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 2005 Semtech Corp.

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POWER MANAGEMENT

SC900

Applications Information (Cont.)

Stop Separated Reads

Another read format is available which is, in effect, an extension of the combined format read. This format allows

a master to set up the register address pointer for a read and return to that slave some time later to read the data.

it is being addressed, and the master responds with the 8-bit register address. The master then sends a stop or

restart condition, and may address another slave. Some time later the master sends a start or restart condition,

register address location that had previously been set up.

Slave Address

I2C Stop Separated Format - Read

Register Address

S

S : Start Condition

W: Write = '0'

R : Read = '1'

A : Acknowledge (sent by slave)

B : Acknowledge (sent by master)

Sr: Repeated Start Condition

P : Stop Condition

Slave Address : 7 bit

Register Address : 8 bit

Data : 8 Bit

AW

A

A

S

Slave Address B

P

Slave Address

Data

S/

Sr

AR

A

B P

Register Address Setup Access

Register Read Access

Master Addresses

other Slaves