9DML2855 datasheet(13/19 Pages) RENESAS

13 / 19 page

March 16, 2020

9DML2855 Datasheet

General SMBus Serial Interface Information

How to Write

▪ Controller (host) sends a start bit

▪ Controller (host) sends the write address

▪ Renesas clock will acknowledge

▪ Controller (host) sends the beginning byte location = N

▪ Renesas clock will acknowledge

▪ Controller (host) sends the byte count = X

▪ Renesas clock will acknowledge

▪ Controller (host) starts sending Byte N through Byte N+X-1

▪ Renesas clock will acknowledge each byte one at a time

▪ Controller (host) sends a stop bit

How to Read

▪ Controller (host) will send a start bit

▪ Controller (host) sends the write address

▪ Renesas clock will acknowledge

▪ Controller (host) sends the beginning byte location = N

▪ Renesas clock will acknowledge

▪ Controller (host) will send a separate start bit

▪ Controller (host) sends the read address

▪ Renesas clock will acknowledge

▪ Renesas clock will send the data byte count = X

▪ Renesas clock sends Byte N+X-1

▪ Renesas clock sends Byte 0–Byte X (if X(H) was written to

Byte 8)

▪ Controller (host) will need to acknowledge each byte

▪ Controller (host) will send a not acknowledge bit

▪ Controller (host) will send a stop bit

Index Block Write Operation

Controller (Host)

Renesas (Slave/Receiver)

starT bit

Slave Address

WRite

ACK

Beginning Byte = N

ACK

Data Byte Count = X

ACK

Beginning Byte N

ACK

Byte N + X - 1

ACK

PstoP bit

Index Block Read Operation

Controller (Host)

Renesas (Slave/Receiver)

TstarT bit

Slave Address

WRite

ACK

Beginning Byte = N

ACK

Repeat starT

Slave Address

ReaD

ACK

Data Byte Count = X

ACK

Beginning Byte N

ACK

Byte N + X - 1

Not acknowledge

PstoP bit

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