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HV210-SM02-R Datasheet(PDF) 8 Page - Superior Sensors Technology. |
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HV210-SM02-R Datasheet(HTML) 8 Page - Superior Sensors Technology. |
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8 / 17 page ![]() HV Series Differential Low Pressure Sensors www.SuperiorSensors.com 8 DS‐0001G.DOCX The requirement to send the Mode and Rate bytes on each data read cycle is intentional. The purpose is to force the master to send specific data for each communication and prevent inadvertent data from being sent to the sensor. Since a SPI interface will generally re‐circulate data through its shift register, the intention is to prevent the pressure output from the sensor from being re‐circulated back to the sensor and potentially causing unintended corruption of manufacturing data. 10.4 I2C Interface The HV Series is compatible with the I 2C protocol. For detailed information regarding the I2C protocol, please refer to the Philips I2C Bus Specification, Version 2. 10.4.1 I2C Address The I 2C address is set to 0x28 by grounding the SCK line. Other I2C addresses can be established by applying a voltage to the SCK line by use of a resistor divider across the sensor supply voltage. The suggested resistor values and the respective I 2C address are shown in the table to the left. Note: R1 is the lower resister of the divider where R2 is the upper resistor of the divider. 10.4.2 I2C Communications Model The sensor is configured as a slave device and as such, the communicating host must be configured as a master. There are two types of possible data transfers, data transfers from the master transmitter to an addressed sensor (WRITE), and data transfers from an addressed sensor to a master receiver (READ). The master device initiates both types of data transfers and provides the serial clock pulses on SCL. The communications model for I 2C is similar to that of SPI however, since I 2C is a half‐duplex protocol, the transfer of information to and from the sensor is separated into two separate communications. This is in contrast to the SPI interface where the transmitted and received data occurs simultaneously to and from the host. Refer to the figure to the right for the data communication model for the HV Series sensors. User Mode Byte SCK MOSI MISO nSS Pressure Output High Byte User Rate Byte Pressure Output Low Byte SPI Data Diagram R1 (kΩ)R2 (kΩ) Address (decimal) Address (hex) 120 5.6 49 0x31 120 12 48 0x30 120 27 47 0x2F 120 51 46 0x2E 120 100 45 0x2D 56 100 44 0x2C 30 100 43 0x2B 15 100 42 0x2A 5.6 100 41 0x29 0 NoPop 40 0x28 I2C Address Selection Table |
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