS4525HRD is a new generation of high resolution digital pressure sensors from MEAS with SPI and I 2 C bus interface. The sensor module includes a high linearity pressure sensor and an ultra low power 24-bit Σ 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 a thermometer function without any additional sensor. The MS4525HRD 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 proven experience and know-how in high volume manufacturing of pressure 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 FEATURES APPLICATIONS PSI Pressure Ranges Factory Automation PCB Mountable Altitude and Airspeed Measurements Digital Output Medical Instruments Barbed Pressure Ports Leak Detection STANDARD RANGES (PSI) Pressure Absolute Gauge Differential 1 DS, SS, TP, MM, DS, SS,TP, MM 2 DS, SS, TP, MM, DS, SS,TP, MM 5 DS, SS, TP, MM, DS, SS,TP,MM 15 SS, TP,MM DS, SS, TP, MM, DS, MM 30 SS, TP,MM DS, SS, TP, MM, DS, MM 50 SS, TP,MM DS, SS, TP, MM, DS, MM 100 SS, TP,MM DS, SS, TP, MM, DS, MM 150 SS, TP,MM DS, SS, TP, MM, DS, MM See Package Configurations: DS= Dual Side Port, SS= Single Side Port, TP= Top Port, MM= Dual Manifold Mount, MS4525HRD www.meas-spec.com October 2013 1/22
MS4525HRD (High Resolution Digital) BLOCK DIAGRAM ABSOLUTE MAXIMUM RATING Parameter Conditions Min Max Unit Symbol/Notes Supply Voltage T A = 25 C 1.8 3.6 V V DD Output Current T A = 25 C Storage Temperature -40 125 C Humidity T A = 25 C 95 %RH Non Condensing Overpressure T A = 25 C, both Ports 300 psi Burst Pressure T A = 25 C, Port 1 psi See Table 1 ESD HBM -4 +4 kv EN 61000-4-2 Solder Temperature 250 C, 5 sec max. Table 1- BURST PRESSURE BY RANGE AND PACKAGE STYLE Range DS SS, TP, MM Unit 001 20 20 psi 002 20 20 psi 005 15 20 psi 015 45 90 psi 030 90 200 psi 050 150 300 psi 100 300 300 psi 150 300 300 psi MS4525DO www.meas-spec.com October 2013 2/22
MS4525HRD (High Resolution Digital) OVERSAMPLNG RATIO (OSR) PERFORMANCE CHARACTERISTICS SUPPLY CURRENT CHARACTERISTICS Parameter Symbol Conditions Min. Typ. Max Unit OSR 4096 12.5 2048 6.3 Supply current I DD 1024 3.2 (1 sample per sec.) 512 1.7 µa 256 0.9 Peak supply current during conversion 1.4 ma Standby supply current at 25 C 0.02 0.14 µa ANALOG DIGITAL CONVERTER (ADC) Parameter Symbol Conditions Min. Typ. Max Unit OSR 4096 2048 7.40 3.72 8.22 4.13 9.04 4.54 Conversion time t c 1024 512 256 1.88 0.95 0.48 2.08 1.06 0.54 2.28 1.17 0.60 ms TEMPERATURE OUTPUT CHARACTERISTICS (V DD = 3 V, T = 25 C UNLESS OTHERWISE NOTED) Parameter Conditions Min. Typ. Max Unit OSR 4096 2048 0.002 0.003 Resolution RMS 1024 512 256 0.005 0.008 0.012 C Maximum error with supply voltage V DD = 1.8 V 3.6 V -0.5 +0.5 C MS4525HRD www.meas-spec.com October 2013 4/22
MS4525HRD (High Resolution Digital) INPUT/OUTPUT SPECIFICATIONS DIGITAL INPUTS (CSB, I 2 C, DIN, SCLK) Parameter Serial data clock Symbol SCLK Conditions SPI protocol Min. Typ. Max 20 Unit MHz Input high voltage V IH Pins CSB 80% V DD 100% V DD V Input low voltage V IL 0% V DD 20% V DD V Input leakage current I leak25 C I leak85 C at 25 C 0.15 µa Input capacitance C IN 6 pf PRESSURE OUTPUTS (I 2 C, DOUT) Parameter Symbol Conditions Min. Typ. Max Unit Output high voltage V OH I source = 1.0 ma 80% V DD 100% V DD V Output low voltage V OL I sink = 1.0 ma 0% V DD 20% V DD V Load capacitance C LOAD 16 pf MS4525HRD www.meas-spec.com October 2013 5/22
MS4525HRD (High Resolution Digital) PRESSURE AND TEMPERATURE CALCULATION Start Part Number: 4525HRD-150AS Maximum values for calculation results: Pmin=0 psia, Pmax=150 psia Tmin=-10 C, Tmax=85 C Read Calibration Data from PROM Variable Description Recommended Variable Type Size [1] Value [Bit] Min Max Example/ Typical C0 Bridge Offset Signed int 16 14-8192 8191-5922 C1 Gain Signed int 16 14-8192 8191 4514 C2 Non-Linearity 2nd Order Signed int 16 9-256 255 130 C3 Temperature Coefficient, Bridge Offset 1st order Signed int 16 10-512 511-42 C4 Temperature Coefficient, Bridge Offset 2nd order Signed int 16 9-256 255 31 C5 Temperature Coefficient, Gain 1st order Signed int 16 10-512 511-118 C6 Temperature Coefficient, Gain 2nd order Signed int 16 9-256 255 65 Q0 Calculation Factor 0 Unsigned char 8 3 0 7 7 Q1 Calculation Factor 1 Unsigned char 8 3 0 7 4 Q2 Calculation Factor 2 Unsigned char 8 3 0 7 5 A0 Temperature Coefficient 0 Signed char 8 8-128 127-42 A1 Temperature Coefficient 1 Signed char 8 8-128 127 72 A2 Temperature Coefficient 2 Signed char 8 8-128 127-25 Read Digital Pressure and Temperature Data D1 Digital Pressure Value Unsigned long 24 0 2 24 3614677 D2 Digital Temperature Value Unsigned long 24 0 2 24 8074792 MS4525HRD www.meas-spec.com October 2013 8/22
MS4525HRD (High Resolution Digital) MEMORY MAPPING [2] Memory Mapping Address 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 0 16 bit reserved for manufacturer 1 C0 13 C0 12 C0 11 C0 10 C0 09 C0 08 C0 07 C0 06 C0 05 C0 04 C0 03 C0 02 C0 01 C0 00 C1 13 C1 12 2 C1 11 C1 10 C1 09 C1 08 C1 07 C1 06 C1 05 C1 04 C1 03 C1 02 C1 01 C1 00 C2 08 C2 07 C2 06 C2 05 3 C2 04 C2 03 C2 02 C2 01 C2 00 C3 09 C3 08 C3 07 C3 06 C3 05 C3 04 C3 03 C3 02 C3 01 C3 00 C4 08 4 C4 07 C4 06 C4 05 C4 04 C4 03 C4 02 C4 01 C4 00 C5 09 C5 08 C5 07 C5 06 C5 05 C5 04 C5 03 C5 02 5 C5 01 C5 00 C6 08 C6 07 C6 06 C6 05 C6 04 C6 03 C6 02 C6 01 C6 00 Q0 02 Q0 01 Q0 00 Q1 02 Q1 01 6 Q1 00 Q2 02 Q2 01 Q2 00 A0 07 A0 06 A0 05 A0 04 A0 03 A0 02 A0 01 A0 00 A1 07 A1 06 A1 05 A1 04 7 A1 03 A1 02 A1 01 A1 00 A2 07 A2 06 A2 05 A2 04 A2 03 A2 02 A2 01 A2 00 CRC Figure 2: Memory Mapping Notes [1] Maximal size of intermediate result during evaluation of variable. [2] All coefficients are 2's complement format. [3] Fixed values behind A0, A1, and A2 coefficients may change in subsequent production runs. Customer will receive calculation formula with each shipment and must validate these values for any changes. MS4525HRD www.meas-spec.com October 2013 10/22
MS4525HRD (High Resolution Digital) SPI INTERFACE COMMANDS 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 PROM is embedded inside of the PROM read command using the Ad 2, Ad 1 and Ad 0 bits. Bit number Command byte 0 1 2 3 4 5 6 7 hex value Bit name PRM COV - Typ Ad2/ Os2 Os1 Os0 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 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 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 RESET SEQUENCE The Reset sequence shall be sent once after power-on to make sure that the calibration PROM gets loaded into the internal register. It can be also used to reset the device ROM from an unknown condition MS4525HRD www.meas-spec.com October 2013 11/22
MS4525HRD (High Resolution Digital) PROM READ SEQUENCE The read command for PROM shall be executed once after reset by the user to read the content of the calibration PROM and to calculate the calibration coefficients. There are in total 8 addresses resulting in a total memory of 128 bit. Address 0 contains factory data and the setup, addresses 1-6 calibration coefficients and address 7 contains the serial code and CRC. The command sequence is 8 bits long with a 16 bit result which is clocked with the MSB first. MS4525HRD www.meas-spec.com October 2013 13/22
MS4525HRD (High Resolution Digital) APPLICATION CIRCUIT The MS4525HRD is a circuit that can be used in conjunction with a microcontroller. It is designed for low-voltage systems with a supply voltage of 3 V. Figure 17: Typical application circuit with SPI / I 2 C protocol communication Note 1. Place 100nF capacitor between Supply and GND to within 2 cm of sensor. MS4525HRD www.meas-spec.com October 2013 16/22
MS4525HRD (High Resolution Digital) DIMENSIONS MS4525HRD-SSxxxyP MS4525HRD-TPxxxyP MS4525HRD www.meas-spec.com October 2013 20/22
DIMENSIONS ARE IN INCHES [mm]
MS4525HRD (High Resolution Digital) ORDERING INFORMATION MS4525HRD www.meas-spec.com October 2013 22/22