Texas Instruments bq35100 - Floating Point Conversion

val < 0
mod _val = val
False
True
mod_val = val x (-1)
tmpVal = mod _val
False
True
byte2 = tmpVal LHS* of decimal
tmpVal = 2
8
× (tmpVal ± byte2)
False
byte1 = tmpVal LHS* of decimal
True
tmpVal = 2
8
× (tmpVal ± byte1)
decrement exp by 1
byte0 = tmpVal LHS* of decimal
False
True
True
Byte 2 OR with 0x80
False
True
False
rawData[byte0] = exp + 128
rawData[byte1] = byte2
rawData[byte2] = byte1
rawData[byte3] = byte0
exp < í128
End
val = read in value
Create integer, set to 0
exp = 0
tmpVal = tmpVal × (1+2
±25
)
tmpVal < 0.5
tmpVal < 0.5
multiply tmpVal by 2
tmpVal > = 1.0
tmpVal > = 1.0
divide tmpVal by 2
increment exp by 1
exp > 127
exp = 127
Write rawData [0-3] to
corresponding DF location
val < 0
tmpVal = 2
(8 ± exp)
× mod_val ± 128
exp í128
Floating Point Conversion www.ti.com
18
SLUUBH1C–August 2016–Revised March 2018
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Factory Calibration
3.10 Floating Point Conversion
This section details how to convert the floating point CC Gain and CC Delta values to the format
recognized by the gauge.
* LHS is an abbreviation for Left-Hand Side. This refers to truncating the floating point value by removing anything to
the right of the decimal point.
Figure 3-8. Floating Point Conversion Flow