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RM3000-f & RM2000-f Sensor Suite User Manual Page 37

6.1.1 Legacy Operation SPI Activity Sequence

The SPI activity sequence is given below for Legacy operation. SPI timing is discussed

in Section 4.4. The Return Byte is 0x9B. If the Return Byte is 0x9A, then the 3D MagIC

is in Standard Mode. Two (2) data bytes will be clocked out for a Legacy measurement.

The Command Byte is discussed below.

Figure 6-1: SPI Activity Sequence Diagram for Legacy Operation

6.1.2 Legacy Command Byte

The command byte to initiate a sensor measurement is defined as follows:

Bit #

Value

PS2

PS1

PS0

AS1

AS0

PS0-PS2: Period Select

Selects the number of sensor circuit oscillation cycles (cycle counts) to be counted

while simultaneously using the internal fixed reference clock to measure the time to

obtain this count.

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 45 46

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Pni RM3000-F Sensor Suite Manuale Utente Pagina 37