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PAC1921 датащи(PDF) 36 Page - Microchip Technology

номер детали PAC1921
подробное описание детали  High-Side Current/Power Sensor
PDF  56 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PAC1921 датащи(HTML) 36 Page - Microchip Technology

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PAC1921 High-Side Current/Power Sensor Evaluation Board User’s Guide
DS50002376A-page 36
 2015 Microchip Technology Inc.
4.3.3
Calculations/File IO Tab
The Calculations/File IO tab, shown in Figure 4-15, displays register data (in decimal
by default). It also shows calculated results which were obtained by applying the data
sheet equations to the register data.
FIGURE 4-15:
Calculations/File IO Tab.
An example of using the equations to calculate power is as follows.
The value of one LSB in the VPOWER Result registers, in watts, can be calculated
according to Equation 4-1.
EQUATION 4-1:
LSB CALCULATION
1LSB
0.1V
R
DI_GAIN
----------------------------------------
32V
DV_GAIN
---------------------------
1023 2
6
--------------------------------------------------------------------------
=
Where:
1LSB
=
LSB value in watts for VPOWER Result Registers 1Dh and 1Eh
0.1V
=
Maximum VSENSE voltage
R=
Value of RSENSE resistor in ohms
DI_GAIN
=
Digital current gain
32V/DV_GAIN
=
Maximum voltage
1023
=
(210 – 1) = 10-bit FSR
26
=
Adjustment for 6 unused register bits when read as a 16-bit number



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