71M6542F MAXIM [Maxim Integrated Products], 71M6542F Datasheet - Page 113
71M6542F
Manufacturer Part Number
71M6542F
Description
0.1% Accuracy Over 2000:1 Current Range Energy Meter ICs
Manufacturer
MAXIM [Maxim Integrated Products]
Datasheet
1.71M6542F.pdf
(166 pages)
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Name
DIO_PV
DIO_PW
DIO_PX
DIO_PY
EEDATA[7:0]
EECTRL[7:0]
EQU[2:0]
Location
2106[7:5]
SFR 9E
SFR 9F
2457[6]
2457[7]
2458[7]
2458[6]
Rst Wk Dir
0
0
0
0
0
0
0
–
–
–
–
0
0
0
R/W Causes VARPULSE to be output on pin SEGDIO1, if LCD_MAP[1] = 0.
R/W Causes WPULSE to be output on pin SEGDIO0, if LCD_MAP[0] = 0.
R/W Causes XPULSE to be output on pin SEGDIO6 , if LCD_MAP[6] = 0.
R/W Causes YPULSE to be output on pin SEGDIO7 , if LCD_MAP[7] = 0.
R/W Serial EEPROM interface data.
R/W
R/W
Description
Serial EEPROM interface control.
Specifies the power equation.
†
Status
EQU
Note:
71M6542F/G only
2
0
1
Bit
†
7
6
5
1. Optionally, IB may be used to measure neutral current.
VA*IA
1 element, 2W 1φ
VA*(IA-IB)/2
1 element, 3W 1φ
VA*IA + VB*IB
2 element, 3W 3φ Delta
Watt & VAR Formula
ERROR
BUSY
RX_ACK
(WSUM/VARSUM)
Name
Read/
Write
R
R
R
Reset
State
0
0
1
71M6541D/F/G and 71M6542F/G Data Sheet
VA*(IA-IB)/2
VAR0SUM
W0SUM/
VA*IA
VA*IA
Polarity Description
Positive
Positive 1 when serial data bus is
Positive
Inputs Used for Energy/Current
1 when an illegal command
is received.
busy.
1 indicates that the
EEPROM sent an ACK bit.
Calculation
VAR1SUM
W1SUM/
VA*IB
VB*IB
–
1
I0SQ
SUM
IA-IB
IA
IA
I1SQ
SUM
IB
IB
IB
1
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