71M6543F Datasheet, PDF (23/157 Pages) Maxim Integrated Products – Selectable Gain of 1 or 8 for One Current Energy Meter ICs Metrology Compensation

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71M6543F/H Data Sheet
Table 4. RCMD[4:0] Bits
Command
Phase Selector
Associated TMUXRn
RCMD[4:2]
RCMD[1:0]
Control Field
000
Invalid
00
Invalid
---
001 Command 1
01
IADC2-IADC3
TMUXR2[2:0]
010 Command 2
10
IADC4-IADC5
TMUXR4[2:0]
011
Reserved
11
IADC6-IADC7
TMUXR6[2:0]
100
Reserved
101
Invalid
110
Reserved
111
Reserved
Notes:
1. 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.
2. For the RCMD[1:0] control field, codes 01, 10 and 11 are valid and 00
is invalid and must not be used.
3. The specific phase (A, B or C) associated with each TMUXRn[2:0]
field, is determined by how the IADCn input pins are connected in the
meter design.
Table 5 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 71M6xx3 remote 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 4.
.
Table 5: Remote Interface Read Commands
RCMD[4:2] TMUXRn[2:0]
Read Operation
RMT_RD [15:8]
RMT_RD [7:0]
001
001
010
010
010
Notes:
00X
TRIMT[7:0]
(trim fuse for all 71M6xx3)
TRIMT[7]=RMT_RD[8]
TRIMT[6:0]=RMT_RD[7:1]
TRIMBGB[7:0] and
11X
TRIMBGD[7:0]
(additional trim fuses for
71M6113 and 71M6203 only)
TRIMBGB[7:0]
TRIMBGD[7:0]
00X
STEMP[10:0]
(sensed 71M6xx3 temperature)
STEMP[10:8]=RMT_RD[10:8]
(RMT_RD[15:11] are sign extended)
STEMP[7:0]
01X
VSENSE[7:0]
(sensed 71M6xx3 supply voltage)
All zeros
VSENSE[7:0]
10X
VERSION[7:0]
(chip version)
VERSION[7:0]
All zeros
1. TRIMT[7:0] is the VREF trim value for all 71M6xx3 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 the equations related to TRIMT[7:0]
and the corresponding temperature coefficient.
2. TRIMBGB[7:0] and TRIMBGD[7:0] are trim values used for characterizing the 71M6113 (0.5%) and 71M6203
(0.1%) over temperature. See the 71M6xxx Data sheet for the equations related to TRIMBGB[7:0] and
TRIMBGD[7:0] and the corresponding temperature coefficients.
3. See 2.5.6 71M6xx3 Temperature Sensor on page 56.
4. See 2.5.8 71M6xx3 VCC Monitor on page 57.
With hardware and trim-related information on each connected 71M6xx3 Isolated Sensor available to the
71M6543, the MPU can implement temperature compensation of the energy measurement based on the
individual temperature characteristics of the 71M6xx3 Isolated Sensors. See 4.5 Metrology Temperature
Compensation for details.
Table 6 shows all I/O RAM registers used for control of the external 71M6xx3 Isolated Sensors. See the
71M6xx3 Data Sheet for additional details.
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