参数资料
型号: ARD00280
厂商: Microchip Technology
文件页数: 27/50页
文件大小: 0K
描述: KIT REF DESIGN PIC18F87J72 1PH
设计资源: PIC18F87J72 BOM
PIC18F87J72 Schematics
PIC18F87J72 Gerber Files
标准包装: 1
主要目的: 电源管理,电度表/功率表
嵌入式: 是,MCU,8 位
已用 IC / 零件: PIC18F87J72
主要属性: 单相分流电度表
已供物品:
Calculation Engine and Register Description
3.19
POWER_REACT
Name
POWER_REACT
Bits
32
Cof
R
This is the value for reactive power. The goal is to get this value to equal X VAR/LSB.
This is done with the GAIN_POWER_REACT register. When displaying the power,
multiply the (decimal) value in this register by X to get the display value in Watts. This
register is overwritten every LINE_CYC line cycle (written only once if the calibration is
enabled).
3.20
PERIOD
Name
PERIOD
Bits
32
Cof
R
This 32-bit register represents the total number of clock ticks that elapsed over the most
recent LINE_CYC line cycle. Each LSB represents 1.6 μs with a 40 MHz clock on the
microcontroller. This register is overwritten every LINE_CYC line cycle (written only
once if the calibration is enabled).
3.21
ENERGY_ACT
Name
ENERGY_ACT
RAW_ENERGY_ACT
Bits
32
64
Cof
R
R
The design updates the Energy register using the CF Pulse blink output count. In this
method, the Energy registers increments every pulse by a value equal to
1/(METER_CONSTANT).
ENERGY_W = ENEGRY_W + (1/METER_CONSTANT)
The gain calibration registers GAIN_NUMR_ENERGY_ACT and
GAIN_DENR_ENERGY_ACT hold good for this method also.
3.22
ENERGY_APP
Name
ENERGY_APP
RAW_ENERGY_APP
Bits
32
64
Cof
R
R
These two registers represent the total apparent energy accumulated so far.
? 2011 Microchip Technology Inc.
DS51931A-page 27
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