AK7735EQ Datasheet, PDF (86/142 Pages) Asahi Kasei Microsystems – Dual DSP with 4chADC + 4chDAC + 4chSRC

[AK7735]
1-3. Repeated Start Condition
When a Start condition is received again instead of a Stop condition, the bus changes to a Repeated
Start condition. A Repeated Start condition is functionally the same as a Start condition.
SCL
SDA
START CONDITION
Repeated Start CONDITION
Figure 63. Repeated Start Condition (I²C)
1-4. Acknowledge
The IC device that sends data releases the SDA line (“H”) after sending one byte of data. The IC device
that receives data then sets the SDA line to “L” at the next clock. This operation is called
“acknowledgement”, and it enables verification that the data transfer has been properly executed.
The AK7735 generates an acknowledgement upon receipt of a Start condition and a Slave address. For
a write instruction, an acknowledgement is generated whenever receipt of each byte is completed. For a
read instruction, succeeded by generation of an acknowledgement, the AK7735 releases the SDA line
after outputting data at the designated address, and it monitors the SDA line condition. When the Master
side generates an acknowledgement without sending a Stop condition, the AK7735 outputs data at the
next address location. When no acknowledgement is generated, the AK7735 ends data output (not
acknowledged).
Clock pulse
for acknowledge
SCL FROM
MASTER
1
8
9
DATA
OUTPUT BY
TRANSMITTER
DATA
OUTPUT BY
RECEIVER
START
CONDITION
not acknowledge
acknowledge
Figure 64. Generation of Acknowledgement (I²C)
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