71M6541DSLASHFSLASHG datasheet(16/166 Pages) MAXIM

16 / 166 page

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

Rev 5

Table 2. Required CE Code and Settings for 71M6x01 Isolated Sensor

I/O RAM

Mnemonic

I/O RAM

Location

71M6541D/F/G

(hex)

71M6542F/G

(hex)

FIR_LEN[1:0]

210C[2:1]

ADC_DIV

2200[5]

PLL_FAST

2200[4]

MUX_DIV[3:0]

2100[7:4]

MUX0_SEL[3:0]

2105[3:0]

MUX1_SEL[3:0]

2105[7:4]

MUX2_SEL[3:0]

2104[3:0]

MUX3_SEL[3:0]

2104[7:4]

RMT_E

2709[3]

DIFFA_E

210C[4]

DIFFB_E

210C[5]

EQU[2:0]

2106[7:5]

0 or 1

0, 1 or 2

CE Code

CE41B016201

CE41B016601

Equations

0, 1

0, 1 and 2

Current Sensor Type

1 Local Shunt

and

1 Remote Shunt

1 Local Shunt

and

1 Remote Shunt

Applicable Figure

Figure 3

Figure 5

Notes:

Although not used, set to 1 (the sample data is ignored by the CE)

71M654x with 71M6201 remote sensor (200 Amps)

71M654x with 71M6601 remote sensor (60 Amps)

MUX_DIV[3:0] must be set to 0 while writing the other RAM locations in this table.

Maxim updates the CE code periodically. Contact your local Maxim representative to obtain the

latest CE code and the associated settings. The configuration presented in this table is set by the

MPU demonstration code during initialization.

Using settings for the I/O RAM Mnemonics listed in Table 1 and Table 2 that do not match

those required by the corresponding CE code being used results in undesirable side effects

and must not be selected by the MPU. Consult your local Maxim representative to obtain the

correct CE code and AFE / MUX settings corresponding to the application.

For a basic single-phase application, the IAP-IAN current input is configured for differential mode,

whereas the VA pin is single-ended and is typically connected to the phase voltage via a resistor divider.

The IBP-IBN differential input may be optionally used to sense the Neutral current. This configuration

implies that the multiplexer applies a total of three inputs to the ADC. For this configuration, the

multiplexer sequence is as shown in Figure 6. In this configuration IAP-IAN, IBP-IBN and VA are

sampled, the extra conversion time slot (i.e., slot 2) is the optional Neutral current, and the physical

current sensor for the Neutral current measurement may be omitted if not required.

For a standard single-phase application with tamper sensor in the neutral path, two current inputs can be

configured for differential mode, using the pin pairs IAP-IAN and IBP-IBN. This means that the multiplexer

applies a total of three inputs to the ADC. In this application, the system design may use two locally

connected current sensors via IAP-IAN and IBP-IBN, as shown in Figure 2, and configured as differential

inputs. Alternately, the IAP-IAN pin pair is configured as a differential input and connected to a local current

shunt, and IBP-IBN is configured to connect to an isolated 71M6x01 isolated sensor (i.e., RMT_E = 1), as

shown in Figure 3. The VA pin is typically connected to the phase voltage via resistor dividers. For this

configuration, the multiplexer frame is also as shown in Figure 6 and time slot 2 is unused and ignored by

the CE, as the samples corresponding to the remote sensor (IBP-IBN) do not pass through the

multiplexer and are stored directly in CE RAM. The remote current sensor channel is sampled during the

second half of the multiplexer frame and its timing relationship to the VA voltage is precisely known so

that delay compensation can be properly applied.

The 71M6542F adds the ability to sample a second phase voltage (applied at the VB pin), which makes it

suitable for meters with two voltage and two current sensors, such as meters implementing Equation 2 for

dual-phase operation (P = VA*IA+VB*IB). Figure 7 shows the multiplexer sequence when four inputs are

71M6541D/F/G Datasheet(PDF) 16 Page - Maxim Integrated Products

71M6541D/F/G Datasheet(HTML) 16 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