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LDES250BF3S Datasheet(PDF) 8 Page - Sensortechnics GmbH |
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LDES250BF3S Datasheet(HTML) 8 Page - Sensortechnics GmbH |
8 / 13 page E / 11815 / E 8/13 LDE Series Digital low differential pressure sensors www.first-sensor.com www.sensortechnics.com Fig. 3: Resistors at both ends of the SPI lines SPI - SERIAL PERIPHERAL INTERFACE Introduction The LDE serial interface is a high-speed synchronous data input and output communication port. The serial interface operates using a standard 4-wire SPI bus. The LDE device runs in SPI mode 0, which requires the clock line SCLK to idle low (CPOL = 0), and for data to be sampled on the leading clock edge (CPHA = 0). Figure 5 illustrates this mode of operation. Care should be taken to ensure that the sensor is properly connected to the master microcontroller. Refer to the manufacturer's datasheet for more information regarding physical connections. Application circuit The use of pull-up resistors is generally unnecessary for SPI as most master devices are configured for push-pull mode. If pull-up resistors are required for use with 3 V LDE devices, however, they should be greater than 50 k Ω. Note: It is important to adhere to the communication protocol in order to avoid damage to the sensor. There are, however, some cases where it may be helpful to use 33 Ω series resistors at both ends of the SPI lines, as shown in Figure 3. Signal quality may be further improved by the addition of a buffer as shown in Figure 4. These cases include multiple slave devices on the same bus segment, using a master device with limited driving capability and long SPI bus lines. If these series resistors are used, they must be physically placed as close as possible to the pins of the master and slave devices. Signal control The serial interface is enabled by asserting /CS low. The serial input clock, SCLK, is gated internally to begin accepting the input data at MOSI, or sending the output data on MISO. When /CS rises, the data clocked into MOSI is loaded into an internal register. Fig. 4: Addition of a buffer SCLK MOSI MISO /CS SCLK MOSI MISO /CS Sensor 33 33 33 33 33 33 33 33 SCLK MOSI MISO /CS SCLK MOSI MISO /CS Sensor 33 33 33 33 33 33 33 33 33 33 33 33 /OE /OE /OE /OE |
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