SC900A View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'SC900A' PDF : 23 Pages View PDF
SC900A
POWER MANAGEMENT
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.
After the start condition [S], the slave address is sent, followed by a write. The SC900A I2C then acknowledges that
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, and
a valid slave address is sent, followed by a read. The SC900A I2C then acknowledges and returns the data at thee
register address 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
S: Start Condition
Slave Address: 7 bit
W: Write = ‘0’
Register Address: 8 bit
R: Read = ‘1’
Data: 8 bit
A: Acknowledge (sent by slave)
NACK: Non-Acknowledge (sent by master)
Sr: Repeated Start Condition
P: Stop condition
Register Read Access
S/Sr Slave Address A R A Data
NACK P
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