AK9720 Datasheet, PDF (23/31 Pages) Asahi Kasei Microsystems – IR Sensor Module with I2C I/F

[AK9720]
1.3 Acknowledge
The device transmitting data will release the SDA line after transmitting one byte of data
(SDA line state is “High”). The device receiving data will pull the SDA line to “Low” during
the next clock. This operation is called “Acknowledge”. The Acknowledge signal can be
used to indicate successful data transfers.
The AK9720 will output an acknowledge signal after receiving a Start condition and the
Slave address.
The AK9720 will output an acknowledge signal after receiving each byte, when the
WRITE instruction is transmitted.
The AK9720 will transmit the data stored in the selected address after outputting an
acknowledge signal, when a READ instruction is transmitted. Then the AK9720 will monitor
the SDA line after releasing the SDA line. If the master device generates an Acknowledge
instead of a Stop condition, the AK9720 transmits an 8-bit data stored in the next address.
When the Acknowledge is not generated, transmitting data is terminated.
SCL of Master
Device
1
Clocl pulse for
Acknowledge
8
9
Data Output of
Transmitter
Data Output of
Receiver
Start Condition
Fig.3. Acknowledge
Non-Acknowledge
Acknowledge
Rev.02
AKM Confidential
- 23 -
2012/11