CMV2000 datasheet(33/87 Pages) AMSOSRAM

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CMV2000

Functional description

Datasheet

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DS000734

• v8-00 • 2025-Jul-07

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7.2.8

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.

The details of the timing and data format are described in the following points.

7.2.8.1

SPI write

The timing to write data over the SPI interface can be found in Figure 21.

Figure 21: SPI write timing

The data is sampled by the CMV2000 on the rising edge of the SPI_CLK. The SPI_CLK has a

maximum frequency of 48 MHz. The SPI_EN signal has to be high for half a clock period

before the first data bit is sampled. After the last data bit is sent, SPI_EN has to remain high for

1 clock period and SPI_CLK has to receive a final falling edge to complete the write operation.

One write action contains 16 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.

•

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

the address bits. The MSB data is written first.

SPI_EN

SPI_IN

SPI_CLK

’1'

½ CLK

1 CLK

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