71M6541D Datasheet, PDF (113/166 Pages) Maxim Integrated Products – 0.1% Accuracy Over 2000:1 Current Range Energy Meter ICs

Name
DIO_PV
DIO_PW
DIO_PX
DIO_PY
EEDATA[7:0]
EECTRL[7:0]
EQU[2:0]
Location
2457[6]
2457[7]
2458[7]
2458[6]
SFR 9E
SFR 9F
2106[7:5]
71M6541D/F/G and 71M6542F/G Data Sheet
Rst Wk Dir Description
0 – R/W Causes VARPULSE to be output on pin SEGDIO1, if LCD_MAP[1] = 0.
0 – R/W Causes WPULSE to be output on pin SEGDIO0, if LCD_MAP[0] = 0.
0 – R/W Causes XPULSE to be output on pin SEGDIO6 , if LCD_MAP[6] = 0.
0 – R/W Causes YPULSE to be output on pin SEGDIO7 , if LCD_MAP[7] = 0.
0 0 R/W Serial EEPROM interface data.
Serial EEPROM interface control.
Status
Bit
Name
Read/
Write
Reset
State
Polarity Description
0 0 R/W
7 ERROR
R
6 BUSY
R
5 RX_ACK R
0
Positive
1 when an illegal command
is received.
0 Positive 1 when serial data bus is
busy.
1
Positive
1 indicates that the
EEPROM sent an ACK bit.
Specifies the power equation.
EQU
Watt & VAR Formula
(WSUM/VARSUM)
Inputs Used for Energy/Current
Calculation
W0SUM/ W1SUM/ I0SQ I1SQ
VAR0SUM VAR1SUM SUM SUM
0 0 R/W
0 ^VA*IA
1 element, 2W 1φ
VA*(IA-IB)/2
1 _{1 element, 3W 1φ}
VA*IA
VA*IB¹
VA*(IA-IB)/2
–
IA
IB¹
IA-IB IB
2^{† VA*IA + VB*IB}
2 element, 3W 3φ Delta
VA*IA
VB*IB
IA IB
Note:
1. Optionally, IB may be used to measure neutral current.
† _{71M6542F/G only}