VS6624Q0KP STMicroelectronics, VS6624Q0KP Datasheet - Page 46
VS6624Q0KP
Manufacturer Part Number
VS6624Q0KP
Description
Display Modules & Development Tools CAMERA MODULE SINGLE CHIP 1.3MEGA
Manufacturer
STMicroelectronics
Datasheet
1.VS6624Q0KP.pdf
(106 pages)
Specifications of VS6624Q0KP
Description/function
Camera Module
Interface Type
Two-Wire Serial
Data Bus Width
8 bit
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Example
Convert -0.41 to Float 900
Convert the fraction into binary by successive multiplication by 2 and removal of integer
component
This gives us -0.0110100011110.
We then normalize by moving the decimal point to give - 1.10100011110 * 2^-2.
The mantissa is rounded and the leading zero removed to give 101001000.
We add the exponent to the bias of 31 that gives us 29 or 11101.
A leading zero is added to give 6 bits 011101.
The sign bit is set at 1 as the number is negative.
This gives us 1011 1011 0100 1000 as our Float 900 representation or BB48 in hex.
To convert the encoded representation back to a decimal floating point, we can use the
following formula.
Real is = (-1)^sign * ((512+mantissae)>> 9) * 2^(exp-31)
Thus to convert BB48 back to decimal, the following procedure is followed:
Note that >>9 right shift is equal to division by 2^9.
Sign = 1
Exponent = 11101 (29 decimal)
Mantissa = 101001000 (328 decimal)
This gives us:
real = (-1)^1 * ((512+328)/2^9) * 2^(29-31)
real = -1 * (840/512) * 2^(-2)
real = -1 * 1.640625 * 0.25
real = -0.41015625
When compared to the original -0.41, we see that some rounding errors have been
introduced.
0.41 * 2 = 0.82
0.82 * 2 = 1.64
0.64 * 2 = 1.28
0.28 * 2 = 0.56
0.56 * 2 = 1.12
0.12 * 2 = 0.24
0.24 * 2 = 0.48
0.48 * 2 = 0.96
0.96 * 2 = 1.92
0.92 * 2 = 1.84
0.84 * 2 = 1.68
0.68 * 2 = 1.36
0.36 * 2 = 0.72
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VL6624/VS6624
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