71M6541DSLASHFSLASHG datasheet(131/166 Pages) MAXIM

131 / 166 page

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

Rev 5

131

5.3.8

CE Transfer Variables

When the MPU receives the XFER_BUSY interrupt, it knows that fresh data is available in the transfer

variables. CE transfer variables are modified during the CE code pass that ends with an XFER_BUSY

interrupt. They remain constant throughout each accumulation interval. In this data sheet, the names of

CE transfer variables always end with “_X”. The transfer variables can be categorized as:

•

Fundamental energy measurement variables

•

Instantaneous (RMS) values

•

Other measurement parameters

5.3.8.1 Fundamental Energy Measurement Variables

Table 85 and Table 86 describe each transfer variable for fundamental energy measurement. All

variables are signed 32-bit integers. Accumulated variables such as WSUM are internally scaled so they

have at least 2x margin before overflow when the integration time is one second. Additionally, the hardware

does not permit output values to fold back upon overflow.

Table 85: CE Transfer Variables (with Local Sensors)

Address

Name

Description

Configuration

0x84

†

WSUM_X

The signed sum: W0SUM_X+W1SUM_X. Not used

for EQU[2:0] = 0 (I/O RAM 0x2106[7:5]) and

EQU[2:0] = 1.

Figure 35 (page 93)

Figure 37 (page 95)

0x85

W0SUM_X

The sum of Wh samples from each wattmeter

element.

LSB = 9.4045*10

-13 * VMAX * IMAX Wh.

For ce41a04: LSB = 6.6952*10

-13 * VMAX * IMAX

Wh.

0x86

W1SUM_X

0x88

†

VARSUM_X

The signed sum: VAR0SUM_X+VAR1SUM_X. Not

used for EQU[2:0] = 0 and EQU[2:0] = 1.

0x89

VAR0SUM_X

The sum of VARh samples from each wattmeter

element.

LSB = 9.4045*10

-13 * VMAX * IMAX VARh.

For ce41a04, LSB = 6.6952*10

-13 * VMAX * IMAX

VARh.

0x8A

VAR1SUM_X

Note:

† 71M6542 only.

Table 86: CE Transfer Variables (with Remote Sensor)

Address

Name

Description

Configuration

0x84

†

WSUM_X

The signed sum: W0SUM_X+W1SUM_X. Not used

for EQU[2:0] = 0 (I/O RAM 0x2106[7:5]) and

EQU[2:0] = 1.

Figure 36 (page 94)

Figure 38 (page 96)

0x85

W0SUM_X

The sum of Wh samples from each wattmeter

element.

LSB = 1.55124*10

-12 * VMAX* IMAX Wh.

0x86

W1SUM_X

0x88

†

VARSUM_X

The signed sum: VAR0SUM_X+VAR1SUM_X. Not

used for EQU[2:0] = 0 and EQU[2:0] = 1.

0x89

VAR0SUM_X

The sum of VARh samples from each wattmeter

element.

LSB = 1.55124*10

-12 *VMAX* IMAX VARh.

0x8A

VAR1SUM_X

Note:

† 71M6542 only.

71M6541D/F/G Datasheet(PDF) 131 Page - Maxim Integrated Products

71M6541D/F/G Datasheet(HTML) 131 Page - Maxim Integrated Products

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL