9SQL4954 datasheet(18/30 Pages) RENESAS

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February 19, 2020

9SQL4952/9SQL4954/9SQL4958 Datasheet

General SMBus Serial Interface Information

How to Write

▪ Controller (host) sends a start bit

▪ Controller (host) sends the write address

▪ IDT clock will acknowledge

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

▪ IDT clock will acknowledge

▪ Controller (host) sends the byte count = X

▪ IDT clock will acknowledge

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

▪ IDT clock will acknowledge each byte one at a time

▪ Controller (host) sends a stop bit

Note: Address is latched on SADR pin.

How to Read

▪ Controller (host) will send a start bit

▪ Controller (host) sends the write address

▪ IDT clock will acknowledge

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

▪ IDT clock will acknowledge

▪ Controller (host) will send a separate start bit

▪ Controller (host) sends the read address

▪ IDT clock will acknowledge

▪ IDT clock will send the data byte count = X

▪ IDT clock sends Byte N+X-1

▪ IDT clock sends Byte 0 through 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)

IDT (Slave/Receiver)

TstarT 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)

IDT (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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