sc900imltrt Semtech Corporation, sc900imltrt Datasheet - Page 15

• Manufacturer Part Number: sc900imltrt
• Description: Sc900 Programmable Penta Uldo With Reset And I2c Interface
• Manufacturer: Semtech Corporation

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 SC900 I
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 SC900 I
register address location that had previously been set up.
POWER MANAGEMENT
Applications Information (Cont.)
2005 Semtech Corp.
I2C Stop Separated Format - Read
S
I
2
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
C Stop
Slave Address
Register Address Setup Access
AW
A
Slave Address : 7 bit
Register Address : 8 bit
Data : 8 Bit
Register Address
A
P
S
Master Addresses
Slave Address B
other Slaves
15
2
S/
Sr
C then acknowledges and returns the data at the
Slave Address
Register Read Access
AR
A
2
C then acknowledges that
Data
B P
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SC900