SCA3000-D01 datasheet(26/43 Pages) VTI

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SCA3000 Series

VTI Technologies Oy

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www.vti.fi

Doc.Nr. 8257300A.07

Rev.A.07

4.1.3.2

Example of decremented register read

Figure 8 presents a decremented read operation where the content of four output registers is read

by one SPI frame. After normal register addressing and one register content reading, the µC keeps

the CSB line low and continues supplying the SCK pulses. After every 8 SCK pulses, the output

data address is decremented by one and the previous acceleration output register's content is

shifted out without parity bits. The parity bit in Figure 4 is calculated and transferred only for the first

data frame. From the X_LSB register address, the SCA3000 jumps to Z_MSB. Decremented

reading is possible only for registers X_LSB ... Z_MSB.

Figure 8. An example of decremented read operation.

4.1.3.3

Example of ring buffer read

An example of output ring buffer read by one SPI frame (ring buffer data length 8 bits) is presented

in Figure 9. The whole ring buffer read procedure is very similar to decremented read described

above. The output ring buffer is addressed (register name BUF_DATA). The SCA3000 sensor

continues shifting out the ring buffer content as long as µC continues supplying the SCK pulses.

Figure 9. An example of output ring buffer read operation.

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