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HCEM010U Datasheet(PDF) 5 Page - Sensortechnics GmbH |
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HCEM010U Datasheet(HTML) 5 Page - Sensortechnics GmbH |
5 / 11 page HCE Series Miniature amplified pressure sensors 5/11 E / 11652 / F www.first-sensor.com www.sensortechnics.com Fig. 2: 3 byte data stream between HCE sensor and master containing the pressure value as a 15 bit information SPI - SERIAL PERIPHERAL INTERFACE Fig. 1: Example of a standard 1 byte SPI data transfer for CPHA=0 and CPOL=0 For further information please refer to First Sensor's SPI bus application note Introduction The HCE is capable to generate a digital output signal. The device runs a cyclic program, which will store a corrected sensor value with 14 bit resolution about every 500 µs within the output registers of the internal ASIC. This cyclic program runs independent from the bus communication. In order to use the pressure sensor for digital signal readout, it should be connected to a SPI Master device. SPI specifies four signals: The clock (CLK) is generated by the master and input to all slaves. MOSI carries data from master to slave. MISO carries data from slave back to master. A slave select line (SS) allows individual selection of a slave device. SPI Modes A pair of parameters called clock polarity (CPOL) and clock phase (CPHA) determine the edges of the clock signal on which the data are driven and sampled. Each of the two parameters has two possible states, which allows for four possible combinations, all of which are incompatible with one another. In general the HCE series supports all combinations of clock phase (CPHA) and polarity (CPOL). By default it is programmed to CPHA = 0 and CPOL = 0, which means that data transmission starts with the rising first clock edge (see Fig 1). Slave select The falling edge of the SS line indicates the beginning of the transfer. Additionally the SS line must not be negated and reasserted between the three bytes to be transmitted. Data operation The MOSI line should always be set to high level. So there is no data transmission from master to slave. Because of internal configuration the slave will answer the first byte with an FFxh. The second and third byte contain the 15 bit pressure information (see Fig. 2). Relevant data Data Byte 2 Data Byte 3 X P14 P13 P12 P11 P10 P9 P8 P7 P6 P5 P4 P3 P2 P1 P0 X X X X X X X X Data Byte 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 MOSI MISO SCK cycle 1 2 3 4 5 6 7 8 SCK (CPOL=0) MOSI MISO SS MSB LSB LSB MSB Sampling |
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