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AS8218 데이터시트(PDF) 121 Page - ams AG

부품명 AS8218
상세설명  Highly Integrated Single Phase 2 Current Energy Metering Integrated Circuits
PDF  123 Pages
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제조업체  AMSCO [ams AG]
홈페이지  http://www.ams.com
Logo AMSCO - ams AG

AS8218 데이터시트(HTML) 121 Page - ams AG

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Data Sheet AS8218 / AS8228
Revision 3.0, 31-May-06
Page 121 of 123
)
mconst
(
Rate
Pulse
LED
)
ref
(
PR
Ni
=
Where PR(ref) is the reference meter constant.
LED Meter Constant (non-standard):
The LED pulses are derived directly from the fast internal pulses (204,800i/kWh) and is specified using the
parameter ‘mconst’ of SREG. If the target meter constant is different from one of the selectable (mconst) meter
constants, the following formula applies:
)
Na
Ni
lev
_
Pulse
Ideal
(
×
Where Ni is calculated using the Target Pulse Rate:
Rate
Pulse
et
arg
T
t
tan
Cons
Meter
ference
Re
Ni
=
NB: For mconst, select a pulse rate close to Target Pulse Rate, so that the Pulse_lev stays within reasonable
limits.
14.
Terminology
AFE
-
Analog front end
CT
-
Current transformer
DSP
-
Digital signal processor
EEPROM
-
Electrically erasable programmable read only memory
I_RAM
-
8051 internal memory
kB
-
kilobyte
LBPx
-
LCD back-plane driver pin
LCD
-
Liquid crystal display
LCDD
-
Liquid crystal display driver
LED
-
Light-emitting diode
LP_DIV
-
Low power divider
LP_OSC
-
Low power oscillator
LSB
-
Least significant bit
LSDx
-
LCD segment driver pin
MCU
-
Microcontroller unit
MDR
-
Meter data register (in DSP block)
MPIO
-
Programmable multi-purpose input/output
MSB
-
Most significant bit
P_ACCU
-
Power accumulator for real power
PF
-
Power factor
PLP
-
Power low pass filter
P_RAM
-
Program memory
PSM
-
Power-supply monitor



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