M3021-000005-10KPG

MSP300 Pressure Transducer SPECIFICATIONS      Analog Output or 14-Bit Digital Pressure with 11-Bit Temperature Output One Piece Stainless Steel Construction Low Cost 17-4PH or 316L Stainless Steel Customizable The MSP300 pressure transducer from the Microfused line of TE is suitable for measurement of liquid or gas pressure, even for difficult media such as contaminated water, steam, and mildly corrosive fluids. FEATURES      One Piece Stainless Steel Construction Ranges up to 15kpsi Digital Pressure and Temperature Output or Analog mV/Amplified Output ±1 %Span Accuracy UL Certification (analog only) APPLICATIONS         Pumps and Compressors Hydraulic/Pneumatic Systems Automotive Test Systems Energy and Water Management Medical Gas Pressure Leak Detection Remote Measuring Systems General Pressure Measurements SENSOR SOLUTIONS ///MSP300 The transducer pressure cavity is machined from a solid piece of 17-4PH or 316L stainless steel. The standard version includes a 1/4 NPT pipe thread allowing a leak-proof, all metal sealed system. With excellent durability, there are no welds or organics exposed to the pressure media. TE’s proprietary Microfused technology, derived from demanding aerospace applications, employs micromachined silicon piezoresistive strain gages fused with high temperature glass to a stainless steel diaphragm. This approach achieves media compatibility simply and elegantly while providing an exceptionally stable sensor without the PN junctions of conventional micromachined sensors. This product is geared towards industrial and commercial OEMs for small to high volume applications. Standard configurations are suitable for many applications. Please contact factory for your customization needs. 04/2020 Page 1 MSP300 Pressure Transducer STANDARD RANGES Range (psi) Range (Bar) 0 to 100 0 to 007 0 to 200 0 to 010 0 to 300 0 to 020 0 to 500 0 to 035 0 to 01k 0 to 070 0 to 03k 0 to 200 0 to 05k 0 to 350 0 to 10k 0 to 700 0 to 15k 0 to 01k ALL INTERMEDIATE RANGES ARE STANDARD Gage/Compound          PERFORMANCE SPECIFICATIONS (ANALOG) Supply Voltage: 5.0V, Ambient Temperature: 25°C (unless otherwise specified) PARAMETERS MIN TYP Pressure Accuracy (RSS combined Non Linearity, Hysteresis & Repeatability) MAX UNITS NOTES 1 %Span BFSL @ 25°C -1 Pressure Cycles 1.00E+6 0~F.S. Cycles Proof Pressure 2X Rated Burst Pressure 5X Isolation, Body to Any Lead 50 Long Term Stability (1 year) -0.25 0.25 %Span Zero Thermal Error -2.0 2.0 %Span Over comp. temp Span Thermal Error -2.0 2.0 %Span Over comp. temp Zero Offset (mV Output) -3.0 3.0 %Span @ 25°C Zero Offset (V Output) -2.0 2.0 %Span @ 25°C Span Tolerance -2.0 2.0 %Span @ 25°C 0 55 °C Operating Temperature -20 +85 °C Storage Temperature -40 +85 Compensated Temperature 20000PSI Rated Whichever is less MΩ @ 250VDC °C Load Resistance (RL, mV Output) 1 MΩ Load Resistance (RL, V Output) 5 KΩ Response Time 1 ms Shock 50g, 11 msec Half Sine Shock per MIL-STD-202G, Method 213B, Condition A Vibration ±20g, MIL-STD-810C, Procedure 514.2-2, Curve L Wetted Material (except elastomer seal) 17-4PH or 316L Stainless Steel For custom configurations, consult factory. SENSOR SOLUTIONS ///MSP300 10/2021 Page 2 MSP300 Pressure Transducer PERFORMANCE SPECIFICATIONS (DIGITAL) Supply Voltage: 3.3V, Ambient Temperature: 25°C (unless otherwise specified) PARAMETERS MIN TYP Supply Voltage Output at Zero Pressure Output at FS Pressure MAX UNITS 5.0 VDC 2.7 720 1000 1280 Count 14720 15000 15280 Count 3.5 mA Current Consumption Current Consumption (Sleep mode) 5 Proof Pressure 2X Burst Pressure 5X Isolation, Body to Any Lead Pressure Cycles Pressure Accuracy (RSS combined Non Linearity, Hysteresis & Repeatability) Temperature Accuracy Zero Thermal Error NOTES uA Rated 20000PSI Rated Whichever is less 50 MΩ @ 250VDC 1.00E+6 0~F.S. Cycles -1 1 %Span BFSL @ 25°C -3 3 °C 1 -2.0 2.0 %Span Over comp. temp Span Thermal Error -2.0 2.0 %Span Over comp. temp Long Term Stability (1 year) -0.25 0.25 %Span @ 25°C Compensated Temperature 0 55 °C 512 Compensated Temperature Output 1075 Count Response time 3 ms @ 4MHz Non-sleep mode, 2 Response time 8.4 ms @ 4MHz Sleep mode, 2 -20 +85 °C -40 +85 °C Operating Temperature Storage Temperature Shock 50g, 11 msec Half Sine Shock per MIL-STD-202G, Method 213B, Condition A Vibration ±20g, MIL-STD-810C, Procedure 514.2-2, Curve L Wetted Material (except elastomer seal) 17-4PH or 316L Stainless Steel For custom configurations, consult factory. Notes 1. Reflect pressure port diaphragm temperature over the compensated temperature range. 2. Response time is from power on to reading measurement data. SENSOR SOLUTIONS ///MSP300 10/2021 Page 3 MSP300 Pressure Transducer DIMENSIONS CODE 2 4 PORT 1/4-19 BSPP DIM C 0.453[11.50] CODE CONNECTION TYPE 1 CABLE 2 FT 2 CABLE 4 FT 3 CABLE 10 FT 7/16-20 UNF-A MALE SAE J514 STRAIGHT THREAD ORING BUNA-N 70SH-904, ID8.92mm x W1.83mm 0.435[11.05] M CABLE 1 M 5 1/4-18 NPT 0.596[15.14] N CABLE 2 M 6 1/8-27 NPT 0.475[12.06] P E 1/4-19 BSPT 0.50[12.70] R F 1/4-19 BSPP FEMALE 0.70[17.78] K 1/8-27 NPT FEMALE 0.70[17.78] P 7/16-20 UNF-2A FEMALE SAE J514 STRAIGHT THREAD WITH INTEGRAL VALVE DEPRESSOR 0.689[17.50] Q M10 x 1.0 mm 0.42[10.67] S M12 x 1.5 mm 0.53[13.46] U G/14 DIN 3852 FORM E GASKET DIN3869-14 NBR 0.519[13.18] W M20 x 1.5 mm 0.702[17.83] CABLE 5 M (ANALOG ONLY) CABLE 10 M (ANALOG ONLY) NOTE: FOR PRESSURE PORT CODE ‘W’, TYPICAL HEX DIMENSION WILL BE 1.260[32.00] OUTPUT (ANALOG) Code 1 2 3 4 5 Output 0 – 50mV 0 – 100mV 0.5 – 4.5V 1 – 5V 4 – 20mA Supply 5V 5V 5 ± 0.25V 10 – 30V 9 – 30V Ratiometricity Yes Yes Yes No No Red +Supply +Supply +Supply +Supply +Supply Black -Supply -Supply Common Common -Supply Green +Output +Output Cut Off Cut Off Cut Off White -Output -Output +Output +Output Cut Off Black -Supply -Supply Green SCL SCLK White SDA MISO Yellow -SS OUTPUT (DIGITAL) Code J S Output I2C SPI SENSOR SOLUTIONS ///MSP300 Supply 2.7 – 5.0V 2.7 – 5.0V Red +Supply +Supply 10/2021 Page 4 MSP300 Pressure Transducer PRESSURE OUTPUT SENSOR SOLUTIONS ///MSP300 10/2021 Page 5 MSP300 Pressure Transducer TEMPERATURE OUTPUT SENSOR SOLUTIONS ///MSP300 10/2021 Page 6 MSP300 Pressure Transducer ORDERING INFORMATION M30 3 3 – 1 0 0 0 0 K – 350B G Output Code 1 2 3 4 5 J* S* Output Signal 0-50mV 0-100mV 0.5-4.5V 1-5V 4-20mA I2C SPI Supply Voltage 5V 5V 5±0.25V 10-30V 9-30V 2.7-5.0V 2.7-5.0V Pressure Reference G Gauge C Compound Pressure Ranges Psi Bar Std Std 100P 007B 200P 010B 300P 020B 500P 035B 01KP 070B 03KP 200B 05KP 350B 10KP 700B 15KP 01KB *Digital Options Cable Length 1 2 feet 2 4 feet 3 10 feet M 1 meter N 2 meter 5 meter (Analog only) 10 meter R (Analog only) Port Material 0 17-4PH Stainless Steel 1 316L Stainless Steel P All Intermediate Ranges are Standard Pressure Port Code Port Type 2 1/4-19 BSPP 7/16-20 UNF-2A Male SAE J514 Straight Thread O-Ring Boss O-Ring 4 BUNA-N 70SH-904 ID8.92mm X W1.83mm 5 1/4-18 NPT 6 1/8-27 NPT E 1/4-19 BSPT F 1/4-19 BSPP Female K 1/8-27 NPT Female 7/16-20 UNF-2A Female SAE J514 P Straight Thread w/ Integral Valve Depressor Q M10x1.0mm S M12x1.5mm G1/4 DIN 3852 Form E Gasket U DIN3869-14 NBR W M20 x 1.5mm Cleaning 0 No Selection 1 Oxygen Clean B40.1, Level IV Sleep (Digital Only) 0 Non-sleep Mode 1 Sleep Mode Code Address for I2C (Digital Only) 0 0X28H 1 0x36H 2 0x46H 3 0x48H 4 0x51H SPI Default Code ‘0’ SENSOR SOLUTIONS ///MSP300 10/2021 Dim C 0.453[11.50] 0.435[11.05] 0.596[15.14] 0.475[12.06] 0.50[12.70] 0.70[17.78] 0.70[17.78] 0.689[17.50] 0.420[10.67] 0.53[13.90] 0.547[13.90] 0.702[17.83] Page 7 MSP300 Pressure Transducer OLD ORDERING INFORMATION MSP-300-100 – P – 5 – P – 1 Cable Length 1 2 feet Pressure Ranges Psi Bar Std Std 100 007 200 010 300 020 500 035 01K 070 03K 200 05K 350 10K 700 15K 01K 2 4 feet 3 10 feet M 1 meter N 2 meter P 5 meter R 10 meter All Intermediate Ranges are Standard Code B Pressure Unit P Psi B Bar D Output Code 1 2 3 4 5 Output Signal 0-50mV 0-100mV 0.5-4.5V 1-5V 4-20mA N A E F H Supply Voltage 5V 5V 5±0.25V 10-30V 9-30V P Q S C W Port Type 1/4-19 BSPP 7/16-20 UNF-2A Male SAE J514 Straight Thread O-Ring Boss O-Ring BUNA-N 70SH-904 ID8.92mm X W1.83mm 1/4-18 NPT 1/8-27 NPT 1/4-19 BSPT 1/4-19 BSPP Female 1/8-27 NPT Female 7/16-20 UNF-2A Female SAE J514 Straight Thread w/ Integral Valve Depressor M10x1.0mm M12x1.5mm G1/4 DIN 3852 Form E Gasket DIN3869-14 NBR M20 x 1.5mm NORTH AMERICA EUROPE ASIA Measurement Specialties, Inc., a TE Connectivity Company Phone: 800-522-6752 Email: customercare.frmt@te.com Measurement Specialties (Europe), Ltd., a TE Connectivity Company Phone: +31 73 624 6999 Email: customercare.lcsb@te.com Measurement Specialties (China), Ltd., a TE Connectivity Company Phone: 0400-820-6015 Email: customercare.shzn@te.com 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 and schematics which are intended for illustration purposes only, is believed 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 case 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 SENSOR SOLUTIONS ///MSP300 All Rights Reserved. 10/2021 Page 8 MSP300 Pressure Transducer INTERFACING TO TE DIGITAL PRESSURE MODULES The TE series of digital pressure sensors uses the latest CMOS sensor conditioning circuitry (SSC) to create a low cost, high performance digital output pressure (14-bit) and temperature (11-bit) sensor designed to meet the strictest requirements from OEM customers. The MS45x5DO, 85BSD, 85FBSD, 86BSD,154BSD, MSP100(DO) and MSP300(DO) , M3200(DO), FX29(DO) and FS30(DO)are the latest offering from TE to offer digital communication to pressure sensor OEMs. I2C AND SPI INTERFACE SPECIFICATIONS 1. I2C Interface Specification The I2C interface is a simple 8-bit protocol using a serial data line (SDA) and a serial clock line (SCL) where each device connected to the bus is software addressable by a unique address. For detailed specifications of the I 2C protocol, see The I2C Bus Specification, Version 2.1, January 2000. . I te face Co ectio -Exte al Bi-directional bus lines are implemented by the devices (master and slave) using open-drain output stages and a pull-up resistor connected to the positive supply voltage. The recommended pull-up resistor value depends on the system setup (capacitance of the circuit or cable and bus clock frequency). In most cases, 4.7kΩ is a reasonable choice. The capacitive loads on SDA and SCL line have to be the same. It is important to avoid asymmetric capacitive loads. . I C Add ess The I2C address consists of a 7-digit binary value. The factory setting for the I2C slave address is 0x28, 0x36 or 0x46 depending on the interface type selected from the ordering information. The address is always followed by a write bit (0) or read bit (1). The default hexadecimal I2C header for read access to the sensor is therefore 0x51, 0x6D, 0x8D respectively, based on the ordering information. SENSOR SOLUTIONS ///MSP300 10/2021 Page 9 MSP300 Pressure Transducer . INT/SS Pi When programmed as an I2C device, the INT/SS pin operates as an interrupt. The INT/SS pin rises when new output data is ready and falls when the next I2C communication occurs. . T a sfe Se ue ces Transmission START Condition (S): The START condition is a unique situation on the bus created by the master, indicating to the slaves the beginning of a transmission sequence (the bus is considered busy after a START). 2 I C Transmission Start Condition SDA SCL START condition A HIGH to LOW transition on the SDA line while SCL is HIGH Transmission STOP Condition (P): The STOP condition is a unique situation on the bus created by the master, indicating to the slaves the end of a transmission sequence (the bus is considered free after a STOP). 2 I C Transmission Stop Condition SDA SCL STOP condition A LOW to HIGH transition on the SDA line while SCL is HIGH Acknowledge (ACK) / Not Acknowledge (NACK): Each byte (8 bits) transmitted over the I2C bus is followed by an acknowledge condition from the receiver. This means that after the master pulls SCL low to complete the transmission of the 8th bit, SDA will be pulled low by the receiver during the 9th bit time. If after transmission of the 8th bit the receiver does not pull the SDA line low, this is considered to be a NACK condition. If an ACK is missing during a slave to master transmission, the slave aborts the transmission and goes into idle mode. SENSOR SOLUTIONS ///MSP300 10/2021 Page 10 MSP300 Pressure Transducer I2 C ACKNOWLEDGE / NOT ACKNOWLEDGE Each byte is followed by an acknowledge or a not acknowledge, generated by the receiver 1.5 Data Transfer Format Data is transferred in byte packets in the I2C protocol, which means in 8-bit frames. Each byte is followed by an acknowledge bit. Data is transferred with the most significant bit (MSB) first. A data transfer sequence is initiated by the master generating the Start condition (S) and sending a header byte. The I 2C header consists of the 7-bit I2C device address and the data direction bit (R/_W). The value of the R/_W bit in the header determines the data direction for the rest of the data transfer sequence. If R/_W = 0 (WRITE), the direction remains master-to-slave, while if R/_W = 1 (READ), the direction changes to slave-to-master after the header byte. 1.6 Command Set and Data Transfer Sequences The I2C master command starts with the 7-bit slave address with the 8th bit = 1 (READ). The sensor acts as the slave and sends an acknowledge (ACK) indicating success. The sensor has four I2C read commands: Read_MR, Read_DF2, Read_DF3, and Read_DF4.Figure 1.6 shows the structure of the measurement packet of the four I 2C read commands, which are explained in sections 1.6.1. SENSOR SOLUTIONS ///MSP300 10/2021 Page 11 MSP300 Pressure Transducer .6. Figu e .6 – I C Measu e e t Packet ReadsI C Read_DF Data Fetch For Data Fetch commands, the number of data bytes returned by the sensor, is determined when the master sends the NACK and stop condition. For the Read_DF3 data fetch command (Data Fetch 3 Bytes; see example 3 in Figure 1.6), the sensor returns three bytes in response to the master sending the slave address and the READ bit (1): two bytes of bridge data with the two status bits as the MSBs and then 1 byte of temperature data (8-bit accuracy). After receiving the required number of data bytes, the master sends the NACK and stop condition to terminate the read operation. For the Read_DF4 command, the master delays sending the NACK and continues reading an additional final byte to acquire the full corrected 11-bit temperature measurement. In this case, the last 5 bits of the final byte of the packet are undetermined and should be masked off in the application. The Read_DF2 command is used if corrected temperature is not required. The master terminates the READ operation after the two bytes of bridge data (see example 2 in Figure 1.6). The two status bits (Bit 15 and Bit 14) give an indication of stale or valid data depending on their value. A returned value of 00 indicate “normal operation and a good data packet” while a returned value of 10 indicates “stale data that has been already fetched”. See section 1.7 for additional details. Users that use “status bit” polling should select a frequency slower than 20% more than the update time. 1.7 Status Bits and Diagnostic Features The table below summarizes the status bits conditions indicated by the 2 MSBs (Bit (15:14) of I 2C data packet, S(1:0) of SPI data packet of the bridge high byte data. SENSOR SOLUTIONS ///MSP300 10/2021 Page 12 MSP300 Pressure Transducer Table 1: Status Bits Encoding Status Bits (2 MSB of Output Data Packet) Definition Normal Operation. Good Data Packet 00 Reserved 01 10 Stale Data. Data has been fetched since last measurement cycle. Fault Detected 11 The SSC is has on board diagnostic features to ensure robust system operation in the most “mission-critical” applications. A status bit value of “11” indicates a fault condition in the SSC or sensing element. All diagnostics are detected in the next measurement cycle and reported in the subsequent data fetch. Once a diagnostic is reported, the diagnostic status bits will not change unless both the cause of the diagnostic is fixed and a power-on-reset is performed. 1.8 I2C Protocol Differences There are three differences in the described above protocol compared with original I 2C protocol:    Sending a start-stop condition without any transitions on the SCL line (no clock pulses in between) creates a communication error for the next communication, even if the next start condition is correct and the clock pulse is applied. An additional start condition must be sent, which results in restoration of proper communication. The restart condition – a falling SDA edge during data transmission when the SCL clock line is still high – creates the same situation. The next communication fails, and an additional start condition must be sent for correct communication. A falling SDA edge is not allowed between the start condition and the first rising SCL edge. If using an I 2C address with the first bit 0, SDA must be held down from the start condition through the first bit. 2. SPI Interface Specification SPI is a general-purpose synchronous serial interface. During an SPI transfer, transmit and receive data is simultaneously shifted out and in serially. A serial clock line synchronizes the shifting and sampling of the information on two serial data lines. SPI devices communicate using a master-slave relationship. Due to its lack of built-in device addressing, SPI requires more effort and more hardware resources than I2C when more than one slave is involved. But SPI tends to be simpler and more efficient than I2C in point-to-point (single master, single slave) applications for the very same reason; the lack of device addressing means less overhead. The SPI interface is programmed for falling-edge MISO change. SENSOR SOLUTIONS ///MSP300 10/2021 Page 13 MSP300 Pressure Transducer . SPI Read_DF Data Fetch The SPI interface will have data change after the falling edge of SCLK. The master should sample MISO on the rise of SCLK. The entire output packet is 4 bytes (32 bits). The high bridge data byte comes first, followed by the low bridge data byte. Then 11 bits of corrected temperature (T[10:0]) are sent: first the T[10:3]byte and then the {T[2:0],xxxxx} byte. The last 5 bits of the final byte are undetermined and should be masked off in the application. If the user only requires the corrected bridge value, the read can be terminated after the 2nd byte. If the corrected temperature is also required but only at an 8-bit resolution, the read can be terminated after the 3rd byte is read. Packet = [ {S(1:0),B(13:8)},{B(7:0)},{T(10:3)},{T(2:0),xxxxx}] Where S(1:0) = Status bits of packet (normal, command, busy, diagnostic) 6 bits of 14-bit bridge data. B(13:8) = Upper B(7:0) = Lower 8 bits of 14-bit bridge data. T(10:3) = Corrected temperature data (if application does not require corrected temperature, terminate read early) T(2:0),xxxxx =. Remaining bits of corrected temperature data for full 11-bit resolution HiZ = High impedance Figure 2.2 – SPI Output Packet with Falling Edge SPI_Polarity TIMING DIAGRAMS I2C INTERFACE PARAMETERS PARAMETERS SYMBOL SCLK CLOCK FREQUENCY fSCL START CONDITION HOLD TIME RELATIVE TO SCL EDGE tHDSTA MINIMUM SCL CLOCK LOW WIDTH 1 tLOW tHIGH MINIMUM SCL CLOCK HIGH WIDTH 1 START CONDITION SETUP TIME RELATIVE TO SCL EDGE tSUSTA DATA HOLD TIME ON SDA RELATIVE TO SCL EDGE tHDDAT DATA SETUP TIME ON SDA RELATIVE TO SCL EDGE tSUDAT STOP CONDITION SETUP TIME ON SCL tSUSTO BUS FREE TIME BETWEEN STOP AND START CONDITION 1COMBINED MIN 100 TYP MAX UNITS 400 KHz 0.1 uS 0.6 uS 0.6 uS 0.1 uS 0 uS 0.1 uS 0.1 uS 2 uS tBUS LOW AND HIGH WIDTHS MUST EQUAL OR EXCEED MINIMUM SCL PERIOD. SENSOR SOLUTIONS ///MSP300 10/2021 Page 14 MSP300 Pressure Transducer I C Ti i g Diag a PARAMETERS SYMBOL SCLK CLOCK FREQUENCY fSCL SS DROP TO FIRST CLOCK EDGE 1 tHDSS MIN 50 TYP MAX UNITS 800 KHz 2.5 uS MINIMUM SCL CLOCK LOW WIDTH 1 tLOW 0.6 uS MINIMUM SCL CLOCK HIGH WIDTH 1 tHIGH 0.6 uS CLOCK EDGE TO DATA TRANSITION tCLKD 0 RISE OF SS RELATIVE TO LAST CLOCK EDGE tSUSS 0.1 uS BUS FREE TIME BETWEEN RISE AND FALL OF SS tBUS 2 uS 0.1 uS COMBINED LOW AND HIGH WIDTHS MUST EQUAL OR EXCEED MINIMUM SCLK PERIOD. C Code Example For FX29 SENSOR SOLUTIONS ///MSP300 10/2021 Page 15 MSP300 Pressure Transducer //Note: The C code is use for communication with FX29K0-040B-0100-L using STM32L031. // This routine is applicable to other models mentioned in this document. #include "main.h" #include "stm32l0xx_hal.h" #include "stdlib.h" #include "delay.h" #include "config.h" u8 temp[7]; float Tscope,Pscope,Tdisplay,Pdisplay; float Lmax=100,Lmin=0；//Span 100L，Zero 0L, Span should be defined by the sensor pressure range of customer used. 100 means pressure range of 100L u32 Pvalue,Tvalue,Tspan,Pspan; u16 P1=1000,P2=15000; void SDA_IN2(void); void SDA_OUT2(void); void IIC_Start2(void); void IIC_Stop2(void); unsigned char IIC_Wait_Ack2(void); void IIC_Ack2(void); void IIC_NAck2(void); void IIC_Send_Byte(unsigned char txd); unsigned char IIC_Read_Byte(unsigned char ack); float Get_I2CValue(void); void SDA_IN2() { GPIO_InitTypeDef GPIO_InitStructure; GPIO_InitStructure.Pin = SDA2_Pin; GPIO_InitStructure.Mode = GPIO_MODE_INPUT; GPIO_InitStructure.Pull = GPIO_NOPULL; //GPIO_InitStructure.Alternate = GPIO_PuPd_UP; GPIO_InitStructure.Speed = GPIO_SPEED_FREQ_LOW; HAL_GPIO_Init(SDA2_GPIO_Port, &GPIO_InitStructure); } void SDA_OUT2() { GPIO_InitTypeDef GPIO_InitStructure; GPIO_InitStructure.Pin = SDA2_Pin; SENSOR SOLUTIONS ///MSP300 10/2021 Page 16 MSP300 Pressure Transducer GPIO_InitStructure.Mode = GPIO_MODE_OUTPUT_PP; GPIO_InitStructure.Pull = GPIO_NOPULL; GPIO_InitStructure.Speed = GPIO_SPEED_FREQ_LOW; HAL_GPIO_Init(SDA2_GPIO_Port, &GPIO_InitStructure); } void IIC_Start2() { SDA_OUT2(); //sda??? Sensor_SDA_ON ; Sensor_SCL_ON; delay_us(4); Sensor_SDA_OFF;//START:when CLK is high,DATA change form high to low delay_us(4); Sensor_SCL_OFF;//??I2C??,????????? } void IIC_Stop2() { SDA_OUT2();//sda??? Sensor_SCL_OFF; Sensor_SDA_OFF;//STOP:when CLK is high DATA change form low to high delay_us(4); Sensor_SCL_ON; Sensor_SDA_ON ;//??I2C?????? delay_us(4); } unsigned char IIC_Wait_Ack2() { unsigned char ucErrTime=0; SDA_IN2(); //SDA????? Sensor_SDA_ON ;delay_us(1); Sensor_SCL_ON;delay_us(1); while(READ_Sensor_SDA) { ucErrTime++; if(ucErrTime>250) { IIC_Stop2(); return 1; } } SENSOR SOLUTIONS ///MSP300 10/2021 Page 17 MSP300 Pressure Transducer Sensor_SCL_OFF;//????0 return 0; } void IIC_Ack2() { Sensor_SCL_OFF; SDA_OUT2(); Sensor_SDA_OFF; delay_us(2); Sensor_SCL_ON; delay_us(2); Sensor_SCL_OFF; } void IIC_NAck2() { Sensor_SCL_OFF; SDA_OUT2(); Sensor_SDA_ON; delay_us(2); Sensor_SCL_ON; delay_us(2); Sensor_SCL_OFF; } void IIC_Send_Byte(unsigned char txd) { unsigned char t; SDA_OUT2(); Sensor_SCL_OFF;//?????????? for(t=0;t