ADE7758 Analog Devices, ADE7758 Datasheet - Page 58

• Manufacturer Part Number: ADE7758
• Description: Poly Phase Multifunction Energy Metering IC with Per Phase Information
• Manufacturer: Analog Devices

ADE7758
ACCESSING THE ADE7758 ON-CHIP REGISTERS
All ADE7758 functionality is accessed via the on-chip registers.
Each register is accessed by first writing to the communications
register and then transferring the register data. For a full
description of the serial interface protocol, see the ADE7758
Serial Interface section.
Table 12. Communications Register
Bit Location
0 to 6
7
Table 13. ADE7758 Register List
Address
[A6:A0]
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
0x0A
0x0B
0x0C
0x0D
0x0E
Name
Reserved
AWATTHR
BWATTHR
CWATTHR
AVARHR
BVARHR
CVARHR
AVAHR
BVAHR
CVAHR
AIRMS
BIRMS
CIRMS
AVRMS
BVRMS
Bit Mnemonic
A0 to A6
W/R
R/W
–
R
R
R
R
R
R
R
R
R
R
R
R
R
R
1
Description
The seven LSBs of the communications register specify the register for the data transfer operation.
Table 13 lists the address of each ADE7758 on-chip register.
When this bit is a Logic 1, the data transfer operation immediately following the write to the
communications register is interpreted as a write to the ADE7758. When this bit is a Logic 0, the data
transfer operation immediately following the write to the communications register is interpreted as a
read operation.
Length
16
16
16
16
16
16
16
16
16
24
24
24
24
24
DB7
W/R
Default
Value
0
0
0
0
0
0
0
0
0
0
0
0
0
0
DB6
A6
DB5
A5
Description
Reserved.
Watt-Hour Accumulation Register for Phase A. Active power is accumulated over
time in this read-only register. The AWATTHR register can hold a maximum of
0.52 seconds of active energy information with full-scale analog inputs before it
overflows (see the Active Energy Calculation section). Bit 0 and Bit 1 of the
COMPMODE register determine how the active energy is processed from the six
analog inputs.
Watt-Hour Accumulation Register for Phase B.
Watt-Hour Accumulation Register for Phase C.
VAR-Hour Accumulation Register for Phase A. Reactive power is accumulated
over time in this read-only register. The AVARHR register can hold a maximum of
0.52 seconds of reactive energy information with full-scale analog inputs before
it overflows (see the Reactive Energy Calculation section). Bit 0 and Bit 1 of the
COMPMODE register determine how the reactive energy is processed from the
six analog inputs.
VAR-Hour Accumulation Register for Phase B.
VAR-Hour Accumulation Register for Phase C.
VA-Hour Accumulation Register for Phase A. Apparent power is accumulated
over time in this read-only register. The AVAHR register can hold a maximum of
1.15 seconds of apparent energy information with full-scale analog inputs before
it overflows (see the Apparent Energy Calculation section). Bit 0 and Bit 1 of the
COMPMODE register determine how the apparent energy is processed from the
six analog inputs.
VA-Hour Accumulation Register for Phase B.
VA-Hour Accumulation Register for Phase C.
Phase A Current Channel RMS Register. The register contains the rms component
of the Phase A input of the current channel. The source is selected by data bits in
the mode register.
Phase B Current Channel RMS Register.
Phase C Current Channel RMS Register.
Phase A Voltage Channel RMS Register.
Phase B Voltage Channel RMS Register.
Rev. A | Page 58 of 68
DB4
A4
DB3
A3
COMMUNICATIONS REGISTER
The communications register is an 8-bit, write-only register that
controls the serial data transfer between the ADE7758 and the
host processor. All data transfer operations must begin with a
write to the communications register. The data written to the
communications register determines whether the next operation
is a read or a write and which register is being accessed. Table 12
outlines the bit designations for the communications register.
DB2
A2
DB1
A1
DB0
A0