71M6541DSLASHFSLASHG datasheet(132/166 Pages) MAXIM

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71M6541D/F/G and 71M6542F/G Data Sheet

132

Rev 5

WSUM_X (CE RAM 0x84) and VARSUM_X (CE RAM 0x88) are the signed sum of Phase-A and Phase-B Wh

or VARh values according to the metering equation specified in the I/O RAM control field EQU[2:0] (I/O

RAM 0x2106[7:5]). WxSUM_X (x = 0 or 1, CE RAM 0x85 and 0x86) is the Wh value accumulated for phase x

in the last accumulation interval and can be computed based on the specified LSB value.

5.3.8.2 Instantaneous Energy Measurement Variables

IxSQSUM_X and VxSQSUM (see Table 87) are the sum of the squared current and voltage samples

acquired during the last accumulation interval.

Table 87: CE Energy Measurement Variables (with Local Sensors)

Address

Name

Description

Configuration

0x8C

I0SQSUM_X

The sum of squared current samples from each

element.

LSB = 9.4045*10

-13 IMAX2 A2h

For ce41a04, LSB = 6.6952*10

-13 IMAX2 A2h.

When EQU = 1, I0SQSUM_X is based on IA and

IB.

Figure 35 (page 93)

Figure 37 (page 95)

0x8D

I1SQSUM_X

0x90

V0SQSUM_X

The sum of squared voltage samples from each

element.

LSB = 9.4045*10

-13 VMAX2 V2h

For ce41a04, LSB = 6.6952*10^

-13 VMAX2 V2h.

0x91

†

V1SQSUM_X

† 71M6542 only.

Table 88: CE Energy Measurement Variables (with Remote Sensor)

Address

Name

Description

Configuration

0x8C

I0SQSUM_X

The sum of squared current samples from each

element.

LSBI = 2.55872*10

-12 * IMAX2 A2h

When EQU = 1, I0SQSUM_X is based on IA and

IB.

Figure 36 (page 94)

Figure 38 (page 96)

0x8D

I1SQSUM_X

0x90

V0SQSUM_X

The sum of squared voltage samples from each

element.

LSBV= 9.40448*10

-13 * VMAX2 V2h

0x91

†

V1SQSUM_X

† 71M6542 only.

The RMS values can be computed by the MPU from the squared current and voltage samples as follows:

Note: NACC = SUM_SAMPS[12:0] (CE RAM 0x23).

Other Transfer variables include those available for frequency and phase measurement, and those

reflecting the count of the zero-crossings of the mains voltage and the battery voltage. These transfer

variables are listed in Table 89.

MAINEDGE_X (CE RAM 0x83) reflects the number of half-cycles accounted for in the last accumulated

interval for the AC signal of the phase specified in the FREQSEL[1:0] field in CECONFIG (CE RAM 0x20[7:6]).

MAINEDGE_X is useful for implementing a real-time clock based on the input AC signal.

ACC

RMS

LSB

IxSQSUM

⋅

3600

ACC

RMS

LSB

VxSQSUM

⋅

3600

71M6541D/F/G Datasheet(PDF) 132 Page - Maxim Integrated Products

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