Single-Phase Power-Measurement

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Data and Control Registers

All transactions consist of the master writing to or read-

ing from data, configuration, or control registers. Each

register has an 8-bit address. There are several catego-

ries of internal registers; read-only registers return mea-

surement values taken by the device. All the read/write

registers are calculation coefficients set by the master.

The only exceptions are the DSPCFG register, which

configures operating features of the device, and the

ADC_AZ register, which resets the internal ADC when it

is written to.

READ WORD

S

ADDR:7

W

A

CMD:8

A

SR

ADDR:7

R

A

D0:8

A

D1:8

N

P

READ LONG

S

ADDR:7

W

A

CMD:8

A

SR

ADDR:7

R

A

D0:8

A

D1:8

A

D2:8

N

P

WRITE WORD

S

ADDR:7

W

A

CMD:8

A

D0:8

A

D1:8

A

P

READ WORD WITH PEC

S

ADDR:7

W

A

CMD:8

A

SR

ADDR:7

R

A

D0:8

A

D1:8

A

PEC:8

N

P

READ LONG WITH PEC

S

ADDR:7

W

A

CMD:8

A

SR

ADDR:7

R

A

D0:8

A

D1:8

A

D2:8

A

PEC:8

N

P

WRITE WORD WITH PEC

S

ADDR:7

W

A

CMD:8

A

D0:8

A

D1:8

A

PEC:8

A

P

A = ACKNOWLEDGE (ACK) BIT

ADDR:7 = 7-BIT DEVICE ADDRESS; MUST MATCH THE ADDRESS SELECTED BY A[2:0]

CMD:8 = REGISTER/COMMAND SELECTED IN TABLE 2

D0:8 = 8-BIT DATA; MULTIBYTE COMMANDS CAN REQUIRE D0, D1, D2, ETC.

PEC:8 = 8-BIT PEC DATA

N = NEGATIVE ACKNOWLEDGE (NACK) BIT

P = STOP BIT

S = START BIT

SR = REPEATED START BIT

W = WRITE BIT