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CMV12000

Functional Description

Datasheet

• PUBLIC

DS000603

• v6-00 • 2023-Sep-22

│ 24

7.2.7

SPI Programming

Programming the sensor is done by writing the appropriate values to the on-board registers. These

registers can be written over a simple serial interface (SPI). The details of the timing and data format

are described below. The data written to the programming registers can also be read out over this

same SPI interface.

SPI I/O’s are pulled low when not used/enabled.

SPI Write

The timing to write data over the SPI interface can be found below.

Figure 15:

SPI Write

The data is sampled by the device on the rising edge of the SPI_CLK and read-in at the last falling

SPI_CLK edge. The SPI_CLK has a maximum frequency of 30 MHz. The SPI_EN signal has to be

high for half a clock period before the first data bit is sampled. SPI_EN has to remain high for one

clock period after the last data bit is sampled.

One write action contains 24 data bits:

●

One control bit: First bit to be sent, indicates whether a read (‘0’) or write (‘1’) will occur on the

SPI interface.

●

7 address bits: These bits form the address of the programming register that needs to be

written. The address is sent MSB first.

●

16 data bits: These bits form the actual data that will be written in the register selected with the

address bits. The data is written MSB first.

When several sensor registers need to be written, the timing above can be repeated with SPI_EN

remaining high all the time. See the figure below for an example of 2 registers being written.

Figure 16:

SPI Write of Multiple Registers

SPI_EN

SPI_IN

SPI_CLK

’1'

D15

D14

D13

...

½ CLK

1 CLK

...

SPI_EN

SPI_IN

SPI_CLK

’1'

D15

D14

D13

...

’1'

D15

D14

D13

...

½ CLK

1 CLK

...

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