VL6524 datasheet(42/70 Pages) STMICROELECTRONICS

42 / 70 page

VL6524/VS6524

42/70

The VL6524/VS6524 I²C write address is 0x20.

All I²C locations contain an 8-bit byte. However, certain parameters require 16 bits to

represent them and are therefore stored in more than 1 location.

Note:

For all 16 bit parameters the MSB register must be written before the LSB register.

The data stored in each location can be interpreted in different ways as shown below.

Table 6.

Float number format

Float 900 is used in ST co-processors to represent floating point numbers in 2 bytes of data.

It conforms to the following structure:

Bit[15] = Sign bit (1 represents negative)

Bit[14:9] = 6 bits of exponent, biased at decimal 31

Bit[8:0] = 9 bits of mantissa

To convert a floating point number to Float 900, use the following procedure:

●

represent the number as a binary floating point number. Normalize the mantissa and

calculate the exponent to give a binary scientific representation of 1.xxxxxxxxx * 2^y.

●

The x symbols should represent 9 binary digits of the mantissa, round or pad with zeros

to achieve 9 digits in total. Remove the leading 1 from the mantissa as it is redundant.

●

To calculate the y value Bias the exponent by adding to 31 decimal then converting to

binary.

●

The data can then be placed in the structure above.

Table 6.

Data type

Data Type

Description

Integer parameter.

Multiple field registers - 16 bit parameter

Bit field register - individual bits must be set/cleared

Coded register - function depends on value written

Float Value

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