VS6624P0LP datasheet(45/100 Pages) STMICROELECTRONICS

45 / 100 page

VS6624

Rev 1

45/100

The VS6624 I²C write address is 0x20.

To read or write to registers other than those in

Low level control registers section the device

must be switched on, this is done by writing 0x02 to 0xC003. Information on initial power up

for the device can be found in the

Section 9: Getting started.

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

BYTE

Single field register 8 bit parameter

UINT_16

Multiple field registers - 16 bit parameter

FLAG_e

Bit 0 of register must be set/cleared

CODED

Coded register - function depends on value written

FLOAT

Float Value

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