SC905AEVB View Datasheet(PDF) - Semtech Corporation

Part Name

Description

MFG CO.

SC905AEVB

CDMA Cellular Phone Power Management IC

Semtech Corporation 

SC905A

POWER MANAGEMENT

Using the I2C Serial Port (Cont.)

Stop-Separated Reads

Stop-separated reads can also be used. This format allows a master to set up the register address pointer for a read

and return to that slave at a later time to read the data. In this format the slave address followed by a write command

are sent after a start [S] condition. The SC905A then acknowledges it is being addressed, and the master responds

with the 8-bit register address. The master sends a stop or restart condition and may then address another slave. After

performing other tasks, the master can send a start or restart condition to the SC905A with a read command. The

SC905A acknowledges this request and returns the data from the register location that had previously been set up.

I2C Stop Separated Format- Read

Register Address Setup Access

Master Addresses

other Slaves

S Slave Address W A Register Address A P S Slave Address B

Register Read Access

S/Sr Slave Address A R A Data

NACK P

S: Start Condition

W: Write = ‘0’

R: Read = ‘1’

A: Acknowledge (sent by slave)

NACK: Non-Acknowledge (sent by master)

Sr: Repeated Start Condition

P: Stop condition

Slave Address: 7-bit

Register Address: 8-bit

Data: 8-bit

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