ADE7953 datasheet(54/68 Pages) AD

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ADE7953

Data Sheet

Rev. A | Page 54 of 68

I2C Read Operations

The I2C read operation is performed in two stages. The first

stage sets the pointer to the address of the register to be

accessed. The second stage reads the contents of the register.

As shown in Figure 71, the first stage is initiated when the

master issues a start condition, which consists of the slave

address and the read/write bit. Because this first step sets up the

pointer to the address, the LSB of the start byte should be set to

0 (write). The start condition is followed by the 16-bit address

of the target register. After each byte is received, the ADE7953

issues an acknowledge (ACK) to the master.

The second stage of the read operation begins with the master

generating a new start condition. This start condition consists of

the same slave address but with the LSB set to 1 to signify that a

read is being issued. After this byte is received, the ADE7953

issues an acknowledge (ACK). The ADE7953 then sends the

of each byte. All bytes are sent MSB first. The register contents

can be 8, 16, 24, or 32 bits long. After the final byte of register

data is received, the master issues a stop condition in place of

the acknowledge to indicate the completion of the communication.

The I2C read operation is shown in Figure 71.

ACK GENERATED BY

ADE7953

ACK GENERATED BY

MASTER

SLAVE ADDRESS

MSB OF REGISTER ADDRESS

LSB OF REGISTER ADDRESS

100

SLAVE ADDRESS

BYTE 3 (MSB)

OF REGISTER

BYTE 2 OF REGISTER

BYTE 1 OF REGISTER

BYTE 0 (LSB)

OF REGISTER

ACK GENERATED BY

ADE7953

Figure 71. I2C Read

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