71M6541DSLASHFSLASHG datasheet(23/166 Pages) MAXIM

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

Rev 5

Table 5. RCMD[4:0] Bits

Command

RCMD[4:2]

Phase Selector

RCMD[1:0]

Associated TMUXRn

Control Field

000

Invalid

---

001

Command 1

IBP-IBN

TMUXRB [2:0]

010

Command 2

011

Reserved

100

Reserved

101

Invalid

110

Reserved

111

Reserved

Notes:

Only two codes of RCMD[4:2] (SFR 0xFC[4:2]) are relevant for normal

operation. These are RCMD[4:2] = 001 and 010. Codes 000 and 101

are invalid and will be ignored if used. The remaining codes are

reserved and must not be used.

For the RCMD[1:0] control field, codes 01, 10 and 11 are valid and 00

is invalid and must not be used.

Table 6 shows the allowable combinations of values in RCMD[4:2] and TMUXRn[2:0], and the

corresponding data type and format sent back by the 71M6x01 isolated sensor and how the data is stored

in RMT_RD[15:8] and RMT_RD[7:0]. The MPU selects which of the three phases is read by asserting the

proper code in the RCMD[1:0] field, as shown in Table 5.

Table 6: Remote Interface Read Commands

RCMD[4:2]

TMUXRn[2:0]

Read Operation

RMT_RD [15:8]

RMT_RD [7:0]

001

00X

TRIMT[7:0]

(trim fuse for all 71M6x01)

TRIMT[7]=RMT_RD[8]

TRIMT[6:0]=RMT_RD[7:1]

010

00X

STEMP[10:0]

(sensed 71M6x01 temperature)

STEMP[10:8]=RMT_RD[10:8]

(RMT_RD[15:11] are sign extended)

STEMP[7:0]

010

01X

VSENSE[7:0]

(sensed 71M6x01 supply voltage)

All zeros

VSENSE[7:0]

010

10X

VERSION[7:0]

(chip version)

VERSION[7:0]

All zeros

Notes:

TRIMT[7:0] is the VREF trim value for all 71M6x01 devices. Note that the TRIMT[7:0] 8-bit value is formed

by RMT_RD[8] and RMT_RD[7:1]. See the 71M6xxx Data sheet for more information on TRIMT[7:0]

See the 71M6xxx Data Sheet for the equation to calculate temperature from the

STEMP[7:0] value read from

the 71M6x01.

See the 71M6xxx Data Sheet for the equation to calculate temperature from the

VSENSE[7:0] value read from

the 71M6x01.

With hardware and trim-related information on each connected 71M6x01 Isolated Sensor available to the

71M6541D/F/G, the MPU can implement temperature compensation of the energy measurement based on

the individual temperature characteristics of the 71M6x01 Isolated Sensor. See 4.7 Metrology

Temperature Compensation on page 97 for details.

Table 7 shows all I/O RAM registers used for control of the external 71M6x01 Isolated Sensors. See the

71M6xxx Data Sheet for additional details.

Table 7: I/O RAM Control Bits for Isolated Sensor

Name

Address

RST

Default

WAKE

Default

R/W Description

RCMD[4:0]

SFR

FC[4:0]

R/W

When the MPU writes a non-zero value to RCMD,

the 71M654x issues a command to the cor-

responding isolated sensor selected with

RCMD[1:0]. When the command is complete, the

71M654x clears RCMD[4:2]. The command code

71M6541D/F/G Datasheet(PDF) 23 Page - Maxim Integrated Products

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