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SCA3000-E05-10 Datasheet(PDF) 7 Page - VTI technologies |
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SCA3000-E05-10 Datasheet(HTML) 7 Page - VTI technologies |
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7 / 43 page  SCA3000 Series VTI Technologies Oy 7/ 43 www.vti.fi Doc.Nr. 8257300A.07 Rev.A.07 1.2.7 Interrupt The SCA3000 has a dedicated output pin (INT) to be used as the interrupt for the master controller. Interrupt conditions can be activated and deactivated via the SPI or I 2C bus. Once the interrupt has happened, the interrupt source can be read out from the corresponding status register. 1.2.8 Temperature output Some SCA3000 products provide 9-bit temperature information via the serial interface. See Table 1 for detailed product information. 1.2.9 Output ring buffer In those applications where real time acceleration information is not needed, the ring buffer memory can be used to buffer acceleration data. This will release µC resources for other tasks or for example, to offer a power saving mode while SCA3000 samples acceleration data into its buffer memory. Acceleration data is sampled at a constant sample rate by the sensor. The buffer is a FIFO type (First In First Out) where the oldest data is shifted out first. It has separate read and write address pointers, so it can be read and written simultaneously. If the buffer overflows, the oldest data is lost and the new data replaces the oldest samples. Ring buffer logic can be configured to give an interrupt when the buffer is ½ or ¾ full. The entire ring buffer content can be read by one read sequence. 2 Reset and power up, Operation Modes, HW functions and Clock 2.1 Reset and power up The SCA3000 has an external active low reset pin. Power supplies must be within the specified range before the reset can be released. After releasing the reset, the SCA3000 will read configuration and calibration data from the non- volatile memory to volatile registers. Then the SCA3000 will make a check sum calculation to the read memory content. The STATUS register's CSME-bit="0" shows successful memory read operation. 2.2 Measurement Mode 2.2.1 Description The SCA3000 enters the measurement mode by default after power-on and the CV-converter will start to feed data to the signal channel (Figure 1). Data will be reliable in the output registers after the product specific turn-on time. The SCA3000 can also be set to optional measurement modes. See component specific data sheets for detailed functional parameters in all measurement modes. All available measurement modes for the SCA3000 are described in Table 2 below. |
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